Evaluation of Shirazi model in estimating the erodibility of loess lands

Subject Areas : Watershed

نادر جندقی ¹ , مجتبی قره محمود لو ² , حجت قربانی واقعی ³

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Received: 2023-03-11 Accepted : 2023-06-10 Published : 2023-08-30

Keywords: Golestan province, استان گلستان, Erodibility, فرسایش پذیری, Shirazi Model, Loess Soil, مدل شیرازی, خاک لس,

Abstract :

To perform this research, after the initial studies, the components of the land unit in the study area (including river terrace, loess plateau and hill) were selected as the working unit. For this purpose, 48 surface samples (0-10 cm depth) were collected. Soil physicochemical properties including soil texture were measured in the laboratory. Then, soil erodibility was estimated by Shirazi model. In this research, the soil actual erodibility was measured using rain simulator in the field (in plots of 1 m2). Then, spatial changes of soil erodibility in the study area were plotted using GIS software and reverse distance weighing (IDW) method. The results showed that in all 3 types of soil in this area, the use of Shirazi model was overestimated compared to the actual data. The amount of this overestimation was measured in river terrace, loess plateau and hill type by 8.56, 14.66, and 10.6 times, respectively.

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