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Relevant bibliographies by topics / Hydric soils

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Academic literature on the topic 'Hydric soils'

Author: Grafiati

Published: 4 June 2021

Last updated: 27 January 2023

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Journal articles on the topic "Hydric soils"

1

Hurt, G. W., and V. W. Carlisle. "Using Hydric Soil Indicators in Disturbed Soils." Soil Horizons 38, no. 4 (1997): 101. http://dx.doi.org/10.2136/sh1997.4.0101.

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Berkowitz, Jacob F., and James Barrett Sallee. "Investigating Problematic Hydric Soils using Hydrology, IRIS Tubes, Chemistry, and the Hydric Soils Technical Standard." Soil Science Society of America Journal 75, no. 6 (November 2011): 2379–85. http://dx.doi.org/10.2136/sssaj2011.0040.

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Kelley, John A. "Photographing Hydric Soils and Held Indicators." Soil Horizons 50, no. 1 (2009): 17. http://dx.doi.org/10.2136/sh2009.1.0017.

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Megonigal, J. P., S. P. Faulkner, and W. H. Patrick. "The Microbial Activity Season in Southeastern Hydric Soils." Soil Science Society of America Journal 60, no. 4 (July 1996): 1263–66. http://dx.doi.org/10.2136/sssaj1996.03615995006000040043x.

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Grimley, D. A., and M. J. Vepraskas. "Magnetic Susceptibility for Use in Delineating Hydric Soils." Soil Science Society of America Journal 64, no. 6 (November 2000): 2174–80. http://dx.doi.org/10.2136/sssaj2000.6462174x.

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Clausnitzer, David, J. Herbert Huddleston, Edward Horn, Mark Keller, and Curtis Leet. "Hydric Soils in a Southeastern Oregon Vernal Pool." Soil Science Society of America Journal 67, no. 3 (2003): 951. http://dx.doi.org/10.2136/sssaj2003.0951.

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Clausnitzer, David, J. Herbert Huddleston, Edward Horn, Mark Keller, and Curtis Leet. "Hydric Soils in a Southeastern Oregon Vernal Pool." Soil Science Society of America Journal 67, no. 3 (May 2003): 951–60. http://dx.doi.org/10.2136/sssaj2003.9510.

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Moorhead, Kevin K. "Diversity of hydric soils in North Carolina, USA." Environmental Management 14, no. 2 (March 1990): 241–47. http://dx.doi.org/10.1007/bf02394041.

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Amon, James P., Carolyn S. Jacobson, and Michael L. Shelley. "Construction of fens with and without hydric soils." Ecological Engineering 24, no. 4 (April 2005): 341–57. http://dx.doi.org/10.1016/j.ecoleng.2004.11.011.

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Zwanka, W. P., G. W. Hurt, D. A. Graetz, W. D. Graham, and Clark M. W. "Using Magnetic Susceptibility to Delineate Hydric Soils in Southeastern Coastal Plain Soils." Soil Horizons 48, no. 2 (2007): 32. http://dx.doi.org/10.2136/sh2007.2.0032.

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Dissertations / Theses on the topic "Hydric soils"

1

Andrews, Lisa M. "Loblolly pine response to drainage and fertilization of hydric soils." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-12162009-020152/.

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Cohen, Susan Alese. "Regenerating Longleaf Pine on Hydric Soils - Short-Term Effects on Soil Properties and Seedling Establishment." NCSU, 2008. http://www.lib.ncsu.edu/theses/available/etd-04282008-191226/.

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Restoring longleaf pine ecosystems is essential for managing rare plant and animal species and protecting biological diversity in the southeastern Coastal Plain of the United States. Natural longleaf pine ecosystems range from xeric uplands to poorly-drained flatwoods and savannas. Most existing stands, however, occur on xeric to dry-mesic sites and approaches to restoring longleaf pine to wetter sites traditionally utilize intensive practices. There is little information available on the efficacy of these practices to establish longleaf pine seedlings on poorly-drained sites and their impacts on soil properties, seedling survival and growth, and the understory plant community. A research project was established at Marine Corps Base Camp Lejeune, NC to evaluate the effects of site preparation methods for returning longleaf pine on hydric soils with no natural seed source. Various site preparation treatments were evaluated in a field experiment, and results revealed greater growth and earlier emergence from the grass stage with more intensive site preparation. There was a marginal increase in soil nutrients, and a slight increase in foliar nutrients found with the more intensive treatments. Site preparation influenced seedling growth in the short-term and this was likely due to the cumulative effects of controlling competition and modifying the planting site. Marine Corps Base Camp Lejeune and other Department of Defense installations include both former and remnant longleaf pine ecosystems that support federally protected plants and animals such as the red-cockaded woodpecker - and thus face the challenge of restoring former, poorly-drained longleaf pine ecosystems. A land use history revealed that, largely due to its poorly-drained status and inaccessibility, the majority of disturbance on the research area occurred after the 1920âs and was largely due to forestry activities. Since purchasing the land area of the project in 1996, the Marine Corpsâ challenge has been to balance the mission of training and readiness with the need for restoration and long-term management of longleaf pine ecosystems. The results of this work provide natural resource managers with a scientific foundation for assessing choices to assist in this restoration and management effort.

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Stephens, Kyle. "Characterization of wetland soils in the Beaver Creek Watershed." Morgantown, W. Va. : [West Virginia University Libraries], 2003. http://etd.wvu.edu/templates/showETD.cfm?recnum=2864.

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Thesis (M.S.)--West Virginia University, 2003.
Title from document title page. Document formatted into pages; contains vi, 131 p. : ill. (some col.), col. map. Vita. Includes abstract. Includes bibliographical references (p. 69-74).

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Cummings, Angela R. "An Analysis of Palustrine Mitigation Wetlands in the Virginia Coastal Plain." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/78141.

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In recent years, the success of wetland mitigation projects and their ability to function as natural systems has been questioned. This study was conducted (i) to characterize and examine differences between mitigation and natural wetlands, (ii) to examine differences in soil morphology along a wetness gradient in mitigation and natural wetlands, and (iii) to observe changes in mitigation wetlands with time. Site characteristics, including soil properties, hydrology, and vegetation, were analyzed for three mitigation-reference wetland pairs located in the Virginia Coastal Plain. Hydrologic regimes of mitigation areas, when compared to reference areas, generally showed larger differentials between seasonal high and low watertables. Mitigation areas, dominated by herbaceous vegetation, tended to be lower in C and N levels and higher in soil pH, and much higher in bulk density than the mature forested reference wetland. Initially low levels of C and N did not increase significantly over the five-year study period. Soils in the mitigation area were more uniform and considerably less differentiated when compared to those of the reference area. Testing for Fe(II) with alpha-alpha, dipyridyl dye solution produced mixed results, obtaining both positive and negative reactions to saturated samples. Oxidized rhizospheres, associated with active root channels in surface horizons, formed in less than ten years under the current hydrologic conditions. These features were more abundant and more prominent in areas saturated at or above the surface for longer periods of time. Overall, site differences between mitigation and reference areas are mainly due to construction practices and a lack of organic matter accumulation. Better design methods should incorporate the addition of organic amendments, with attempts to minimize soil compaction.
Master of Science

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Yaakoubd, Bouchra. "Relations hydriques et formation des racines adventives caulinaires chez des semis d'épinette noire (Picea mariana (Mill.) B.S.P.) /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1997. http://theses.uqac.ca.

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Fajardo, Gabriela Isabel. "Physical and Chemical Soil Properties of Ten Virginia Department of Transportation (VDOT) Mitigation Wetlands." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/31304.

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In 1998, the Virginia Department of Transportation (VDOT) adopted standards for soil handling and amendments to improve created non-tidal wetland soil conditions. This study was conducted in sites where these new reconstruction practices were supposedly being implemented. Specific objectives were (i) to determine the relative effects of soil reconstruction practices on mitigation site soils, (ii) to assess the degree to which hydric soil indicators were present, and (iii) to evaluate the relative edaphic potential of mitigation site soils. Soil physical, chemical and morphological properties were analyzed in ten mitigation wetlands located in Virginiaâ s Piedmont and Coastal Plain. Surface soil pH was high due to liming, although some sites demonstrated low subsoil pH, indicating the presence of sulfidic materials. Nutrient levels varied, while C:N ratios were low (<25:1), suggesting a high quality organic matter complex. Organic amendments were generally applied at a rate of 4% soil organic matter content. Actual measured carbon content was <2.6% (<50 Mg ha-1). Sites not receiving organic materials and associated tillage had root-limiting bulk densities at the surface, while the majority of sites had root-limiting subsoil (30 cm) bulk densities due to weakly developed soil structure and a lack of deep ripping practices. Many sites also contained high sand content (>50%), which may negatively affect other soil properties. Nine sites had confirmed Hydric Soil Indicators, with their occurrence in a site as high as 70%. Soil reconstruction methods need to incorporate higher organic amendment rates and/or routine disking/ripping practices to improve mitigation wetland soil conditions.
Master of Science

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Bergschneider, Cara Renee. "Determining an Appropriate Organic Matter Loading Rate for a Created Coastal Plain Forested Wetland." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/34698.

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Past research indicates that created non-tidal wetlands in the mid-Atlantic region are considerably lower in soil organic matter than native forested hydric soils. However, optimal loading rates for created wetland soil reconstruction have not been rigorously established. Our objective was to determine appropriate organic amendment loading rates for a Coastal Plain mitigation wetland based on 1) soil properties reflective of hydric soil development, 2) the formation of redoximorphic features, and 3) the growth and vigor of hydrophytic vegetation. The study contained wet (CCW-Wet) and dry (CCW-Dry) experiments, each receiving 6 compost treatments (0 Mg/ha untilled and 0, 56, 112, 224, and 336 Mg/ha tilled). Over the 1.5-year monitoring period, redox potential decreased and redoximorphic feature formation increased with compost loadings up to 112 Mg/ha. Surface bulk density decreased with loadings up to 224 Mg/ha, while no treatment differences were noted in sub-surface bulk density. In the CCW-Dry experiment, soil moisture peaked in the 224 Mg/ha treatment, while soil moisture in CCW-Wet increased consistently across all loadings. Total biomass in CCW-Wet and Betula nigra L. growth in both experiments increased with loading rate. Total biomass in CCW-Dry and Quercus palustris Muench. growth in both experiments peaked at 112 Mg/ha, although differences were not significant. Collectively, these findings indicate that 112 Mg/ha of high quality organic amendment was optimal for inducing hydric soil conditions and positive hydrophytic vegetation response. Incorporating compost at rates exceeding 112 Mg/ha is challenging and leads to higher surface elevations and redox levels in the initial growing season.
Master of Science

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Smith, Jill M. "Water table fluctuation in an East Central Indiana toposequence." Virtual Press, 1996. http://liblink.bsu.edu/uhtbin/catkey/1036198.

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Groundwater affects the development of soil in many ways. Due to the natural relationship between soil and groundwater this study was aimed at determining whether soils affect the water table depth, episaturation occurs, and hydric soils exist at the study site. The three soils studied include Pewamo (poorly drained), Blount (somewhat poorly drained) and Glynwood (moderately well drained).Water table data were collected in 1994 and 1995 at the Hults Environmental Learning Center in Albany, Indiana. Soil, by itself, was not found to be significant in affecting water table depth whereas position (horizon), soil by position and Julian date were all found to be highly significant. Soils were affected by existing drainage tile found in Pewamo that acted to lower the water table. Blount and Glynwood were found to have a period of episaturation whereas Pewamo was found to be endosaturated. The soils were not found to be hydric based on the depth to the water table only.
Department of Natural Resources and Environmental Management

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MOTTA, MARIANA FERREIRA BENESSIUTI. "PHYSICAL-HYDRIC-STRUCTURAL CHARACTERIZATION AND EFFECTS OF INCREASE OF AIR PRESSURE ON THE STRENGHT OF UNSATURATED TROPICAL SOILS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=30295@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
FUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO
PROGRAMA DE EXCELENCIA ACADEMICA
BOLSA NOTA 10
Esta tese apresenta um estudo relacionado a dois importantes aspectos da mecânica dos solos não saturados: a caracterização físico-hídrico-estrutural e o efeito do aumento súbito da pressão de ar em solos tropicais não saturados do Rio de Janeiro. A primeira contribuição aborda uma avaliação ampla de parâmetros físicos, químicos, mineralógicos e do efeito da estrutura destes solos em características estruturais, mecânicas, hidráulicas e de deformabilidade. O segundo aspecto, relacionado à avaliação do efeito do aumento da pressão de ar, foi realizado através de ensaios triaxiais não saturados, do tipo CW, com medidas de velocidade da onda cisalhante. Para atingir este último objetivo, um equipamento triaxial servocontrolado não saturado, com instrumentação interna de bender elements, foi implementado. Todos os ensaios foram realizados em amostras indeformadas e reconstituídas, com mesmo teor de umidade e índice de vazios, em dois solos residuais jovens e em um solo coluvionar coletados em Nova Friburgo e Tinguá, RJ. Os resultados obtidos permitiram avaliar que apesar de alguns solos possuírem características físicas semelhantes, estes apresentaram comportamentos mecânicos, hidráulicos e estruturais diferentes. Com relação aos ensaios triaxiais não saturados CW, não foi possível observar um comportamento característico e conclusivo do efeito do incremento de ar nos solos. A verificação individual do pulso de ar em cada amostra estudada indicou, para a maioria dos ensaios, diminuição das velocidades das ondas cisalhantes (Vs) após o aumento.
This thesis presents a study related to two important aspects of unsaturated soil mechanics: a physical-hydric-structural charaterization and the effects of increase of air pressure on the strength of unsaturated tropical soils from Rio de Janeiro. The first contribution exhibits an extensive experimental program aiming to evaluate effcts of physical, chemical, mineralogical and soil structure in the mechanical, hydraulic and deformability characteristics of the soils. The second contribution, related to the effects of increase of air pressure, was performed through constant water content triaxial tests with measurements of shear wave velocities. In order to achieve this last objective, an unsaturated triaxial apparatus with bender elements was implemented. The tests were carried out on undisturbed and reconstituted samples, with the same moisture content and void ratio, in two young residual soils and a colluvial soil from Nova Friburgo and Tinguá, RJ. The results showed that although some soils had similar physical characteristics, they had different mechanical, hydraulic and structural behaviors. Regarding the unsaturated triaxial tests, it was not possible to observe a characteristic and conclusive behavior of the effect of increase of air pressure in soils. The individual evaluation in each sample studied indicated that, for most tests, the increase in air pressure caused decrease in shear wave velocities (Vs).

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Powell, Katherine Moore. "Quantifying soil organic carbon (SOC) in wetlands impacted by groundwater withdrawals in west-central Florida." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002590.

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Books on the topic "Hydric soils"

1

United States. Soil Conservation Service. Hydric soils of the United States. 3rd ed. Washington, D.C.?]: The Service, 1991.

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Stevens, Michelle L. Washington State hydric soils guidebook. Edited by Bursick Robert, Cooke Sarah, Pringle Russell F, and Washington (State). Dept. of Ecology. Wetlands Section. Olympia, WA: Wetlands Section, Washington State Dept. of Ecology, 1990.

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J, Vepraskas Michael, Sprecher Steven William, Soil Science Society of America. Division S-10., Soil Science Society of America. Division S-5., and American Society of Agronomy. Division A-2., eds. Aquic conditions and hydric soils: The problem soils. Madison, Wisc: Soil Science Society of America, Inc., 1997.

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Vepraskas, M. J., and S. W. Sprecher, eds. Aquic Conditions and Hydric Soils: The Problem Soils. Madison, WI, USA: Soil Science Society of America, 1997. http://dx.doi.org/10.2136/sssaspecpub50.

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A, Khmelev V., ed. Sopri͡a︡zhennye ri͡a︡dy pochv zabolochennykh landshaftov. Novosibirsk: VO "Nauka", 1992.

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Texas), International Soil Correlation Meeting (8th 1990 Louisiana and. Proceedings of the Eighth International Soil Correlation Meeting (VIII ISCOM): Characterization, classification, and utilization of wet soils : Louisiana and Texas, October 6-21, 1990. [Washington, D.C.?]: Soil Conservation Service, USDA, 1992.

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Edmonds, W. J. Tidewater Virginia tidal wetland soils: A reconnaissance characterization. Blacksburg, Va: Dept. of Crop and Soil Environmental Sciences, Virginia Agricultural Experiment Station, 1990.

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Erickson, Nanette E. Soil-vegetation correlations in coastal Mississippi wetlands. Washington, DC: U.S. Dept. of the Interior, Fish and Wildlife Service, Research and Development, 1988.

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Veneman, Peter L. M. Soil-vegetation correlations in the Connecticut River floodplain of western Massachusetts. Washington, D.C: U.S. Dept. of the Interior, Fish and Wildlife Service, 1990.

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Veneman, Peter L. M. Soil-vegetation correlations in the Connecticut River floodplain of western Massachusetts. Washington, D.C: U.S. Dept. of the Interior, Fish and Wildlife Service, 1990.

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Book chapters on the topic "Hydric soils"

1

Lag, J., Amos Hadas, Rhodes W. Fairbridge, J. C. Nóvoa Muñoz, X. Pontevedra Pombal, A. Martínez Cortizas, Gonzalo Almendros, et al. "Hydric Soils." In Encyclopedia of Soil Science, 323–25. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-3995-9_276.

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Trettin, Carl C., Randall K. Kolka, Anne S. Marsh, Sheel Bansal, Erik A. Lilleskov, Patrick Megonigal, Marla J. Stelk, et al. "Wetland and Hydric Soils." In Forest and Rangeland Soils of the United States Under Changing Conditions, 99–126. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45216-2_6.

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Bellia, Zoheir, Moulay Smaine Ghembaza, and Mohamed Rabhi. "Hydric Model of Unsaturated Soils." In Unsaturated Soils: Research and Applications, 63–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31343-1_8.

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Vepraskas, M. J., and S. W. Sprecher. "Overview of Aquic Conditions and Hydric Soils." In Aquic Conditions and Hydric Soils: The Problem Soils, 1–22. Madison, WI, USA: Soil Science Society of America, 2015. http://dx.doi.org/10.2136/sssaspecpub50.c1.

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Kuehl, R. J., N. B. Comerford, and R. B. Brown. "Aquods and Psammaquents: Problems in Hydric Soil Identification." In Aquic Conditions and Hydric Soils: The Problem Soils, 41–59. Madison, WI, USA: Soil Science Society of America, 2015. http://dx.doi.org/10.2136/sssaspecpub50.c3.

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Vepraskas, M. J. "Morphological Methods to Characterize Hydric Soils." In Methods in Biogeochemistry of Wetlands, 117–35. Madison, WI, USA: American Society of Agronomy and Soil Science Society of America, 2015. http://dx.doi.org/10.2136/sssabookser10.c8.

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Bell, J. C., and J. L. Richardson. "Aquic Conditions and Hydric Soil Indicators for Aquolls and Albolls." In Aquic Conditions and Hydric Soils: The Problem Soils, 23–40. Madison, WI, USA: Soil Science Society of America, 2015. http://dx.doi.org/10.2136/sssaspecpub50.c2.

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Jacob, J. S., R. W. Griffin, W. L. Miller, and L. R. Wilding. "Aquerts and Aquertic Soils: A Querulous Proposition." In Aquic Conditions and Hydric Soils: The Problem Soils, 61–77. Madison, WI, USA: Soil Science Society of America, 2015. http://dx.doi.org/10.2136/sssaspecpub50.c4.

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Boettinger, Janis L. "Aquisalids (Salorthids) and Other Wet Saline and Alkaline Soils: Problems Identifying Aquic Conditions and Hydric Soils." In Aquic Conditions and Hydric Soils: The Problem Soils, 79–97. Madison, WI, USA: Soil Science Society of America, 2015. http://dx.doi.org/10.2136/sssaspecpub50.c5.

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McDaniel, P. A., J. H. Huddleston, C. L. Ping, and S. L. McGeehan. "Aquic Conditions in Andisols of the Northwest USA." In Aquic Conditions and Hydric Soils: The Problem Soils, 99–111. Madison, WI, USA: Soil Science Society of America, 2015. http://dx.doi.org/10.2136/sssaspecpub50.c6.

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Conference papers on the topic "Hydric soils"

1

Grozav, Adia. "HYDRIC SOILS IN THE SOUTH WEST OF ROMANIA � ENZYMATIC ACTIVITY." In 17th International Multidisciplinary Scientific GeoConference SGEM2017. Stef92 Technology, 2017. http://dx.doi.org/10.5593/sgem2017/32/s13.037.

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Denchik, N., A. Rosselet, and D. Chapellier. "Development of a 3D Geoelectrical Monitoring System to Follow Hydric Behavior of Soils during Rainfalls." In Near Surface 2004 - 10th EAGE European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists & Engineers, 2004. http://dx.doi.org/10.3997/2214-4609-pdb.10.p042.

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Zhang, Xiong, and Jean-Louis Briaud. "Coupled Hydro-Mechanical Stress Soil-Structure Interaction Simulation." In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)181.

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Gatmiri, B., and H. Ghassemzadeh. "Thermo-Hydro-Chemo-Mechanical Coupling in Environmental Geomechanics." In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)214.

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Hoffmann, C., E. Romero, and E. E. Alonso. "Hydro-Mechanical Small-Scale Tests on Compacted Bentonite." In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)78.

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Wang, Xiao, Yongtu Liang, Shengli Liu, and Mengyu Wu. "Analysis of Products Pipeline Accident Infiltration Process in Surface Soil Condition." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93069.

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Abstract The most common way of transportation for refined oil is long-distance pipeline. Pipeline accidents occur frequently due to corrosion, equipment failure, external forces destruction. Aiming at predicting the contaminated area in soil caused by products pipeline accidents, this experimental study was conducted to examine the relationship between the light non-aqueous phase liquids (LNAPL) accumulative infiltrate volume and the time of infiltration process in homogeneous and layered soils. The soil’s hydraulic parameters were obtained by basic experiments and RETC software. Compared with traditional infiltration mathematical model, Green-Ampt model is the most common mathematical model to calculate the infiltration process in the unsaturated soil. In this study, a modified Green-Ampt model was developed to describe water and diesel infiltration through a 100-cm-long and layered soil column. In the modified Green-Ampt model, an infiltration reduction ratio was introduced to describe the effect of the hydraulic conductivity of the layered position. To evaluate the proposed method in the effect of the layers position infiltration permeability, eight constant water head layered column infiltration experiment were conducted to record the different infiltration fluid and different constant water head infiltration process. Compared the experiment results with traditional mathematical traditional Green-Ampt model (average R2 = 0.976) and Hydrus-1D software (average R2 = 0.988) The modified Green-Ampt model had relatively higher precision in accumulative infiltrate volume (average R2 = 0.992) and the wetting front velocity in infiltration process (average R2 = 0.997). Thus, the modified mathematical model was applied an effective upscaling scheme in layered formations. The experimental result also demonstrated that soil layering affected the infiltration process. With the increase of soil depth and density, the infiltration speed of the layered soil column decreased. Additionally, the infiltrate speed of wetting front decreases slowly at the layered surface. The experiment’s fitting results showed that the modified mathematical model about infiltrate time and liquid contaminant accumulative infiltrate volume, wetting front infiltrate velocity can highly effective approach to simulate water and light non-aqueous phase liquids (LNAPL) infiltration process in layered soils.

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Al-Dakheeli, Hussein, Rifat Bulut, Christopher R. Clarke, and James B. Nevels. "Hydro-Mechanical Analysis of Crack Initiation in Expansive Soils." In Second Pan-American Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481707.033.

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Abed, Ayman A., and Wojciech T. Sołowski. "Material Microstructure Effects in Thermo-Hydro-Mechanical Modelling of Bentonite." In Second Pan-American Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481684.034.

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Cordão Neto, M. P., and M. M. Farias. "Coupled hydro-Mechanical Analysis of the Construction of Earth Fills Compacted with Collapsible Soils." In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)198.

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Samat, Sergio. "Thermo-Hydro-Mechanical Modeling of a Shallow Foundation under Atmospheric Actions." In Second Pan-American Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481684.040.

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Reports on the topic "Hydric soils"

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Bleiler, John, Dave Pillard, David Barclift, Andy Hawkins, and Jason Speicher. Development of a Standardized Approach for Assessing Potential Risks to Amphibians Exposed to Sediment and Hydric Soils. Fort Belvoir, VA: Defense Technical Information Center, May 2004. http://dx.doi.org/10.21236/ada423345.

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Gillrich, Jennifer J., and Keith C. Bowman. The Use of Bryophytes as Indicators of Hydric Soils and Wetland Hydrology during Wetland Delineations in the United States. Fort Belvoir, VA: Defense Technical Information Center, September 2010. http://dx.doi.org/10.21236/ada536220.

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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, December 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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Litaor, Iggy, James Ippolito, Iris Zohar, and Michael Massey. Phosphorus capture recycling and utilization for sustainable agriculture using Al/organic composite water treatment residuals. United States Department of Agriculture, January 2015. http://dx.doi.org/10.32747/2015.7600037.bard.

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Objectives: 1) develop a thorough understanding of the sorption mechanisms of Pi and Po onto the Al/O- WTR; 2) determine the breakthrough range of the composite Al/O-WTR during P capturing from agro- wastewaters; and 3) critically evaluate the performance of the composite Al/O-WTR as a fertilizer using selected plants grown in lysimeters and test-field studies. Instead of lysimeters we used pots (Israel) and one- liter cone-tainers (USA). We conducted one field study but in spite of major pretreatments the soils still exhibited high enough P from previous experiments so no differences between control and P additions were noticeable. Due to time constrains the field study was discontinued. Background: Phosphorous, a non-renewable resource, has been applied extensively in fields to increase crop yield, yet consequently has increased the potential of waterway eutrophication. Our proposal impetus is the need to develop an innovative method of P capturing, recycling and reuse that will sustain agricultural productivity while concurrently reducing the level of P discharge from and to agricultural settings. Major Conclusions & Achievements: An innovative approach was developed for P removal from soil leachate, dairy wastewater (Israel), and swine effluents (USA) using Al-based water treatment residuals (Al- WTR) to create an organic-Al-WTR composite (Al/O-WTR), potentially capable of serving as a P fertilizer source. The Al-WTR removed 95% inorganic-P, 80% to 99.9% organic P, and over 60% dissolved organic carbon from the agro-industrial waste streams. Organic C accumulation on particles surfaces possibly enhanced weak P bonding and facilitated P desorption. Analysis by scanning electron microscope (SEM- EDS), indicated that P was sparsely sorbed on both calcic and Al (hydr)oxide surfaces. Sorption of P onto WW-Al/O-WTR was reversible due to weak Ca-P and Al-P bonds induced by the slight alkaline nature and in the presence of organic moieties. Synchrotron-based microfocused X-ray fluorescence (micro-XRF) spectrometry, bulk P K-edge X-ray absorption near edge structure spectroscopy (XANES), and P K-edge micro-XANES spectroscopy indicated that adsorption was the primary P retention mechanism in the Al- WTR materials. However, distinct apatite- or octocalciumphosphatelike P grains were also observed. Synchrotron micro-XRF mapping further suggested that exposure of the aggregate exteriors to wastewater caused P to diffuse into the porous Al-WTR aggregates. Organic P species were not explicitly identified via P K-edge XANES despite high organic matter content, suggesting that organic P may have been predominantly associated with mineral surfaces. In screen houses experiments (Israel) we showed that the highest additions of Al/O-WTR (5 and 7 g kg⁻¹) produced the highest lettuce (Lactuca sativa L. var. longifolial) yield. Lettuce yield and P concentration were similar across treatments, indicating that Al/O- WTR can provide sufficient P to perform similarly to common fertilizers. A greenhouse study (USA) was utilized to compare increasing rates of swine wastewater derived Al/O-WTR and inorganic P fertilizer (both applied at 33.6, 67.3, and 134.5 kg P₂O₅ ha⁻¹) to supply plant-available P to spring wheat (TriticumaestivumL.) in either sandy loam or sandy clay loam soil. Spring wheat straw and grain P uptake were comparable across all treatments in the sandy loam, while Al/O-WTR application to the sandy clay loam reduced straw and grain P uptake. The Al/O-WTR did not affect soil organic P concentrations, but did increase phosphatase activity in both soils; this suggests that Al/O-WTR application stimulated microorganisms and enhance the extent to which microbial communities can mineralize Al/O-WTR-bound organic P. Implications: Overall, results suggest that creating a new P fertilizer from Al-WTR and agro-industrial waste sources may be a feasible alternative to mining inorganic P fertilizer sources, while protecting the environment from unnecessary waste disposal.

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Tuller, Markus, Asher Bar-Tal, Hadar Heller, and Michal Amichai. Optimization of advanced greenhouse substrates based on physicochemical characterization, numerical simulations, and tomato growth experiments. United States Department of Agriculture, January 2014. http://dx.doi.org/10.32747/2014.7600009.bard.

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Over the last decade there has been a dramatic shift in global agricultural practice. The increase in human population, especially in underdeveloped arid and semiarid regions of the world, poses unprecedented challenges to production of an adequate and economically feasible food supply to undernourished populations. Furthermore, the increased living standard in many industrial countries has created a strong demand for high-quality, out-of-season vegetables and fruits as well as for ornamentals such as cut and potted flowers and bedding plants. As a response to these imminent challenges and demands and because of a ban on methyl bromide fumigation of horticultural field soils, soilless greenhouse production systems are regaining increased worldwide attention. Though there is considerable recent empirical and theoretical research devoted to specific issues related to control and management of soilless culture production systems, a comprehensive approach that quantitatively considers all relevant physicochemical processes within the growth substrates is lacking. Moreover, it is common practice to treat soilless growth systems as static, ignoring dynamic changes of important physicochemical and hydraulic properties due to root and microbial growth that require adaptation of management practices throughout the growth period. To overcome these shortcomings, the objectives of this project were to apply thorough physicochemical characterization of commonly used greenhouse substrates in conjunction with state-of-the-art numerical modeling (HYDRUS-3D, PARSWMS) to not only optimize management practices (i.e., irrigation frequency and rates, fertigation, container size and geometry, etc.), but to also “engineer” optimal substrates by mixing organic (e.g., coconut coir) and inorganic (e.g., perlite, pumice, etc.) base substrates and modifying relevant parameters such as the particle (aggregate) size distribution. To evaluate the proposed approach under commercial production conditions, characterization and modeling efforts were accompanied by greenhouse experiments with tomatoes. The project not only yielded novel insights regarding favorable physicochemical properties of advanced greenhouse substrates, but also provided critically needed tools for control and management of containerized soilless production systems to provide a stress-free rhizosphere environment for optimal yields, while conserving valuable production resources. Numerical modeling results provided a more scientifically sound basis for the design of commercial greenhouse production trials and selection of adequate plant-specific substrates, thereby alleviating the risk of costly mistrials.

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