甘肃东部滑坡遥感调查分析评价

以TM数据为基础资料,结合SPOT图像及航片、地形图、地质图,建立了滑坡遥感解译标志,对甘肃东部滑坡进行了遥感调查。分析了滑坡分布特征,将滑坡分为2个大区8个小区。根据滑坡的密度、规模、危害程度,对以上地区进行了危险度评价并划分出三个等级:Ⅰ级极危险区有兰州—定西滑坡带、临夏—渭源滑坡带、通渭—秦安—清水滑坡带、舟曲—武都白龙江滑坡带;Ⅱ级危险滑坡带有武山—天水滑坡带、礼县—成县嘉陵江上游滑坡带;Ⅲ级危险区有华亭—崇信滑坡带、环县—庆阳滑坡带。

Analysis and Evaluation on Remote Sensing Survey of Landslide in Eastern Gansu Province

The paper establishes remote sensing interpretation labels of landslid e and conducts remote sensing survey of landslides in the eastern of Gansu by ta king TM data as the primary information and combining with SPOT images, aerial p hotos, topographical and geological maps. It analyzes the characteristics of lan dslide distribution and divides the landslide into 2 regions and 8 sub-regions. It evaluates the degree of endangering of the above regions and divides them in to three grades based on the density, scale and degree of endangering: Grade I o f extremely danger area includes the landslide zones of Lanzhou-Dingxi, Linxia -Weiyuan, Tongwei-Tai’an-Qingshui and Bailongjiang of Zhouqu-Wudu; Grade II of danger area includes the landslide zones of Wushan-Tianshui and upper strea m of Jialin River in Lixian-Chengxian and; Grade III of danger area includes th e landslide zones of Huating-Chongxin and Huanxian-Qingyang.