Solute Transfer from the Soil Surface to Overland Flow: A Review
- Xiaonan Shia,
- Laosheng Wu *bc,
- Weiping Chencd and
- Quanjiu Wange
- a Key Lab. of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing, China 100085
b College of Environment and Resource Sciences Zhejiang Univ. Hangzhou, China 310058
c Dep. of Environmental Science Univ. of California Riverside, CA 92521
d State Key Lab. of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing, China 100085
e State Key Lab. of Soil Erosion and Dryland Farming on Loess Plateau Institute of Soil and Water Conservation Chinese Academy of Sciences Yangling, China 712100
Transfer of agrochemicals from the soil surface to overland flow is a key process governing pollutant transport from soil to surface waters. Simulation models are effective tools for predicting pollutant loads from overland flow to surface water. In this study, we reviewed and summarized experimental observations to assess the factors that affect this transfer process, including: rainfall, topography, soil hydraulic properties, initial water and solute conditions, and management practices. Theoretical frameworks and models for describing the transfer process were also reviewed. The existing models were classified into four categories based on their principles: mixing-layer models, interfacial diffusion-controlled models, interfacial-diffusion and rainfall-dispersion models, and empirical models. The assumptions, parameters, applications, limitations or potential issues, and further improvements for each category of the models were discussed. It is recommended that new experimental methods be developed and current theoretical frameworks be further refined by considering the effects of other environmental factors and transport mechanisms on solute transfer from the soil surface to overland flow so that the models can be applied to a wider range of practical field conditions.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © 2011. . Copyright © by the Soil Science Society of America, Inc.