中巴经济走廊沿河台地特征及铁路选线要点

中巴经济走廊是我国"一带一路"倡议的先试区和重点项目区,拟建中巴铁路是其重要组成部分。走廊区域经历了多次强隆升作用和冰川作用,存在河流阶地、洪积扇、泥石流扇、冰碛台地等沿河台地。以中巴经济走廊Thakot至Khunjerab段为研究区段,归纳总结各类沿河台地的分布特征以及铁路选线的可利用性。结果表明:由于强隆升作用导致河流阶地拔河高度较大并出现了泥石流扇抬升后成为流通区的现象,Ⅰ级阶地和老扇面区成为可利用的地形;小冰期时冰川活动未企及的冰碛台地也可利用。研究结果有益于中巴铁路线路方案的优化。

Features of Platforms Along River in China-Pakistan Economic Corridor and Railway Location Points

China-Pakistan Economic Corridor is a pilot and key project of"The Belt and Road",and the proposedChina-Pakistan railway is an important part of this corridor.The corridor has experienced many times of strong upliftand glaciation,and there are some types of platforms along rivers such as river terrace,alluvial fan,debris flow fan andmoraine platform.The section from Thakot to Khunjerab of China-Pakistan Economic Corridor was selected as the studyarea,the distribution features of various platforms along the river and the availability of railway location weresummarized,and then the railway location points were presented.The results show that the height of terrace over riverbed is large and the debris flow fan becomes a circulation area as a result of strong uplift,then the first stage terrace andthe old fan area become available terrain.Moraine platforms which were not covered by glacial activity during the LittleIce Age are also available.The research results are beneficial for the optimization of China-Pakistan railway line scheme.