Modeling the Effect of Hyporheic Flow on Solute Residence Time Distributions in Surface Water

Understanding the dynamics of hyporheic flow is important for managing water resources, since this interfacial exchange affects fate and transport contaminants in rivers. This study numerically quantifies effect on solute residence times surface systems by simulating unified turbulent open-channel zone systems. Interfacial fluxes (qint) increase with increased Reynolds number (Re) that produces an enhanced bottom pressure gradient over ripple bed. Heavy-tailed breakthrough curves emerge when considered simulation. reveals a dominant driver non-Fickian as delays slow porewater flows. Furthermore, Re extends longitudinal spreading tracers because higher velocity intensifies magnitude associated storage effects. can be confirmed ratio maximum time to peak arrival increases Re, following power-law relationship both qint.