Effect of Using Different Methods for Calculating Topographic Factor on Sediment Yield Based on RUSLE Model (Case Study: Barajin Catchment, Qazvin)

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AZIZIAN A.; KOOHI S.

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Journal: IRAN-WATER RESOURCES RESEARCH Year:2019 | Volume:14 | Issue:5 Page(s): 283-294

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Title

Effect of Using Different Methods for Calculating Topographic Factor on Sediment Yield Based on RUSLE Model (Case Study: Barajin Catchment, Qazvin)

Author(s)

AZIZIAN A. | KOOHI S. | Issue Writer Certificate

Keywords

RSULEQ1

Digital Elevation Model (DEMs)Q1

DEM ResolutionQ1

Slope and Slope LengthQ1

Abstract

One of the most widely used methods for estimation of erosion over the catchment and the sediment yield is the revised universal soil loss equation (RUSLE). Previous research showed the importance of the topographic factor (LS), which includes slope steepness and slope length factors, in applying this equation. Over the past decades, different methods have been developed for the calculation of topographic factor and hence, choosing the best one is a confusing and challenging issue. Moreover, by increased use of geographic information system (GIS) application in hydrological modeling, mathematical calculations on grid-based datasets can easily be done in GIS environ. Due to depending on grid-based datasets, RUSLE model is influenced by several factors which among them, the effect of DEM Resolution and the method of LS estimation are the most important ones. This research addresses the effects of all important factors on sediment yield load at the outlet of the Barajin catchment by coupling the RUSLE model and GIS environ. Also, in order to evaluate the efficiency of this model, mean annual sediment delivery load is calculated by analyzing discharge-sediment curve and observed data at Barajin hydrometric station between 1987 and 2015. Findings showed that using different methods for estimation of LS factor without considering their limitations leads to a significant relative error (RE) in the calculation of sediment delivery load. Furthermore, it is shown that McCool et al (1989) and Moore-Burch (1986a, b) equations are the best methods for calculation of LS factor, due to an RE of lower than 10% in estimating the sediment yield. Also, investigating the effect of DEM Resolution indicated that the relative error in DEM Resolution results in 1. 5% to 58% RE in sediment load estimation.

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APA: Copy

AZIZIAN, A., & KOOHI, S.. (2019). Effect of Using Different Methods for Calculating Topographic Factor on Sediment Yield Based on RUSLE Model (Case Study: Barajin Catchment, Qazvin). IRAN-WATER RESOURCES RESEARCH, 14(5 ), 283-294. SID. https://sid.ir/paper/100193/en

Vancouver: Copy

AZIZIAN A., KOOHI S.. Effect of Using Different Methods for Calculating Topographic Factor on Sediment Yield Based on RUSLE Model (Case Study: Barajin Catchment, Qazvin). IRAN-WATER RESOURCES RESEARCH[Internet]. 2019;14(5 ):283-294. Available from: https://sid.ir/paper/100193/en

IEEE: Copy

A. AZIZIAN, and S. KOOHI, “Effect of Using Different Methods for Calculating Topographic Factor on Sediment Yield Based on RUSLE Model (Case Study: Barajin Catchment, Qazvin),” IRAN-WATER RESOURCES RESEARCH, vol. 14, no. 5 , pp. 283–294, 2019, [Online]. Available: https://sid.ir/paper/100193/en

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