Author(s): Tae Sung Cheong; Bassam A. Younis; Il Won Seo
Linked Author(s): Il Won Seo
Keywords: Mixing characteristics; Transient storage model; Parameter estimating; Analytic solution
Abstract: The hyporheic exchange mechanisms associated with the hyporheic zone of a natural heterogeneous environment are often modified by the unsteady behavior of the free-flowing water zone. This can play a very important role in the mass exchange between the free flowing water zone and hyporheic zones which are cause of secondary hump and plateau region of the tail of observed breakthrough curve in natural streams. In this work, an analytical solution is used to predict the shape of solute breakthrough curves in a natural stream based on various representations of transient storage exchange, including new parameter formulations. New formulations for estimating key parameters of the hyporheic zone model using hydraulic and geometric data sets that are easily obtained in the natural streams are developed. The new model including new parameter formulations provides an accurate representation of the breakthrough curves of chloride along a 1. 2km reach of the Shingobee River, Minnesota, U. S. A.