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:: Volume 1, Number 2 (Autumn 2014) ::
3 2014, 1(2): 29-42 Back to browse issues page
Assessment of Critical Condition for Rill Initiation on Degraded Hillslope
amin zoratipour , hossein azadi, Jan Nyseen
assistant proffesor Ramin university
Abstract:   (1952 Views)
Generally, the evaluation and assessment 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 hill-slopes 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 run-off and rill start time and soil loss values. Rainfall intensity showed more importance than the slope gradient in the point of rill formation. Rainfall intensity and slope gradient have significant effect on the rill incision point, time of runoff start and rill start and soil loss variables. 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 0.0015 s m-1 and 0.267 N m-2, respectively.
Keywords: Critical shear stress, soil erosion rate, rainfall intensity, slope gradient, marl
Full-Text [PDF 968 kb]   (435 Downloads)    
Type of Study: Research | Subject: Watershed management and rainwater harvesting
Received: 2014/12/29 | Accepted: 2015/07/11 | Published: 2015/07/11
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zoratipour A, azadi H, Nyseen J. Assessment of Critical Condition for Rill Initiation on Degraded Hillslope. 3. 2014; 1 (2) :29-42
URL: http://jap.haraz.ac.ir/article-1-37-en.html
Volume 1, Number 2 (Autumn 2014) Back to browse issues page
نشریه علمی - پژوهشی هیدرولوژی کاربردی Journal of Applied Hydrology
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