應用HEC-RAS推估桶後溪烏來流量站之遷移範圍

APPLICATION OF HEC-RAS TO ESTIMATE THE MIGRATION RANGE OF WULAI FLOW GAUGE STATION ON THE TONGHOU RIVER

10.6652/JoCICHE.202310_35(6).0008

陳彥璋(Yen-Chang Chen)；楊翰宗(Han-Chung Yang)；陳彥慈(Yen-Tzu Chen)

迴水 ； 頻率分析 ； 二維水理分析 ； 水利防災 ； backwater ； frequency analysis ； two-dimensional hydraulic analysis ； water hazard mitigation

中國土木水利工程學刊

35卷6期（2023 / 10 / 01）

605 - 614

繁體中文;英文

烏來區位於新北市南端，為新北市面積最大之行政區。民國104年蘇迪勒颱風在烏來降下了1小時95毫米的強降雨，重創烏來地區。蘇迪勒颱風過後，烏來橋新增了流量站，用來推估桶後溪的流量，但是烏來橋容易因為桶後溪與南勢溪匯流產生的迴水，造成流量－水位率定曲線的不穩定。因而，本研究目的旨在透過南勢溪流量資料運用頻率分析推估不同重現期之洪峰流量，進而推估桶後溪之洪峰流量，再使用HEC-RAS二維水理分析，探討桶後溪在重現期200年下之最遠迴水範圍。研究分析結果顯示，桶後溪流量在重現期200年下，其迴水範圍大約在烏來橋往上游300公尺處（烏來國中旁）。其分析結果亦可知，主支流的流量差異大小，影響支流迴水範圍甚深。主支流流量差異越大，支流受到的迴水範圍越大，反之，主支流流量差異越小，支流受到的迴水範圍越小。本研究除了能在洪患災害上進行防範，也能對水利建設提供可信的應用數據。

Wulai District is located at the southern tip of New Taipei City and is the largest administrative district in New Taipei City. In 2015, Typhoon Soudelor dropped 95 mm of heavy rainfall in Wulai for 1 hour, severely damaging the Wulai area. After Typhoon Soudelor, a new discharge station was added to Wulai Bridge to estimate the discharge of Tonghou Creek. However, Wulai Bridge is prone to unstable discharge-stage curves due to the backwater generated by Tonghou Creek's and Nanshi Creek's confluence. Therefore, the purpose of this study is to use frequency analysis to estimate the flood peak discharge in different return periods through the discharge data of the Nanshi Creek, and then estimate the peak discharge of the Tonghou Creek, and then use HEC-RAS two- dimensional hydraulic analysis to explore the farthest backwater range of Tonghou Creek under the return period of 200 years. The results of the research and analysis show that, under the return period of 200 years, the backwater range of Tonghou Creek is about 300 meters upstream from Wulai Bridge (next to Wulai Junior High School). From the analysis results, it can also be seen that the difference in the discharge of the main and tributary streams has a deep impact on the backwater range of the tributary. The more significant the discharge difference between the main and tributary streams, the more extensive the backwater range received by the tributaries; on the contrary, the smaller the discharge difference between the main and tributary streams, the smaller the backwater range received by the tributaries. In addition to preventing flood disasters, this research can provide credible application data for water conservancy construction.

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