Abstract
This study evaluated the instream flow of the existing dams and major water-level stations in the Imjingang river basin by the operation of Hwanggang Dam in North Korea and proposed a solution for securing instream flows. First, stream flow, basin inflow, and dam releases were reasonably estimated by water balance analysis using daily averaged data in the Imjingang river basin. Second, streamflows at major water-level stations in the Imjingang river basin decreased significantly after the Hwaggang dam operation, which confirmed that the Hwanggang Dam in North Korea had a significant effect on the streamflows of the Imjingang river basin in South Korea. Third, the instream flow analysis for the Imjingang river basin confirmed that instream flows were not consistently satisfied in all water-level stations. Finally, the Hwanggang Dam operation was one of the main reasons for the lack of instream flow, since the total amount and period of shortage increased up to 14,156% and 16,800%, respectively after the Hwanggan dam operation. We then suggested how to utilize the existing dams and shared river basins to secure instream flow. In the future, various long-term and well-planned strategies would be needed.
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