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The temporal evolution of a water-sand interface driven by gravity isexperimentally investigated. By means of a Fourier analysis of the evolvinginterface the growth rates are determined for the different modes appearing inthe developing front. To model the observed behavior we apply the idea of theRayleigh-Taylor instability for two stratified fluids. Carrying out a linearstability analysis we calculate the growth rates from the correspondingdispersion relations for finite and infinite cell sizes. Based on thetheoretical results the viscosity of the suspension is estimated to beapproximately 100 times higher than that of pure water, in agreement with otherexperimental findings.Comment: 11 pages, 12 figures, RevTeX; final versio

Fingering instability in a water-sand mixture