11 |
THE SODDEN SWAMPS THAT SURROUND THEM: THREE ESSAYS CONCERNING THE LINKS BETWEEN RIVER CHANNELS AND THEIR OVERBANK ENVIRONMENTSJanuary 2017 (has links)
acase@tulane.edu / Though rivers are inextricably linked in our minds with an intermittently flooded overbank environment, surprisingly little is known about the sedimentary processes that operate there, or how they interact with those of the river. The knowledge gap is acute in deltas, where dense populations often necessitate tightly engineered control over flow patterns, leading to disconnected overbank environments that no longer receive input from the main channel. However, the need to understand sedimentary function in the overbank is also acute in deltas, as rising relative sea levels create an urgent need to manage water and sediment resources.
This dissertation is presented as three primary chapters, each of which examines a different aspect of the hydrodynamic and sedimentary connection between a river’s channel and its overbank environment. In Chapter 2, my coauthors and I ask which factors enhance overbank sediment retention, and what retention rates might be considered typical in deltas. We compare the sediments stored in a crevasse splay to those transported by the river and conclude that retention rates approaching 100% might be achievable in settings that are not exposed to coastal processes. Chapter 4 is also concerned with spatial patterns of sedimentation on a delta. In it we use physical experiments to examine the influence that floods play in mobilizing sediments from the channel and storing them in the overbank environment. We find, counterintuitively, that an experiment whose input included floods has a lower proportion of floodplain to channel deposits preserved than an experiment with a constant input. Chapter 3 is focused on water and sediment dynamics in the channel in a region where significant flow is lost to the overbank environment. Here we present measurements from channel networks in the Mississippi River’s Birdsfoot Delta and show that flow loss along the channels is a critical control on channel function that causes channels of disparate sizes to behave similarly. We use our field results to inform a numerical model of channel bed evolution in a region with flow losses, and conclude that the modern flood control system in the Lower Mississippi River may have significantly changed the bed morphology. / 1 / Christopher R. Esposito
|
12 |
Transverse transport of suspended sediment across the main channel - floodplain shear boundary /Denys, Frank January 2007 (has links)
Thesis (MScIng)--University of Stellenbosch, 2007. / Bibliography. Also available via the Internet.
|
13 |
Fluvial sediment influences on floodplain soil biogeochemistry /Bechtold, James Scott. January 2007 (has links)
Thesis (Ph. D.)--University of Washington, 2007. / Vita. Includes bibliographical references (leaves 141-160).
|
14 |
Residential satisfaction with home location : examination of the relationship between location-embedded benefits and risk perception /He, Xueqin. January 1900 (has links)
Thesis (Ph. D.)--Texas State University--San Marcos, 2009. / Vita. Appendices: leaves 132-141. Includes bibliographical references (leaves 142-152). Also available on microfilm.
|
15 |
Sedimentology of historic and prehistoric deposits in the drainage basin of Deep River and Muddy Creek on the Piedmont of North CarolinaSpurgeon, V. Leanne. January 2000 (has links)
Thesis (M.S.)--West Virginia University, 2000. / Title from document title page. Document formatted into pages; contains viii, 152 p. : ill. (some col.), maps. Includes abstract. Includes bibliographical references (p. 62-64).
|
16 |
Floodplain and flood probability mapping using geodatabases /Gallup, Douglas J., January 2005 (has links) (PDF)
Thesis (M.S.)--Brigham Young University. Dept. of Civil and Environmental Engineering, 2005. / Includes bibliographical references (p. 57-58).
|
17 |
The formation of benches in agricultural channels in OhioJayakaran, Anand D., January 2006 (has links)
Thesis (Ph. D.)--Ohio State University, 2006. / Title from first page of PDF file. Includes bibliographical references (p. 228-237).
|
18 |
The comparative sediment processes in channel and overbankJung, Kwansue, 1959- January 1989 (has links)
The question posed in this study is why alluvial soil on a floodplain is finer than the bed material of the river that supplied the sediments deposited to form the floodplain. A schematic, simplified river/floodplain system is used in an approximate analysis to find the size distribution of the floodplain soil. It is assumed that the stable limiting condition is a suspended load in the floodplain flow of the same concentration and composition as the sediment load in that portion of the river channel flow above the level of the floodplain. It was found that floodplain soil should be finer than the channel bed material; how much finer depending on the bank height, and to a lesser degree the width of the floodplain.
|
19 |
A sensitivity analysis of the influence of watershed and development characteristics on the cumulative impacts of stormwater detention pondsGoff, Karen Marie, January 2003 (has links) (PDF)
Thesis (M.S.)--University of Tennessee, Knoxville, 2003. / Title from title page screen (viewed Sept., 24, 2003). Thesis advisor: Randall W. Gentry. Document formatted into pages (viii, 164 p. : ill. (some col., col. maps)). Vita. Includes bibliographical references (p. 117-122).
|
20 |
Methodology for analyzing the cost-effectiveness of local floodplain management programs in Indiana as they relate to the national flood insurance program / Methodology for analyzing the cost-effectiveness of local floodplain management programs in Indiana.Trakimas, William L. January 1984 (has links)
The purpose of this thesis was to develop a methodology that could be used by local communities to evaluate the cost-effectiveness of their floodplain management programs. The methodology (i.e.: model) was designed to be usable by communities without requiring computer capability. The model looks at cost-effectiveness in terms of minimizing the average annual flood damages and the costs of programs implemented by the community to reduce flood damages. The Cities of Decatur, Elkhart, and Kokomo were selected to field test the model to illustrate current conditions in these communities. The City of Decatur was used as an example to show how alternative program scenarios could be developed, incorporated into the model, and used to determine the most cost-effective combination of average annual damages and program costs. The model was run to illustrate its method of operation and not to determine the cost-effectiveness of the floodplain management programs in the Cities of Decatur, Elkhart, and Kokomo. / Department of Urban Planning
|
Page generated in 0.0135 seconds