An overview of the effects of hyporheic processes on the streambed hydraulic conductivity in the hyporheic zone of a river
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Abstract:
The hyporheic zone plays a key role in the surface water and groundwater interaction. Streambed hydraulic conductivity can affect the magnitude of interactions between groundwater and surface water and hyporheic water exchange. The clogging and declogging processes often occur alternately, which can change the streambed sediment characteristics and affect its permeability. On the basis of the overview of literatures of hyporheic exchange and streambed hydraulic conductivity, the possible effects of clogging and declogging processes on the streambed hydraulic conductivity have been illustrated. Streambed hydraulic conductivity is not only affected by the pore size of sediments, but also related to the hydrological connectivity and bioturbation in the hyporheic zone. Generally, the small particles brought by the floods can cause riverbed clogging, resulting in reduced hydraulic conductivity. However, when the flood goes down, hydrological exchange and bioturbation in the hyporheic zone can destroy the clogging layer, causing the declogging process and increasing in hydraulic conductivity. The current studies are limited to the analysis of the variations of measured streambed hydraulic conductivity data, and the mechanism of the clogging and declogging processes in the hyporheic zone of a river requires more investigations.
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