Establishing of Soil Loss Tolerance Limit and Sediment Yield in Zagros Fold Thrust Belt: A case study in the Kanarwe river basin, Iraq-Iran

Yıl 2025, Cilt: 176 Sayı: 176, 1 - 2

Fahmy O. Mohammed Ahmed Ibraheem Mohamed , Ibrahim H. Gart Diary A Amin

Öz

Soil degradation is a significant cause of topsoil loss; in most mountainous region watersheds, it leads to decreased agriculture productivity and reservoir storage. This study targeted calculating and mapping soil loss and sediment yield in the Lesser Zab watershed located between Iraq and Iran. The Revised Universal Soil Loss Equation (RUSLE) model was used to calculate the soil loss. A Digital Elevation Model of 30m, a Digital Soil map (1:500000), rainfall, and land cover were used to derive parameters. The soil loss rates are 58.1 and 0.1 t ha-1yr-1. The total annual soil loss is 1037289 tonnes, of these 404512, covering 75% of Kanarwe river basin land. Most of these affected lands are in the eastern and middle part, which is below the FAOs standard allowable for tolerable soil erosion. Still, the rest covers 25 % of the basin in the west with a total annual soil loss equal to 632777 tonnes, above FAOs standard. The maximum and minimum sediment yield is 29 and 0.1 tha-1yr-1, respectively. Based on the statistical correlation coefficient, the most effective RUSLE Ahmed MOHAMED parameters on sediment yield from high to low are topography 0.48, soil erodibility 0.38, and crop management 0.38.

Anahtar Kelimeler

RUSLE, Sediment Delivery, Zagros Thrust Zone, CN-SCS Curve, Dam Lifespan

Teşekkür

The authors deeply thank Dr. Chiara Piccini and Dr. Karwan Mustaf (University of Charmo) for their fruitful discussions. Also, would like to Dr. katepina giam (University of California), and Dr Anwar O. Mohmmed (University of Sulaimani) for proofreading the manuscript and finally thank Mr Rebar Qaradagh for providing valuable information about the geology and soil condition of the study area.

Kaynakça

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