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題名 | 結合HEC-RAS模式與GIS模擬洪災之研究--以筏子溪為例=Combining HEC-RAS Model with GIS on Flood Simulation for Far-Tzu Creek |
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作者 | 吳輝龍; 謝平城; 陳文福; 陳瑞宗; | 書刊名 | 水土保持學報 |
卷期 | 35:4 2003.12[民92.12] |
頁次 | 頁347-363 |
分類號 | 443.42 |
關鍵詞 | 洪峰流量; 一維變量流; 地理資訊系統; Peak discharge; One-dimensional unsteady flow; GIS; |
語文 | 中文(Chinese) |
中文摘要 | 由於桃芝颱風於民國九十年七月底攔腰侵襲臺灣,帶來罕見的豪雨,致使位於臺中市與烏日鄉交界處之平地河川筏子溪的溪水暴漲,造成下游兩岸淹水,並導致財產的損失。陳文福等(2003)以HEC-RAS定量流模式模擬桃芝颱風豪雨導致筏子溪水患之研究;在真實情況中,河川之流量會隨時間變化,故在本文中以「變量流」模式對筏子溪淹水現象加以探討分析,希望能以此方式模擬出更佳之效果;所需之邊界條件是以臺中、大肚、水湳三個水文站於桃芝颱風時的降雨資料與筏子溪單位歷線等資料,求出當時下游段之洪峰流量以及逕流歷線。再由筏子溪之斷面測量資料,對筏子溪下游段(集泉橋至筏子溪橋間)與烏溪匯流口附近,運用HEC-RAS水理模式,以一維變量流之觀念模擬出桃芝颱風來襲時之水位,其溢流體積係利用側溢流堰之觀念加以推估。再結合HEC-RAS模式與GIS,利用GIS龐大的資料庫與其快速的運算能力,將原先HES-RAS只能單純地實施一維展示水位之功能,轉換為二維,即可以知道洪水在洪氾平原內洪水的分佈情況與水位,並劃定出淹水範圍與淹水深度,本研究之結果可供防洪工程決策之參考。 |
英文摘要 | In July 2001, typhoon Toraji entered central Taiwan and traveled from east coast to west coast. This typhoon brought exceptionally high rainfalls and caused serious flooding in the downstream of Far-tzu creek near Taichung and lots of properties were lost. Chen (2003) used steady flow modulus of HES-RAS model to simulate the inundation of downstream Far-tzu Creek due to typhoon Toraji flood. In this study unsteady flow modulus is applied to obtain better reaults. The boundary conditions are the recorded rainfalls of Taichung, Dah-Du and Shui-Nan stations and the unit hydrograph of this creek. The downstream cross section data are then inputted to simulate the water surface profile of Far-tzu creek by one-dimensional unsteady flow. With the model, we can judge whether it will overflow or not during typhoon Toraji, and the overflow volume was further estimated by the concept of lateral weir. Finally, by combining HEC-RAS model with GIS and taking advantage of the good data base and calculation ability, the view can be transferred from one dimension to two-dimension display. Furthermore the inundation range and the water surface can be defined. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。