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The effect of algal-mold crusts on the hydrologic processes of infiltration, runoff, and soil erosion under simulated conditionsFaust, William Franklin, January 1970 (has links) (PDF)
Thesis (M.S. - Watershed Management)--University of Arizona. / Includes bibliographical references.
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Gullies and sediment delivery at Caspar Creek, Mendocino County, California /Dewey, Nicholas J. January 1900 (has links)
Thesis (M.S.)--Humboldt State University, 2007. / Includes bibliographical references (leaves 100-103). Also available via Humboldt Digital Scholar.
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Modeling sediment movement in forested watersheds using hill-slope attributesHamons, Gregory W. January 2007 (has links)
Thesis (M.S.)--West Virginia University, 2007. / Title from document title page. Document formatted into pages; contains viii, 122 p. : ill., maps. Includes abstract. Includes bibliographical references (p. 78-85).
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Digital terrain modelling of catchment erosion and sedimentation /Sun, Hua. January 1998 (has links) (PDF)
Thesis (Ph.D.)--University of Adelaide, Dept. of Civil and Environmental Engineering, 1999? / Corrigenda pasted onto front end-paper. Bibliography: leaves 307-326.
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Studies on interrill sediment delivery and rainfall kinetic energy /Rezaur, Rahman Bhuiyan. January 1999 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2000. / Includes bibliographical references (leaves 127-140).
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Studies on interrill sediment delivery and rainfall kinetic energyRezaur, Rahman Bhuiyan. January 1999 (has links)
Thesis (Ph.D.)--University of Hong Kong, 2000. / Includes bibliographical references (leaves 127-140) Also available in print.
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Erosion selectivity as affected by tillage-planting systemsSinukaban, Naik. January 1981 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1981. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 87-95).
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The impacts of biochar application on soil hydrology, erosion and related propertiesAston, Stephen January 2014 (has links)
Biochar production and application to soil can mitigate climate change and improve soil quality. This thesis investigated the influence of biochar preparation methods and application rates on the hydrological and erosional characteristics of biochars themselves and the soils to which they were applied. Biochar hydrophobicity was influenced by feedstock and decreased with increasing highest treatment temperature (HTT). Biochar did not influence soil wettability and the effect of HTT on biochar porosity was more important for soil water-holding capacity than its effect on hydrophobicity. HTT affected biochar yield, cation exchange-capacity and provision of fungal substrates. HTT also significantly influenced the effect of biochar on soil suction. Smaller feedstock particles produced biochars that were slightly more hydrophobic than those produced from larger particles. The effects of biochar application on the properties of sandy loam were influenced by biochar particle size, because larger particles had less effect on bulk density and had slower water uptake. A low biochar application rate (5 g kg-1) had no effect on the aggregate stability of a silt loam and did not affect the hydrological and erosional response of the soil under simulated rainfall. Application rates of 25 and 50 g kg-1 reduced aggregate stability, which led to surface sealing and overland flow generation occurring more readily. However, there was no more erosion of these soils than those with low or zero biochar content, and the crusts formed by seal drying were much weaker than those formed on soils with low or zero biochar. Biochar was preferentially eroded from the soils, regardless of the application rate used. HTT and particle size can have important implications both for the properties of biochar itself and for its effects on soil properties. However, biochar may only substantially influence soil hydrology and erosion when applied at sufficiently high rates.
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Soil erosion and conservation in Zimbabwe : political economy and the environmentElliott, Jennifer A. January 1989 (has links)
This thesis concerns soil erosion and conservation in Zimbabwe. It is framed in the light of the contemporary heightened concern for the environment generally in Africa and the recent publication of the National Conservation Strategy for Zimbabwe (1987). Soil erosion is an archetypal interdisciplinary problem. This thesis complements and extends understanding of soil erosion and conservation in Zimbabwe via a methodological approach and a scale of analysis which have been under-represented in the literature to date. The research adopts a pluralist, regional political ecology approach (after Blaikie and Brookfield 1987) to soil erosion and conservation in Svosve communal area, combining political-economic understanding with case study analysis of changing social-environmental relationships. Plural problem definitions are constructed through interview and survey techniques, historical analysiso f archival sourcesa nd oral testimonies,a ssessmenot f contemporary policy and planning documents and via sequential air photograph analysis. The researchc hallengesa spectso f the colonial conservationislti terature to date for southernA frica andn ational level modelling of human-environmenrte lationshipsi n Zimbabwe. It presentsa quantitativea ssessmenotf the changei n symptomso f deterioration and in the nature and extent of soil erosion for the case study area. It operationalisesth e concepto f multiple problem definitions with implications for the contemporary model for conservation extension and for improving the role of local development institutions.
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An erosion hazard assessment technique for CiskeiWeaver, Alex van Breda January 1989 (has links)
The study examines the relationship between the spatial variation in soil erosion and various natural and anthropogenic attributes of the region between the coastal plateau and the Winterberg escarpment of Ciskei. A raster-based geographical information system is derived for four separate study catchments and data on soil erosion and various soil erosion hazard indices are read into a computerised data matrix. The independent variables (soil erosion hazard indices) used in the study are selected on the basis of a review of the literature and on the availability of data in the Ciskei region. Multivariate analyses of the relationship between soil erosion and the various independent variables reveals that the primary variables affecting the spatial variation in soil erosion are land use, dominant soil type, geology, veld type and mean annual precipitation. All of these variables are readily quantifiable at the regional scale for large areas of Ciskei. An erosion hazard assessment model for use in central Ciskei is developed based on the results of the statistical analyses. The model is tested in separate study areas and is shown to provide an efficient method of identifying areas of differing susceptibility to soil erosion. The derived model is simple to operate and has input requirements which are easily met. It can be applied without the aid of computers, or where large areas are to be mapped it is well suited to computerisation
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