PREDICTION OF SEDIMENT DELIVERY RATIO IN A SMALL AGRICULTURAL WATERSHED

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AMIN S.A.; GAROUSI A.; SHIRVANI AMIN

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Journal: Iran Agricultural Research Year:2002 | Volume:21 | Issue:2 Page(s): 157-172

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Information Journal Paper

Title

PREDICTION OF SEDIMENT DELIVERY RATIO IN A SMALL AGRICULTURAL WATERSHED

Author(s)

AMIN S.A. | GAROUSI A. | SHIRVANI AMIN | Issue Writer Certificate

Keywords

AGRICULTURAL WATERSHEDSQ3

ANSWERS MODELQ3

IRANQ3

SEDIMENT DELIVERY RATIOQ3

SHIRAZQ3

SOIL EROSIONQ3

Abstract

Due to sediment deposition, overall sediment Yield is usually less than soil loss from the soil surfaces of a watershed. The ratio of sediment yield at a watershed outlet to gross erosion within it is usually referred to as the SEDIMENT DELIVERY RATIO (SDR). Since the relationship between detachment and transport of the soil particles is not linear for each storm, simulation of SDR was performed on an individual storm basis using the ANSWERS MODEL modified for prediction of the SDR in a small 'agricultural watershed (3.62 ha) located in south of IRAN with an average slope of 2.6% and fallow conditions. Data from independent rainfall events during 1994 to 1997 were analyzed. Stepwise regression analysis showed that SDR was correlated with antecedent soil moisture content (ASM), maximum suspended solids concentration of runoff (Cmax), and mean rainfall intensity (Imean), (p= 0.001). Because it was expected that the total runoff volume would also make a significant contribution to SOIL EROSION and SDR, the effect of the runoff volume of each storm was also tested. Further stepwise regression analysis showed not only a higher coefficient of determination (R2= 0.90) but also a higher significant level introducing other variables, Le. Runoff volume (a³0.53). In the case of introducing runoff volume as a new variable in the regression equation the model was an artificial one. However, the relationship between SDR and the watershed hydrological properties best represents the situation of SOIL EROSION in our study area. For other watersheds of different sizes, soils, and slope characteristics, more research is necessary to investigate the relationship between SDR, watershed characteristics and climatological conditions. The overall average SDR for the watershed under study was 54.70%, which can be recommended for estimation of SOIL EROSION an9 sedimentation from the watersheds.

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APA: Copy

AMIN, S.A., GAROUSI, A., & SHIRVANI, AMIN. (2002). PREDICTION OF SEDIMENT DELIVERY RATIO IN A SMALL AGRICULTURAL WATERSHED. IRAN AGRICULTURAL RESEARCH, 21(2), 157-172. SID. https://sid.ir/paper/16144/en

Vancouver: Copy

AMIN S.A., GAROUSI A., SHIRVANI AMIN. PREDICTION OF SEDIMENT DELIVERY RATIO IN A SMALL AGRICULTURAL WATERSHED. IRAN AGRICULTURAL RESEARCH[Internet]. 2002;21(2):157-172. Available from: https://sid.ir/paper/16144/en

IEEE: Copy

S.A. AMIN, A. GAROUSI, and AMIN SHIRVANI, “PREDICTION OF SEDIMENT DELIVERY RATIO IN A SMALL AGRICULTURAL WATERSHED,” IRAN AGRICULTURAL RESEARCH, vol. 21, no. 2, pp. 157–172, 2002, [Online]. Available: https://sid.ir/paper/16144/en

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