Author(s): Chris J. Berger; Robert L. Annear Jr.; Michael L. Mckillip; Vanessa Wells; Scott A. Wells
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Keywords: No Keywords
Abstract: Three hydrodynamic and water quality models of the Spokane River and Lake Roosevelt system were developed and linked together by Portland State University to develop Total Maximum Daily Loads (TMDL) for phosphorus. Model development was funded by the Washington Department of Ecology, the United States Environmental Protection Agency (EPA), and the Spokane Tribe. The Spokane River-Lake Roosevelt system consists of multiple river and reservoir sections and is located in the Northeastern part of Washington State and Idaho. The modeled section stretches from the Lake Coeur d'Alene, Idaho to Lake Roosevelt-an impoundment behind Grand Coulee dam on the Columbia River. The goals of the modeling effort were to gather data to construct a computer simulation model of the Spokane River system including Lake Roosevelt, Long Lake Reservoir and the pools behind Nine Mile dam, Upper Falls dam, Upriver dam and Post Falls dam; and to ensure that the combined model accurately represents the system hydrodynamics and water quality. The hydrodynamic and water quality model CE-QUAL-W2 used to model the Spokane River-Lake Roosevelt system. CE-QUAL-W2 is a two dimensional (longitudinal-vertical), laterally averaged, hydrodynamic and water quality model that has been under development by the Corps of Engineers Waterways Experiments Station. Included in the model are all major dischargers and tributaries. The ability to simulate multiple CBOD compartments in CE-QUAL-W2 permitted the simulation of discharger specific CBOD compartments and decay rates. In general, the model reproduces the river and reservoir responses to the known boundary conditions. The model is well suited for evaluating the impacts of management strategies to improve water quality in the Spokane River and Lake Roosevelt.
Year: 2009