Abstract
Specific effects of topography over any area watershed erosion are estimated through the LS factor as the product of slope length L and slope steepness factor S using RUSLE equation. The LS factor map of Euphrates watershed was derived from the raw Digital Elevation Model (DEM) by using of ArcMap 10.2 software, the DEM images were provided from United State Geological Survey (USGS) website. The DEM were consisting of sixteen images with cell resolution of 30m*30m, the DEM of Euphrates watershed is ranged from -100 m to 466 m, 98.83% of Euphrates basin area of DEM within the range 0 to 457 m. The slope in percentage rise map of Euphrates watershed is required to estimate the LS factor, the most of slope of this study was ranged from zero to five which represent about 93.12% from total area of basin. The LS factor of Euphrates basin is ranged from (0) to (8010.61), 94.25% of Euphrates watershed area have the LS factor of the range from (0) to (1). Furthermore, the LS factor values more than 500 of watershed have a small area, so the factor value can be considered up to 500 and neglect the other large values of LS factor. The LS values more than 3 were identified the lines of Euphrates river, distributary channel, rills, interrill and gully.
Highlights
Wind and water are the main reason to remove the soil surface materials, this meaning is soil erosion losses (Kirkby and Morgan 1980)
The topography effective on soil erosion modeling in Revised Universal Soil Loss Equation (RUSLE) equation can be shown in the slope length factor L and the steepness factor S
The definition of the ratio of soil loss erosion from field slope to that drom 9% slope under the specify conditions, the S factor of RUSLE equation is shown in equations below (McCool et al, 1987; McCool et al, 1997; Renard et al, 1997): S = 10.8 × sin θ + 0.03 σ ≤ 9%
Summary
Wind and water are the main reason to remove the soil surface materials, this meaning is soil erosion losses (Kirkby and Morgan 1980). The topography effective on soil erosion modeling in RUSLE equation can be shown in the slope length factor L and the steepness factor S. The definition of the ratio of soil loss erosion from field slope to that drom 9% slope under the specify conditions, the S factor of RUSLE equation is shown in equations below (McCool et al, 1987; McCool et al, 1997; Renard et al, 1997):. The 10% error in the slope length is resulted of the value 5% error in calculated soil erosion, while the same error in the slope steepness will be given the 20% error in computed soil losses erosion (Morgan 2011). The exponent value m can be taken that 0.4 while the value of n can be taken equal to 1.3 (Moore et al; 1993, Jain & Kothyari; 2000 and Van der Knijff et al; 2000)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
