Hydrologic Effects Caused by the Heterogeneity of Karstic Conduit-Fissure Medium
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Abstract:
The heterogeneity is one essential property of karstic medium, resulting in the complicated hydrologic cycle and shallow geologic evolution. Moreover, the heterogeneity of medium also leads to the high difficulty for the evaluation of groundwater flow system and solute transportation. The SWMM developed by EPA (U.S. Environmental Protection Agency) was used in this study to simulate the hydrologic process conducted at the laboratory. The hydrologic effects of the heterogeneity were discussed through the calibrated SWMM model. The results indicate that SWMM model is appropriate to model the karstic hydrologic process for the conduit-fissure medium. The conduit size, the medium void and the exchange coefficient of groundwater and surface interaction has slight effect on the water level and discharge of the outlet of drainage area. However, the conduit size controls the highest groundwater level, the magnitude of medium void can change the process of groundwater increasing and decreasing, and the exchange coefficient has significant effects on the change speed of groundwater level and the highest groundwater level.
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