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| 基于遥感技术的土壤侵蚀研究现状及实例分析 | |
| 引用本文： | 卫亚星,王莉雯,刘闯.基于遥感技术的土壤侵蚀研究现状及实例分析[J].干旱区地理,2010,33(1). |
| 作者姓名： | 卫亚星 王莉雯 刘闯 |
| 作者单位： | 1. 辽宁师范大学海洋经济与可持续发展研究中心,辽宁,大连,116029 2. 辽宁师范大学城市与环境学院,辽宁,大连,116029 3. 中国科学院地理科学与资源研究所全球变化信息研究中心,北京,100101 |
| 基金项目： | 辽宁省教育厅人文社会科学研究项目，教育部人文社会科学重点研究基地项目基金 |
| 摘 要： | 通过介绍卫星和传感器在土壤侵蚀研究中的应用情况,讨论了用遥感图像探测土壤侵蚀特征、土壤侵蚀区域和土壤侵蚀沉积的很多应用实例,然后利用甘肃河西走廊黑河上游1987年的TM数据和1999年的ETM数据,计算出了两个时期的植被盖度,同时结合DEM数据得出的坡度值,然后根据水利部的土壤侵蚀分级标准,获得了两个时期的土壤侵蚀图,对比分析了1987年和1999年两个时期的不同等级侵蚀强度区域的面积变化.研究结果显示,甘肃河西走廊黑河上游存在中度侵蚀的区域位于坡度大于15°的地方,这些地方也是我国西部退耕还林还草的重点区域. |
| 关 键 词： | 遥感 土壤侵蚀 甘肃 数字高程模型 |
Case analysis and status of erosion detection based on remote sensing technology |
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| Abstract: | Remote sensing technologies have been used in erosion research for many years, satellite image was ap-plied in many respects of erosion assessing during the past 30 years. Satellite data can be directly used for detecting erosion and its consequences. Distinguishing the total feature of erosion can divide erosion regions. And then detec-tion results can be achieved by assessing erosion intensity based on empirical relations. In this paper, applications of satellite images and sensors in erosion were discussed, and many examples of detecting erosion features, eroded areas, and erosion consequences by remote sensing were presented. In this research, TM data of 1987 and ETM data of 1999 in the Hexi Corridor of Gansu Province of China was used to figure out vegetation coverage in two peri-ods. Meanwhile, slope values in the research region were acquired from DEM. Then according to soil erosion level standards, soil erosion maps both in 1987 and in 1999 were made out utilizing decision tree classification algorithm.Area changes and driving forces of different level erosion density region were analyzed from 1987 to 1999. The re-search result is that medium erosion regions in upriver Heihe of Hexi Corridor in Gansu are located in the slope whose slope value exceeds 15°, and these regions are also important areas which have been changed into forest and grassland from previous cropland. So it is significant to prevent soil erosion in upriver Heihe. Digital Elevation Model data indicates that the area whose slope is less than 5°accounts for 78% and the area whose slope is greater than 15°accounts for 10%, so most regions in Hexi Corridor are flat. The research indicates the sparse vegetation region accounts for most regions of Hexi Corridor, and its area accounts for 80%. The area of the Mingle Oasis is very small, so it is very important to protect vegetation in this region. |
| Keywords: | remote sensing erosion Gansu Digital Elevation Model |
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