利用GPS进行切沟侵蚀监测研究

切沟侵蚀在土壤侵蚀中占据重要位置,切沟侵蚀监测研究是切沟侵蚀研究的重要方面。目前进行切沟侵蚀监测研究主要利用摄影测量的方法,该方法存在一定的局限性。对利用GPS进行切沟侵蚀监测研究进行了探讨,对切沟在不同时间进行测量,获得多个时相的DEM,通过对比不同时相的DEM来获取该时间段的切沟侵蚀变化。最后以位于黑龙江省漫川漫岗黑土区的丰产电流域的一条切沟为研究实例,建立了2002,2003年10月两个时段分辨率为0.4 m的DEM,对比这两个时段的数据表明,该切沟沟头后退达13.78 m,侵蚀面积增大了711m~2,切沟的土壤侵蚀量增加了2377 m~3,展示了GPS在切沟侵蚀研究中精度高、速度快等优越性,可为切沟侵蚀监测研究提供参考。

Study of Monitoring Gully Erosion Using GPS

Gully erosion holds an important position in soil erosion, and monitoring the gully erosion is the major part of the study of gully erosion. Photogrammetry is mostly used in the study of monitoring gully erosion cur- rently, however, the method has limitations to some extent. This article the study of gully erosion using GPS was discussed by surveying the gully at different time, constructing the DEMs, and comparing the DEMs, the changes of the gully can be obtained. At the last part of the article, a case study of a gully at Fengchan Catch- ment, Heilongjiang Province is presented, the DEMs with resolution of 0. 4 m were constructed, and the dynamic changes of the gully between October 2002 and October 2003 were obtained, it shows that the gully retreated 13. 78 m, the erosion area expanded 711 m~2, and the erosion volume was 2 377 m~3. The case study exposes the ad- vantages of GPS survey in monitoring the gully erosion, and provides an alternative approach to monitoring the gully erosion.