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 54 for “"hillslopes"”.
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Particle labeling for sediment source tracking on hillslopes
Soil erosion on hillslopes is a dynamic process, which evolves temporally and spatially. Sediment source tracking can be used to identify the areas within a watershed where erosion is greatest. This study evaluated three sediment source tracking techniques, rare earth element (REE) particle …
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Investigation of hydrologic and sediment transport processes on riparian hillslopes
… sediment transport response of riparian zones/hillslopes. Research investigations were focused in two major areas: field investigations of riparian hillslopes and development of a riparian hillslope model. The objective of the field investigations was to characterize and quantify geomorphic …
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Modelling runoff generation and connectivity for semi-arid hillslopes and small catchments
The processes relating to runoff generation in a semi-arid environment at the hillslope scale are poorly understood. This research considers the amount and origin of water reaching the channel during a storm event using a combination of field experiments and computer simulation techniques. From the …
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Runoff from hummock-covered Arctic tundra hillslopes in the continuous permafrost zone
Runoff processes at three hummock-covered hillslopes within a 95 ha catchment (Siksik Creek) in the tundra region of the Canadian western Arctic were studied for three years (1992-1994). Measurements over the study included all hydrological inputs, monitoring of active layer and water table depths, …
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Effects of Cultivation Techniques on Maize Productivity and Soil Properties on Hillslopes in Yunnan Province, China
The rapid population increase in China from 556.7 to 1226.7 million during the past 50 years means China has one-sixth of the world’s population. This population growth has imposed high pressures on Chinese agriculture. Crop production and productivities have more than doubled, for example mean …
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Rates of hillslope lowering in the Badlands of North Dakota
… of 0.41 inch per year on the west-facing hillslopes underlain by the Sentinel Butte Formation, 0.14 inch per year on the southwest-facing hillslopes underlain by the Tongue River Formation, and 0.11 inch per year on the northeast-facing hillslopes underlain by the Tongue River Formation. …
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Hillslope evolution in response to lateral base level migration
Hillslopes evolve in response to base level change, sediment production, and sediment transport. Many previous studies have focused on hillslopes undergoing vertical base level migration due to tectonic forcing and bedrock incision. Many geomorphic features, however, are characterized by lateral …
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Assessment of Site and Soil Characteristics of Rill Erosion Following the Lockheed Fire in the Little Creek Watershed, Swanton Pacific Ranch
… of this material was derived from two chaparral hillslopes. These hillslopes were identified as the only two hillslopes within the Little Creek subwatershed where an extensive network of rill erosion had occurred. The purpose of this study was to determine what factors were related to the erosion …
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Water flow paths in soils of an undisturbed and landslide affected mature montane rainforest in South Ecuador
… in soils of landslide affected and unaffected hillslopes. Therefore, we employed conventional field- and laboratory methods, dye tracer experiments including an appropriate image processing technique, as well as statistical models. Results show that both rock fragment content and bulk density …
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Biogeomorphology and soil geomorphology of small semiarid basins, northeastern Arizona : influences of topoclimate and climate variations
… erosion and plant community establishment on hillslopes in this semiarid environment. In small basins formed at the base of Black Mesa escarpment west of Chinle, Arizona, Jurassic sandstones cemented mainly by clay minerals weather by hydration, favoring relatively high erodibility. Two end …
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Energy controls on diurnal snowmelt events and stream recharge, Lost Horse Canyon, Bitterroot Mountains, MT
… considered as a tool to assess the role of hillslopes in moderating stream recharge from snowmelt runoff over sub-daily timescales. In this study we compare high frequency (15-minute) atmospheric radiation and its influence on the timing and magnitude of both water table and stream stage …
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Energy controls on diurnal snowmelt events and stream recharge, Lost Horse Canyon, Bitterroot Mountains, MT
… considered as a tool to assess the role of hillslopes in moderating stream recharge from snowmelt runoff over sub-daily timescales. In this study we compare high frequency (15-minute) atmospheric radiation and its influence on the timing and magnitude of both water table and stream stage …
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Studying signatures of water on Mars at two macro and micro scales : orbital analyses of hillslope geomorphology and ChemCam calibration for surficial rock chemistry
… (LIBS). In the first set of studies on hillslopes, the expected differences in hillslope processes in extraterrestrial environments are explored. As on Earth, the major drivers of these processes are gravity and climate. Extraterrestrial hillslopes are unique environments that may be …
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Topographic and material controls on the Scottish debris flow geohazard
… debris flow measured in the field indicate that hillslopes underlain by sandstone and granitic bedrocks, which tend to be mantled by coarser sand rich soils, have a greater frequency of flows than those underlain by schist andextrusive lava bedrocks. Higher debris flow densities on slopes …
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Investigating the Effects of Lithology on Landscape Evolution Processes across Scales
… the geomorphic function of boulders found on hillslopes and channels in the Valley and Ridge province of the Appalachians, which are sourced from resistant lithologies capping ridgelines. High-resolution UAV surveys and field mapping of boulder distributions and characteristics reveal that …
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Weathering and soil properties on catenary sequences in forest and alpine ecosystems of the central Rocky Mountains
… and topographically connected along hillslopes from higher elevation to lower elevation. Using the catena model, I investigated the manifestation of soil forming factors in conditioning weathering and soil development in the Mountain Ecosystems of the Fraser Experimental Forest (FEF), …
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Controls on post-High Park Fire channel response, South Fork Cache la Poudre Basin, Colorado
… South Fork Cache la Poudre River indicate that hillslopes were the primary source of suspended sediment. Where the straw mulch was retained on hillslopes, it was effective at limiting erosion. The channel network was largely resistant to change during the second year of post-fire monitoring due …
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The transient response of bedrock river networks to sudden base level fall
… network, progressively adjusting channels and hillslopes to the new conditions. When conditions favor incision, the rate and mechanism by which this signal propagates throughout the network determines basin response time. This ultimately influences the growth and stability of mountain ranges …
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THE CHARACTERIZATION AND MODELLING/OF SOIL WATER PATHWAYS BENEATH A CONIFEROUS HILLSLOPE IN MID WALES
… to provide such a characterization for two hillslopes - one afforested with conifers, the other an improved grassland. Much of the uncertainty associated with the identification of soil-water-pathways stems from an inadequate characterization of the errors imposed by the use of each …
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