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標題: 坡地社區淹水問題改善策略之探討 -以台南縣大內地區排水為例
Study on Improving Policy for Inundation Problem at the Hillside Community - Ta-Nei Regional Drainage in Tainan County as an Example
作者: 林志鴻
Lin, Chih-Hung
關鍵字: 洪氾區;floodplain;截彎取直;非工程方法;定量降雨預報;防洪社區;集水區;區域排水;SOBEK二維淹水模式;重現期距;nonstructural measure;quantity rainfall predict;disaster resilient communities;watershed;regional drainage;SOBEK 2-D flooding simulation model;recurrence interval
出版社: 水土保持學系所
本研究係利用SOBEK二維淹水模式進行坡地淹水範圍分析,由不同重現期距之降雨條件來模擬大內地區之淹水情形,並探討坡地排水所衍生之淹水原因與問題癥結所在。本研究發現最能根本解決之作法為:須將現有之北(石子瀨)、中(大內)、南(內江) 3條排水路先予拓寬以利排水,而為避免山洪流經市區之箱涵時,因斷面瓶頸而造成水患,則以截流方式將水截排至北邊之石子瀨排水,並於集水區出口處設置滯洪池,同時配合小型抽排方式以處理周邊低窪之內水,待外水退後再自然排除,必可有效改善本區之淹水問題。本研究之結果可提供相關單位在區域排水治理時決策之參考。

Ta-Nei Township is located at the downstream of 40 kilometer of Tseng-Wen Reservoir. Due to the low-lay terrain, narrow cross sections, lands development, and climate change, the area located at the western of Tainan Road No. 181 was zoned as floodplain of the Tseng-Wen River. The floods occurred frequently during the periods of high precipitation. Although the dikes were implemented by government to prevent from the outer water of Tseng-Wen River, the local inner water which can not be drained efficiently became another flooding problem.
The traditional flood control measure is channel harnessing, such as dredging, truncation of curviform channel, channelized, and levees rising. These measures only consider that drain the discharge to the downstream, but ignored the impacts to the ecology. Because of the development of ecological conservation in recently years, the nonstructural measures, such as quantity rainfall predict, floods alarm, emergency response, disaster resilient communities, land use control, rainwater harvesting, floodplain zoning and management, and land restoration and reclamation are mentioned gradually for flood mitigation. Avoiding unsuitable flood control implements and selecting appreciate ones to reduce the impacts the ecological environment has become an important task.
This study applied SOBEK, a 2-D flooding simulation model, to simulate the flooding area according to the rainfall intensities of different recurrence intervals. This study suggests several measures to mitigate the flood disaster efficiently and will be a reference for decide making. The measurements include increasing the cross sections of north (Shih-Tzu-Kai), middle (Ta-Nei), south (Nei-Jiang) drainages, the diversion of the upstream discharge from mountain area to the Shih-Tzu-Kai drainages, and the construction of retention basin in the downstream collocating with small-scale pumping to deal with inner water.
Appears in Collections:水土保持學系

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