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22 nd Salt Water Intrusion Meeting: Salt Water Intrusion in Aquifers: Challenges and PerspectivesMIXING BETWEEN FRESH AND SALT WATERS AT AQUIFER REGIONALSCALE AND IDENTIFICATION OF TRANSVERSE DISPERSIVITYDAGAN, Gedeon 1 ; PASTER, Amir 21. School of Mechanical Engineering, Faculty of Engineering, Tel Aviv University,Ramat Aviv, 69978 Tel Aviv, Israel2. Dept. of Civil Engineering and Geological Sciences, University of Notre Dame, NotreDame, IN, USAAbstract: In aquifers in which freshwater flows above saltwater, a mixing layer developsbetween the two water bodies. An approximate model of the mixing layer in steady state 3Dflow, based on the boundary layer approach, was developed in the past. The approach isdemonstrated for Yarkon–Taninim basin (Israel), a Karstic confined aquifer extending over6000 km 2 in which fresh water flushes a salt water body at the bottom of the aquifer. Usinghydrogeological data and salinity data of the discharged water in the Taninim springs, theregional scale transverse dispersivity was identified by an inverse procedure. It involvedsolving numerically the fresh water flow above the interface, computation of the transitionzone and of the salinity of the discharged water and calibration of the transverse dispersivitya T . The determined value was a T =0.04 m. This is an important finding, as it is the first timethe parameter is evaluated for an aquifer at regional scale.Ref: Journal of Hydrology 380 (2010), 36–44240