Numerical Simulation of Improving Water Quality with a Restored Canal at Dongbin Harbor

Abstract

The water quality at the Dongbin Harbor at Pohang City, located at the Southeastern area of the Korean peninsula, is getting worse due to the sewage and the wastewater from communities. Furthermore, the Dongbin Harbor appears stagnant water flow because the Harbor is almost isolated from the coastal area and is supplied by tidal currents through only the Yeongil Bay. This study represents a numerical simulation of inflowing water passing through an inland canal to be planned connecting Dongbin Harbor and the Hyeongsan River. For the study, an improvement of water quality is simulated at the Dongbin Harbor. To simulate the movement of waters, the current system is first simulated by using RMA2, a commercial program that considers tidal current and river flowing. A purified simulation for the fresh water from the Hyeongsan River is then simulated by using RMA4. For the comparative result of the numerical model, both the present condition and the future condition (after construction of an inland canal) is simulated. The results of these conditions reasonably simulate a real situation at the Dongbin Harbor. After construction of an inland canal, the water quality at the Dongbin Harbor will be compared to the fresh water quality of the Hyeongsan River at the steady state. The result of simulation will be used to decide the most effective design of the canal.