街道及下水道之雙排水系統快速淹水模擬

近年來因極端降雨事件增加，使得淹水事件頻傳，快速、即時的評估淹水潛勢地區變得相當重要，因此，本研究發展雙排水系統淹水模式來快速評估淹水狀況，此模式結合降雨逕流、一維下水道及一維街道等三種模組，並藉由改變模組的演算順序，可提出兩種雨水收集方法，分別為下水道收集（方法A）及街道收集（方法B），並比較兩者在下水道水位及街道淹水之差異。本研究以臺北市文山區木柵次集水區為研究區域，並以兩場短延時事件進行模擬與分析，結果顯示，較符合真實雨水收集機制之方法B，其下水道水位及街道淹水範圍之模擬結果皆較貼近實際調查狀況，則視其為本研究街道淹水模式的代表，並透過與二維淹水模式之比較，可發現街道淹水模式在計算時間上有較好的表現，未來結合觀測雨量與降雨預報可做為即時淹水災害評估之參考。

關鍵字

雙排水系統；街道淹水模式；雨水下水道；快速淹水模擬

並列摘要

In recent years, flooding in urban areas have been occurring more frequently due to the increasing of extreme rainfall events. Therefore, assessment of high inundation potential areas in metropolises becomes very important. This study attempts to develop a street flood inundation model for fast evaluation of street flooding. This model consists of three modules: (1) rainfall-runoff transformation, (2) 1D street flow routing, (3) 1D sewer flow routing. By changing the routing order of these three modules, two different rainfall collection methods including Method A: rainwater into storm sewers first and Method B: rainwater into street first, are proposed to evaluate potential flooding streets right after rainfall events occurred. In this study, Muzha drainage basin in Wenshan District, Taipei, is selected as the study area. Two short duration rainfall events are used for simulation and analysis. Due to the closeness to real rainfall collection phenomena, the simulated results from Method B has a better agreement with the measured data of street inundation areas and sewer water levels than Method A. Thus, we take method B as a representation of street flood inundation model. Compared to 2D flood inundation models, street flood inundation model has a better performance on computation time and may be used to evaluate the flooding disaster immediately.

並列關鍵字

Dual Drainage System ； Street flood inundation model ； Storm sewer flow ； Fast flood inundation modelling

國際替代計量

街道及下水道之雙排水系統快速淹水模擬

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