Development of a Three-Dimensional Hydrodynamic Model of Lake Sammamish
A 3-dimensional hydrodynamic model of Lake Sammamish was developed to support analyses of the impacts of possible future land use and climate change scenarios on hydrology and water quality, and the resulting impacts on aquatic biota. An existing coupled 3-D hydrodynamic and water quality modeling framework originally developed for the Chesapeake Bay Program (CH3D-Z and CE-QUAL-ICM) was selected for application to Lake Sammamish and Lake Washington. Initial development and testing of the models on Lake Washington by the U.S. Army Corps of Engineers Waterways Experiment Station (ACOE-WES) resulted in a modeling system suitable for application to lakes (Cerco et al. 2003, Johnson et al. 2003). The CH3D-Z model code used in the ACOE-ERDC Lake Washington application was used with minor modifications to simulate Lake Sammamish hydrodynamics.
The development (including minor modifications), calibration, and testing of the Lake Sammamish model is described in this report. The current version of the model is capable of reliably reproducing the seasonal and spatial thermal dynamics of the lake based on comparison to routine temperature profile data collected between 1995 and 2002. Small systematic seasonal, interannual, and spatial (primarily vertical) thermal errors remain that will require further data collection, testing, and refinement to reduce. Nonetheless, the model represents one of several potentially useful tools to evaluate the effects of land use and climate change on the aquatic resources of King County.
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