Modelling hydrodynamics and water quality in the separation waterway of the Yulin offshore industrial park, Taiwan

A vertical two-dimensional, real-time model of estuarine hydrodynamics and water quality was modified and used to determine the rational width of the separation waterway. The model modification is necessary to account for the multiple outlets into the sea when the whole system of the separation waterways is completed. Model calibration and verification were conducted with current, residual velocity, salinity, and water quality variables measured in the completed portion of the waterway. The overall performance of the model was in qualitative agreement with the available field data. The model was then used to evaluate several scenarios of different widths for the yet-to-be completed system of separation waterways. Based on the model simulation results, a 200 m wide waterway, bordered by 300 m wide flood plain, is recommended for adoption. The model simulation indicated that coastal water quality standard may be attained and inundation by the 50-year flood may be avoided by such a separation waterway.