Suspended sediment transport effectiveness of three large impounded rivers, U.S. Gulf Coastal Plain |
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Authors: | P F Hudson Joann Mossa |
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Institution: | (1) Department of Geography and Anthropology, Louisiana State University, Baton Rouge, LA, 70803-4105 USA, US;(2) Department of Geography, University of Florida, Gainesville, FL, USA, US |
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Abstract: | Suspended sediment transport effectiveness was examined near the mouths of three large impounded rivers (Rio Grande, Brazos,
and Pearl Rivers) in differing precipitation regimes in the U.S. Gulf Coastal Plain. Magnitude and frequency analysis of suspended
sediment transport was performed by examining the effectiveness of both discharge and time in transporting suspended sediment.
Bivariate plots of discharge with infrequent values of silt/clay and sand provide an insight into the relative proportion
of coarse-versus fine-grained sediment transport for the three rivers. Despite the aridity of the Rio Grande and Brazos drainage
basins, which is often associated with infrequent or episodic transport of sediment, the duration of the effective discharge
is similar to humid basins described in the literature. The majority of sediment transport occurs during the moderate discharge
events, having a duration of 2.4%, 1.5%, and 4.4% for the Rio Grande, Brazos, and Pearl Rivers, respectively. This may be
due to the influence of scale or the influence of upstream dams and reservoirs on discharge and sediment transport. Findings
from this research suggest that magnitude and frequency analysis of discharge and suspended sediment near the mouths of large
rivers may provide a useful framework for understanding the timing and delivery of riverine sediments to the nearshore coastal
environment from rivers draining a range of geologic and climatic settings.
Received: 6 September 1996 · Accepted: 4 February 1997 |
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Keywords: | Suspended sediment transport Impoundments Magnitude-frequency analysis Effective discharge |
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