好茶部落自然環(huán)境與土砂災害之探討

摘要： 好茶部落位處臺灣屏東縣北端霧臺鄉(xiāng)南側,緊鄰高屏溪流域之支流隘寮南溪旁,2005-2007年接連遭逢臺風暴雨使得部落周邊遭受嚴重之崩塌、土石流與洪水等災害.研究則以好茶部落歷史災害、環(huán)境地質、致災情形、肇災原因與河道蜿蜒變化.研究結果發(fā)現(xiàn)好茶部落周圍災害成因主要為降雨量過大、環(huán)境地質條件不佳與排水系統(tǒng)不良外,原河道寬度不足與河道主深槽差異致使河道縱橫向刷深擴大,以及部落位處河階堆積層,住戶距河道及邊坡之緩沖距離不足等因素有關.又因近年之雨季降雨量均超過年平均降雨量,致使好茶部落周邊地質條件變得較為軟弱,更易發(fā)生沖蝕崩塌災害.隘寮南溪河道變遷亦為造成好茶部落釀災因素之一;自集水區(qū)上游往下游運移之土砂,不僅抬高溪床,河道束縮段與河道蜿蜒處因洪流沖刷,使河道變遷與影響更為顯著. Abstract： The Houcha tribe is located in Wutai Township, Pingtung County of south Taiwan, adjacent to Ailiaonan river of the subsidiary current Kaoping river basin. From 2005 to 2007 series of typhoons and heavy rainfall make Houcha tribe suffered serious landslide, debris flow and flood disasters. Investigate and to discuss the history of disasters, environment geology, reasons of disasters and changes of river in this research. Study found that disasters caused by the excessive rainfall, bad environmental geological conductions, adverse drainage system, narrow river cross section and different stream depth, which were made the stream deeper and serious vertical and horizontal expansion erosion. As well as this tribe located in the deposit layer by the stream side, houses close to stream bank and hillside as inadequate buffer distance of such factors. Due to near 3 years rainfall data analyzed result, the annual rainfall in rainy season more than other region of Taiwan. With the result Houcha tribe was surrounding geological conditions become more vulnerable and more susceptible to erosion or landslide disaster. The sediments were transported from watershed upstream to downstream, not only to raise the stream bed, but also to change the topography, especially in narrow and curves area due to flood erosion. 作 者： 戴欣怡    許中立    DAI Shin-yi    HSU Chang-li   作者單位： 戴欣怡,DAI Shin-yi(屏東科技大學,坡地防災及水資源工程研究所,臺灣,屏東,912)

許中立,HSU Chang-li(屏東科技大學,水土保持系,臺灣,屏東,912) 

期 刊： 水土保持研究  ISTICPKU   Journal： RESEARCH OF SOIL AND WATER CONSERVATION  年，卷(期)： 2009, 16(6)  分類號： X171.1 P642.23  關鍵詞： 臺風    土石流    河道淤積    環(huán)境地質    Keywords： typhoon    debris flow    sediment transport    environment geology   

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