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 20 for “"soil saturation"”.
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Modeling hydrologic processes associated with soil saturation and debris flow initiation during the September 2013 storm, Colorado Front Range
… slopes (SFS). A few previously-published soil moisture observations suggest that SFS were wetter than north-facing slopes (NFS) during the event, which would contrast with soil moisture patterns observed during dry conditions. Various causes have been hypothesized for the preferential …
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The application of Earth Observation for mapping soil saturation and the extent and distribution of artificial drainage on Irish farms
Artificial drainage is required to make wet soils productive for farming. However, drainage may have unintended environmental consequences, for example, through increased nutrient loss to surface waters or increased flood risk. It can also have implications for greenhouse gas emissions. Accurate …
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The effects of hydrology and vegetation on microbial community structure and soil function in the sediments of freshwater wetlands
In wetland soils, hydrology is considered to be one of the primary factors shaping wetland function and microbial community structure, but plant-soil interactions are also important mechanisms affecting microbial nutrient transformations. The research presented here considered the interactive …
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Development of a continuous, physically-based distributed parameter, nonpoint source model
… Green-Ampt infiltration equation. Soil evaporation and plant transpiration were modeled separately using the Ritchie equation. If soil moisture exceeds field capacity, the model computes percolation based on the degree of soil saturation. Nutrient losses include nitrate, …
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Interactions of <i>EXYRA RIDINGSII</i>, Riding's Pitcherplant Looper Moth and <i>SARRACENIA FLAVA </i>, the Yellow Pitcher Plant
… <em>Sarracenia flava </em>requires acidic, moist soil that undergoes frequent burns. 2. Habitat selection and the effects of fire as well as other habitat characteristics were examined for <em>E. ridingsii </em>during this study. 3. For this study, five sites in the Croatan National Forest were …
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Optimising oak woodland establishment into UK upland pastures in the context of climate change; and the role of oak woodland in soil hydrological recovery for natural flood management
… climate change (ACC) and coinciding with soil compaction leave downstream communities at elevated flood risk. The study examines changes in upland precipitation and the impact of upland ‘Atlantic’ oak (Quercus robur, Quercus petraea) woodland establishment on the recovery of soils for …
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Dissolved Organic Matter Sources from Soil Horizons with Varying Hydrology and Distance from Wetland Edge
… matter (carbon) that accumulates in wetland soils may be released into water, generating DOM. DOM is mobile and reactive, making it influential to aquatic metabolism and water quality. To understand the role of different soil horizons as potential sources of DOM, extractable soil organic …
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Predicting the effect of wetland restoration on phosphorus retention, Northwest Minnesota
… (P) into solution. Reducing conditions caused by soil flooding can release Fe-bound P, since ferrous Fe is more soluble than ferric Fe. Little is known concerning how the soils in the Red River Valley will be affected by wetland restoration. This research at the Judicial Ditch 66 watershed in …
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Landslide-pipeline interaction for onshore slopes in silty sand
… pipelines must be designed to withstand the soil forces created by landslides, among other geohazards. The quantification of soil forces on buried pipe, termed strain demand, can take the form of a simplified Winkler-beam style interaction, more commonly called soil-springs. Despite this …
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Effect of Anaerobic Soil Disinfestation on Salmonella Concentration Using Different Soil Amendments
Salmonella has been shown to survive in soils for extended periods. Anaerobic soil disinfestation (ASD) represents a promising alternative to fumigation used to manage soilborne diseases and pests; however, little is known about ASD's impact on Salmonella. The study aimed to compare Salmonella …
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Frequency analysis and two-dimensional simulations of extreme floods on a large watershed
… (4) conduct a sensitivity analysis for initial soil saturation, storm duration and area, and compare the flood frequency curve with gage and paleoflood data. A new channel mesh generator was developed to provide spatially-distributed channel geometry inputs to the TREX model. The channel …
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Enhancement of Floral Species Richness in Glaciated Prairie Temporary Wetlands
… removal of vegetation (mow); (3) disturbance of soil using a field disc (disc); (4) application of seed purchased from a seed vendor (purchased seed); and (5) application of seed collected locally (collected seed). The study consisted of 2 experiments, both randomized complete block designs. …
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The development of a methodology for the identification of potential wet grassland restoration sites in south west England
… landscape topography, catchment hydrology and soil physical characteristics, with the use of Geographical Information Systems. Landscape topography was expressed as the ln(a/tan^) topographic index, in which 'a' is the upslope area draining through the point for which the index is calculated …
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Distributed surface-subsurface modelling approach for evaluating the impact of rain gardens on steep terrain
… a peak reduction of around 65%. The response of soil saturation to rain garden allocation within the steep catchment varied considerably in some implementation scenarios. Subsurface flows and artificial retaining walls significantly affected the performance of distributed rain gardens in reducing …
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Atmospheric controls on soil moisture-boundary layer interactions
… structure affects the interaction between the soil moisture state and the growth and development of the boundary layer (BL), leading to the triggering of convection. It is concluded that in mid-latitudes, for matters of convective triggering and response to land surface conditions, the critical …
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Using targeted phenomics and environmental proxies to understand Phytophthora medicaginis and Phytophthora root rot resistance in Australian chickpea
… by Phytophthora root rot (PRR), caused by the soil-borne oomycete Phytophthora medicaginis. Yield penalties are exacerbated by waterlogging resulting in partial or complete crop losses with few control options. Higher levels of PRR resistance have been identified in wild Cicer species but are …
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Numerical study of solute transport in deformable soil liners
… Conventional methods of analysis assume that the soil is fully saturated. However, throughout much of the world unsaturation exists in landfill basal liner. Although a few investigations have treated the migration of VOCs in unsaturated soil liner, no deformation <br/>of liner due to mechanical …
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The role of soil moisture and weather patterns for flood occurrence and characteristics at the river basin scale
… River basin as an example, a classification of soil moisture, a key variable of pre-event conditions, is developed and a probabilistic link between patterns of soil moisture and flood occurrence is established. The soil moisture classification is applied to continuously simulated soil moisture …
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Late Quaternary landscape evolution and environmental change in Charwell Basin, South Island, New Zealand
… using terrain analysis, loess stratigraphy, soil chemistry and paleoecological data. The study contributes new understanding of New Zealand landscape and ecosystem responses to regional and global climatic change extending to Marine Isotope Stage (MIS) 6, and shows that climatically-forced …
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Wetland hydrology and soils as components of Virginia bog turtle (Glyptemys muhlenbergii) habitat
… used by bog turtles contain seepage areas and soil saturation that are characteristic of specific types of wetlands, suggesting that bog turtle rarity may in part be attributed to narrow habitat requirements. In this dissertation, I have sought to spatially and temporally characterize the …