Impacts of Urbanization and Dams on River Runoff in the Shaying River Basin
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Abstract:
The distributed hydrological model, Precipitation Runoff Modeling System (PRMS), takes into account of precipitation, climate, and land use, and can be used to simulate the important variables representing the water and mass cycle in a basin such as water and sediment. In this paper, the PRMS model was calibrated and validated with the observed runoff data, and then the validated model was used to simulate the impacts of urbanization and dams on runoff in the Shaying River basin. The results showed that the evaporation and infiltration decrease whereas runoff increases in the basin due to the expansion of impermeable land surface as a result of urbanization. The presence of dams can change the spatial and temporal distribution of water resources in the basin, dampen the variation of natural runoff, increase the water surface evaporation, decrease the peak runoff, and then delay the time of peak flow. The impacts of urbanization and dams on runoff were more obvious in the dry years.
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