基于GIS的三峡库区湖北段土壤侵蚀潜在危险度评价

发布时间：2018-06-11 19:09

本文选题：GIS + 土壤侵蚀　；参考：《水利水电技术》2017年09期

【摘要】：以GIS为支撑,选取三峡库区湖北段为研究区,采用修正通用土壤流失方程与抗蚀年限法相结合的方法,计算和分级评价了研究区土壤侵蚀潜在危险度,并根据生成的土壤侵蚀潜在危险度分布图,探讨不同高程、坡度、土壤等侵蚀背景条件下的土壤侵蚀潜在危险度空间分布特点。结果显示,研究区土壤侵蚀潜在危险度以无险型和轻险型为主,占总面积的96.27%,主要分布在巴东南部、兴山北部和夷陵区东南部;危险型面积相对较小,主要分布于山丘中上部;极险型和毁坏型面积很小,零星分布在生态环境脆弱、土层薄、植被覆盖率低的荒岭坡地上。综合不同侵蚀背景分析表明,200~500 m高程带危险度最大,35°坡度带侵蚀程度最严重,石灰土和紫色土地区土壤侵蚀危险度指数SEPDI值最高。
[Abstract]:With GIS as the support and Hubei section of the three Gorges Reservoir area as the study area, the potential risk degree of soil erosion in the study area was calculated and graded by combining the modified general soil erosion equation with the corrosion resistance years method. According to the distribution map of soil erosion potential risk, the spatial distribution characteristics of soil erosion potential hazard under different soil erosion background conditions such as elevation, slope and soil were discussed. The results showed that the potential risk of soil erosion in the study area was mainly non-risk type and light risk type, accounting for 96.27% of the total area, mainly distributed in southeast of Pakistan, north of Xingshan and southeast of Yiling area, and the risk type area was relatively small, mainly distributed in the middle and upper part of the hill. The extremely dangerous type and the destruction type area are very small, scattered distributes in the ecological environment fragile, the soil layer is thin, the vegetation coverage is low on the wasteland slope land. The analysis of different erosion background shows that the maximum risk degree of the 500 m elevation zone is the most serious, and the soil erosion risk index (SEPDI) of lime soil and purple soil is the highest.
【作者单位】：长江科学院水土保持研究所;中国水利水电科学研究院泥沙研究所;黄河水利委员会绥德水土保持科学试验站;
【基金】：国家自然科学基金青年基金(51209014) 中国科学院科技服务网络计划(STS计划)项目(KFJ-EW-STS-087)
【分类号】：S157.1

【相似文献】