青藏高原东部冷曲河流域斜坡演化与地貌响应机制研究

From the perspective of the hillslope development and geomorphic evolution, we take the Lengqu River watershed in eastern Tibetan Plateau as research objective region. On the basis of detailed investigation, remote image interpretation, and laboratory test, the development characteristics, types, and genetic mechanism of slope deformation and large landslides will be analyzed. And the geomechanical modal also will be proposed, which reveal the hillslope developing processes at the erosive region in the internal Tibetan Plateau. The mineralogical, geochemical, and physic-mechanical parameters will be measured in fault (gouge) and landslide body materials, which can explain the relationship among the fault with slope deformation and large landslides. After that, the geomorphic evolution of Lengqu River, representative of the internal erosive region of Tibetan Plateau, will be reconstructed on the information of the geological data, terrace dating, and landslides dating. The geological modal of geomorphic evolution will be built based on developing processes of slope deformation and large landslides. Finally, the geomorphic response mechanism and geo-environmental evolution for the Tibetan Plateau with slope deformation and large landslides is revealed. The study hopes to provide theoretical and applied basis for regional disaster prevention and engineering safety with Sichuan-Tibet railway in Tibetan Plateau.

从斜坡与地貌演化的角度，以青藏高原东部冷曲河流域为研究区域，利用理论分析、遥感解译、现场调查和试验分析相结合的方法，系统研究斜坡变形、大型滑坡灾害发育特征、类型和成因机理，建立青藏高原内部强烈侵蚀区的斜坡变形和滑坡灾害的工程地质力学模型，揭示青藏高原内部侵蚀区的斜坡演化过程；开展对断层和滑坡体的矿物学、地球化学及物理力学参数测试，阐述断层与斜坡变形、大型滑坡的相互关系；结合地质历史信息、河流阶地测年和滑坡测年信息，重建青藏高原内部强烈侵蚀区的地貌演化历史过程，建立地貌演化与斜坡变形、大型滑坡之间的地质概念模型，揭示斜坡变形、大型滑坡与青藏高原地貌演化的响应机制和地质环境演变过程，为区域防灾减灾及川藏铁路建设提供理论支撑和科学依据。

青藏高原大型滑坡对青藏高原的交通建设、水电施工及库区运营具有重要的威胁，本项目从斜坡与地貌演化角度，对青藏高原东南部、东部作为研究区域，利用理论分析、遥感解译、野外调查、机器学习和实验分析相结合的手段，对青藏高原大型滑坡、斜坡变形进行光学遥感和地形标志识别，建立了青藏高原东南部、东部的大型滑坡的空间数据库，获取大型滑坡、斜坡变形的空间分布规律，归纳了滑坡空间位置预测发展趋势与挑战，梳理了滑坡空间预测条件因子重要性顺序，构建了滑坡空间预测的理论体系，并建立了青藏高原东部斜坡破坏的快速评价理论、危险性评估框架与流程，并揭示了河流下切过程导致滑坡灾害的地貌响应机制，为青藏高原地区防灾减灾提供理论指导，具有重要的应用价值。