Dissertation/Thesis Abstract

Three Dimensional Hydrodynamic and Sediment Transport modeling of Wax Lake Delta in Atchafalaya Bay, Louisiana
by Khadka, Ashok Kumar, M.S., University of Louisiana at Lafayette, 2013, 82; 1553876
Abstract (Summary)

The Wax Lake Delta (WLD) is located at the downstream end of the Wax Lake outlet, approximately 13 miles upstream from Morgan City, Louisiana. In 1942 the United States Army Corps of Engineer (USACE) dredged Wax Lake Outlet channel from the lower Atchafalaya River to reduce flood stages at Morgan City. The channel diverts 50% of Atchafalaya River water and sediment to WLD. Since 1942, the WLD has been building seaward due to the deposition of sediment at the channel mouth. Growth of this delta supports the concept of land building via river diversions. Wax Lake Delta has often been studied and used as an analog for land building prediction for many proposed river diversions.

A process based morphodynamic model (Delft3D) is developed here to investigate the rate of land building at the WLD. The model is calibrated and validated for Hydrodynamics and Sediment transport through two sets of field observations for average flood and non-flood conditions. Vertical velocity and suspended sediment profiles made in the channels of the WLD in 2000 and 2001 are used for the model calibration and validation.

The model provides preliminary quantitative information on the land growth rate and sediment retention within the delta for the period 1998–2005. The model will be further calibrated using the comprehensive field data that are being gathered as a part of ongoing study funded by National Science Foundation (FESD-Delta Dynamics Collaboratory). The calibrated model will be employed to investigate the rate of land building and delta growth from the early 1970s to present.

Indexing (document details)
Advisor: Meselhe, Ehab
Commitee: Duke-Sylvester, Scott M., Habib, Emad, Khattak, Mohammad Jamal
School: University of Louisiana at Lafayette
Department: Civil Engineering
School Location: United States -- Louisiana
Source: MAI 52/06M(E), Masters Abstracts International
Subjects: Geological
Keywords: Delft3D, Hydrodynamics, Land building, Louisiana, Morphodynamic, Sediment transport, Wax Lake Delta
Publication Number: 1553876
ISBN: 978-1-303-82143-1
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