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Littérature scientifique sur le sujet « Soils »

Auteur : Grafiati
Publié le 4 juin 2021
Mis à jour le 26 avril 2025

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Articles de revues sur le sujet "Soils"

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Hamad, Asal Mahmud, et Mahmood Gazey Jassam. « A Comparative Study for the Effect of Some Petroleum Products on the Engineering Properties of Gypseous Soils ». Tikrit Journal of Engineering Sciences 29, no 3 (15 octobre 2022) : 69. http://dx.doi.org/10.25130/tjes.29.3.7.

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Gypseous soils are considered problematic soils because the soil cavities happen during receiving the water or this type of soil and solving gypsum materials and contract in a soil volume. In this study, three types of gypseous soils are used; soil1, soil2, and soil3 with gypsum content (28.71%, 43.6%, and 54.88%) respectively, petroleum products (engine oil, fuel oil, and kerosene) are added to the soils with percentages (3%, 6%, 9%, and 12%) for each product. The result showed that specific gravity, liquid limit, optimum moisture content (O.M.C), and maximum dry density decreased with an increased percentage of product for all types of products. The direct shear (dry and soaked case) results show that increasing the (angle of internal friction and the soil cohesion) for soil1, soil2, and soil3 by adding engine oil and fuel oil. Still, when the soils were treated with kerosene, the angle of internal friction increased while cohesion decreased. The collapse potential for the treated soils increases with increasing gypsum content for all petroleum products. The collapse potential (CP) for (soil1) decreased by 47% when using 6% of the engine oil, 48.8% when using 9% of the fuel oil, and 55% when using 9% of the kerosene. The same percentage of the petroleum products (engine oil, fuel oil, and kerosene) decrease the collapse potential for (soil2), (47%, 46%, and 50%) respectively and decrease the collapse potential for (soil 3), (51%, 47.7%, and 52%) respectively. In the unconfined compressive test applied on (soil1) using maximum density, the results show that the soil strength increased (26% and 10%) when using 6% and engine oil and fuel oil, respectively, while the soil strength decreased by 29% when treated with 9% of kerosene.
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Mohamed, Ahmed, Saad Saadi, Ibrahim Gart et Fahmy Mohammed. « Assessing the Improvement of Geotechnical Properties of Clayey Soil Using a Substrate Cement Mortar Material, from Ilgin, Konya City, Turkey ». Iraqi Geological Journal 57, no 2A (31 juillet 2024) : 162–76. http://dx.doi.org/10.46717/igj.57.2a.12ms-2024-7-22.

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The increase in needs and the decrease in places with good, usable foundation soil have made the construction of engineering structures on problematic soils mandatory. Problematic soils generally do not have sufficient bearing capacity and soil strength, which may create an environment prone to high settlement or liquefaction. To investigate potential ways to enhance the compaction, undesirable or problematic plasticity, and soil’s strength characteristics, various geotechnical tests have been carried out on clayey soils and their mixtures treated with a Substrate Cement Mortar (0, 4, 8, and 12% by weight). These tests involved Atterberg limits, dry density, compaction, and shear strength. The obtained results show that the addition of substrate cement materials increased the dry density of soil treated with SCM, which can significantly enhance the soil properties. Meanwhile, adding SCM decreased the soil's plasticity limits. Furthermore, adding 12% Substrate Cement Mortar resulted in the lowest optimum moisture content and the maximum dry unit weight. Soil treated with 12% also exhibits maximum cohesion and shear strength. This research led to the conclusion that the utilization of Substrate Cement Mortar additive is an inexpensive product and has significantly improved the soil’s geotechnical parameters.
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Pahlevi Munirwan, Reza, et Munirwansyah Munirwansyah. « Assessing slope failure of soil erodibility problem by soil dispersive identification ». E3S Web of Conferences 340 (2022) : 01006. http://dx.doi.org/10.1051/e3sconf/202234001006.

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Dispersive soils are becoming a common building material. Due to their susceptibility to internal erosion and leakage, dispersive soils should only be used in combination with precise engineering measures to avoid catastrophic failures. Dispersive soils stabilization is critical and has been investigated in several studies conducted throughout the world. Erosion is a significant issue in structures built on sloping contours. As was the case with St. 670+250 Lipat Kajang road in Aceh Singkil. Soil erosion happens as a result of water’s dispersion and transport force. Dispersive soil is one of the factors that contribute to an increase in the soil erodibility index. The objective of this research is to develop a method for enhancing the soil’s dispersive qualities. In this investigation, specimens were prepared in three different soil mix plans (10%, 20%, and 30%) and then tested using a pinhole. The quantity of erodibility that happens in Sta. 670 + 250 Lipat Kajang - Aceh Singkil Regency is based on the results of testing the soil's dispersive properties because the soil in this area is highly dispersive.
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Cui, Jifei, Yanhao Jin, Yingjie Jing et Yu Lu. « Elastoplastic Solution of Cylindrical Cavity Expansion in Unsaturated Offshore Island Soil Considering Anisotropy ». Journal of Marine Science and Engineering 12, no 2 (9 février 2024) : 308. http://dx.doi.org/10.3390/jmse12020308.

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An elastoplastic analysis scheme for the cylindrical cavity expansion in offshore islands unsaturated soils considering anisotropy is established. The hydraulic properties and anisotropy caused by stress of unsaturated soils are coupled in an elastoplastic constitutive matrix for unsaturated soil to obtain the governing equations for the cylindrical cavity expansion problem, with an analytical solution that utilizes the original hydro-mechanical state of the soil as the initial conditions. Through a comparative analysis with other analytical solutions, the effectiveness of the new solution is verified. Moreover, the swelling response of the cylindrical cavity expansion in unsaturated soils is examined by systematically analyzing different parameters of the surrounding soil. The findings reveal that the development and rate of anisotropy in normal consolidated soil and over-consolidated soil exert a significant impact on the soil’s mechanical characteristics. Nevertheless, the alteration in the model constant h has little effect on the soil’s mechanical characteristics. The analytical solution introduces anisotropy and broadens the expansion theory of unsaturated soils to yield a more comprehensive theoretical framework for the comprehensive analysis of offshore islands’ unsaturated soils.
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Ngole-Jeme, Veronica M. « Fire-Induced Changes in Soil and Implications on Soil Sorption Capacity and Remediation Methods ». Applied Sciences 9, no 17 (21 août 2019) : 3447. http://dx.doi.org/10.3390/app9173447.

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Vegetation changes caused by fire events are visible instantly but changes in soils are less apparent, and could be short-term, long-term or permanent in nature. Research has shown that soils undergo changes in their mineralogical, geochemical, physico-chemical and biological properties after a fire event that may vary depending on the intensity and duration of the fire, and the properties of the soil. Some of these properties make significant contributions towards soil’s ability to sorb contaminants. Changes in these properties could affect soil sorption complex and the effectiveness of remediation methods used to clean these soils when contaminated. This review synthesizes available information on fire-induced changes in soil properties affecting soil sorption and the factors which dictate these changes. The implications of changes in these properties on the soil’s natural attenuation capacity and choice of remediation method to clean up fire-affected contaminated soils are also discussed.
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Najafi-Ghiri, M., et A. Abtahi. « Potassium fixation in soil size fractions of arid soils ». Soil and Water Research 8, No. 2 (15 mai 2013) : 49–55. http://dx.doi.org/10.17221/52/2012-swr.

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Amounts of potassium (K) fixed in soil fractions of 10 calcareous soils of southern Iran were measured to evaluate the contributions of different soil size fractions to K fixation. Soil particles were fractionated after dispersion of the soils with an ultrasonic probe. Potassium fixation analysis was done by addition of 1000 mg K/kg samples. Mineralogy of the size fractions was determined by X-ray diffraction. The clay fractions were dominated by smectite, chlorite, mica, and palygorskite. Potassium fixation capacities ranged from 104 to 148 mg/kg for clay, from 102 to 155 mg/kg for silt, and from 96 to 187 mg/kg for sand fractions. A positive and significant relationship (P < 0.05) was obtained between K fixation capacity and smectite content for the clay fractions. High amounts of K fixed in the sand fraction may be explained by a larger diffusion path of fixed K out of the frayed edges of micaceous and smectitic minerals into the extracting solution, low cation exchange capacity (CEC) of the coarse fraction and thereby the high concentration gradient along solution and interlayers, physical entrapment of K ions in coarse aggregates cemented by carbonates, and by the presence of clay particles in coarse fractions due to incomplete dispersion of coarse aggregates.
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Sturman, V. I., et A. N. Loginovskaya. « BACKGROUND CONCENTRATION OF HEAVY METALS (LEAD, CADMIUM, ZINC, COPPER, NICKEL, ARSENIC, MERCURY) IN SURFACE SOILS OF UDMURTIA CONTROLLED AT ENGINEERING-ECOLOGICAL RESEARCHES ». Bulletin of Udmurt University. Series Biology. Earth Sciences 30, no 3 (29 octobre 2020) : 285–94. http://dx.doi.org/10.35634/2412-9518-2020-30-3-285-294.

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Materials of engineering-ecological researches on various economic objects in Udmurtia are processed and systematized. Average (background) concentration of the heavy metals which are subject to obligatory control at engineering-ecological researches (lead, cadmium, zinc, copper, nickel, arsenic, mercury) for the main associations of soils and most wide-distributed kinds of soils are defined. It is revealed that with decreasing the soil’s podzol content and increasing the soil’s clay content, concentrations of heavy metals naturally raise. In general, similar soils are characterized by similar concentrations of heavy metals and similar ratios of concentration. It is established that excesses of hygienic standards on such elements as nickel, arsenic and to a lesser extent zinc, copper and cadmium, are not only something exclusive in Udmurtia, but also spreading more and more widely, especially in soils of light structure. The received average concentration can be accepted as background one at the subsequent engineering-ecological researches in the region.
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Islam, ABMS, ZH Khan et AR Mazumder. « Pedogenesis And Characterization Of Some Soils From The Chalan Beel Of Bangladesh ». Journal of the Asiatic Society of Bangladesh, Science 40, no 2 (30 décembre 2014) : 271–81. http://dx.doi.org/10.3329/jasbs.v40i2.46025.

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Twenty two soil samples from four pedons representing some established soil series namely Jaonia, Haiti, Taras and Digli from the Chalan beel area of Bangladesh were studied in the field as well as in the laboratory for their pedogenesis and characterization. All the soils are heavy textured with clay contents ranging from 47 to 60 percent. The soils are moderately acidic to neutral in reaction with high base saturation. The soils have developed redoximorphic features including redox concentration and redox depletion due to periodic flooding more than 4 months in the monsoon season. Development of cambic horizon in these soils is the most notable morphogenetic feature. Gleization and weak hydromorphism are the dominant pedogenic processes. At the subgroup level the soiis were classified as Typic Endoaquepts and Aerie Endoaquepts. Finally the soiis are characterized at the family level of soil taxonomy. Asiat. Soc. Bangladesh, Sci. 40(2): 271-281, December 2014
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Meier, E. A., P. J. Thorburn et M. E. Probert. « Occurrence and simulation of nitrification in two contrasting sugarcane soils from the Australian wet tropics ». Soil Research 44, no 1 (2006) : 1. http://dx.doi.org/10.1071/sr05004.

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The concentration of ammonium-nitrogen (NH4+-N) frequently exceeds that of nitrate-N (NO3−-N) in Australian wet tropical sugarcane soils. The amount of mineral N in soil is the net result of complex processes in the field, so the objective of this experiment was to investigate nitrification and ammonification in these soils under laboratory conditions. Aerobic and saturated incubations were performed for 1 week on 2 wet tropical soils. Net NO3−-N increased significantly in both soils during both types of incubation. A second series of aerobic incubations of these soils treated with NH4+-N and inoculated with subtropical nitrifying soils was conducted for 48 days. Nitrification in the wet tropical soils was not significantly affected by inoculation, and virtually all added N was nitrified during the incubation period. Mineral N behaviour of the 48-day incubations was captured with the APSIM-SoilN model. As nitrification proceeded under laboratory conditions and was able to be captured by the model, it was concluded that nitrification processes in the wet tropical soils studied were not different from those in the subtropical soils. Processes that remove NO3− from the soil, such as leaching and denitrification, may therefore be important factors affecting the proportions of NH4+-N and NO3−-N measured under field conditions.
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Lai, Yongbiao, Songsong Bai, Jian Hou, Zongqing Zhou, Qiangling Wu, Xiaobo Lv, Liming Yang, Weixun Cao et Zhengtao Ren. « A Synthetic Chart for Internal Stability Assessment of Soils Based on Soil PSD Curves ». Processes 10, no 5 (20 avril 2022) : 807. http://dx.doi.org/10.3390/pr10050807.

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Awareness of granulated soils’ internal instability is an important parameter when designing granulated filters, and the ability of a granulated soil’s internal stability can be verified using the soil PSD (Particle Size Distribution) curves’ secant slopes. The current work presents a new method to calculate the soil PSD curves’ secant slopes automatically, and a synthetic diagram is presented for the potential examination of the granulated soils’ internal stability. To verify the feasibility and accuracy of this synthetic diagram, 80 specimens of soil were investigated in this work and categorized into two groups: 50 sand–gravel soils and 30 (clay)–silt–sand–gravel soils. The obtained conclusions indicate that the internal stability and instability potentials of sand–gravel soils can be distinguished successfully with a synthetic chart and the Kenney and Lau criterion but cannot be assessed with the Kezdi and Sherard criteria. None of the criteria studied here can be used for the internal stability assessment of silt–sand–gravel and clay–silt–sand–gravel soils.
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Thèses sur le sujet "Soils"

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Robert, Dilan Jeyachandran. « Soil-pipeline interaction in unsaturated soils ». Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/265508.

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Pipelines that are used for the transport of energy and services are very important lifelines to modem society. Though pipelines are generally buried in unsaturated soils, the design guidelines are based on the assumption that the soil is either dry or fully saturated. For certain geotechnical problems, this assumption may not be acceptable because the water meniscus formed between soil particles creates an additional normal force between them by suction, which in turn forms temporary bonds. A recent series of large-scale physical model experiments at the Pipeline Engineering Research Laboratory (PERL) of Tokyo Gas, Japan show a higher peak load under unsaturated conditions compared to dry conditions. In contrast, recent experiments performed at Cornell University (CU) show that the soil-load due to lateral pipeline movement in dry and unsaturated sands are virtually the same. Thus, the effect of partial saturation on soil loading to pipeline may be different depending on soil type, moisture content and density. The current study investigates this problem through triaxial testing and constitutive modelling of the unsaturated soils used for the experiments and finite element simulations of the experiments. The mechanical behaviour of the sands used in the physical model experiments has been investigated by conducting a series of laboratory experiments. When compacted to the same energy level, Tokyo Gas sand exhibits larger strength in unsaturated conditions than in dry conditions at low confining stress levels mainly due to the suction-induced apparent cohesion generated by the fine particles present in the sand. In contrast, for coarser Cornell sand, the suction effect is found to be small even at low confining stress level, and hence the strength in unsaturated conditions is similar to that in dry ( or fully saturated) conditions. To capture the observed behaviour of dry as well as unsaturated soils, advanced constitutive soil models were developed. For dry (or fully saturated) soils, the modified Mohr-Coulomb and Original Nor-Sand (Cheong, 2006) models were able to simulate the general behaviour including the strain softening effect. To cater for the behaviour of unsaturated soils, the saturated versions of the NorSand and the modified Mohr-Coulomb models were modified in conjunction with the generalised effective stress framework. By simulating the triaxial experimental data, it is demonstrated that the developed models can predict the realistic soil behaviour of unsaturated soils. Using the developed models, the large scale physical model experiments of pipelines subjected to lateral soil movements at PERL and CU were simulated by the explicit finite element method. Good agreement was found between the numerical models and the experiments. Further FE analyses were conducted to investigate the pipeline behaviour under lateral soil movement at conditions of different HID's, moisture contents, and relative densities. The results were synthesized to produce new normalised pipe load charts. Three dimensional finite element analysis was performed to simulate the soil-pipeline interaction under strike-slip fault movements. The finite element model was first validated by comparing the computed results to the data produced from a full scale experiment carried out at CU. The analysis was then further extended by varying the initial conditions of the sand (sand type, density, moisture content, etc.), pipe material, pipe burial depth, and pipeline-fault rupture inclination. It was found in all cases that the peak lateral loads on the pipelines subjected to strike-slip fault movements are less than or equal to the peak loads computed by the 2-D lateral movement simulations.
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Ekanayake, Jagath C. « Soil water movement through swelling soils ». Lincoln University, 1990. http://hdl.handle.net/10182/1761.

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The present work is a contribution to description and understanding of the distribution and movement of water in swelling soils. In order to investigate the moisture distribution in swelling soils a detailed knowledge of volume change properties, flow characteristics and total potential of water in the soil is essential. Therefore, a possible volume change mechanism is first described by dividing the swelling soils into four categories and volume change of a swelling soil is measured under different overburden pressures. The measured and calculated (from volume change data) overburden potential components are used to check the validity of the derivation of a load factor, ∝. Moisture diffusivity in swelling soil under different overburden pressures is measured using Gardner's (1956) outflow method. Behaviour of equilibrium moisture profiles in swelling soils is theoretically explained, solving the differential equation by considering the physical variation of individual soil properties with moisture content and overburden pressure. Using the measured volume change data and moisture potentials under various overburden pressures, the behaviour of possible moisture profiles are described at equilibrium and under steady vertical flows in swelling soils. It is shown that high overburden pressures lead to soil water behaviour quite different from any previously reported.
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Stinghen, Geovanne Silva. « Assessment of nitrogen efficiency in maize due to soil compaction and changes in soil physical properties / ». free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1422967.

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Njie, Momodou. « Modelling soil moisture dynamics in vegetated soils ». Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406159.

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Dash, Suresh R. « Lateral pile soil interaction in liquefiable soils ». Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543468.

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Dickey, Juliana Sloan. « The effects of selected nitrogen and sulfur applications on soil pH, water soluble sulfate, DTPA extractable iron, manganese, copper and zinc on selected Arizona soils ». Thesis, The University of Arizona, 1985. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_1985_190_sip1_w.pdf&type=application/pdf.

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Young, Fred J. « Spatial variability of soil properties within a loess-covered, upland landscape / ». free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9823319.

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Barzegar, Abdolrahman. « Structural stability and mechanical strength of salt-affected soils ». Title page, contents and abstract only, 1995. http://web4.library.adelaide.edu.au/theses/09PH/09phb296.pdf.

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Copies of author's previously published articles in pocket inside back cover. Bibliography: leaves 147-160. This thesis outlines the factors affecting soil strength and structural stability and their interrelationship in salt-affected soils. The objectives of this study are to investigate the influence of clay particles on soil densification and mellowing, the mellowing of compacted soils and soil aggregates as influenced by solution composition, the disaggregation of soils subjected to different sodicities and salinities and its relationship to soil strength and dispersible clay and the effect of organic matter and clay type on aggregation of salt-affected soils.
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Thakali, Sagar. « Terrestrial biotic ligand model (TBLM) for copper, and nickel toxicities to plants, invertebrates, and microbes in soils ». Access to citation, abstract and download form provided by ProQuest Information and Learning Company ; downloadable PDF file 2.00 Mb., 340 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3221133.

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Nelson, Paul Netelenbos. « Organic matter in sodic soils : its nature, decomposition and influence on clay dispersion ». Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phn4281.pdf.

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Bibliography: leaves 147-170. Aims to determine the influence of sodicity on the nature and decomposition of organic matter; and the influence of organic matter and its components on the structural stability of sodic soils.
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Livres sur le sujet "Soils"

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Natural History Museum (London, England), dir. Soils. London : The Natural History Museum, 2001.

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Bridges, E. M. World soils. 2e éd. Cambridge : Cambridge University Press, 1990.

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Troeh, Frederick R. Soils and soil fertility. 5e éd. New York : Oxford University Press, 1993.

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M, Thompson Louis, dir. Soils and soil fertility. 6e éd. Ames, Iowa : Blackwell Pub., 2005.

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A, McKeague J., Canada. Agriculture Canada. Research Branch. et Land Resource Research Institute (Canada), dir. Concepts and classification of Gleysolic soils in Canada. Ottawa : Agriculture Canada, Research Branch, 1986.

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Paul, Bowles John, Pesch Barbara B et Brooklyn Botanic Garden, dir. Soils. Brooklyn, N.Y : Brooklyn Botanic Garden, 1986.

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Fredlund, D. G., et H. Rahardjo. Soil Mechanics for Unsaturated Soils. Hoboken, NJ, USA : John Wiley & Sons, Inc., 1993. http://dx.doi.org/10.1002/9780470172759.

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E, Alley Darrell, Forestry Sciences Laboratory (Columbia, Mo.) et United States Forest Service, dir. Soil sampler for rocky soils. [Columbia, Mo.?] : U.S. Dept. of Agriculture, Forest Service, North Carolina Forest Experiment Station, 1997.

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H, Rahardjo, dir. Soil mechanics for unsaturated soils. New York : Wiley, 1993.

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Stathers, Robert John. Forest soil temperature manual. [Victoria, B.C.] : Canada/BC Economic & Regional Development Agreement, 1990.

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Chapitres de livres sur le sujet "Soils"

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Castilho, Pierre del, et Rainer Breder. « Soils and Soil Solutions ». Dans Sampling and Sample Preparation, 43–56. Berlin, Heidelberg : Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60632-8_5.

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McGrath, Timothy J. « Soils and soil models ». Dans Analysis and Design of Gravity Flow Conduits and Buried Bridges, 50–77. New York : CRC Press, 2024. https://doi.org/10.1201/9780429162619-4.

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Bridget Gleeson, Deirdre. « Soil Biological Processes in Urban Soils ». Dans Urban Soils, 243–91. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-87316-5_8.

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Tedrow, J. C. F., et F. C. Ugolini. « Antarctic Soils ». Dans Antarctic Soils and Soil Forming Processes, 161–77. Washington, D. C. : American Geophysical Union, 2013. http://dx.doi.org/10.1029/ar008p0161.

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Holliday, Vance T., Rolfe D. Mandel et E. Arthur Bettis. « Soils ». Dans Encyclopedia of Geoarchaeology, 862–77. Dordrecht : Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-1-4020-4409-0_173.

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Nicu, Ionut Cristi. « Soils ». Dans Hydrogeomorphic Risk Analysis Affecting Chalcolithic Archaeological Sites from Valea Oii (Bahlui) Watershed, Northeastern Romania, 39–43. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-25709-9_8.

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Othieno, C. O. « Soils ». Dans Tea, 137–72. Dordrecht : Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2326-6_5.

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Lehmann, Johannes. « Soils ». Dans Encyclopedia of Earth Sciences Series, 1–6. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39193-9_192-1.

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Lehmann, Johannes. « Soils ». Dans Encyclopedia of Earth Sciences Series, 1347–52. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-39312-4_192.

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Delvaux, B. « Soils ». Dans Bananas and Plantains, 230–57. Dordrecht : Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0737-2_10.

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Actes de conférences sur le sujet "Soils"

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Shishkov, Toma, Emil Dimitrov et Ekaterina Filchev. « FOREST SOILS FROM SREDNA GORA MOUNTAIN IN BULGARIA ». Dans 24th SGEM International Multidisciplinary Scientific GeoConference 2024, 237–44. STEF92 Technology, 2024. https://doi.org/10.5593/sgem2024/3.1/s13.29.

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The soils from the central part of Sredna Gora Mountain in Bulgaria were studied aiming to establish the occurrence of contemporal soil forming processes occured in the forest ecosystem. Soils were analyzed to determine the carbon content, the soil organic matter composition and the total soil acidity. The precise soil classification based on the detail morphological diagnostic was carried out. The ecological conditions in forest ecosystem determine the mode of humic substances in the studies soils. Soils are characterized with low degree of humification and considerable amount of organic matter only on the soil surface. Generally, large proportion of absorbed nutrients is returned annually to the soil and is reabsorbed after biological breakdown of litter. Forest soils considerably differ by the soil organic matter (SOM) composition. The quantity and quality of humic substances is linked to the important soil functions. Humic acids are mainly in the upper part in the first soil and fulvic acids dominated in the lower part of profile. Humic acids in the second soil are bounded with calcium and composing humic type of humus. In the shallow soil, formed on the hard rock, the fulvic acids dominate that composing the fulvic type of humus. In the studied forest ecosystem the advanced natural soil acidification occurs mainly in the most upper part of soils.
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Grigorova-Pesheva, Bilyana, Boyka Malcheva et Biser Hristov. « SEASONAL DYNAMICS IN THE MICROBIOLOGICAL STATUS OF FOREST SOILS FROM THE TERRITORY OF VITOSHA NATURE PARK ». Dans 24th SGEM International Multidisciplinary Scientific GeoConference 2024, 285–92. STEF92 Technology, 2024. https://doi.org/10.5593/sgem2024/3.1/s13.35.

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The health, richness, and variety of microbial life in soil represent basic indicators for the evaluation and surveillance of forest ecosystem vitality. The vital role these microorganisms occupy in forest ecosystems underscores the necessity to in-depth assess and monitor their populations within soil habitats. Aiming to deepen our comprehension of microbial communities across different soils and soils horizons, we conducted an investigation of 22 soil profiles situated within the territory of Vitosha Nature Park. The investigation was carried out in one year period. We took samples from each of the studied soils during each of the seasons - spring, summer, autumn and winter. The following soil parameters were evaluated - pH, total nitrogen and humus for each soil horizon. From the microbiological indicators, the amounts of the main microbiological groups (non-spore-forming bacteria, bacilli, microscopic fungi and actinomycetes) were analyzed. Based on these data, the biogenicity of the soil was determined, as well as the percentage participation of individual groups compared to the total microbial number. Two clear peaks in the biogenicity of the studied soils were found - in spring and autumn. The dynamics of microorganisms in relation to change in altitude was reported. There is a correlation between the pH of the medium and the amount of microscopic fungi. Soils under broad-leaved vegetation stand out with higher biogenicity than soils under coniferous vegetation, in all seasons except winter.
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Khan, Naeem A. « Use of ER Soil Corrosion Probes to Determine the Effectiveness of Cathodic Protection ». Dans CORROSION 2002, 1–12. NACE International, 2002. https://doi.org/10.5006/c2002-02104.

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Abstract The use of soil corrosion probes to determine actual corrosion rates can assist in determining the effectiveness of cathodic protection (CP) in high resistivity soils. This technique is useful in situations where poor reference cell soil contact in very dry soils results in erroneous CP potential measurements. This paper presents the results of an on-going study evaluating the use of soil corrosion probes as an alternative monitoring tool to determine the effectiveness of CP in the dry desert soils of Saudi Arabia.
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Valujeva, Kristine, Jovita Pilecka-Ulcugaceva, Kristaps Siltumens, Olga Skiste et Inga Grinfelde. « TEMPORAL VARIATIONS IN GREENHOUSE GAS EMISSIONS FROM AGRICULTURAL SOILS ». Dans 24th SGEM International Multidisciplinary Scientific GeoConference 2024, 321–28. STEF92 Technology, 2024. https://doi.org/10.5593/sgem2024/3.1/s13.39.

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Soil moisture, soil temperature, nutrient availability, and land use practices affect the GHG emissions from soils. In this study, the aim is to determine and analyse GHG emissions from agricultural soils in five monitoring sites. The mobile spectrophotometer Picarro G2508 is used for the quantification of N2O, CH4, and CO2 soil flux across five monitoring sites used for agricultural production during the growing seasons from 2017 to 2023. Findings reveal significant variations in GHG emissions across the monitoring sites. Specifically, the average N2O emissions at monitoring sites used form agricultural production varied from 3.73 to 46.54 g N2O ha-1 day-1, while the average CO2 emissions ranged from 65.75 to 166.08 kg CO2 ha-1 day-1, and CH4 assimilation ranged from 1.50 to 5.30 g CH4 ha-1 day-1. Meteorological conditions exert a considerable effect on soil microbiological activity within a growing season, further impacting GHG emissions. These findings highlight the complex interplay between soil dynamics, environmental factors, and GHG emissions in agricultural systems. This study contributes valuable insights into the understanding of GHG emissions from agricultural soils, providing essential information for policymakers, land managers, and stakeholders involved in developing sustainable agricultural practices and mitigating climate change.
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Kaminski, Pauline, Jürgen Grabe et Zeest Fatima. « Miniaturised Testing Device for the Qualitative Analysis of Gas Exsolution in Soil ». Dans ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/omae2023-101605.

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Abstract The presence of gas is a widespread phenomenon in marine and coastal soils, often accompanied by complications in engineering application. The characteristics of the gas phase in the pore space are relevant for the assessment of the soil mechanical implications. In granular soils the formation of capillary bridges between the soil particles can invoke cohesive forces. In fine-grained soils gas-induced fractures may weaken the soil structure. Additionally, an excessive gas production leads to a build-up of pore pressures and can thereby trigger a liquefaction failure in granular soils. To enable a differentiated investigation of these features, however, it is vital to look into the inner pore space of a gassy soil. For this purpose, a miniaturised experimental set-up was developed which allows for the documentation of gas bubble nucleation and growth in a soil’s pore space by means of the imaging technique X-ray computed tomography. Herein, gassy soil samples with a stationary grain structure are obtained by means of the axis-translation technique. The degree of saturation is adjusted by a controlled pressure relief. During image processing the three phases — soil particles, pore water and gas — are identified and thus, their interaction can be studied. The microscopic insights gained with the help of this experimental set-up will allow validation or falsification of the basic theoretical assumptions on gassy soils. Furthermore, the data bears great potential for the advancement of approaches for multiphase simulation.
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Pospisilova, Lubica. « APPLICATION OF SOIL CONDITIONERS IN SANDY SOILS ». Dans 15th International Multidisciplinary Scientific GeoConference SGEM2015. Stef92 Technology, 2011. http://dx.doi.org/10.5593/sgem2015/b32/s13.005.

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Andromalos, Kenneth B., Yasser A. Hegazy et Brian H. Jasperse. « Stabilization of Soft Soils by Soil Mixing ». Dans Soft Ground Technology Conference. Reston, VA : American Society of Civil Engineers, 2001. http://dx.doi.org/10.1061/40552(301)16.

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Zou, L., et E. C. Leong. « Soils with Bimodal Soil-Water Characteristic Curve ». Dans Second Pan-American Conference on Unsaturated Soils. Reston, VA : American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481684.006.

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Bean, E. Z., et M. D. Dukes. « Soil Amendments for Mitigation of Compacted Soils ». Dans Low Impact Development International Conference (LID) 2010. Reston, VA : American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41099(367)66.

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Drnevich, Vincent P., Carlos E. Zambrano, Sochan Jung et Julia P. Clarke. « Electrical Conductivity of Soils and Soil Properties ». Dans GeoCongress 2008. Reston, VA : American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/40972(311)40.

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Rapports d'organisations sur le sujet "Soils"

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Ponder, Felix Jr, et Darrell E. Alley. Soil sampler for rocky soils. St. Paul, MN : U.S. Department of Agriculture, Forest Service, North Central Research Station, 1997. http://dx.doi.org/10.2737/nc-rn-371.

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Tresise, Megan, et Jonathan Wentworth. Restoring agricultural soils. Parliamentary Office of Science and Technology, janvier 2022. http://dx.doi.org/10.58248/pn662.

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Changes to the management of agricultural soil could contribute to improving the ability of soils to produce crops, as well as to wider benefits including mitigating future climate change. This POSTnote summarises the state of England’s agricultural soils and evaluates soil stewardship opportunities. Soil indicators that could be used for monitoring in policy frameworks and incentives relating to soil restoration are explored.
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Gombert, D. II. Evaluation of soil washing for radiologically contaminated soils. Office of Scientific and Technical Information (OSTI), mars 1994. http://dx.doi.org/10.2172/10163686.

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Cunnane, J. C., V. R. Gill, S. Y. Lee, D. E. Morris, M. D. Nickelson, D. L. Perry et V. C. Tidwell. Uranium soils integrated demonstration : Soil characterization project report. Office of Scientific and Technical Information (OSTI), août 1993. http://dx.doi.org/10.2172/10180428.

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Fenton, Thomas, et Gerald Miller. Iowa Soils. Ames : Iowa State University, Digital Repository, 2016. http://dx.doi.org/10.31274/farmprogressreports-180814-1378.

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Fenton, Thomas, et Gerald Miller. Iowa Soils. Ames : Iowa State University, Digital Repository, 2016. http://dx.doi.org/10.31274/farmprogressreports-180814-1382.

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Fenton, Thomas, et Gerald Miller. Iowa Soils. Ames : Iowa State University, Digital Repository, 2016. http://dx.doi.org/10.31274/farmprogressreports-180814-1387.

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Fenton, Thomas, et Gerald Miller. Iowa Soils. Ames : Iowa State University, Digital Repository, 2016. http://dx.doi.org/10.31274/farmprogressreports-180814-1398.

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Fenton, Thomas, et Gerald Miller. Iowa Soils. Ames : Iowa State University, Digital Repository, 2016. http://dx.doi.org/10.31274/farmprogressreports-180814-1404.

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Fenton, Thomas, et Gerald Miller. Iowa Soils. Ames : Iowa State University, Digital Repository, 2016. http://dx.doi.org/10.31274/farmprogressreports-180814-1424.

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