ABSTRACT
Sungai Johor estuary is a vital water body in the South of Johor and greatly affects the water quality in the Johor Straits. In the development of the hydrodynamic and water quality models for Sungai Johor estuary, the Environmental Fluid Dynamics Code (EFDC) model was selected. In this application, the EFDC hydrodynamic model was configured to simulate time varying surface elevation, velocity, salinity, and water temperature. The EFDC water quality model was configured to simulate dissolved oxygen (DO), dissolved organic carbon (DOC), chemical oxygen demand (COD), ammonia nitrogen (NH4N), nitrate nitrogen (NO3N), total phosphate (PO4), and Chlorophyll a. The hydrodynamic and water quality model calibration was performed utilizing a set of site specific data acquired on January 2008. The simulated water temperature, salinity and DO showed good and fairly good agreement with observations. The calculated correlation coefficients between computed and observed temperature and salinity were lower compared with water level. Sensitivity analysis was performed on hydrodynamic and water quality models input parameters to quantify their impact on model results such as water surface elevation, salinity and dissolved oxygen concentration. It is anticipated and recommended that the development of this model be continued to synthesize additional field data into the modeling process.
KEYWORDS: hydrodynamic model, water quality model, calibration, sensitivity analysis
INTENSIVE FIELD SURVEY PROGRAM
HYDRODYNAMIC AND WATER QUALITY MODEL DEVELOPMENT
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