基于GIS平台的石羊河流域地貌演化r及构造活动性研究

摘要

Based on ARCGIS 10.2 platform, a 30 m GDEM based hydrological data analysis has been done to extract much drainage and sub-basin information and the drainage geomorphic parame-ters of the Shiyang river.We extracted the range of basin and focused on 8 sub-basin of the upper reaches of Shiyang river as a research to discuss.Afterwards, we studied the shape indexes ( Bs) , degree of asymmetry( AF) , and also calculated the integral value between elevations areas of sub ba-sin and water branching ratios.The results showed that the shape of basin was relatively regular and the activity of tectonic was relatively weak.The tilting degree of main basin was low and eastside was a bit weaker than west.While the changed trend of elevation—area integral values were from in-creasing to decreasing and then going up again.The branches present an opposite tendency, which reflected that the activity of tectonic east was weaker than west of Shiyang river.%基于ARCGIS 10.2平台,利用GDEM-30 m数据对石羊河流域进行水文分析,提取出了石羊河流域的流域范围,在此基础上通过研究区子流域的划分,把石羊河流域上游的8个子流域作为研究重点进行讨论.通过提取石羊河流域的地貌参数,包括盆地形状指数(BS)、盆地不对称度(AF)以及计算子流域高程—面积积分值(Hi)和水系分支比(Rb),并与前人活动构造研究成果对比.认为,石羊河流域盆地较为规则,且流域构造活动性相对较弱;主流域两侧掀斜程度低,且流域东侧稍弱于西侧;而流域高程—面积积分值从东往西呈逐渐增大的趋势,河流分支比则呈现出与之相反的变化趋势,综合反映了石羊河流域构造活动性不强,并且东部构造活动性弱于西部.