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Published on: February 13, 2015
Application of hydrological indices for erosion hazard mapping using Spatial Analyst tool
Imran Ahmad1, Mithas Ahmad Dar2,3, Afera Halefom Teka1
1Department of Hydraulic and Water Resources Engineering, Debre Tabor University, Debre Tabor, Ethiopia.
This study mapped erosion-prone areas using hydrological indices and a digital elevation model in Ethiopia. Results identified 33.14 km² in severe erosion zones requiring immediate conservation efforts.
Area of Science:
- Environmental Science
- Hydrology
- Geomorphology
Background:
- Geographic Information Systems (GIS) are crucial for mapping erosion-prone areas.
- Digital Elevation Models (DEM) provide essential hydrological indices for erosion modeling.
- Understanding erosion risk is vital for effective watershed management.
Purpose of the Study:
- To utilize hydrological indices derived from a DEM for mapping erosion-prone areas.
- To assess erosion hazard levels within the Abay sub-basin, Ethiopia.
- To demonstrate the effectiveness of integrated GIS analysis for watershed management.
Main Methods:
- Processing and analyzing a DEM to derive hydrological indices (Sediment Transport Index, Compound Topography Index, Stream Power Index).
- Overlaying derived indices with other spatial themes (slope, curvature, channel distance/density) using Weighted Sum in GIS.
- Applying Spatial Analyst tools for integrated erosion vulnerability assessment.
Main Results:
- Identified 33.14 km² of the Abay sub-basin in a very high/severe erosion zone requiring immediate conservation.
- Quantified erosion hazard zones: 98.26 km² (high), 153.40 km² (moderate), and 263.17 km² (low).
- Demonstrated the power of DEM derivatives and morphometric parameters in demarcating erosion zones.
Conclusions:
- The integrated approach using DEM derivatives and GIS is a powerful tool for mapping erosion vulnerability.
- The methodology can be applied at regional and continental scales for effective watershed management.
- Urgent conservation measures are needed for severely eroded areas in the Abay sub-basin.
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