USING THE GAVRILOVIC MODEL TO ESTIMATE SOIL EROSION IN THE AL-ZIYADI BASIN USING GEOGRAPHIC INFORMATION SYSTEMS (GIS)
Keywords:
water erosion, EPM model, geographic information systemsAbstract
The Wadi al-Ziyadi basin is part of the Hamrin Hills region extending as a strip surrounding the alluvial plain from the east, parallel to the Zagros Mountain range, Mount Qalaat Waizan in Iranian territory. The area of this basin is about 62.58 km2 . The climate of this region is characterized by a dry and semi-arid climate, while the upper sources are the basin extends in Iranian lands that receive rainfall exceeding (290) mm annually within the humid climate that supplies the basin with water. The slope is more than 87 degrees. The aim of this research was to estimate the extent of soil erosion towards the mouth of the valley, and systems were used. Geographic information (GIS) in order to apply the equations of the EPM model. The results extracted from the application of this model show that the most important factors affecting the intensity of erosion depend on terrain indicators as well as climatic factors (rain and temperature), while the Z factor for potential erosion reached about (0.2- 1.6), and the extent of erosion in the valley amounted to about (95.5-31,900) of the total basin area, and this confirms that most of the basin area is exposed to severe erosion according to the EPM model .
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