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Title: Grand and White Lakes Flood Control Project : numerical model investigation
Authors: United States. Army. Corps of Engineers. New Orleans District.
Letter, Joseph V.
Keywords: Flood control
Flood prevention
Grand Lake, Louisiana
White Lake, Louisiana
Grand and White Lakes, Louisiana
Mermentau River, Louisiana
Multidimensional modeling
Multidimensional models
Salinity intrusions
Saltwater encroachment
Wetland conservation
Numerical models
Mathematical models
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; HL-93-11.
Description: Technical Report
Abstract: The Grand and White Lakes flood control project provides protection over a broad portion of the Louisiana coastline. The study area involves a wide variety of wetlands and complex canals and waterways. The area supports many economic interests with potentially conflicting desires for management of the water resources. The project required the capability of quantitatively estimating the relative performance of a large number of design alternatives. Numerical modeling techniques capable of addressing tbe flood routing and salinity intrusion processes required to evaluate project alternatives were developed. These techniques included the specification of control structures within the one-dimensional finite element formulation, utilization of marsh porosity, discretization of complex spatial geometric features of the wetlands, and the use of one-dimensional networking in conjunction with the two-dimensional finite element formulation. Numerical testing was performed for eighteen separate design alternatives for the system. Flood events with 2-, 5-, 10-, 25- and 50-year return intervals were simulated and stage exceedance curves generated. Salinity intrusion testing was performed for tbe influence of marine organism ingress structures on the upstream basin. The results of the testing showed that the marine ingress structures should be very modest in size if salinity intrusion problems are to be avoided. The flood control testing suggested that the optimum location of the increased flow capacity should be near the mouth of the primary tributary, tbe Mermentau River, or else extensive channelization would have to accompany an alternate location.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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