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Soil erosion and pollutant transport during rainfall-runoff processes

  • Water Quality and Protection: Environmental Aspects
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Abstract

The pollutant from land surface applied to agricultural chemicals is one of the major sources of contamination in water bodies. The pollutant transport within a watershed is profoundly influenced by the rainfall-runoff processes, especially the associated upland erosion and sediment transport processes because most of pollutant can be dissolved into water or attached to the soil particles. A set of soil experiments in laboratory was conducted in this paper to investigate the impacts of upland erosion and sediment transport on pollutant loads. The soil utilized for the experiments was the silty sand collected from Loess Plateau, China; and ammonium bicarbonate was applied on the soil surface as the pollutant source. Runoff discharge, soil loss, and ammonia- and nitrate-nitrogen concentrations were measured to establish the relationships which can help the numerical model to predict the pollutant losses coupled with upland soil erosion during the rain-fall-runoff processes. The experimental results indicate the ammonia-nitrogen concentration in runoff reaches the peak at the initial stage of the overland flow generation, and quickly decreases and approaches to the steady state. The ammonia-nitrogen transported by the soil loss also makes contributions to the nitrogen loss; and its amount mainly depends on the soil transport rate. The ammonia-nitrogen dissolved in overland flow is dominant due to the strong aqueous solution of ammonium bicarbonate during the first storm right after its application.

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Authors and Affiliations

  1. Ocean College, Zhejiang University, Hangzhou, 310058, P.R. China

    Zhiguo He, Haoxuan Weng & Hao-Che Ho

  2. Department of Hydraulic Engineering, Zhejiang University, Hangzhou, 310058, P.R. China

    Qihua Ran & Miaohua Mao

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  1. Zhiguo He
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  2. Haoxuan Weng
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Correspondence to Hao-Che Ho.

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He, Z., Weng, H., Ho, HC. et al. Soil erosion and pollutant transport during rainfall-runoff processes. Water Resour 41, 604–611 (2014). https://doi.org/10.1134/S0097807814050170

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