Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"saturated soil"”.
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Air Injection Technique to Mitigate Liquefaction beneath Shallow Foundations
… technique has the potential to improve the soil supporting new and existing structures. There is, however, little research on its application and performance beneath existing shallow foundations. The aim of this research was to provide a comprehensive view of the air injection technique by …
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Finite element analysis of groundwater contamination
… and manner of travel of contaminants in the saturated soil of unconfined aquifers which may be pumped by of wells.
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The development of methods and equipment for the study of the aerating capabilities of a microdispersion of air in water
… environment. Hydrocarbon contamination of the subsoil and groundwater has become a major problem facing scientists and environmentalists in the 20th century. Initial treatment of contamination sites include the removal of the contaminant from the subsurface for subsequent above ground remediation. …
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Efficiency of soil aquifer treatment in the removal of wastewater contaminants and endocrine disruptors. A study on the removal of triclocarban and estrogens and the effect of chemical oxygen demand and hydraulic loading rates on the reduction of organics and nutrients in the unsaturated and saturated zones of the aquifer.
… was carried out to evaluate the performance of Soil Aquifer Treatment (SAT) under different loading regimes, using wastewater of much higher strength than usually encountered in SAT systems, and also to investigate the removal of the endocrine disruptors triclocarban (TCC), estrone (E1), …
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Field biology and mortality factors affecting Cassida rubiginosa Müller (Coleoptera: Chrysomelidae), a biological control agent of Canada thistle (Cirsium arvense (L.) Scop.)
… overwintering was not compatible with water saturated soil. The mean supercooling point of C. rubiginosa in summer was -5.2 ± 1.5°C and was significantly different (P<0.05) from mean supercooling points of -9.3 ± 2.1°C in fall and -8.8 ± 2.3°C in winter. Females studied individually produced …
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ALE and CEL formulations of pile installation in sand
… due to various factors including large soil deformation, non-linear behavior of soil, the potential influence of pore water, and high computation cost. This work presents a a sophisticated numerical model which addresses the aforementioned aspects. A key feature of the numerical model is …
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Slope Stability Of Laterite Soil Embankments
… such as dams, bridges, and roads. Residual soils are generally used as fills in the construction of embankments in areas were residual soils such as laterite is the dominant soil types. Laterite soils have the characteristics of losing its shear strength with time and in fully saturated …
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The undrained behavior of saturated, dilatant silts
… and dissolved gases exiting solution from soil pore water are the cause of the erratic undrained behavior often observed in triaxial tests on saturated, dilatant silts. The literature indicates that ground water contains various amounts of dissolved gases and that gases dissolved in soil …
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Finite element analysis of nitrogen species transport and transformation in the unsaturated zone
… species transport and transformation in variably saturated soil. In the finite element analysis various numerical algorithms were examined to evaluate methods of improving the efficiency of the traditional finite element approach. Results indicate that when undeformed linear rectangular elements …
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The Influence of Urban Soil Rehabilitation on Soil Carbon Dynamics, Greenhouse Gas Emission, and Stormwater Mitigation
… has resulted in rapidly increased urban land. Soils are the foundation that supports plant growth and human activities in urban areas. Furthermore, urban soils have potential to provide a carbon sink to mitigate greenhouse gas emission and climate change. However, typical urban land development …
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Permeability reduction in porous media due to suspended particles
… of the sand were calculated and compared with saturated soil properties at the start of the column test experiment. The results show that most of the carbon was captured in the first centimeter of the soil (69%) and hydraulic conductivity in this region was reduced up to 99%. About 98% of the …
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Landslide susceptibility mapping through enhanced dynamic slope stability analysis using earth observing satellite measurements
… regions. For most types of slope failure, soil moisture plays a critical role because increased pore water pressure reduces the soil strength and increases stress. The combined effect of soil moisture in unsaturated soil layers and pore water pressure in saturated soil layers is critical to …
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Symmetry methods applied to Richard's equations and problems of infiltration
… Richard's equation for water flow in an unsaturated uniform soil. The main theory of soil infiltration is introduced using a mathematical-physical approach to describe water movement in unsaturated soils. This gives rise to Richard's flow equation; which is presented for both unsaturated …
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Evaluation and Laboratory Measurement of the Coefficient of Permeability in Deformable, Unsaturated Soils
… the coefficient of permeability function for unsaturated soils. The research program commenced with a literature review on the coefficient of permeability function. The permeability function for a constant volume porous medium was categorized into empirical equations, macroscopic models and …
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Inorganic contaminant transport through unsaturated clay soil
… experimental studies have been conducted on the saturated soil by many researchers. The literature review emphasizes that the problem of the unsaturated transport of contaminants through porous media has received little attention. Thus, the present work is carried out to contribute to the study …
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An investigation into the use of plastic chips to reduce collapsibility in loess-like soils at Mount Moorosi Village, Lesotho
… of these cracks has been attributed to the local soil, which presents itself as an ideal building and founding material, while it may in fact be to the contrary. A previous investigation by Damane (2019), into the underlying soil profile of Mount Moorosi Village concluded that the village was …
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The contribution of manganese oxides to redox buffering in selected soils of the South African Highveld
… places great importance on inundation and saturated soil conditions. The use of redoximorphic features as a soil wetness indicator is widely practiced. The reduction of Fe3+ to Fe2+, resulting in the formation of these features, is particularly diagnostic for wetland soils. The problem …
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Fluvial sequence stratigraphy and paleoclimate of the Upper Triassic (Norian-Rhaetian) Chinle Strata, northern New Mexico.
… to climate-sensitive characteristics of modern soils, this study demonstrates that the Late Triassic Western Interior during the Late Norian to Rhaetian was arid to semiarid and supported a desert shrub environment that had localized and periodic moist or saturated soil conditions. Quantitative …
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Protection Covers for Trafficked Turf
… intensity, duration of covering, season and soil moisture were evaluated. Growth chambers and field experiments were conducted in 2010-2011. Tissue samples were taken in growth chambers experiments every four days over the 20-day period to analyze chlorophyll (Chl a, Chl b, Chl a+b) and …
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