24 Aug 2018
Gully erosion is the most siginificant forms of land degradation. Gully distribution can indicate land degradation. Density level of gully shows the level of land degradation on a catchment. This research aims to identify the distribution of gully and to calculate density level of gully erosion in Kaliwungu Watershed. Distribution of gully and density level of gully was analyze based on land use map and landform map. In addition, analyze the characteristics of slopes, vegetation, infiltration, and land cultivation to determine the factors affecting gully erosion.The researchers was applying field survey to collect gully erosion data. Gully distribution was overlayed on land use map and landform map. Land use was delineated by interpretated aerial photograph of Kaliwungu Watershed. Aerial imagery with the support from the result of Sentinel image processing was used to observe vegetation density. Landform and slope were deliniated from Terra-SAR X DEM. Gully catchment was delineated by interpretated Terra-SAR X DEM and aerial photograph of Kaliwungu Watershed.Â Analysis to determine the factors that influenced gully was done descriptively. The analysis was conducted based on the result of overlay of gully distribution on land use map and landform map. The result of this research were map of gully distribution and map of density level of gully erosion in Kaliwungu Watershed with a scale of 1: 10.000. Gully erosion formed on erosin zone to deposition zone, but there were 3 gully that formed on residual zone. There were three density classes of gully in Kaliwungu Watershed which are high, medium, and low. The process of intensive gully takes place only at the some point with intensive land cultivation or land that has been highly disturbed by human activities such as settlements. The study result shows that land use and land cultivation was the factor that influenced the formation of gully erosion.
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