Degradation and Rehabilitation of Natural Land

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Monfared K, Talebi A, Kiani-Harchegani M. Comparison of Tree Litter Effect on Hydrological Components of Sheet Erosion in Hillslopes with the Linear, Concave and Convex Profiles. Degradation and Rehabilitation of Natural Land 2021; 1 (2) :102-111
URL: http://drnl.sanru.ac.ir/article-1-173-en.html

Soil erosion is one of the most important environmental issues in the world, because it affects soil resources. Using crop or garden residues is an approach to prevent soil loss that acts as a protective layer, in addition to absorbing the kinetic energy of raindrops that can increase the shear strength of the soil surface and reduce erosion. Accordingly, the present study was planned with aims to compare the tree litter effect on the hydrological variables of sheet erosion in a parallel hillslope with linear, concave and convex profiles. This study was performed in laboratory conditions using a rainfall simulator. Then, the desired hillslopes were designed with different profile in the plot and filled with a sandy soil. Finally, under the 30 mm/h rainfall intensity, the amount of runoff volume and soil loss was measured in each storm event. The results showed that the total amount of runoff volume in the protected plot decreased by 34.74% and 2.79%, compared to the controlled plot of parallel-linear and parallel- concave hillslopes, respectively. Also, runoff volume in the protection plot increased by 4.29% compared to the control plot in parallel- convex hillslope. The amount of soil loss for parallel-linear, parallel-concave and parallel-convex hillslopes had 70.14%, 87.65% and 61.90% reduction in protection treatment compared to the control plot, respectively. Based on the results, the convex hillslopes have the maximum soil loss.