土石災害集水區之環境敏感區位分析－以雲林古坑華山地區為例

Environmental Sensitive Area Analysis for the Debris-hazard Watershed-A Case Study at the Hua-Shan Area in Ku-Keng County

林文賜(Wen-Tzu Lin) ； 羅健霖(Chien-Lin Lo) ； 廖紹安(Shao-An Liao)

《水保技術》 3卷2期 (2008/03) Pp. 95-104

https://doi.org/10.30040/JSWCT.200803.0005

摘要

古坑華山地區近幾年之超限利用問題為咖啡及檳榔(Areca catechu)大量種植，使山坡地過度開發，破壞水土保持，以致土石流災害頻傳。因此，古坑華山之環境敏感區位之探討，實為當前之重要課題。本研究整合該地區環境數值資料，及SPOT衛星影像判釋土地利用變遷資訊，藉由地理資訊系統、集水區分析及土地適宜性分析，劃設華山地區集水區環境敏感區位，探討不宜開發之潛在危險區位，與建物圖層套疊分析，探討建物之潛在危險性。透過AHP (Analytic Hierarchy Process)分析自然及人為因子之權重，以GIS結合土地適宜性分析該區之環境敏感區位，高敏成區之面積為8.24ha，約集水區之4.23%，次敏感區之面積為143.72ha，約佔集水區之73.48%，低敏感區之面積為42.84ha，約佔集水區之21.99%，該區建物(6183)主要分布於集水區出口處之次敏感區內，具有潛在危險性，可做進一步之探討。

關鍵字

環境敏感區位 ； 土地適宜性分析 ； 集水區分析 ； 層級分析法

並列摘要

TaThe study site, the Hua-Shan Area in Ku-Keng county, has planted many betel palms (Areca catechu) because of its high benefit. However, the root of betel palm is not deep enough to protect surface soil from erosion and landslide disasters. Therefore, the objectives of this study are to analyze the required digital data and detect land use change from SPOT satellites, and delineate environmental sensitive area at the Hua-Shan Area by using Geographic Information Systems (GIS), watershed analysis and land use suitability analysis. The extracted placements can be overlaid with the building coverage to delineate the potential dangerous buildings for the reference of slopeland disaster prevention. Firstly, the Analytic Hierarchy Process (AHP) model was used to calculate natural and artificial factors, and then GIS coupled with land-use suitability analysis for evaluating environmental sensitive area. The analyzed result shows that the areas (percent) of high, average and low sensitive placements are 8.24 ha (4.23%), 143.72 ha (73.48%) and 42.84 ha (21.99%), respectively. There are about 6183 m2 of buildings located at watershed outlet of average sensitive area. The potential hazard should be further evaluated and monitored.

並列關鍵字

Environmental sensitive area ； Land use suitability analysis ； Watershed analysis ； Analytic hierarchy process