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.
Results
Showing 1 to 20 of 21 for “"channel incision"”.
-
The role of precipitation on Bedrock Channel Incision in Kauai, HI
Erosion of bedrock channels is frequently modeled with the stream power law, which relates erosion rates to drainage area, slope, and an erosional efficiency coefficient k. The value of k, however, varies with many physical factors and most of these relationships are not well quantified. This study …
-
Effect Of Stream Channel Incision On The Depth To Groundwater In Riparian Corridors Across Southwestern Minnesota
… corridor. Streams with a higher degree of incision may be less likely to have elevated groundwater tables, making them less effective at removing nitrogen from groundwater. By determining if there is a relationship between site characteristics and groundwater depth in the riparian corridor, …
-
Feedback between erosional morphology, sediment transport and abrasion in the transient adjustment of fluvial bedrock channels
This thesis explores the dependence of bedrock channel incision on coarse sediment supply through laboratory flume experiments and quantitative field observations of evolving channel morphology. Predictions of the saltation-abrasion model (Sklar and Dietrich, 2004) for sediment flux-dependent …
-
Holocene Arroyo Cut and Fills Cycles, South-Central Washington
… south-central Washington. The most recent channel incision episode along Selah Creek is primarily attributed to multiple failures of an irrigation reservoir dam during the winters of 1909 and 1910. The modern arroyo exposed evidence of at least one previous episode of arroyo incision to a …
-
Numerical modeling of groundwater-driven stream network evolution in low-relief areas
Fluvial channel networks are observed to grow in unchannelized areas of low relief despite the low potential energy for erosion in these areas of low slope. Under these low slope conditions significant channel growth only occurs when water is collected and flows as concentrated discharge in …
-
Distinguishing flood frequency and magnitude in the morphodynamics and sedimentology of rivers: insights from the South Saskatchewan River, Canada
… caused due to the flood through net erosion and channel incision across Bar A, subsequent low-magnitude high-frequency floods were able to rework morphology due to the ability to transport the medium sized sand bed load. In the subsurface, no distinct flood signature has been left, as flood …
-
Holocene Periods of Aggradation and Incision, Hanson Creek, Washington
… causes and timing of cycles of aggradation and incision in the Hanson Creek drainage in central Washington provide insight into changes in channel morphology and paleoenvironment within the region over the last 8000 years. Stratigraphically and spatially coincident archaeological evidence …
-
Bedrock channel response to tetonic, climatic and eustatic forcings
The response of bedrock channels to external forcings is investigated in this thesis. The approach is to test and constrain a theoretical model for bedrock-channel incision based on shear stress using field data. The primary study area is a series of 21 small, coastal drainage basins in northern …
-
Morphodynamics of large anabranching rivers : the case of the Madeira River, Brazil
Anabranching channels are the dominant channel pattern of large rivers worldwide. The top nine largest rivers of the world by water discharge, in particular, all develop anabranching channels. Given the limited understanding on large river morphodynamics and the mechanisms of formation and process …
-
Modelling the impact of surface melt on the hydrology and dynamics of the Greenland Ice Sheet
… with lake drainage over the ice surface via channel incision; an ice sheet model implementing a numerically efficient formulation of ice flow; an adjoint code of the ice flow model based on automatic differentiation. Together with a subglacial hydrology model, these represent the key …
-
Determination of Heterogeneity by High-Resolution Seismic Reservoir Characterization in the Heavy Oil Temblor Reservoir of Coalinga Field, California
… and isochron maps brought out two prominent channel-systems, recut and restacked in the central part of the area. These deposits were identified on seismic data and correlated to high-gamma coarsening-upward sands on logs and cores. The deeper one, shifting towards SSE with depth, lies …
-
Characterization of Pre and Post Re-Naturalized Surface Water/Groundwater Exchange, Jocko River, Flathead Indian Reservation, Montana
… protection levees in the 1950’s resulted in channel incision of 2200 ft of the Jocko River. Resulting floodplain water table lowering is thought to have altered surface water/groundwater interactions, impairing riparian habitat and trout fisheries. The objective of this research was to …
-
Bayesian Methods to Characterize Uncertainty in Predictive Modeling of the Effect of Urbanization on Aquatic Ecosystems
… where biota live are degraded by sedimentation, channel incision, floodplain disconnection, substrate alteration and elimination of reach diversity. These compounding changes ultimately lead to alteration of invertebrate community structure and function. Because the effects of urbanization on …
-
Characterization of Pre and Post Re-Naturalized Surface Water/Groundwater Exchange, Jocko River, Flathead Indian Reservation, Montana
… protection levees in the 1950’s resulted in channel incision of 2200 ft of the Jocko River. Resulting floodplain water table lowering is thought to have altered surface water/groundwater interactions, impairing riparian habitat and trout fisheries. The objective of this research was to …
-
Baseline data for assessing beaver dam analogs as a restoration tool in fire-affected tributaries of the Methow and Okanogan watersheds
… may be used to mitigate damage from stream incision and facilitate beaver establishment. However, it is unclear how effective BDAs are at mimicking natural beaver dams, especially on streams affected by high-intensity wildfires. The objective of my research is to collect baseline data needed …
-
Beaver moderated fire resistance in the North Cascades and potential for climate change adaptation
… hydrology, increasing the potential for harmful channel incision, which impairs riparian ecosystem function by lowering the water table, disconnecting floodplains from aquatic environments. However, wetlands and functioning riparian zones can reduce burn intensity. Beaver, with their unique …
-
An investigation into pixel- and object-based classification approaches for the detection of dolines on the surface of Antarctic ice shelves
… can be facilitated by overflow and lateral channel incision or through the opening of fissures by hydrofracture. Vertical, meltwater-induced fracture propagation through the ice shelf column as well as ring fractures produced around dolines during hydrostatic rebound have been associated …
-
Controls on post-High Park Fire channel response, South Fork Cache la Poudre Basin, Colorado
… The goal of this study was to evaluate how the channel network contributes to the production, transport, and storage of sediment by monitoring post-fire channel response. A better understanding of channel production, transport, and storage of sediment post-fire is required in order to predict …
-
BRIDGING AQUATIC AND TERRESTRIAL ECOSYSTEMS: ECOLOGY OF SEMI-AQUATIC MAMMALS IN SOUTHERN ILLINOIS
… predicted by % forest in the 1-km riparian area, channel incision, and amount mercury in the sediment. Colonization by muskrats was lower during the long spring to winter intervals than the short winter to spring intervals, and was positively related to the amount of organic carbon in the …
-
Changes in water chemistry and fluvial geomorphology from arsenic contaminated floodplains of Whitewood Creek and Belle Fourche River, South Dakota
… as overbank deposits and abandoned meander and channel fill. The introduction of mine tailings into these streams has impacted them chemically and geomorphologically for over 100 years. This study is a continuation of the work from Ji (2021) who focused on the long-term behavior of arsenic in …
Page 1 of 2