Application of Remote Sensing and GIS Tools in Delineating Environmentally-delicate-Areas for Optimum Land Use Planning: A Case Study

摘要

The main objective of the study was two-fold. First, to prepare detailed land-use/ land-cover maps on 1:25000 scale and infer the availability of natural resources and to prepare an optimum land-use plan on 1:25000 scales. Second, to delineate and prioritize the micro watersheds of the entire catchments area of the wetland from soil erosion perspective so that the first problem of siltation of the natural drainage can be properly addressed. The total watershed area contributing water to the wetland system was about 5614.31 ha. The core waterlogged area of the wetland ecosystem having an area of 1750 ha (31.46 %) was covering five revenue villages. Two basic themes of Land-use/land cover and Slope and watershed prioritization had been prepared. Based on the weighted parameters of SBI, NDVI, slope and other watershed characteristics, twenty micro watersheds were analyzed falls in the study area. This micro watersheds had been categorized as low priority (807.53 ha), medium priority (1575.18 ha), high priority (2372 ha) and very high priority (859.60 ha). Considering three field parameters such as slope, circularity ratio and drainage density as well as two remote sensing parameters such as NDVI and SBI, priority for treatment of each of the twenty micro-watersheds was assigned.