Experimental Simulation Study on Unsaturated Soil Water Movement in the Hyporheic Zone of Tidal Rivers
The hyporheic zone,serving as a transitional zone between river systems and groundwater sys-tem of the bank,maintains the ecological health of rivers through continuous material transport and energy conversion between the two systems.In order to investigate the characteristics and patterns of water move-ment in the hyporheic zone of tidal rivers,a set of experimental apparatus are designed with the riparian hyporheic zone of tidal rivers taken as a original model.The effects of water level fluctuation range and sediment permeability on water movement in the riparian hyporheic zone of tidal rivers are analyzed,through monitoring the changes in moisture content and matrix potential of different soils under different condions of water level fluctuation ranges.The experimental results indicate that the response relationship between the variation in moisture content of unsaturated soil in the hyporheic zone of tidal rivers and the river water level fluctuation exhibits nonlinear characteristics.Moreover,the water movement shows sig-nificant vertical and horizontal differences,and also the water movement of the unsaturated soil is signifi-cantly influenced by the range of tidal-driven river water level fluctuations,sediment types and the hyster-esis characteristics of soil-water properties.
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