Abstract
A comprehensive modeling study was undertaken to examine the hydrodynamics and transport and fate of biochemical oxygen demand (BOD) and dissolved oxygen (DO) in the Ai Estuary, Kaohsiung, Taiwan. Especially, a laterally averaged hydrodynamic and water quality model was developed and calibrated in an attempt to understand the effluent impact on the water quality of the estuary. A set of hydraulic parameters based on two different field surveys was derived from the model calibration. However, some of the water quality parameters derived from different field data sets are not consistent. The parameter sensitivity analysis further shows that the BOD removal and deoxygenation rates and the chlorophyll a level, which all vary widely with time and space in the estuary, have significant effects on the BOD and/or DO dynamics. This reveals the necessity of investigating the range of the BOD rate constants and the seasonal variation of the Chl a level for the estuary. The model was then applied to wastewater impact assessment by evaluating the time interval for the DO level restored to 5 mg/L along the estuary under different wastewater discharge conditions. The simulation result is consistent with the field surveys. This study further reveals that the restoration time can be reduced considerably if the dischargerate and duration are moderately controlled.
Published Version
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