Sediment yield and soil erosion assessment by using empirical models for Shazand watershed, a semi-arid area in center of Iran

Ali M. Rajabi (), A. Yavari () and A. Cheshomi ()
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Ali M. Rajabi: University of Tehran
A. Yavari: University of Qom
A. Cheshomi: University of Tehran

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2022, vol. 112, issue 2, No 28, 1685-1704

Abstract: Abstract Today, the assessment of erosion and sediment yield of catchments is among the fundamental issues in water resources management and environmental problems in developing countries. In this regard, empirical methods have received much more interest than other methods due to the lack of reliable hydrometric and partially precise data, especially for long periods of time. In this paper, the intensity of soil erosion and sediment yield is assessed using Modified Pacific Southwest Inter-Agency Committee (MPSIAC) and Erosion Potential Method (EPM) models in Shazand basin (one of the sub-basins of Saveh dam in the center of Iran) and is compared with the hydrometric method. For this purpose, the study area was simulated with the Geographic Information System (GIS) and Remote Sensing (RS) techniques using the basic 10 m × 10 m cell size maps. The required parameters for MPSIAC and EPM models were defined in ArcGIS 10.2 and Envi 5.1. Then, soil erosion zonation map and sediment yield value were obtained by 2 models and validated by hydrometric outputs. The results of MPSIAC model show that sediment yield in Pol-e Doab, Bazaneh, Tureh and Azna stations are 365,493.26, 47,879.56, 46,291.95 and 40,005.25 tons per year, respectively, while using EPM model they are 288,103.81, 18,963.83, 43,079.2, and 20,583.76 tons per year, respectively. The comparison between MPSIAC model and hydrometric results in Pol-e Doab, Tureh, and Shazand shows agreement levels of 91, 73 and 94%, respectively, and 100% incompatibility in Bazaneh station. In comparison, the difference between EPM model and hydrometric results in Pol-e doab, Bazaneh, Tureh and Shazand stations shows agreement levels of 86, 82, 48 and 79%, respectively. Based on the obtained results, EPM model has higher compatibility in maximum sediment yield prediction, whereas MPSIAC model shows a better ability to create soil erosion zonation mapping with 10 m × 10 m cell size accuracy.

Keywords: Erosion; GIS; MPSIAC; EPM; Shazand watershed; Remote sensing; Sediment yield (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1007/s11069-022-05244-8

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