수로특성을 갖는 감조하천의 퇴적환경 수치모의

Abstract

The drainage channel located inside Asan Bay area has the characteristics of a man-made tidal stream created by the port construction. These artificially established waterways exhibit extreme characteristics, such as sedimentation or erosion, due to the large and simplified flow rates compared to ordinary streams. Therefore, in order to identify the current status of the sedimentary environment, the influences of tide, wave, and streams acting as external conditions of the sedimentary environment were analyzed in this study. The current state of flow and sedimentary environment was estimated numerically. As a result of the simulation, it has been confirmed that the ebb currents have weakened in the narrow waterway during normal period, while the ebb currents have been reinforced during the flooding period. The effects of the flow rate excluded from the stream during the flooding period are outstanding. It was also shown that erosion is dominant in the narrow waterways and curves, while in other waterways, deposition is dominant. Based on this, long-term modeling was performed for the next 1, 5 and 10 years, and as a result, it is seemed that the sedimentary environment of the drainage is kept in equilibrium. However, it is deemed necessary to analyze and make correction to the results, because the most of the drainage channels are high in the air exposure time, resulting in solidification of the ground, therefore, it does not follow the long-term simulation result.