How daily groundwater table drawdown affects the diel rhythm of hyporheic exchange

Abstract. Groundwater table dynamics extensively modify the volume of hyporheic zone and rate exchange processes. Understanding effects daily groundwater fluctuations on tightly coupled flow heat transport within zones is crucial for water resources management. With this aim in mind, a physically based model used to explore responses varying fluctuation scenarios. The different timing amplitude drawdowns under gaining losing conditions are explored influenced by natural flood events diel river temperature fluctuations. We find that both play important roles determining spatiotemporal variability rates, exfiltrating fluxes, mean residence times, denitrification potentials. present substantially distinct impacts or conditions. drawdown has direct influence rates buffering capacity thermal disturbances. Consequently, selection aquifer pumping regimes significant dispersal pollutants heterogeneity sediment.