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EPA On-line Tools for Site Assessment Calculation

Longitudinal Dispersivity
Estimated Longitudinal Dispersivity
Gelhar tabulation of longitudinal dispersion data.

Tabulated data of longitudinal dispersivity versus scale (i.e., plume length) plotted with estimation formulas: "1/10" plume length (straight line) and the Xu and Eckstein formula (curve). Approximate upper and lower limits of data given below with results.

Xu and Eckstein (1995) formula
ax= 0.83[ log10(Lp) ]2.414
ax = longitudinal dispersivity estimate
Lp = Plume Length (Lpis in meters)
Site Name

Input Parameters
Plume Length Lp

Dispersivity Results
(one-tenth plume length)
Estimates from the Gelhar Data Tabulation:
Approx. Lower Limit (Xu and Eckstein formula) Approx. Upper Limit

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