黄土高原西南部陇县—千阳一带崩塌、滑坡地质灾害的遥感影像特征及分布规律

Remote sensing images and distribution characteristics of avalanche and landslide geohazards in the western part of the Weibei Plateau,Shaanxi Province,China

渭北高原西段新构造活动强烈,崩塌、滑坡地质灾害频繁发生。通过1∶5万专题遥感解译和重点地质调查,全区遥感解译崩塌、滑坡地质灾害点共计611处,其中大型滑坡17处、中型滑坡194处、小型滑坡385处,小型崩塌15处。结合区域地理、地质环境特征,将区内大、中型滑坡地质灾害点划分为5个集中分布区、6个集中分布带。区内崩塌、滑坡地质灾害主要受地形地貌、新构造与岩性条件的控制,以地质灾害点集中分布区、带为基础,参考重点地质灾害点的影响范围及人类活动的状况,将千阳县城关镇—崔家头镇、陇县杜阳镇—千阳县草碧镇、陇县峡口河—杨河沟地区列为地质灾害防治监测重点地区。

Neotectonic activity is intense and avalanches and landslides take place frequently in the western part of the Weibei Plateau 1：50000 special-subject remote-sensing interpretation, geological survey in key areas and remote-sensing interpretation in the whole region show that there are a total of 611 avalanche and landslide geohazards, including 17 large-sized landslides, 194 medium-sized landslides, 385 small-sized landslides and 15 small-sized avalanches. According to regional geography and geo-environmental characteristics, largeand medium-sized landslide points in the region are dived into five concentrated distribution areas and six concentrated distribution zones. The landslides geohazards are mainly controlled by landforms, neotectonics and lithology. On the basis of geohazard centralized distributing areas and zones and by referring to the influence scope of key geohazard points and human activities, the Chengguan Township-Cuijiatou Township （Qianyang County）, Duyang Township （Longxian County）-Caohi Township （Qianyang County） and Xiakouhe-Yanghegou （Longxian County） areas are listed as the key areas of geohazard prevention, control and monitoring.