EVALUATION OF EROSION BASED ON GIS AND REMOTE SENSING FOR SUPPORTING INTEGRATED WATER RESOURCES CONSERVATION MANAGEMENT - Case Study: Manjunto Watershed, Bengkulu Province-Indonesia
ABSTRACT: Soil erosion is a
major environmental problem in the Manjuto watershed. This has economic
implications, as well as social and environmental consequences. The Key factors
contribute to the high annual rate of soil erosion are poor agricultural
prac-tices, high annual rainfall, and undulating topography. The aim of this
study is to evaluate the annual rate of soil erosion in Manjuto watershed by
identifying and calculating the risk of soil erosion using GIS, based on
digital elevation model (DEM). To find the status and level of soil erosion in
the watershed Manjuto, the annual rate of soil erosion is estimated using
remote sensing data. A Normalized Difference Vegetations Index (NDVI) derived
from remote sensing data (Spot-5) used in this study to assess the vegetative
cover. A soil erosion model developed for integrating NDVI and the slope of the
land to esti-mate the annual soil erosion rate. The erosion risk (TBE) rating
is performed in faction hierarchies. The results showed that the rate of soil
erosion has increased from 0.78 mm/year in 2000 to 1.78 mm / year in 2009. It
is concluded that SPT 41, 42, and 47 must be in a high priority, while SPT 2,
39 40, and 45 as medium priority to be conserved through erosion pre-vention program.
Author: Gusta Gunawan, Dwita
Sutjiningsih, dan Herr Soeryantono
Journal Code: jptsipilgg110017
