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 19 of 19 for “"soil hydrology"”.
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Turning a problem into a solution: heterogeneities in soil hydrology
It is commonly recognized that soil moisture exhibits spatial heterogeneities occurring in a wide range of scales. These heterogeneities are caused by different factors ranging from soil structure at the plot scale to land use at the landscape scale. There is an urgent need for effi-cient …
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A coupled soil hydrology model and terrestrial ecology scheme for the MIT Integrated Global Systems Model
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2002.
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Effects of land-use practice on wetland soil hydrology, salinity, and biogeochemistry in the prairie pothole region
… SRW has higher potentials to sequester soil organic carbon (SOC) and can further impact greenhouse gas (GHG) emissions and extracellular enzyme activities (EEAs). In a field experiment, the effects of SRW were evaluated by measuring the depth to GWT; groundwater and soil electrical …
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Intercomparison of soil hydrology modules in the MIT Integrated Global System Model for analysis of climate issues
… model are due to deficient representation of soil moisture movement in its shallow soil column. The deep lower soil layer in the hydrological module in the Climate Model over-drains the thin upper soil layer; the dryness of the upper layer adversely affects energy partition at the …
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Environmental and Climatic Constraints on Large-scale Camelina Production in Eastern Arkansas
… the winter. Research analyzing climate data and soil hydrology is important to better understand the environmental and terrain conditions necessary for Camelina farming wherever it is proposed for large-scale production. This study focused on various conditions and constraints pertaining to the …
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A model to define hydrologic response units based on characteristics of the soil-vegetative complex within a drainage basin
… hydrologic response units and were a funtion of soil texture, soil depth, land use, and hydrology group classification. A computer model was developed to generate excess precipitation for each hydrologic response unit based on the Mein and Larson and Holtan infiltration equations. Data for …
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Assessment of irrigation use on crop yield and water supplies in the Midwestern U.S.
… physical processes, including evaporation from soil, and transpiration from plants. In order to investigate how climate variability impacts agricultural production, there are three hypotheses addressed in this dissertation. Hypothesis 1 is that the representation of changing wind speed will play …
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Hydrologic Regime and Soil Property Interactions in a Forested Peatland
… function such as increased fire vulnerability, soil oxidation, and altered vegetation composition. Peatland function is largely dependent on hydrologic regimes and their influences on the accumulation and properties of peat soil. Therefore, an understanding of soil-hydrology interactions is …
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Cosmic-ray neutron sensing and its applications to soil and land surface hydrology
… the consequences for weather and agriculture. As soil water storage plays a key role for partitioning of water fluxes between the atmosphere, biosphere, and lithosphere, measurement techniques are required to estimate soil moisture states from small to large scales. The method of cosmic-ray …
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Soil burn severity and climatic analysis of post-wildfire soil hydraulic properties from across the western continental United States
Rainfall infiltration into soil is a key factor in both landscape development and generation of rainfall-runoff hazards like flash flooding and debris flows in recently burned areas. However, infiltration capacity is spatially and temporally variable, which makes its prediction challenging, …
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BIOCHAR AMENDMENT TO IMPROVE SOIL PRODUCTIVITY WITH PARTICULAR EMPHASIS ON THE INFLUENCE OF SOIL TYPE
… of gasified biochar on contrasting temperate soil types in East Anglia, an agricultural area in eastern England, with a focus on the influence of soil properties. In a laboratory experiment comparing eight dissimilar soil types, adding up to 2.5% biochar improved field capacity by up to 42% …
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The Ecology and Evolution of Rare, Soil Specialist Astragalus Plants in the Arid Western U.S.
… breaking hard-seed dormancy. Through analysis of soil in seleniferous habitats, I found that soil hydrology can rapidly deplete bioavailable selenium, potentially further reducing the habitat available for accumulators. To better understand the relationship between soil bioavailable selenium and …
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AMINO ACIDS AS DIAGNOSTICS OF SOIL AND SOIL WATER QUALITY
… nitrogen and carbon exported from grassland soil is scarce. Evidence from the literature for other environments, suggests that determination of amino acid patterns of distribution may be a useful method for improved understanding of the interaction of microbial synthesis and degradation of …
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Livestock impact assessment and restoration strategies in the semi-arid Karoo
… One hypothesis is that small-scale changes in soil physical and chemical properties are responsible for the fine-scale patterning evident in winter-rainfall Succulent karoo ecosystems. Alternatively, these patterns could be the result of area-selective grazing by livestock. To evaluate these …
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Cosmic-ray neutron sensing for soil moisture measurements in cropped fields
… sensing (CRS) approach to measure field-scale soil moisture in cropped fields. Primary cosmic rays penetrate the top atmosphere and interact with atmospheric particles. Such interaction results on a cascade of high-energy neutrons, which continue traveling through the atmospheric column. …
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Spatial and temporal variability of the soil saturated hydraulic conductivity in gradients of disturbance
… on a key parameter of the hydrologic cycle, the soil saturated hydraulic conductivity (synonym: permeability; Ks from here on), because it is a sensitive indicator for soil disturbances. My general objective was to quantify the effects of the regional natural and human disturbances on the …
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Analysis of soil erodability and rainfall erosivity on the Soutpansberg Range, Limpopo Province, South Africa
Soil erosion is a global challenge that threatens ecological functionality. The need for better soil conservation practices keeps growing due to the twin challenges of climate change and population growth. However, effective soil erosion management solutions remain elusive to practitioners due to …
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Saturated hydraulic conductivity in the humid tropics : sources of variability, implications for monitoring and effects on near-surface hydrological flow paths
… water demand and by influencing key soil properties which determine hydrological flow paths. One of these key properties sensitive to land-use change is the saturated hydraulic conductivity (Ks) as it governs vertical percolation of water within the soil profile. Low values of Ks in a …
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Impacts of model-data uncertainties on biogeophysical-biogeochemical interactions in a land surface model (with an emphasis on the northern high-latitude regions)
… energy/water fluxes) and reservoirs (e.g., soil carbon stocks). In continuation from Chapter 2, I used the ISAM in Chapter 3 to extend the analysis for biases in ecosystem energy and water fluxes arising due to the use of the meteorological reanalysis of the NCEP/NCAR and the CRUNCEP. In …