青海共和盆地威连滩冲沟侵蚀遥感监测的初步结果

Preliminary Results of Gully Erosion by Remote Sensing Monitoring in Weiliantan,Gonghe Basin,Qinghai Province

利用2006年高分辨率的快鸟影像和1982年的航空像片,结合GPS雨季前后精确测量数据,在GIS软件支持下,对青海共和盆地沙沟河流域的一个典型冲沟,从不同时间、空间尺度上对冲沟侵蚀进行动态监测研究。初步结果表明:冲沟的侵蚀速率快,主要表现在沟头的溯源侵蚀;冲沟的沟型基本没变化,但沟头变化明显;预测冲沟以每年12m速度发展是可信的,并指出冲沟侵蚀给当地村民的生产、生活以及龙羊峡水库带来了较为严重的危害。

By high resolution imageries of Quick Bird in 2006 and airphotos in 1982,together with exactly measured data by GPS before and after rainy season,a typical gully,which locates in Shagou River basin,Gonghe Basin,Qinghai Province,was monitored dynamically on different spatial and temporal scales in support of the GIS software.Preliminary results show that：the erosion rate of gulch is high,which mainly presents in the form of headward erosion.Shape of gully varied little,but the gully head varied obviously.It is credible that the gully expands at the speed of 12 m/a.Moreover,the authors point out the gulch erosion does serious harm to local villagers＇ life and production and Longyangxia reservoir.