Characterization of Scale-Dependent Dispersivity in Fractured Formations Through a Divergent Flow Tracer Test

Scale‐dependency of dispersivity has been reported from field tracer tests. We present a simple methodology for characterization of dispersivity as a linear function of scale around an injection well using divergent flow tracer test data conducted in fractured formations. Results show that the slope of this linear dispersivity function can be estimated using tracer concentration measurements in a monitoring well. The characterized dispersivity function has applications in modeling of field‐scale transport processes in fractured formations.