基于3S的望谟县“6·06”特大山洪泥石流灾后土地复垦潜力评估

The Evaluation on the Land Reclamation Potential of Wangmo County after the'6.06' Serious Flood and Mudslide Disaster Based on 3S Technology

"6.06"特大山洪泥石流灾害使贵州省望谟县遭受严重损失。为了使灾区土地尽快得到复垦,科学合理地利用,通过实地调研,利用GPS获取典型受损地物点的空间位置,结合第二次国土调查图班、灾区地形图(1:10000)、政区图(1:50000)、Spot5遥感影像图、水文地质图信息,运用ArcView、ArcGIS和Erdas软件,对灾区土地复垦潜力进行评价,确定重点复垦区。结果表明:此次灾害使望谟县耕地受损严重,集中在河道两侧,被冲毁的强度受损耕地所占比例最大,其次为被压占的中度受损耕地和被水淹的轻度受损耕地;耕地受灾面积大,实际可复垦面积小;土地复垦潜力以河道两侧耕地为主,尤以水淹耕地复垦为主;灾区受损耕地复垦潜力被分成3级,复垦重点区域在乐旺镇和复兴镇;建议相关部门把灾毁耕地复垦工作及时推进,以保证粮食生产与供给。

The ＇ 6·06＇ serious flood and mudslide disaster in Wangmo County caused county. In order to make the investigations were carried out, damaged land be reclaimed and utilized scientifically GPS was used to collect the information of typical a serious damage the and reasonably, field damaged points, some maps including the second national land survey sub-compartments, the topographic maps （1：10000）, regionalism map （1：50000）, hydro-geological map, Spot 5 satellite images were used, and software including Arc View, Arc GIS and Erdas were used to analyze and evaluate the land reclamation potential and define the key reclamation areas. It was found that the cultivated land, especially those on both sides of the rivers were seriously among which the seriously damaged land washed out occupies the most proportion, then the moderate damaged, damaged land covered and the slightly damaged land flooded was the third; there were large areas being damaged, but a small amount could be reclaimed; the land with the highest potential for reclaiming was located on both sides of the river mainly in slightly damaged land flooded; the reclamation potential were divided into three grades, of which the key areas were Lewang Town and Fuxing Tow; it was suggested relevant departments promote the reclamation immediately to ensure the food production and supply.