桑干河阳原—涿鹿段地貌演化

Geomorphic Evolution of the Yangyuan—Zhuolu Section of Sanggan River,in Shanxi Province

桑干河发源于山西宁武县,向NE方向流经大同—阳原盆地和王家湾山地流入怀涿盆地。桑干河阳原—涿鹿段河流阶地发育较好,对其阶地的研究有助于更好地理解桑干河的演化及其流经区域的构造活动特征。而桑干河阳原—涿鹿段地貌演化对了解阳原古湖和怀涿古湖的演变有重要意义。本文通过遥感影像解译及对高分辨率DEM数据分析,结合实地测量,综合研究了阳原—涿鹿段桑干河阶地的发育特征。结果表明,该区的构造活动强烈,经历了断块差异性升降运动;受差异运动的影响,该段桑干河经历了被分为东西两支河流,最终又重新贯通的演化过程。

The Sanggan River originates from Ningwu county of Shanxi,flows over Datong—Yangyuan basin and Wangjiawan Mountains,and continues into Huaizhuo basin.The terraces are well developed in the Yangyuan—Zhuolu section of the Sanggan River,and it is helpful to understand the evolution of the Sanggan River and the neotectonic characteristics of the area.And it is significant for learning the evolution of the ancient Yangyuan lake and Zhuolu Lake to study the geomorphic evolution of Yangyuan—zhuolu section of the Sanggan River.Authors of this paper studied the terraces of YangYuan—zhuolu section of the Sanggan River comprehensively by field measurement,interpretation of remote sensing images and processing of high-resolution DEM data.The results show that the faults between mountain and basin activated intensely,and the area experienced block difference lifting movement.Under the influence of the differences of movement,the Sanggan River has experienced an evolution process that divided it into two rivers and eventually ran through again.