Assessment of soil erosion and watershed prioritization using empirical models EPM and MPSIAC (Case Study: Aro watershed)

Subject Areas : forest

reza bayat ¹ , maryam rostami ²

1 - عضو هیات علمی پژوهشکده حفاظت خاک و آبخیزداری تهران ایران
2 - دانشجوی دکتری علوم و مهندسی آبخیزداری دانشگاه تهران ایران

Received: 2016-01-05 Accepted : 2016-04-21 Published : 2016-05-21

Keywords: soil erosion, prioritization, MPSIAC model, Sediment, Aro Watershed, EPM model,

Abstract :

Abstract Identification,  evaluation  and  prioritization  of  different  areas  can  produce  valuable information for the watershed comprehensive plans, soil conservation and mitigation of the erosion types based on amount of erosion and sedimentation. This study used the MPSIAC and EPM models as a comparison and prioritization to estimate erosion and sediment   in   the   Aro   Watershed   Basin.   Required   data   regarding   the   natural characteristics  of  studying  the  watershed  basin  was  provided  from  comprehensive studies  of Hableh-Rood  basin  and  field  studies.  By using the required  factors,  the amount of erosion was calculated in both the models. In the MPSIAC model, erosion was calculated to be 451 m3/km2/y, whereas sediment was calculated as 233 m3/km2/y. However, the rate of erosion in the EPM model was estimated to be 378 m3/km2/y and for sediment, it was 200 m3/km2/y. The results showed that in some subbasins there was good correlation between the MPSIAC and EPM models, however in areas with high erosion the EPM model has less certainty than the MPSIAC model. The highest area was moderate class in the both of models and both of erosion and sediment in terms of spatial distribution. The results showed that EPM and MPSIAC model have not good agreement in the all classes. Prioritization of the hydrologic units showed that A4 unit in the EPM model and A-1-4-3 unit in the MPSIAC model allocated maximum of amount of erosion and deposition, in this area.

References:

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