Research Progress on Effects of Variations of Underlying Surface on Runoff Yield and Concentration in the River Basin
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Abstract:
With the increasing impacts of human activities, the underlying surface of the river basin has encountered significant variations in recent years, which has changed the characteristics of hydrological processes such as infiltration, evapotranspiration, and runoff, and also caused significant impacts on the water resources, flood, and drought in the river basin. In order to develop the water resources reasonably, the impacts of the variations of underlying surface on the runoff yield and concentration have become a hot topic in the hydrological research. In recent years, the research process of the effects of the variations of underlying surface on the hydrological cycle can be classified into three phases: budding stage, starting stage, and development stage. The current research suggests that deforestation, grassland reclamation, agricultural development, and urbanization can increase runoff, whereas soil and water conservation can reduce runoff, and the coupling effects of landscape change and underlying surface change can impact the runoff. The research methods of the hydrological effects caused by the variations of underlying surface include the comparative test, time-series method of characteristic values, and hydrological models, and the eco-hydrological model is the frontier and hot issue of eco-hydrological research. Moreover, several comprehensive methods have been applied to investigate the hydrological effects caused by the variations of underlying surface, and the research method of “prototype observation plus numerical simulation” is the development trend.
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