Hydrodynamics and sediment transport in natural and beneficial use marshes

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Title: Hydrodynamics and sediment transport in natural and beneficial use marshes
Author: Kushwaha, Vaishali
Abstract: Since 1970 , U .S . Army Corps of Engineers , Galveston District , has been using dredged sediments from the Houston ship channel to create and restore salt marshes in Galveston Bay . Some projects have failed due to excessive sediment erosion or siltation . The research reported here applies an engineering approach to analysis of tidal creeks in natural and beneficial use marshes of Galveston Bay . The hydrodynamic numerical model , DYNLET , was used to assess circulation in marsh channels . A preliminary sediment transport model was developed to analyze erosion and deposition for the same channels . In situ flume experiments were conducted to determine the sediment erodibility in natural and constructed marshes . A natural reference marsh , Elm Grove , was studied to understand marsh hydrodynamics and model calibration . The model results show that DYNLET can largely duplicate the marsh hydrodynamics and the sediment transport model can provide preliminary indication of erosion in tidal creeks . Analysis of the preliminary channel layout of the beneficial -use marsh demonstrated that channels will have sufficient circulation and optimum velocities .
URI: http : / /hdl .handle .net /1969 .1 /4185
Date: 2006-10-30

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Hydrodynamics and sediment transport in natural and beneficial use marshes. Available electronically from http : / /hdl .handle .net /1969 .1 /4185 .

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