台中地區同安厝坑淹水潛勢之研究

近年來，由於地球環境的破壞，氣候變遷越演越烈。台灣地處太平洋西側，四面環海，每年六月到11月為颱風的好發期，而往往颱風挾帶著豐沛的雨量，在台灣排水條件不良與地勢平坦低窪地區往往造成淹水，使得人民身家財產飽受危害。因此本論文以台中區域的同安厝坑排水為研究區域，採國內常見的一維淹水模式HEC-RAS與二維淹水模式FLO-2D與SOBEK進行淹水模擬與驗證。將各模式做驗證與比較後，採一合適模式在研究區域中，做淹水潛勢分析及規劃並提出建議與結論。期望在將來若有此研究區域的規劃需求，可以做一參考。研究發現下游出水口通水斷面不足，且地勢低漥，遭逢大雨常排水宣洩不及。以及斷面tonan13(1K+244)~ tonan33 (3K+172)斷面過小，不足以負荷排洪。因此擬配合高鐵台中站特定區之規劃，將下游蜿蜒渠道改道且設計為箱涵。另外再以填土方式改善下游低窪之地區。斷面tonan13(K+000)~tonan33(K+000)則配合保護標準予以改善。以期改善同安厝坑流域內淹水情況。

關鍵字

淹水潛勢；一維淹水模式；二維淹水模式

並列摘要

In these years, due to the damages of globe environment, climate change is becoming violently. Taiwan locates on the west side of the Pacific Ocean, surrounding by seas; therefore, it always carries abundant rains, during the time typhoon period (June to November), and cause flood in the defective-drainage and low-lying areas. People’s properties are being threatened. Accordingly, this thesis is focused on the drainage of tong-an-cuo in Taichung area, plus doing flooding experiments and imitations with HEC-RAS, FLD-2D and SOBEK. After comparing with the results, the most proper model will be employed to analyze the inundation potentials and propose a suggestion and conclusion. Expecting these results might be considered as a reference material of the future researches. The research discovers that drainage sections are lack in the lower reaches area. Also, terrains are too low, which lead to delay of draining. At the same time tonan13(1k+244)~ tonan33 (3k+172) are too small to carry on the draining works. Thus, to coordinate with the design of High- Speed-Road Taichung station, the canals in the lower reaches will be adjusted and change to culverts. Besides, low-lying lands will be filled, and tonan13(1k+244)~tonan33(3k+172) will be reconstructed base on the protect rules, in order to improve the situation of flooding.