Transience of Riparian Freshwater Lenses

The transience of riparian lens movement is investigated for the first time, considering a fully penetrating, gaining river and rapid variations in hydraulic boundary conditions. Controlled laboratory experiments and numerical modeling are used to determine the timescales associated with lens movements. The insights into riparian lenses transience attained from the current study build on the understanding of transience obtained for other mixed-convective hydrogeological processes, such as seawater intrusion and retreat.