Effect of hillslope topography on soil erosion and sediment yield using USLE model

Catchment hillslopes in nature have a complex geometry. Complex hillslopes have different plans (convergent, parallel and divergent) and different curvature (straight, concave and convex). In this study, the erosion rates of the nine complex hillslopes were investigated using the universal soil loss...

Full description

Saved in:
Bibliographic Details
Published in:Acta geophysica 2019-12, Vol.67 (6), p.1587-1597
Main Authors: Sabzevari, T., Talebi, A.
Format: Article
Language:English
Subjects:
Convergence
Curvature
Earth and Environmental Science
Earth Sciences
Erosion mechanisms
Erosion rates
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Mathematical models
Numerical models
Pixels
Research Article - Hydrology
Sediment yield
Shape effects
Slopes
Soil erosion
Soil investigations
Soil loss
Structural Geology
Topographic effects
Topography
Travel time
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Catchment hillslopes in nature have a complex geometry. Complex hillslopes have different plans (convergent, parallel and divergent) and different curvature (straight, concave and convex). In this study, the erosion rates of the nine complex hillslopes were investigated using the universal soil loss (USLE) method. The topography factor (LS function) in the USLE was developed as a function of plan shape and profile curvature. The hillslopes studied were divided into sets of complex pixels and the erosion over the pixels was calculated. Total erosion was regarded as the sum of erosion of all pixels. Furthermore, to calculate the sediment delivery ratio of each pixel, a new travel time equation for complex hillslopes was employed. Results showed that the mean erosion of convex hillslopes was 1.43 times that of concave and 1.19 times that of straight slopes. The effect of curvature shape on erosion was much greater than plan shape effect. The highest erosion belonged to convex divergent slopes, and the least erosion was related to concave divergent slopes. The laboratory results intended for validation of the numerical model also show that in hillslopes with fixed plan, the erosion rate in the convex hillslopes exceeds that of concave and straight hillslopes. Also, in the hillslopes with fixed curvature profile, the erosion rate in the convergent hillslopes is more than in the divergent and parallel ones.
ISSN:1895-6572
1895-7455
DOI:10.1007/s11600-019-00361-8