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Journal of Applied Sciences
Year: 2008  |  Volume: 8  |  Issue: 13  |  Page No.: 2435 - 2441

Investigation of Some Methodologies for Gully Erosion Mapping

Ali Mohammadi Torkashvand    

Abstract:

The aim of this study is to investigate the accuracy, error and precision of some models for providing erosion types map in Jajrood sub-basin, north-east Tehran, Iran. Seven models were applied for providing working units maps that four models were prepared by the integration of different data layers. Other models were photomorphic units map derived from processing satellite images, land units map and rocks erodibility map. Gully erosion intensity in 314 spots was investigated to provide the ground truth map. This map was crossed by the different working units` maps. Results indicated that the integration of land use, rocks erodibility and land units layers is a better model than other models of data layers integration from an economic and executive regards. Accuracy for this model and photomorphic units map was 89.8 and 89.0%, respectively. The least coefficient of variation (14.1%), consequently, the highest precision was related to photomorphic units` map. Land units and rocks erodibility models, because of their low accuracy and precision, are not suitable for providing gully erosion map. That is why the best model is photomorphic units map.

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