构造差异隆升影响下顺构造地貌发育强度对大型滑坡的控制机理和孕灾模式-以美姑河流域为例

位于青藏高原东部边缘的美姑河流域构造差异隆升强烈，发育典型新生顺构造地貌，以向斜谷和背斜山为特征。这里大型滑坡分布广、数量多、成灾模式独特、成因机理复杂。如何揭示顺构造地貌区褶皱变形强度和构造隆升差异复合作用下大型深层滑坡发育的成灾模式和控制机理是我国防范特大滑坡灾害的需要，也是国际滑坡研究的前沿课题。本项目拟通过野外精细调查、系统年代学测定和多种交叉学科方法，重建美姑河流域古滑坡发生和阶地演化时间序列，分析大型滑坡发育的时空规律及成因机制；针对流域内顺构造地貌的特殊性，查清顺构造地貌区不同强度的褶皱变形和构造差异隆升复合作用下大型滑坡发育演化的控制机理和孕灾模式；通过流域内构造—地貌—滑坡发育过程分析，揭示大型滑坡发育的主控因素，提出大型滑坡孕灾-发生的判识和预测指标体系，识别潜在滑坡灾害风险隐患区，为美姑河流域及周边类似地区滑坡灾害早期识别、空间预测和风险防范提供科技支撑。

The Meigu River watershed located at the eastern edge of the Tibet Plateau and has a strong structural uplift and forms a typical new coincident tectonic landform, where is characterized by oblique valleys and anticline mountains, and the large-scale landslide has unique disaster models and complex genetic mechanisms in the region. How to reveal the disaster model and controlling mechanism of large-scale deep landslides under the combined with fold deformation strength and tectonic uplift in the coincident tectonic landform area that is important to prevent landslide hazards in China, and also is a frontier topic in international landslide study area. Therefore, the project intends to reconstruct the time series of ancient landslide occurrence and terrace evolution in the Meigu River watershed by field fine survey, systematic chronology measurement and other variety of interdisciplinary methods, then analyze the temporal and spatial development characteristics and genetic mechanism of large-scale landslide; Secondly, according to the particularity of the coincident tectonic landform in the region, the controlling mechanism and the disaster model of large-scale landslides evolution under the combination of fold deformation at different strength and the structural difference uplift in the coincident tectonic landform region；Thirdly, the tectonic difference uplift-geomorphic dynamic evolution-landslide development process are analyzed that to reveal the main controlling factors of large-scale landslide, and the identification and prediction index system of large-scale deep landslides is proposed, the potential risk area of landslide disasters is also identified. All this purposes are providing technical support for early identification, spatial prediction and risk prevention of landslide hazards in the Meigu River watershed and nearby similar areas.