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Sediment concentration and hydraulic characteristics of rain-induced overland flows in arid land soils

  • Sediments, Sec3 • Hillslope and River Basin Sediment Dynamics • Research Article
  • Published:
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Abstract

Purpose

Rain-induced overland flow involves the detachment of soil particles by raindrop impact and the transportation by the resultant overland flow. The purpose of this study was to investigate the relationship between sediment concentration and different hydraulic parameters including flow depth, flow velocity, shear stress, stream power, and unit stream power. The effects of soil particle size distribution, rain intensity, and slope steepness on measured sediment concentration in rain-induced sheet flow were also examined.

Materials and methods

Two arid land soils with different particles size distributions (D2mm and D4.75mm) were subjected to simulated rains using a detachment tray under infiltration conditions. Two rain intensities of 57 and 80 mm h−1 were simulated on slope gradients ranging from 0.5 to 20 %, resulting in rain-induced overland flows. After pre-wetting each soil, the sediment-laden overland flow was sampled at several time intervals (2, 5, 15, 20, 30, and 40 min) and the sediment concentration was determined. Different hydraulic parameters including flow depth, flow velocity, shear stress, stream power, and unit stream power were measured. The hydraulic parameters were used to model the sediment concentration, and the model performance was evaluated.

Results and discussion

The result showed that the measured sediment concentration was greater in the higher rainfall intensity and at steeper slopes. With increasing slope steepness, sediment concentration increased from 4.3 to 15.5 kg m−3 and from 3.8 to 12.5 kg m−3 for soils D2mm and D4.75mm, respectively. There was a direct relationship between sediment concentration and the rain-induced flow velocity, shear stress, stream power, and unit stream power. Nevertheless, the values of sediment concentration increased as flow depth decreased on steeper slopes. Also, sediment concentration was lower in the soil containing larger aggregates than in the finer soil. The hydraulic parameters tended to overestimate low amounts of sediment concentration and underestimate high values.

Conclusions

In general, the accuracy of the hydraulic parameters in predicting sediment concentration was: flow velocity > stream power > shear stress > unit stream power > flow depth. Flow velocity was the best predictor of sediment concentration with a linear relationship, whereas the other parameters showed nonlinear relationships. This study revealed that rain-induced sediment concentration at small scales can be modeled precisely on the basis of the flow velocity parameter.

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Authors and Affiliations

  1. Department of Soil Sciences, Agriculture Faculty, Shahid Bahonar University of Kerman, Kerman, Iran

    Sara Arjmand Sajjadi & Majid Mahmoodabadi

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  1. Sara Arjmand Sajjadi
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  2. Majid Mahmoodabadi
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Correspondence to Majid Mahmoodabadi.

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Responsible editor: Nikolaus Kuhn

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Arjmand Sajjadi, S., Mahmoodabadi, M. Sediment concentration and hydraulic characteristics of rain-induced overland flows in arid land soils. J Soils Sediments 15, 710–721 (2015). https://doi.org/10.1007/s11368-015-1072-z

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  • DOI: https://doi.org/10.1007/s11368-015-1072-z

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