Development of Long-Term Three-Dimensional Hydrodynamics in Long Island Sound for Use in Water Quality Modeling

by Richard A. Schmalz, Jr., (M.ASCE), Natl Oceanic and Atmospheric, Administration, Silver Spring, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


The Blumberg-Mellor (1987) three-dimensional hydrodynamic model has been adapted by the National Oceanic and Atmospheric Administration's National Ocean Service (NOS) to provide hydrodynamic fields for use in United States Environmental Protection Agency (EPA) water-quality modeling studies in support of water quality management of the Sound. The NOS model has been calibrated to astronomical tide over September 1989 and residual circulation and thermohaline structures during the eighteen month period, April 1988 - September 1989 (Schmalz, 1994). Since NOS acoustic Doppler current profiler (ADCP) measurements were not intended to provide detailed flow characterization in the East River, NOS recommended EPA development of a fine grid East and Harlem River System three-dimensional hydrodynamic model to directly provide nontidal transport targets for the coarser grid NOS model. The development of the appropriate NOS model datum offsets required to meet these targets is initially considered. Next, results of three eighteen month simulations using the appropriate offsets are presented. An objective simulation selection procedure is outlined for comparison and evaluation of the three simulation set. Finally, results are summarized and conclusions drawn with respect to the development of coordinated measurement and modeling techniques in support of water quality modeling.

Subject Headings: Water quality | Hydrologic models | Islands | Water use | Temperature measurement | Three-dimensional models | Quality control | Environmental Protection Agency | United States | Connecticut | New York

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