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Published by the American Geophysical Union as part of the Water Science and Application Series, Volume 6. During the past four decades, computer-based mathematical models of watershed hydrology have been widely used for a variety of applications including hydrologic forecasting, hydrologic design, and water resources management. These models are based on general mathematical descriptions of the watershed processes that transform natural forcing (e.g., rainfall over the landscape) into response (e.g., runoff in the rivers). The user of a watershed hydrology model must specify the model parameters before the model is able to properly simulate the watershed behavior.
The purpose of this study is to explore the physical transport and water quality in the Delaware Inland Bays through coupling two models: ECOMSED and RCA. ECOMSED is a fully integrated three-dimensional hydrodynamic model, and RCA is a general purpose water quality model. The Delaware Inland Bays, located in Sussex County, Delaware, consist of two interconnected shallow coastal lagoons, Indian River Bay and Rehoboth Bay. The Inland Bays are connected to the Atlantic Ocean via the Indian River Inlet and they are tidally flushed. The Inland Bays are typical shallow bar-built estuaries that play a significant ecological role due to their high primary and secondary productivity. The entire Inland Bays are the model domain, and a grid generation program, CoastGrid is used to generate the curvilinear grid. The grid has high resolution in the Bays, satisfying the resolution needed along the tortuous rivers. The coupled model systems have been set up, taking account of tidal elevation, freshwater discharges, wind stress, and water surface heat exchange. Also, reactions affecting dissolved oxygen are included in the water quality model, such as plant photosynthesis, respiration, and reaeration. A database of Delaware Inland Bays has been provided by DNREC to calibrate and verify the coupled models. The formatted database contains the available data in the Inland Bays. (Abstract shortened by UMI.).