Accession Number : ADA300216

Title :   Coastal Water Clarity Modeling Feasibility Study.

Descriptive Note : Final rept.,

Corporate Author : SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA

Personal Author(s) : Hammond, Robert R. ; Jenkins, Scott A. ; Cleveland, Joan S. ; Talcott, John C. ; Heath, Alan L.

PDF Url : ADA300216

Report Date : 28 FEB 1995

Pagination or Media Count : 321

Abstract : The goal of the ONR Coastal Water Clarity Program was to assess the feasibility of developing an integrated computer model for predicting diurnal and episodic changes in near-coastal water optical properties. The approach was to build a detailed coastal environmental computer simulation, based on local meteorological, hydrological, and oceanographic observables, to predict spatial and temporal variations of optically significant constituents in the coastal water column. Because comprehensive space/time data for the nearshore regime is not available, the level of feasibility was limited to demonstration of a working predictive visibility model (PVM), producing reasonable optical and interim environmental parameter variations over extended periods of time (multiple days). This PVM resides on a Sun SPARC workstation and provides spatial and temporal estimates of suspended sediment, biological populations, and hydrodynamic transport, and their impact on subsurface optical properties. Inorganic source estimates include river, surf, and bottom resuspension and biological estimates include time variable plankton growth, as well as dissolved organic materials of river and plankton origin. Off-line coastal topography, bathymetry, hydrology, and processed remote sensor input are required in GIS data layers to begin the simulation. The model concept would employ sets of calibration parameters selected to cover generic geological, biological, benthic, and optical environmental situations. From these categories, composite sites would be established to provide the spatial and temporal estimates required. This report evaluates sensitivity to required input parameters and the parametric resolutions required for this type of simulation. The assumptions employed, and critical experiments required, for model improvement are also discussed.

Descriptors :   *COASTAL REGIONS, *BATHYMETRY, *VISIBILITY, *WATER QUALITY, DATA BASES, COMPUTER PROGRAM DOCUMENTATION, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, SPATIAL DISTRIBUTION, TIME INTERVALS, LIGHT SCATTERING, OPTICAL PROPERTIES, INTEGRATED SYSTEMS, OCEAN WAVES, PARAMETERS, INSHORE AREAS, RESOLUTION, HYDROLOGY, OCEANOGRAPHIC DATA, TIDAL CURRENTS, MARINE GEOLOGY, SUSPENDED SEDIMENTS, FEASIBILITY STUDIES, MATHEMATICAL PREDICTION, ORGANIC MATERIALS, MARINE BIOLOGY, CALIBRATION, RIVERS, SUBROUTINES, OCEAN MODELS, OCEAN BOTTOM TOPOGRAPHY, HYDRODYNAMICS, SUBSURFACE, DIURNAL VARIATIONS, PHYTOPLANKTON, BENTHONIC ZONES, SURF, INORGANIC MATERIALS, NITRATES, OFFLINE SYSTEMS, GRAZING, PHOTOSYNTHESIS.

Subject Categories : Physical and Dynamic Oceanography
      Hydrology, Limnology and Potamology
      Biological Oceanography
      Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE