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Zoratipour, A., Azadi, H. (2016). Experimental Investigation of Rill Creating Hydraulic Conditions in the Marl Rangelands in a Tilting Flume. Journal of Hydraulic Structures, 2(1), 12-26. doi: 10.22055/jhs.2016.12647
Amin Zoratipour; Hossein Azadi. "Experimental Investigation of Rill Creating Hydraulic Conditions in the Marl Rangelands in a Tilting Flume". Journal of Hydraulic Structures, 2, 1, 2016, 12-26. doi: 10.22055/jhs.2016.12647
Zoratipour, A., Azadi, H. (2016). 'Experimental Investigation of Rill Creating Hydraulic Conditions in the Marl Rangelands in a Tilting Flume', Journal of Hydraulic Structures, 2(1), pp. 12-26. doi: 10.22055/jhs.2016.12647
Zoratipour, A., Azadi, H. Experimental Investigation of Rill Creating Hydraulic Conditions in the Marl Rangelands in a Tilting Flume. Journal of Hydraulic Structures, 2016; 2(1): 12-26. doi: 10.22055/jhs.2016.12647

Experimental Investigation of Rill Creating Hydraulic Conditions in the Marl Rangelands in a Tilting Flume

Article 2, Volume 2, Issue 1 - Issue Serial Number 3, Summer and Autumn 2016, Page 12-26  XML PDF (1214 K)
Document Type: Research Paper
DOI: 10.22055/jhs.2016.12647
Authors
Amin Zoratipour 1; Hossein Azadi2
1Department of Landscape Engineering and Watershed Management, Ramin Agriculture and Natural Resources University, Ahvaz, Iran
2Department of Geography , Scientific Staff of Ghent University, Ghent, Belgium
Abstract
Generally, the evaluation and assessment of the critical condition of rill formation are useful for a better understanding of soil erosion processes. The inherence characteristics of soils, which have much dynamic variations on the hillslopes and are affected by rill formation, are the soil critical shear stress and soil erodibility factors. This study aims to assess experimental rill incision thresholds, the determined soil critical shear and soil erodibility factors on marl formation based on precipitation characteristics and different slope gradients on sensitive marl soil. The results showed that the rainfall intensity and slope steepness factors separately and together can significantly affect the distance from the point of rill initiation; runoff and rill start time and soil loss values. Rainfall intensity showed more importance than the slope gradient in the point of rill formation. There is a significant relationship between rainfall intensity and slope gradient with rill incision point, time of runoff start and rill start and soil loss. The point of rills formation (slope length) decreases with an increase in slope gradient and rainfall intensity. Finally, the results revealed that the values of soil erodibility factor (Kr) and critical shear stress of marl soil are 0.0015s m-1 and 0.267N m-2, respectively.
Keywords
Critical shear stress; soil erosion rate; rainfall intensity; slope gradient; marl
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