Relevant bibliographies by topics / Soil Moisture Retention Curve

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Academic literature on the topic 'Soil Moisture Retention Curve'

Author: Grafiati
Published: 7 June 2025
Last updated: 26 June 2025

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Journal articles on the topic "Soil Moisture Retention Curve"

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Silva, Luana da, Jackson Adriano Albuquerque, Letícia Sequinatto, and Diego Bortolini. "Adjusting the water retention curve for retractable soils." DYNA 88, no. 218 (2021): 136–42. http://dx.doi.org/10.15446/dyna.v88n218.89499.

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The soil water retention curve (SWRC) relates moisture to soil water retention energy (matrix potential). The calculation of the volumetrichumidity considers the sample volume. In retractable soils, this volume varies according to the drying or wetting of the soil, which can result in errors in the calculated moisture. The objective of this study is to quantify the volume variation in retractable soils and to elaborate the SWRC via the traditional method, which does not consider soil retraction, and a second method, called adjusted, that considers thephenomenon of soil retraction. Soil samples have been collected in horizons A and B from six soil profiles Thus, for retractable soils, it isrecommended that the adjustment of the SWRC be carried out considering the actual volume of the soil (retracted), which varies for each matrix potential applied. This adjustment reduces errors, mainly in determining the permanent wilt point and available water.
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Anderson, M. G., S. Howes, P. E. Kneale, and J. M. Shen. "On Soil Retention Curves and Hydrological Forecasting in Ungauged Catchments." Hydrology Research 16, no. 1 (1985): 11–32. http://dx.doi.org/10.2166/nh.1985.0002.

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In many physically based hydrological models, there is the requirement to specify the suction-moisture curve of the soil system. This paper shows that where the suction moisture curve is known, then a model can be derived to predict groundwater rise. Secondly, it is shown that with only mapped soils data, relationships exist that allow suction-moisture curves to be predicted. This prediction scheme is incorporated into a forecasting model for ungauged catchments and results are presented to show the potential validity of the scheme for operational forecasting.
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Madi, Raneem, Gerrit Huibert de Rooij, Henrike Mielenz, and Juliane Mai. "Parametric soil water retention models: a critical evaluation of expressions for the full moisture range." Hydrology and Earth System Sciences 22, no. 2 (2018): 1193–219. http://dx.doi.org/10.5194/hess-22-1193-2018.

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Abstract. Few parametric expressions for the soil water retention curve are suitable for dry conditions. Furthermore, expressions for the soil hydraulic conductivity curves associated with parametric retention functions can behave unrealistically near saturation. We developed a general criterion for water retention parameterizations that ensures physically plausible conductivity curves. Only 3 of the 18 tested parameterizations met this criterion without restrictions on the parameters of a popular conductivity curve parameterization. A fourth required one parameter to be fixed. We estimated parameters by shuffled complex evolution (SCE) with the objective function tailored to various observation methods used to obtain retention curve data. We fitted the four parameterizations with physically plausible conductivities as well as the most widely used parameterization. The performance of the resulting 12 combinations of retention and conductivity curves was assessed in a numerical study with 751 days of semiarid atmospheric forcing applied to unvegetated, uniform, 1 m freely draining columns for four textures. Choosing different parameterizations had a minor effect on evaporation, but cumulative bottom fluxes varied by up to an order of magnitude between them. This highlights the need for a careful selection of the soil hydraulic parameterization that ideally does not only rely on goodness of fit to static soil water retention data but also on hydraulic conductivity measurements. Parameter fits for 21 soils showed that extrapolations into the dry range of the retention curve often became physically more realistic when the parameterization had a logarithmic dry branch, particularly in fine-textured soils where high residual water contents would otherwise be fitted.
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Scott, Bethany L., Tyson E. Ochsner, Bradley G. Illston, Christopher A. Fiebrich, Jeffery B. Basara, and Albert J. Sutherland. "New Soil Property Database Improves Oklahoma Mesonet Soil Moisture Estimates*." Journal of Atmospheric and Oceanic Technology 30, no. 11 (2013): 2585–95. http://dx.doi.org/10.1175/jtech-d-13-00084.1.

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Abstract Soil moisture data from the Oklahoma Mesonet are widely used in research efforts spanning many disciplines within Earth sciences. These soil moisture estimates are derived by translating measurements of matric potential into volumetric water content through site- and depth-specific water retention curves. The objective of this research was to increase the accuracy of the Oklahoma Mesonet soil moisture data through improved estimates of the water retention curve parameters. A comprehensive field sampling and laboratory measurement effort was conducted that resulted in new measurements of the percent of sand, silt, and clay; bulk density; and volumetric water content at −33 and −1500 kPa. These inputs were provided to the Rosetta pedotransfer function, and parameters for the water retention curve and hydraulic conductivity functions were obtained. The resulting soil property database, MesoSoil, includes 13 soil physical properties for 545 individual soil layers across 117 Oklahoma Mesonet sites. The root-mean-square difference (RMSD) between the resulting soil moisture estimates and those obtained by direct sampling was reduced from 0.078 to 0.053 cm3 cm−3 by use of the new water retention curve parameters, a 32% improvement. A >0.15 cm3 cm−3 high bias on the dry end was also largely eliminated by using the new parameters. Reanalysis of prior studies that used Oklahoma Mesonet soil moisture data may be warranted given these improvements. No other large-scale soil moisture monitoring network has a comparable published soil property database or has undergone such comprehensive in situ validation.
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Almeida, Eurileny Lucas de, Adunias dos Santos Teixeira, Francisco Chagas da Silva Filho, Raimundo Nonato de Assis Júnior, and Raimundo Alípio de Oliveira Leão. "Filter Paper Method for the Determination of the Soil Water Retention Curve." Revista Brasileira de Ciência do Solo 39, no. 5 (2015): 1344–52. http://dx.doi.org/10.1590/01000683rbcs20140546.

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ABSTRACT High cost and long time required to determine a retention curve by the conventional methods of the Richards Chamber and Haines Funnel limit its use; therefore, alternative methods to facilitate this routine are needed. The filter paper method to determine the soil water retention curve was evaluated and compared to the conventional method. Undisturbed samples were collected from five different soils. Using a Haines Funnel and Richards Chamber, moisture content was obtained for tensions of 2; 4; 6; 8; 10; 33; 100; 300; 700; and 1,500 kPa. In the filter paper test, the soil matric potential was obtained from the filter-paper calibration equation, and the moisture subsequently determined based on the gravimetric difference. The van Genuchten model was fitted to the observed data of soil matric potential versus moisture. Moisture values of the conventional and the filter paper methods, estimated by the van Genuchten model, were compared. The filter paper method, with R2 of 0.99, can be used to determine water retention curves of agricultural soils as an alternative to the conventional method.
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Renato Américo de Araújo Neto, Ivomberg Douardo Magalhães, Guilherme Bastos Lyra, Stoecio Malta Ferreira Maia, and Gustavo Bastos Lyra. "Physical and hydrological characteristics and modelling of the soil water retention curve in the brazilian semi-arid region." Bioscience Journal 38 (May 24, 2022): e38031. http://dx.doi.org/10.14393/bj-v38n0a2022-54195.

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Semiarid regions are characterised by water scarcity, a limiting factor on plant growth and development. The Sertão Canal was built in the semiarid region of Brazil, more specifically in the state of Alagoas, with the aim of making year-round irrigation possible. However, for the best water management, a physical and hydrological knowledge of the soils is necessary. As such, the aim of this study was to determine the physical and hydrological characteristics of three different types of soil (Argisol, Quartzarenic Neossol and Regolithic Neossol) under native vegetation (Caatinga) and agricultural systems in the semiarid region of Alagoas, as well as to adjust the soil water retention characteristic curves. Soil samples were collected at depths of 0-10, 10-20 and 20-30 cm in the municipalities of Inhapi, Delmiro Gouveia and Pariconha, in the state of Alagoas. The points of the moisture characteristic curve were determined by the Richards method, at pressures of 33, 100, 500, 1000 and 1500 kPa. Retention curves were modelled using the exponential decay equation and compared using the van Genuchten equation, modelled with the help of the RETC computer software. Particle size varied according to the textural classification of the different soils, from Sand to a Sandy Clay Loam. The retention curve fluctuated due to the particle size of the soil, with the Red-Yellow Argisol (Inhapi) having a greater capacity for water retention. Extremely sandy soils, such as those in the Delmiro Gouveia region, had a low capacity for retaining water. For each soil sample, the exponential decay equation gave the best fit, with values for R2adjust of greater than 0.93. When the measured soil moisture levels were compared with the levels estimated by the RETC model, some of the treatments were unable to estimate accurately the moisture levels obtained with the soil water retention curves.
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Azan Basallo, Yasser, FRANCISCO ANTONIO HORTA RANGEL, JULIO CESAR LEAL VACA, JOSE MIGUEL SORIA UGALDE, and Jorge Luis Morales Martínez. "ALTERNATIVE ESTIMATION OF THE SOIL WATER RETENTION CURVE BASED ON THE ARYA-PARIS MODEL." DYNA ENERGIA Y SOSTENIBILIDAD 12, no. 1 (2023): [11P.]. http://dx.doi.org/10.6036/es10775.

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ABSTRACT: The physical and chemical characteristics of a soil determine its hydraulic properties, such as hydraulic conductivity, infiltration, and moisture. Due to the usefulness of a soil's moisture retention characteristic curve, several methodologies have been developed to obtain it. Mathematical models for the prediction of this hydraulic property constitute a type of methodologies that is economical and very affordable. One of the most practical models is the model of Arya and Paris (1981), which, however, requires an adjustment parameter, which limits its applicability in some cases, and, in addition, underestimates the moisture content by not considering the water remaining in the soil menisci. The present study proposes an alternative model based on the model of Arya and Paris, but that attempts to circumvent the disadvantages mentioned above, assuming a pore network formed by conical pores. The predictions of the moisture retention curve of our alternative model were compared with those of the original model through the root mean square error, using experimental data from 100 soils of three different textural classes, taken from the UNSODA database. The results by texture indicate that the alternative model generally produces better estimates for all three textures; however, for 17% of the soils the Arya and Paris model performed better. Keywords: water retention curve, retention, soil, porosity, volume.
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Grigolon, Gilmar Batista, Adriano Valentim Diotto, Carlos José Gonçalves de Souza Lima, João Paulo Francisco, and Marcos Vinícius Folegatti. "MINIMUM NUMBER OF POINTS FOR A RELIABLE SOIL WATER RETENTION CURVE USING RICHARDS’ PRESSURE CHAMBER." REVISTA ENGENHARIA NA AGRICULTURA - REVENG 28 (December 18, 2020): 477–87. http://dx.doi.org/10.13083/reveng.v29i1.7320.

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The soil hydro-physical characteristics are very important for studies about soil water dynamics. The soil water retention curve it is a soil characteristic sometimes expensive and time consuming to be done and could be a problem for farmers. The numbers of points and its tension evaluated are normally choose arbitrarily. This study aimed to define the fewest pairs of soil moisture and water soil potential points which result in a reliable water retention curve in two different soils (sandy and clay). Using different tensions by suction table and Richards’ pressure chamber, nine replications were adjusted by van Genuchten's equation. Curves with 4, 5, 7, 8, 9, 10 and 13 points were studied and the curve with 13 points was adopted as standard. The obtained parameters for different pairs of soil moisture and their corresponding soil water potential were compared to the equivalent standard curve and submitted to analysis of variance (F test), and their values were compared by the Scott-Knott test (5% of probability). The curve with 7 points, using the tensions of 0; 40; 100; 300; 1,000; 5,000 e 15,000 hPa, was the lower number of points that did not showed statistical difference in any parameters of the model and the point with 15,000 hPa shown to be important and should be used on the combination of points to obtain a good adjustment.
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Tavares Ordones Lemos, Lis, Fábio Ponciano de Deus, Michael Silveira Thebaldi, Adriano Valentim Diotto, Valter Carvalho de Andrade Júnior, and Rodrigo César de Almeida. "Influence of the soil water retention curve type and magnetic water treatment on lettuce irrigation management responses." Water Supply 21, no. 6 (2021): 2850–62. http://dx.doi.org/10.2166/ws.2021.038.

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Abstract This study aimed to evaluate the influence of magnetized water use on lettuce irrigation management responses, and based on the generated data, to evaluate by simulation the influence of soil water retention curve type on the lettuce irrigation management responses. This work was divided into three stages: 1 – determination of field and laboratory soil water retention curves; 2 – lettuce crop irrigation management experiment using soil water retention curve with field data, evaluating different soil water tensions to start irrigation and different water types (magnetically treated water, and non-treated water); and 3 – estimation of the irrigation management responses (simulation) using the soil water retention curve performed in the laboratory (using non-treated water), compared with the experimental results (stage 2). The use of magnetically treated water determined the soil moisture maintenance for a longer time and fewer irrigation events, leading to less water being applied and electricity consumption. The use of the soil water retention curve derived from the field data determined less water and electric energy consumption in Lucy Brown lettuce irrigation, in comparison with the simulated use of the soil water retention curve from laboratory data.
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Abdulwadood, Huda W., Gheidaa S. H. Al-Hassany, and Reem I. Mustafa. "IDW Interpolation of Soil Moisture Retention Curve Utilizing GIS." IOP Conference Series: Earth and Environmental Science 856, no. 1 (2021): 012040. http://dx.doi.org/10.1088/1755-1315/856/1/012040.

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Dissertations / Theses on the topic "Soil Moisture Retention Curve"

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Čermák, Petr. "Použití programu Rosetta k odhadu retenčních čar půdní vlhkosti z experimentální plochy Bohaté Málkovice." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227176.

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Hydraulic characteristics are the most important properties of soil, i.e. retention curve of soil moisture and hydraulic conductivity. Hydraulic conductivity of soil characterizes the ability of the soil to conduct water. Retention curve expresses the relationship between moisture and moisture potential of soil. The running of retention curve is influenced by many factors, eg. grain size and mineralogical composition, content of humus, reduce bulk density and structure of soil. Measurement of retention curves takes a lot of time and money in laboratory conditions therefore pedotransfer functions seem to be an alternative solution. The thesis aims to estimate moisture retention curves of soil in a selected area of interest in South Moravia using program Rosetta (Schaap, 2003). Data of granularity (% content of clay, sand and dust), bulk density of soil and hydrolimits field water capacity and wilting point were used as predictors in individual models of program Rosetta. Data of grain were matched by FAO / USDA system. Retention curves of soil moisture were measured on a sand tank and overpressure devices. The measured retention curves were parameterized by RETC program. Estimated retention curves were graphically compared with measured to determine the quality of the estimate. The accuracy of the estimate was assessed by correlation coefficient R of determination coefficient R2 and standard error SMRE. Usability own derivatives pedotransfer functions is hard to say due to the size of the input data file. I would recommend further verification of data at the other localities in south Moravia.
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Dikinya, Oagile. "The effects of self-filtration on saturated hydraulic conductivity in sodic sandy soils." University of Western Australia. School of Earth and Geographical Sciences, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0051.

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[Truncated abstract] Self-filtration is here defined as particle detachment and re-deposition causing re-arrangement of the particles and therefore pore space which affects water flow in soil by decreasing hydraulic conductivity. This is of particular important in soils which are susceptible to structural breakdown. The objective of this thesis was to examine the dynamics of the self-filtration process in sodic sandy soils as affected by ionic strength and soil solution composition. The temporal changes of hydraulic conductivity and the elution of fine particles from soil columns were used as the main criteria to assess selffiltration. Two porous media exhibiting significantly different structural cohesion were examined, one a loamy sand (Balkuling soil) from agricultural land use and the second a mining residue from mineral sands operations . . . The effects of the composition of mixed calcium (Ca) and sodium (Na) ions in solution (sodium adsorption ratio (SAR)) on the exchange behaviour and saturated hydraulic conductivity were examined by carrying out batch binary exchange and saturated column transport experiments. A strong preference for Ca2+ ions in the exchange complex was observed for both soils. Generally K/Ko was found to decrease with increasing sodium adsorption ratio with the more structured Balkuling soil maintaining K/Ko for SARs 3 and 5 at an electrolyte concentration of 100 mmol/L. However measurements at the critical threshold and turbidity concentrations at a SAR of 15 revealed structural breakdown of the pore matrix system attributed to various extents of slaking, swelling, dispersion and decreases of pore radii as a result of selffiltration during leaching. These experiments illustrate the wide range of complex interactions involving clay mineralogy, solution composition and structural factors which can influence the extent of mobilization, transport and re-deposition of colloidal particles during the leaching process in soil profiles.
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Juhász, Carlos Eduardo Pinto. "Relação solo-água-vegetação em uma toposseqüência localizada na Estação Ecológica de Assis, SP." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-17042006-163701/.

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O bioma Cerrado está cada vez mais fragmentado devido à ocupação agrícola e antrópica. Para a manutenção da biodiversidade, corredores de vegetação devem ser criados com o auxílio da revegetação e recuperação de áreas degradadas. Isto é facilitado pelo conhecimento da distribuição e dinâmica natural dos solos. O objetivo deste trabalho foi caracterizar o funcionamento físico-hídrico dos solos distribuídos em uma toposseqüência sob vegetação nativa. A área de estudo foi localizada dentro de uma parcela permanente instalada na Estação Ecológica de Assis, SP, Brasil, com vegetação predominante de cerradão ou savana florestada. Para a caracterização do funcionamento físico-hídrico dos solos foram realizados inicialmente estudos morfológicos, a partir da técnica da análise estrutural e da descrição de perfis de solo dispostos em cinco posições-chave da encosta. Amostras deformadas de solo foram utilizadas em análises químicas, granulométricas e densidade de partículas. Amostras indeformadas coletadas em anéis cilíndricos definiram as curvas de retenção de água e a densidade do solo. Blocos de solo foram impregnados e polidos para análise de imagens, obtendo-se a distribuição de poros em número, forma e tamanho. Em poços perfurados em três setores da toposseqüência, foi determinada a condutividade hidráulica saturada de campo. O monitoramento da umidade do solo “in situ” foi obtido por sensores instalados nos principais horizontes das trincheiras, calibrados para cada horizonte, durante o período de novembro de 2003 a novembro de 2004. Foram também utilizados os dados de precipitação mais próximos. Fotografias digitais adquiridas nos perfis de solo determinaram a distribuição das raízes. Os solos foram classificados, de montante a jusante, em Latossolo Vermelho, Latossolo Vermelho-Amarelo, Latossolo Amarelo e Gleissolo Háplico, com transição homogênea de cor e predomínio de textura franco-arenosa. No horizonte de superfície da toposseqüência, pequeno número de poros complexos de diâmetro equivalente superior a 1000µm ocupou quase a área total da imagem, representando uma estrutura de empilhamento de grãos simples com porosidade maior que em profundidade. Este comportamento provocou uma menor retenção hídrica, apesar do maior teor de matéria orgânica, e oscilação da umidade do solo após cada evento chuvoso. Predominaram raízes aglomeradas ou ramificadas nesta camada. Em profundidade, as raízes são mais individuais. Nos Latossolos, maior número de poros complexos de diâmetro equivalente superior a 1000 µm ocupa menor área em Bw do que em superfície. Isto indica a presença de aglomerados de microagregados em Bw que conferem maior retenção de água, maior número de microporos e menor oscilação da umidade do solo do que em superfície. No Gleissolo, o horizonte Btg2, mais profundo e mais argiloso, apresentou estrutura mais densa representada por uma porosidade expressiva de forma arredondada ou cavitária de diâmetro de 30 a 1000 µm. Neste horizonte, foi obtida a maior retenção hídrica, drenagem imperfeita e menor condutividade hidráulica. Nos outros horizontes da toposseqüência a condutividade foi elevada. O relevo influenciou nas propriedades físicohídricas e morfológicas dos solos que, por sua vez, determinaram o conteúdo de água limitante na estação seca e em períodos de estiagem. Este comportamento pode definir o padrão florístico de cerradão na parcela permanente.<br>The “Cerrado” bioma is being fragmented due to the human and agricultural occupation. To maintain the biodiversity, ecological corridors must be created by the revegetation and the restoration of the degraded areas. It can only be ameliorated upon the knowledge of the soil’s natural dynamics and distribution. The aim of this work was to characterize the behavior of soil water flow and soil physical properties, distributed in a toposequence under native vegetation. The study area was in a permanent plot installed in the Assis Ecological Station, São Paulo, Brazil. The predominant vegetation is the closed “cerrado” or savanna woodland. The soil physical, hydraulic characterization depended on soil morphology. The morphological study was carried out by structural analysis and by description of soil profiles arranged in five key positions on the slope. Disturbed soil samples were taken for chemical, particle size and soil particle density analyses. Undisturbed samples collected in cylindrical cores were used to define the soil water retention and bulk density. Soil blocks were impregnated and polished for image analysis to obtain the distribution of pores in number, shape and size. In wells perforated in three sectors of the toposequence the field saturated hydraulic conductivity was determined. The soil moisture monitoring “in situ” was obtained by sensors installed in the main horizons of the pits and calibrated for each soil horizon, during the period of November 2003 to November 2004. The nearest rain volume data were collected too. Digital photos of the soil profiles were acquired for the determination of the root distribution. The soils were classified, from the top backslope down to the footslope, as Rhodic Haplustox, Typic Haplustox and Epiaquic Haplustult, with a homogeneous color transition and the predominance of a sandy loam texture. In the soil surface on the toposequence, a little number of complex pores with equivalent diameter over 1,000 µm occupied almost the total pore area, characterizing the predominance of a structure formed by the packing of single grains. The porosity was higher than in the other horizons. This behavior caused lower water retention even with the highest organic matter content. On the surface, the oscillation of the soil moisture is closely related to each rain event. The roots were distributed in ramified or grouped roots in the surface layer and individually in the deeper horizons. In Oxisols, the presence of microaggregates in the B-horizon was characterized by a number of complex pores with equivalent diameter over 1,000 µm larger than in the soil surface but in minor area than in the surface layer. This conferred higher water retention, larger number of micropores and lower oscillation of soil moisture than in soil surface. The structure of the deepest B-horizon of Epiaquic Haplustult was denser, featured by an expressive rounded or vugh porosity with diameters between 30 and 1,000 µm. This conferred the largest content of clay, with the highest water retention, imperfect drainage and lowest hydraulic conductivity. The other soil horizons in the toposequence presented greater hydraulic conductivity. The landscape influences the physical, hydraulic and morphological soil properties in the toposequence. So the water content is limited in the dry season and partially in the humid season too, which can define the floristic pattern of the closed “cerrado” in this permanent plot.
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Gavlasová, Iva. "Pedotransferové funkce pro odhad vlhkostních retenčních křivek středně těžkých půd jižní Moravy." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226857.

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The most important characteristics of each soil is its hydro-physical properties, which include retention curve. Retention curve expresses the relationship between humidity and pressure head. It is course affected by many factors such as grain size and mineralogical composition, humus content, structure and bulk density of dry soil. This thesis deals with direct and indirect determination of one of the basic hydraulic characteristics of the soil, soil moisture retention curve. For laboratory determination of moisture retention curves were used for sand tank and pressure instruments. Measured body retention curves were optimized RETC program.For indirect determination of retention curves were used Pedotransfer function by Wösten et . al .(1998 ) , derived from the European soils and under HYPRES Šútora and Štekauerová (2000). As in the project Wösten et al . (1998), PTF were processed for arable land in the area. The accuracy of both models PTF was assessed by the correlation coefficient R and standard error RMSE. Simple models PTF provide estimates of retention curves with sufficient accuracy for practical use in the locality.
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Stoklásková, Adéla. "Stanovení hydraulických charakteristik půdy ve vybrané lokalitě." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225573.

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This thesis deals with direct and indirect determination of soil hydraulic characteristics (retention curve and hydraulic conductivity) in the locality of Bohaté Málkovice. For laboratory determination of soil moisture retention curve is used sand tank and pressure relief device. For the indirect determination of soil hydraulic characteristics is used computer software Rosetta, which includes 5 models of pedotransfer functions. For estimatiton of retention curves are applied previously derived pedotransfer function (continuous parametric PTF and point PTF).
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van, Quang Pham. "Soil formation and soil moisture dynamics in agriculture fields in the Mekong Delta, Vietnam conceptual and numerical models." Licentiate thesis, KTH, Land and Water Resources Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10508.

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<p>Previous studies of agricultural conditions in the Mekong Delta (MD) have identified soil compaction as an obstacle to sustainable production. A conceptual model for soil formation was presented to demonstrate the link between soil hydrology and plant response. Detailed studies of soil moisture dynamics in agricultural fields were conducted using a dynamic process-orientated model. Pressure head and water flow were simulated for three selected sites during a year for which empirical data were available. Daily meteorological data were used as dynamic input and measured pressure head was used to estimate parameter values that satisfied various acceptance criteria. The Generalised Likelihood Uncertainty Estimation (GLUE) approach was applied for calibration procedures with 10,000 runs, each run using random values within the chosen range of parameter values. To evaluate model performance and uncertainty estimation, re-sampling was carried out using coefficient of determination (R2) and mean error (ME) as the criteria. Correlations between parameters and R2 (and ME) and among parameters were also considered to analyse the relationship of the selected parameter set in response to increases/decreases in the acceptable simulations. The method was successful for two of the three sites, with many accepted simulations. For these sites, the uncertainty was reduced and it was possible to quantify the importance of the different parameters.</p><p> </p>
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Risken, Jacob Law. "Development and Use of Moisture-Suction Relationships for Geosynthetic Clay Liners." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1300.

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A laboratory test program was conducted to determine the moisture-suction relationships of geosynthetic clay liners (GCLs). Moisture-suction relationships were determined by combining suction data from pressure plate tests, contact filter paper tests, and relative humidity tests, then fitting water retention curves (WRCs) to the data. WRCs were determined for wetting processes and drying processes in terms of gravimetric moisture content and volumetric moisture content. The effects of GCL type, hydration solution, wet-dry cycles, and temperature on the moisture-suction relationships were analyzed. The three GCLs of the test program consisted of configurations of woven and nonwoven geotextiles reinforced with needlepunched fibers. A geofilm was adhesively bonded to the nonwoven side of one of the GCL products. The hydration solution tests involved hydrating GCLs with deionized water, tap water, 0.1 M CaCl2, or soil water from a landfill cover test plot for a 30-day conditioning period prior to testing. Cyclic wet-dry tests were conducted on the GCL specimens subjected to 20 wet-dry cycles from 50% to 0% gravimetric moisture content prior to testing. Temperature tests were conducted at 2°C, 20°C, and 40°C. GCL type affected moisture-suction relationships. The GCLs with an adhesively-bonded geofilm exhibited lower air-entry suction and higher residual suction than GCLs without a geofilm. The degree of needlepunched fiber pullout during hydration contributed to hysteresis between wetting WRCs and drying WRCs. Hysteresis was high for suction values below air-entry suction and was low for suction values greater than air-entry suction. Cation exchange reduced the water retention capacity for all three GCL types. The saturated gravimetric moisture contents were reduced from approximately 140% to 70% for wetting WRCs and 210% to 90% for drying WRCs for GCLs hydrated in deionized water compared to CaCl2 solution. Hysteresis of the nonwoven product decreased from 71%, to 62%, to 28% with respect to deionized water, tap water, and CaCl2 solution. Hysteresis of the woven product exposed to soil water was 24% and 0%, in terms of saturated gravimetric moisture content and saturated volumetric moisture content, respectively. The swell index, Atterberg Limits, mole fraction of bound sodium, and scanning electron microscopy images that were determined of bentonite from the conditioned GCLs indicated that changes in water retention capacity corresponded with cation exchange. Wet-dry cycles and temperature affected the moisture-suction behavior for GCLs. Wet-dry cycles reduced hysteresis and increased the swelling capacity of GCL specimens. Microscopy images indicated that wet-dry cycles caused weak orientation of the clay particles. Increasing temperature resulted in a small decrease in water retention capacity. Results of the test program provided a means for predicting unsaturated behavior for GCLs.
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8

Roshani, Pedram. "The Effect of Temperature on the SWCC and Estimation of the SWCC from Moisture Profile under a Controlled Thermal Gradient." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31072.

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In many situations, the upper layers of soil above the ground water table are in a state of unsaturated condition. Although unsaturated soils are found throughout the world, they are predominant in arid or semi-arid regions. In these areas, the soil water characteristic curve (SWCC) which relates the water content to the matric suction could be used as key tool to implement the mechanics of unsaturated soils into the designs of geotechnical structures such as dams, embankments, pavements, canals, and foundations. Several experimental techniques are available for determining the SWCC in a laboratory environment. However, these experimental techniques are expensive, time consuming typically requiring days or weeks, depending on the soil type, and demanding intricate testing equipment. Due to these reasons, there has been a growing interest to find other means for estimating SWCC and encourage the adoption of unsaturated soils mechanics in geotechnical engineering practice. Several methods exist to indirectly estimate the SWCC from basic soil properties. Some may include statistical estimation of the water content at selected matric suction values, correlation of soil properties with the fitting parameters of an analytical equation that represents the SWCC, estimation of the SWCC using a physics-based conceptual model, and artificial intelligence methods such as neural networks or genetic programming. However, many studies have shown that environmental effects such as temperature, soil structure, initial water content, void ratio, stress history, compaction method, etc. can also affect the SWCC. This means that the estimation SWCC from set of conditions may not reliably predict the SWCC in other conditions. Due to this reason, it is crucial for engineers involved with unsaturated soils to take into account all the factors that influence the SWCC. The two key objectives of the present thesis are the development of a method based on first principles, using the capillary rise theory, to predict the variation of the SWCC as a function of temperature, as well as developing a technique for the prediction of the fixed parameters of a well-known function representing the SWCC based on basic soil properties together with the moisture profile of a soil column subjected to a known temperature gradient. A rational approach using capillary rise theory and the effect of temperature on surface tension and liquid density is developed to study the relation between temperature and the parameters of the Fredlund and Xing (1994) equation. Several tests, using a Tempe cell submerged in a controlled temperature bath, were performed to determine the SWCC of two coarse-grained soils at different temperatures. A good comparison between the predicted SWCC at different temperatures using the proposed model and the measured values from the Tempe cell test results is achieved. Within the scope of this thesis, a separate testing program was undertaken to indirectly estimate the SWCC of the same two coarse-grained soils from the measurement of their steady state soil-moisture profile while subjected to a fixed temperature differences. The water potential equation in the liquid and vapor phases is used to analyses the steady state flow conditions in the unsaturated soil. A good comparison is obtained for the SWCC estimated using this technique with the SWCC measured used a Tempe cell submerged in a controlled temperature bath. The results of this study indicate that knowledge of the moisture content of a soil specimen under a constant thermal gradient and basic soil properties can be used to estimate the SWCC of the soil at the desired temperature.
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9

Almeida, Eurileny Lucas de. "Measurement of hydraulic conductivity and water retention curves for different methods and prediction of soil physical properties by kriging." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13855.

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FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico<br>Knowledge of the physical and hydraulic properties of the soil and its spatial dependence is important because it allows you to perform the zoning of the area in plots that receive differentiated management. This work was divided into three chapters whose general objective is to measure the hydraulic conductivity and water retention curve in soil by different methods and by using the Kriging, draw maps of soil physical attributes of the Irrigation Perimeter Baixo AcaraÃ. To obtain the water retention in soil curve method was used filter paper compared to the traditional method in five different soils Perimeter. To measure the hydraulic conductivity were used capacitive sensors to replace the tensiometer in the instantaneous profile installed method on a Argissolo Vermelho Amarelo eutrÃfico , as well as the calibration of these sensors in the field and laboratory. The maps were obtained by kriging of soil properties: sand, silt, clay, soil and particle density, porosity and saturated hydraulic conductivity. To obtain this last the tension infiltrometer and the constant load permeameter were used.<br>O conhecimento dos atributos fÃsico-hÃdricos do solo e de sua dependÃncia espacial à importante, pois permite realizar o zoneamento da Ãrea em glebas que receberÃo prÃticas de manejo diferenciadas. Este trabalho foi dividido em trÃs capÃtulos cujo objetivo geral à medir a condutividade hidrÃulica e a curva de retenÃÃo de Ãgua no solo por diferentes mÃtodos e, utilizando a Krigagem, elaborar mapas de atributos fÃsicos dos solos do PerÃmetro Irrigado Baixo AcaraÃ. Para obtenÃÃo da curva de retenÃÃo de Ãgua no solo foi utilizado o mÃtodo do papel filtro em comparaÃÃo ao mÃtodo tradicional em cinco diferentes solos do PerÃmetro. Para medida da condutividade hidrÃulica foram utilizados sensores capacitivos em substituiÃÃo aos tensiÃmetro no mÃtodo do perfil instantÃneo instalado em um Argissolo Vermelho Amarelo eutrÃfico, como tambÃm a calibraÃÃo desses sensores em campo e laboratÃrio. Os mapas obtidos atravÃs da Krigagem foram dos atributos do solo: areia, silte, argila, densidade do solo e partÃculas, porosidade e condutividade hidrÃulica saturada. Para obtenÃÃo deste ultimo foram utilizados o infiltrÃmetro de tensÃo e o permeÃmetro de carga constante.
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Zanello, Francesca. "Contributions to modeling of Venice coastal peatlands and wetlands." Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3427411.

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The present Thesis reports an articulated research work that covers several aspects connected with the modeling of subsurface hydrology of organic soils in connection to the main hazards induced by land subsidence of peatlands and the conservation and wise use of wetlands in the Venetian area. The dynamics of peatland surface deformation both at long and short time scale is studied and a novel two-step modeling approach is proposed to separate the reversible and irreversible components of the land surface displacement. An empirical relationship is calibrated on the estimated irreversible component of the ground displacements recorded in a 4-year long experimental study in a field site located in the Zennare Basin,Italy. The expected evolution of the Venetian peatland over the present century is then investigated. The study of the hydrology of organic soils is then focused on the hysteretical behavior of the moisture retention curve measured in the peat soils of the Zennare Basin. The results of the application of a modeling approach that couples an hysteresis model with a relationship that links the soil matrix porosity dynamic to water saturation bring out the importance of including the swelling/shrinkage phenomenon in the description and prediction of water flow into organic soils. In the last part of the Thesis the focus is shifted to the hydrological dynamics of salt marshes, delicate intertidal zones characterized by a strong hydrological connection between the atmosphere and the subsurface mainly in terms of air fluxes. A two-phase flow model is developed in order to investigate the effects of air flow in the wetlands dynamics. A pressure-based formulation is chosen to allow for natural treatment of the complex and nonlinear boundary conditions to be imposed at the soil-atmosphere interface to take into account the interplay between evapo-transpiration during emersion periods and tidal fluctuations during soil submersion. The results of the application of the model to some test cases aimed at verifying the effect of the inclusion of the air dynamics in the simulation of the water flow in the vadose zone are presented.<br>La presente Tesi riferisce di un articolato lavoro di ricerca che ha coperto diversi aspetti connessi con la modellazione dei processi idrologici sotterranei nei suoli organici in relazione ai principali rischi indotti dalla subsidenza delle aree torbose e alla conservazione e all’uso consapevole delle aree umide nel comprensorio lagunare veneziano. Sono state analizzate le dinamiche delle deformazioni dei terreni torbosi sia su lunga che su breve scala temporale e si propone un approccio modellistico in due step finalizzato alla separazione dei contributi reversibile e irreversibile della dello spostamento della superficie. Una relazione empirica per la stima degli spostamenti indotti dalla bio-ossidazione della matrice organica è stata quindi calibrata a partire dalla stimata determinata porzione irreversibile degli spostamenti registrati nell’ambito di una campagna sperimentale di 4 anni nel Bacino Zennare, Italia, Si è infine investigato l’evoluzione attesa delle zone torbose nell’area di Venezia nel secolo in corso. Lo studio dell’idrologia dei suoli organici è proseguito con l’analisi del comportamento isteretico della curva di ritenzione capillare misurata nei suoli del Bacino Zennare. I risultati dell’applicazione di un modello che accoppia un modello di isteresi con una relazione empirica che lega la variazione di porosità della matrice solida al grado di saturazione in acqua hanno messo in luce l’importanza delle deformazioni reversibili nella definizione delle curve di risalita capillare nei suoli organici. L’ultima parte è focalizzata sulle dinamiche idrologiche delle zone barenali, delicate aree intertidali caratterizzate da un forte feedback tra l’atmosfera e il sottosuolo, principalmente in termini di flussi d’aria. Si è sviluppato un modello bifase al fine di approfondire gli effetti del flusso d’aria nelle dinamiche sotterranee. È stato adottata una formulazione alle pressioni che consente il trattamento naturale delle complesse condizioni al contorno non lineari sull’interfaccio suolo/atmosfera al fine di includere gli effetti di evapotraspirazione durante i periodi di emersione e le fluttuazioni mareali in quelle di sommersione della superficie barenale. I risultati dell’applicazione del modello ad alcuni casi test finalizzati al verificare l’importanza di considerare il flusso d’aria nella descrizione del flusso idrico nella zona insatura sono infine proposti.
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Books on the topic "Soil Moisture Retention Curve"

1

Heidmann, L. J. Comparison of moisture retention curves for representative basaltic and sedimentary soils in Arizona prepared by two methods. USDA Forest Service, Rocky Mountain Forest and Range Experiment Station, 1990.

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Commission, Somalia National Refugee, ed. Farjano Settlement Project land evaluation: Addendum, soil moisture retention results. Sir M. MacDonald & Partners Ltd., 1985.

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Moore, David W. Soil-moisture retention in spoil during dry conditions at the Rosebud coal mine near Colstrip, Montana. U.S. Dept. of the Interior, Geological Survey, 1985.

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W, Moore David. Soil-moisture retention in spoil during dry conditions at the Rosebud coal mine near Colstrip, Montana. U.S. Dept. of the Interior, Geological Survey, 1985.

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W, Moore David. Soil-moisture retention in spoil during dry conditions at the Rosebud coal mine near Colstrip, Montana. U.S. Dept. of the Interior, Geological Survey, 1985.

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W, Moore David. Soil-moisture retention in spoil during dry conditions at the Rosebud coal mine near Colstrip, Montana. U.S. Dept. of the Interior, Geological Survey, 1985.

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Heidmann, L. J. Comparison of moisture retention curves for representative basaltic and sedimentary soils in Arizona prepared by two methods. 1990.

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Peat and water: Aspects of water retention and dewatering in peat. Elsevier Applied Science Publishers, 1986.

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Book chapters on the topic "Soil Moisture Retention Curve"

1

Novák, Viliam, and Hana Hlaváčiková. "Soil-Water Retention Curve." In Applied Soil Hydrology. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01806-1_7.

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Tarafdar, J. C., and Indira Rathore. "Use of Nanoparticles in Moisture Retention and Soil Health Management." In Nanoscience and Soil-Water Interaction in Agroecosystem. CRC Press, 2024. https://doi.org/10.1201/9781003429289-2.

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Sharanya, A. G., M. Heeralal, and T. Thyagaraj. "Modelling Soil Water Retention Curve for Cohesive Soil Using Artificial Neural Network." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-6513-5_31.

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Abhijit, D., and S. Sreedeep. "Investigation of Bentonite Qualities on Water Retention Characteristic Curve." In Novel Issues on Unsaturated Soil Mechanics and Rock Engineering. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01935-8_1.

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Meena, Ray Singh Meena, and Ramakar Jha. "New Approach to Evolve Soil Water Retention Curve in Lower Kosi Basin, India." In Hydrological Modeling. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-81358-1_25.

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Zhang, Jiwen, and Qingyi Mu. "An Unfrozen Water Retention Curve for Capturing Soil Density and Specific Surface Effects." In Lecture Notes in Civil Engineering. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4324-5_2.

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François, Bertrand, and Sana Ettahiri. "Role of the Soil Mineralogy on the Temperature Dependence of the Water Retention Curve." In Unsaturated Soils: Research and Applications. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31116-1_23.

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Bottiglieri, Osvaldo, Francesco Cafaro, and Federica Cotecchia. "Estimating the Retention Curve of a Compacted Soil through Different Testing and Interpretation Methods." In Unsaturated Soils: Research and Applications. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31116-1_7.

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Abdallah, Adel. "Prediction of the Soil Water Retention Curve from Basic Geotechnical Parameters by Machine Learning Techniques." In Information Technology in Geo-Engineering. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-32029-4_33.

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Liyanage, Randhilini, Ahmad Mousa, Ankit Garg, Fauziah Ahmad, and Vivi Anggraini. "The Use of Field Water Retention and Ambient Temperature for Developing the Soil Water Characteristic Curve." In Climate Change Adaptation from Geotechnical Perspectives. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-9215-7_38.

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Conference papers on the topic "Soil Moisture Retention Curve"

1

Tolentino, Marcus Caesar B., Josh Clarence Y. Munsayac, John David M. Lagman, et al. "Assessment of Moisture Retention of Soil with Biochar Using Linear Regression and Neural Network Pattern Recognition." In 2024 2nd International Conference on Artificial Intelligence and Automation Control (AIAC). IEEE, 2024. https://doi.org/10.1109/aiac63745.2024.10899725.

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ALMEIDA, A. M., E. F. FRAGA JUNIOR, R. D. COELHO, T. H. S. BARROS, and A. J. FARIAS. "FIELD CAPACITY ESTIMATION FROM THE INFLECTION POINT OF THE SOIL MOISTURE RETENTION CURVE." In IV Inovagri International Meeting. INOVAGRI/ESALQ-USP/ABID/UFRB/INCT-EI/INCTSal/INSTITUTO FUTURE, 2017. http://dx.doi.org/10.7127/iv-inovagri-meeting-2017-res0250268.

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Pioli, B. C., A. M. S. Maximiano, and F. A. M. Marinho. "Soil-Gasoline Retention Curve for a Uniform Sand." In Second Pan-American Conference on Unsaturated Soils. American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481684.005.

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Konyai, S., V. Sriboonlue, V. Trelo-ges, and N. Muangson. "Hysteresis of Water Retention Curve of Saline Soil." In Fourth International Conference on Unsaturated Soils. American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)115.

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Garcia, Elizabeth Silva, and Eduardo Rojas. "Estimation of soil-water retention curve for expansive soils." In 2021 XVII International Engineering Congress (CONIIN). IEEE, 2021. http://dx.doi.org/10.1109/coniin54356.2021.9634707.

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Pecapedra, Luana L., Orlando M. de Oliveira, Rafael A. dos R. Higashi, and Fernando A. M. Marinho. "Comparative Analysis of Water Retention Curves of Residual Soils of Gneiss, Granite and Diabase, Compacted under Optimum Moisture Conditions." In Second Pan-American Conference on Unsaturated Soils. American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481707.038.

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Rodrigues, R. A., and O. M. Vilar. "Relationship between Collapse and Soil-Water Retention Curve of a Sandy Soil." In Fourth International Conference on Unsaturated Soils. American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)83.

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G.N. Flerchinger, M.S. Seyfried, and S.P. Hardegree. "Estimation of the Soil Moisture Characteristic Curve from the Soil Freezing Characteristic." In 2004, Ottawa, Canada August 1 - 4, 2004. American Society of Agricultural and Biological Engineers, 2004. http://dx.doi.org/10.13031/2013.16186.

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Gao, Jin, and Yanfeng Liu. "Soil water retention curve analysis using radial basis function network." In 2010 Sixth International Conference on Natural Computation (ICNC). IEEE, 2010. http://dx.doi.org/10.1109/icnc.2010.5583105.

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Sarker, Debojit, William Radnor, Stacey E. Kulesza, and Michelle L. Barry. "Evaluation of Soil Water Retention Curve Models for Fouled Ballast." In Geo-Congress 2023. American Society of Civil Engineers, 2023. http://dx.doi.org/10.1061/9780784484708.062.

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Reports on the topic "Soil Moisture Retention Curve"

1

Heidmann, L. J., Michael G. Harrington, and Rudy M. King. Comparison of moisture retention curves for representative basaltic and sedimentary soils in Arizona prepared by two methods. U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, 1990. http://dx.doi.org/10.2737/rm-rn-500.

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2

Heidmann, L. J., Michael G. Harrington, and Rudy M. King. Comparison of moisture retention curves for representative basaltic and sedimentary soils in Arizona prepared by two methods. U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, 1990. http://dx.doi.org/10.2737/rm-rn-500.

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Morsy, Amr, and Islam Ebo. Development of Physics-Based Deterioration Models for Reinforced Soil Retaining Structures. Mineta Transportation Institute, 2025. https://doi.org/10.31979/mti.2024.2360.

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Reinforced soil walls are key earth retention features in the transportation infrastructure. They are used to support and retain soil in a wide variety of crucial structures, such as highways, bridges, and railways, to ensure stability. They also provide solutions for constructing embankments and slopes in constrained spaces, allowing for efficient land use and improved infrastructure planning. This study used advanced numerical modeling to improve the understanding of the behavior and long-term performance of the aging reinforced soil walls from the 1970s for asset management purposes. An asset-scale model was created to simulate the effects of weather on these walls. The model included a system to track how moisture-driven corrosion affects wall stability and performance over time. The model outputs provide implications on the wall progressive deterioration over time and estimates for the wall remaining service life. Unlike newer wall generations constructed with strict specifications that limit fill corrosivity, early wall generations may maintain high levels of moisture for prolonged periods that can significantly increase corrosion rates. Accordingly, it is recommended that fill moisture monitoring be added to asset management measures for early generation walls that could have been constructed with highly corrosive or poorly drainable fills. The results of this study indicate that even though corrosion rates vary with changes in fill moisture, the overall loss in reinforcement thickness happens at a steady rate, showing a linear relationship between cumulative corrosion and time. The results also indicate that 25% fluctuation in fill moisture has no to little effect on the cumulative corrosion, and that the average fill moisture can be used to predict an approximate long-term cumulative corrosion. Thus, it is recommended to use one year of seasonal climate data for a specific location to estimate the annual variation in fill moisture. This can predict the yearly corrosion of reinforcements, which can then be multiplied by the number of service years to estimate long-term cumulative corrosion. Finally, an asset-scale performance model based on performance-requirement failure framework was developed using the outputs of the asset-scale numerical model. These performance models can inform decisions about critical transportation infrastructure maintenance, repair, or replacement strategies, and optimizing resource allocation.
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Kinikles, Dellena, and John McCartney. Hyperbolic Hydro-mechanical Model for Seismic Compression Prediction of Unsaturated Soils in the Funicular Regime. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, 2022. http://dx.doi.org/10.55461/yunw7668.

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A semi-empirical elasto-plastic constitutive model with a hyperbolic stress-strain curve was developed with the goal of predicting the seismic compression of unsaturated sands in the funicular regime of the soil-water retention curve (SWRC) during undrained cyclic shearing. Using a flow rule derived from energy considerations, the evolution in plastic volumetric strain (seismic compression) was predicted from the plastic shear strains of the hysteretic hyperbolic stress-strain curve. The plastic volumetric strains are used to predict the changes in degree of saturation from phase relationships and changes in pore air pressure from Boyle’s and Henry’s laws. The degree of saturation was used to estimate changes in matric suction from the transient scanning paths of the SWRC. Changes in small-strain shear modulus estimated from changes in mean effective stress computed from the constant total stress and changes in pore air pressure, degree of saturation and matric suction, in turn affect the hyperbolic stress-strain curve’s shape and the evolution in plastic volumetric strain. The model was calibrated using experimental shear stress-strain backbone curves from drained cyclic simple shear tests and transient SWRC scanning path measurements from undrained cyclic simple shear tests. Then the model predictions were validated using experimental data from undrained cyclic simple shear tests on unsaturated sand specimens with different initial degrees of saturation in the funicular regime. While the model captured the coupled evolution in hydro-mechanical variables (pore air pressure, pore water pressure, matric suction, degree of saturation, volumetric strain, effective stress, shear modulus) well over the first 15 cycles of shearing, the predictions were less accurate after continued cyclic shearing up to 200 cycles. After large numbers of cycles of undrained shearing, a linear decreasing trend between seismic compression and initial degree of saturation was predicted from the model while a nonlinear increasing-decreasing trend was observed in the cyclic simple shear experiments. This discrepancy may be due to not considering post shearing reconsolidation in the model, calibration of model parameters, or experimental issues including a drift in the position of the hysteretic shear-stress strain curve. Nonetheless, the trend from the model is consistent with predictions from previously- developed empirical models in the funicular regime of the SWRC. The developments of the new mechanistic model developed in this study will play a key role in the future development of a holistic model for predicting the seismic compression across all regimes of the SWRC.
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