Three-dimensional simulation of wave-tide sediment transport in Danshui River

• Main Authors: Dai-Hua Lu, 呂岱華
• Other Authors: 周逸儒
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/chtcrs

碩士 === 國立臺灣大學 === 應用力學研究所 === 105 === In this study, a three-dimensional unstructured-grid numerical SUNTANS was used to simulate the sediment transport at the Danshui river mouth and surrounding coastlines. To validate the model, the free surface, salinity, wave height, and suspended sediment concentration (SSC) were tested against the field data. The effects of tides and waves on sediment transport at the river mouth and surrounding coastlines were discussed using the validated model. Results showed that under the same condition of tides and inflow, SSC increases in the presence of waves. The main reason of this phenomenon were winds and radiation stresses. After considering three different wind directions, we found that north wind result in the highest SSC occurring at north jetty of the Taipei port, where the wave direction is perpendicular to the coastline, and the radiation stresses are responsible of high SSC at the river mouth and surrounding coastlines.