Critical Zone Mapping Based on Land Use and Slope Terrain Parameters, A Case Study of the Keureuto Sub-catchment

Abstract

Land use change, which contributes to a critical area, upstream of the Keureuto Sub-catchment is obvious based on previous studies. The critical area mapping is important for the watershed and land management considering the Keureto dam will be operated in the year 2024 at the downstream. The map can be categorized based on land cover, terrain slope, erosion risk classes, land productivity, and land management. The sub-catchment is prone to changes in all or any of these parameters. In this case, the initial critical zone map is developed for the 238 km2 Keureuto sub-catchment based on two parameters which are land use and terrain slope. Land use is produced from Landsat Satellite images from the years 2015 and 2021. Digital Elevation Model (DEM) data is used to produce terrain slope and sub-catchment boundary which the outlet is the Keureto dam. The analysis is based on overlaying the land cover and slope layer. Agricultural land covers part of the upstream area – steeper slope and middle – moderate slope of the sub-catchment increasing by about 8% within seven years. The critical zone mapping based on these two parameters is produced for a further study of the slope stability, the erosion risk, the watershed, and land management for the functionality of the Keureuto dam at the downstream site.