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 65 for “"channel geometry"”.
-
Elevation based classification of streams and establishment of regime equations for predicting bankfull channel geometry
… to develop bankfull relations for estimating channel geometry that can be employed for stream restoration practices. Focusing on these two objectives, in this study a new stream classification system based on elevation above mean sea level has been developed and later using elevation as one of …
-
How do sand-bed meandering rivers co-construct their own bankfull discharge and bankfull channel geometry? Analytical and numerical study
Alluvial rivers are authors of their own geometry. Given water and sediment, a river constructs its own well-defined channel and floodplain. This channel is characterized by a bankfull width and depth, longitudinal slope, and bankfull discharge when the flow spills out onto the floodplain. No …
-
Effects of Forestry Streamside Management Zones on Stream Water Quality, Channel Geometry, Soil Erosion, and Timber Management in the Virginia Piedmont
… had no significant effect on water quality, channel geometry, or soil erosion in and around the streams. There was no apparent water quality degradation as a result of harvesting timber, and larger SMZs did not have an impact on any of the parameters studied. It was also apparent that leaving …
-
Field delineation of geomorphic process domains along river networks in the Colorado Front Range
… of process and form in headwater stream channels is required to remotely and accurately predict channel geometry characteristics for management purposes. Local variability of valley types and sediment production, or local process domains defined as glacial versus non-glacial valleys and …
-
Evaluating the impacts of urbanization and stormwater management practices on stream response
… frequency, and duration of flow in stream channels. These flow regime changes often alter the quality of aquatic habitats and native biota of streams. Identification of linkages between urban land use policies and practices and the associated geomorphic and ecological consequences in urban …
-
SAMPLING AND MODELING OF SEDIMENT TRANSPORT AND RESERVOIR EROSION FOLLOWING DAM REMOVAL: MILLTOWN DAM, MONTANA
… while both models predicted accurately confined channel geometry transport settings. Results from sampling and modeling demonstrate that the most important factors in reservoir sediment transport are the channel geometry, hydrology, and grain size and location of the reservoir sediment; which in …
-
SAMPLING AND MODELING OF SEDIMENT TRANSPORT AND RESERVOIR EROSION FOLLOWING DAM REMOVAL: MILLTOWN DAM, MONTANA
… while both models predicted accurately confined channel geometry transport settings. Results from sampling and modeling demonstrate that the most important factors in reservoir sediment transport are the channel geometry, hydrology, and grain size and location of the reservoir sediment; which in …
-
Low flow mixing in open channels
… of the effects of variations of flow and channel geometry on mixing and transport of polluted releases is necessary to establish sound water pollution control programs as well as water resources management programs.
-
The Effect of Structure and Lithology on Aspect Ratio of Fluvial Channels: A Field-Based Quantitative Study of the New River in Three Geologic Provinces
Fluvial channel geometry is controlled by the interaction of a number of geologic and hydraulic variables. The width of mixed alluvial-bedrock channels generally is a function of discharge, with variations due to local conditions. The aspect ratio (width/depth) of channels is heavily influenced by …
-
Utilizing archival data to assess historic changes in flood flow conveyance of the Mississippi River
… to quantify the effects of levee expansion, channel modification, and land-cover change upon flood stages, a 1-D unsteady flow model was developed for multiple historical reference conditions ("retro-models") for three large study reaches (225-315 km each): one along the MMR and two reaches …
-
Quantifying Channel Responses to the Removal of the Glines Canyon Dam in the Middle Reach of the Elwha River, Washington
… from 2012-2014. The complexity of the river geometry was a major factor in the ability of the river to trap and accumulate the new influx of woody debris and sediment from the dam removal, which influenced the response of the river channel. The change that occurred was quantified by using …
-
Rapid flood damage prediction in short lead-time scenarios
… models require a characterization of the stream channel, either through site surveys or through approximations. Further, the damage estimation methodology requires building inventories, which are developable by similar mechanisms. This dissertation advances knowledge on how to possibly address …
-
Modeling Low Flow Hydraulics in Alluvial Channels (pools-Riffles, Open)
… discharges due to the geometric and hydraulic channel features peculiar to these flow conditions. The dominant channel feature at low stages is the pool-riffle sequence, where pools are distinguished by deep, slow moving water and riffles by shallow, relatively rapid moving flow. Conventional …
-
Flood Capacity Improvement of San Jose Creek Channel Using HEC-RAS
… at re-designing this diverted portion of the channel. It presents an analysis of modifications to this reach in order to improve its capacity and reduce flooding during a 100-year event. As one of the most prominent software for hydraulic modeling for steady and unsteady state open channel …
-
Frequency analysis and two-dimensional simulations of extreme floods on a large watershed
… 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 geometry was defined using power functions for bank heights and channel widths based on field data collected at 20 sites. An …
-
Fabrication of microfluidic devices for artificial respiration
… pulmonary capillary network. The interconnected channel geometry was designed in such a way to minimize shear stress and reduce hemolysis and thrombosis inside the microchannel. It allowed alternative flow pathways in the event of single channel occlusion while minimizing the establishment of …
-
Mathematical and mechanical modeling of vaso-occlusion in sickle cell disease
… ambient oxygen concentration, and the vascular channel geometry. A range of blood samples was evaluated by selecting specimens with various hematocrits and concentrations of sickle hemoglobin. Velocity profiles were calculated following sudden changes in oxygen concentration. From these …
-
Crosstalk mitigation of high-speed interconnects using modal signaling
… arise over realistic tightly coupled cascaded channels with discontinuities in the signal path. First, we propose the application of generalized modal decomposition theory to the class of tightly coupled, nonhomogeneous and nonuniform channels with discontinuities. The proposed approach offers …
-
The Hydraulic Spline: Comparisons of Existing Surface Modeling Techniques and Development of a Spline-Based Approach for Hydrographic and Topographic Surface Modeling
… developed to generate irregular two-dimensional channel grids from hydrographic cross-sections at any desired resolution. Hydraulic spline output grids can be easily merged with datasets of higher resolution, such as LIDAR data, to build a complete model of channel geometry and overbank …
Page 1 of 4