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Experimental and analytical studies of solute transport during run‐off over vegetated surfaces
- Zhang, Taotao, Xiao, Yang, Liang, Dongfang, Wang, Lei
- Hydrological processes 2018 v.32 no.15 pp. 2335-2345
- laboratory experimentation, mixing, models, overland flow, pollutants, prediction, rain intensity, runoff, soil, solutes, vegetation, water pollution
- Solute transport in overland flow is considered as one of the main contributors to water pollution. Although many models of pollutant transport mechanism from soil to run‐off water have been proposed, the characteristics of solute transport accompanying the water run‐off over vegetated surface have not been well studied. In this study, a series of laboratory experiments were conducted to study the solute transport over vegetated surfaces. Based on the experimental results, an idea of the “stationary water layer” in run‐off was proposed. Applying the complete mixing theory in the stationary water layer, an analytical solute transport model was developed with the assumption that the upper run‐off completely mixes with the underlying water in the stationary water layer for each site. The results show that the predictions made by the present model are in good agreement with the measured experimental data. For the vegetated surfaces, the depth of stationary water layer is related to the rainfall intensity, bed slope, and vegetation density. The analytical solution shows that the maximum solute transport occurs at the time of concentration. This study advances our understanding of the mechanisms of solute transport over vegetated areas.