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[1]DAI Shin-yi,HSU Chang-li.Discussion of Natural Environment and Sediment Disasters in Houcha Tribe Area[J].Research of Soil and Water Conservation,2009,16(06):265-270.

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Discussion of Natural Environment and Sediment Disasters in Houcha Tribe Area

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 16 Number of periods: 2009 06 Page number: 265-270 Column: Public date: 2009-12-20

Title:: Discussion of Natural Environment and Sediment Disasters in Houcha Tribe Area

Author(s):: DAI Shin-yi¹, HSU Chang-li²; 1. Graduate Institute of Disaster Prevention on Hillslopes and Water Resources Engineering, National Pingtung University of Science and Technology, Pingtung, Taiwan 912, China;
2. Department of Soil and Water Conservation, Pingtung University of Science and Technology, Pingtung, Taiwan 912, China

Keywords:: typhoon; debris flow; sediment transport; environment geology

CLC:: X171.1;P642.23

DOI:: -

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.

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