| Water exchange can block up or down the transport and transfer of pollutants, so the water exchange dominates the transport and transfer of pollutants in Hyporheic Zone. Therefore, it is necessary to study the effect of water exchange transport and transfer of pollutants, not only deepen the undercurrent with hydrological processes and contaminant transport, but also conducive to manage the rivers and groundwater quantity and quality,it has important guiding significance for study the surface water and groundwater pollution, restore the hydrological function and maintain the river health. Weihe River heavily polluted river water, river water and groundwater hydraulic its close ties with each other significantly affect water quality. As a case study of the Weihe River, Select different river sites (including Caotan, Meixian, Huaxian and Lintong) between winter and summer seasons, the undercurrent of different depth with temperature is measured by a temperature sensor, and the undercurrent with the water exchange is calculated convective diffusion equation obtained by thermal, Through gap the determination of TP, TN calculation of pore water and sediment TP, TN flux in Hyporheic Zone. Results of the study show that4is experimental river are two different studies in winter and summer, temperatures will vary with changes in sediment depth undercurrent produce significant changes, in the winter the ground water recharge the surface water mainly, and The ground water was mainly recharged by surface water in the summer tests in every test sites, The maximum value of the frequency distribution of winter between2.0～10.0mm/d; summer between20.0～25.0mm/d. In four studies, the migration and transformation fluxes of TN, TP are different from pore water and sediment, the maximum amount of TN are Meixian、Huaxian and Meixian Caotan,the minimum are Huaxian and Lingtong、Meixian, the maximum amount of TP are Lingtong、Caotan and Lingtong、Caotan,the minimum are Meixian and Caotan、Meixian. The flux of migration of TN、TP exist Temporal and Spatial differences、the coefficient of TN is between0.13-0.06in summer belong to weak variability, while0.12～0.40in winter belong to moderate variability, the coefficient of TP is between0.02-0.04in summer, while0.02～0.08in winter belong to weak variability in pore water, the coefficient of TN is between0.04-0.13in summer, while0.02-0.08in winter belong to belong to weak variability, the coefficient of TP is between0.09-0.03in summer belong to moderate variability, while0.02-0.08in winter belong to weak variability in sediment. the content of TN、TP exist Vertical distribution, the curve can be roughly divided into four categories. The coefficient of TN、TP is different at different times and sites in pore water and sediment, and the coefficients are greater than0 between pore water and sediment. the coefficient of TN、TP in summer are bigger than in winter in pore water, while TN is bigger than in winter, TP is bigger than in summer in sediment.The content of TN, TP in pore water and sediment are positive correlation, thet gap in the pore water and sediments of TN, TP will migrate each other, but their relevance is not high. |
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