基于OLI和ASTER GDEM数据的云南昌宁县滑坡、泥石流易发度评价

EVALUATION OF LANDSLIDE AND DEBRIS FLOW SUSCEPTIBILITY IN CHANGNING,YUNNAN PROVINCE BASED ON OLI DATA AND ASTER GDEM

滑坡、泥石流敏感性是指区域在自然状况下发生滑坡、泥石流现象的可能性大小。以OLI影像、ASTER GDEM为数据源,选取强降水、地表坡度、地表植被覆盖和河流侵蚀等因子为评价指标,在遥感、地理信息系统技术的支持下,开展云南昌宁县滑坡、泥石流易发程度评价。结果显示:昌宁县滑坡、泥石流易发度分为不易发、轻度易发、中度易发和高度易发4个等级,各等级所占面积分别为:12.42 km2、2 055.61 km2、1 584.98km2、89.64 km2,比例为:0.33%、54.92%、42.35%、2.40%。空间分布上,中度易发区在田园镇中部、漭水镇中部和南部、鸡飞镇东北部、卡斯镇中部及东部、柯街镇西部、珠街乡东部和北部、以及更戛乡东部及南部地区分布相对集中;高度易发区则集中分布于北部黒惠江、中部右甸河及南部勐统河各支流上游山区,由北向南形成"川"字型分布。

The susceptibility of landslide and debris flow is the possibility of the occurrence of landslide and debris flow in the natural condition. Evaluated landslide and debris flow susceptibility in Changning, Yunnan Province, by selecting OLI images, ASTER GDEM data as data sources, the heavy rainfall, the land slope, the vegetation coverage and the stream erision as the evaluation index, with the support of remote sensing, geographic informa- tion technology. The result shows that there are four grades of landslide and debris flow disaster prone in Changn- ing county, respectively are can＇t prone, mild prone, medium prone and highly prone, the area of each grsde is 12.42 square kilometer, 2055.61 square kilometer, 1584.98 square kilometer, 89.64 square kilometer, the ra- tio are 0. 33%, 54.92%, 42. 35%, 2.40%, respectively. In the spatial distribution, moderate prone araes are mainly distributed in the central of TianYuan town, the central and south of MangShui town, the northeast of JiF- ei country, the central and south of KaSi town, the west of KeJie town, the northeast and north of ZhuJie coun- try, the east and south of GengGa country; highly prone are concentrated distribution in the upriver mountainous area of Black Hui jiang in the north of changning county, YouDian river in the central of changning county and MengTong river in the southern changning county , formed ＂chuan＂ type distribution from north to south.