頭坑溪之土石流扇狀地歷史災害探討及風險性評估

Chaoyang University of Technology Institutional Repository > 理工學院 > 營建工程系 > 博碩士論文 > Item 310901800/28528

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Title:	頭坑溪之土石流扇狀地歷史災害探討及風險性評估 Disaster Exploration and Risk Assessment of Debris Flow at Toukeng Creek
Authors:	蔡念浯 Tsai, Nien-Wu
Contributors:	營建工程系碩士班林基源 Ji-Yuan Lin
Keywords:	堆積長度;重現期距;FLO-2D deposition length;recurrence interval;FLO-2D
Date:	2013-12-31
Issue Date:	2016-01-23 15:04:55 (UTC+8)
Abstract:	本研究利用FLO-2D二維數值模擬程式，搭配雨量資料及數值地形資料來模擬土石流之流動情況，包括流動速度、堆積深度及堆積範圍，堆積區之範圍與航空影像比對及堆積土方量與行政院農業委員會林務局之推估堆積區堆積土方量相近。本研究主要分為二部分來進行，第一步部分是FLO-2D數值模擬，模擬出的結果再利用瑞士災害程度分類之方法，進行重現期距10年、100年、500年以及重現期距結合之模擬情況，然後把土石流影響強度之分類劃分成三種等級，並將結果繪製成危險區域分佈圖。本研究第二部分使用池谷浩之堆積長度範圍劃設經驗式，劃設危險度分級分佈圖，研究結果顯示，直接把池谷浩公式使用在頭坑溪上明顯太過於保守，故將不同重現期距(10年、100年、500年)之堆積長度修正為計算值的三分之二，再將數值模擬與修正之池谷浩經驗式危險區域分佈圖套疊，提供做為日後居民及政府對土石流防治之參考。 In this study, a FLO-2D numerical model analysis was utilized with hydaulic data and DTM (Digital Terranin Modle) to simulate the debris-flow conditions. This simulation also took the flow velocities, flow depth and depostition area into consideration. Accumulated depisited volume in deposition zone is closed to the estemated numbers presented.This study was conducted in two different approachs. First part of the study is to sumulate the situations with FLO-2D. Results from the preliminary simulations were ultilized according to Swiss Hazardous Degree Classification in the further simulations which were conducted in the return period of 10-year, 100-year, 500-year and the return-period-combinations. Influential intensity of Debris-flow was classified into three categories, and the results were mapped as dangerous zone distribution.The second part of this study is to use the Deposition Length Demarcation Empiric Formular derived by Ikeya to demarcate the danger classification distirbution map. It is over concervertive to apply Ikeya’s formular to Touken Creek therefore, a safety factor of 1.5 was taken in claculation. The ultimate goal of this study is to put up a map with risk assessment with entire return periods, so that can be the reference for the debris-flow prevention for the residents and government.
Appears in Collections:	[營建工程系] 博碩士論文

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