Seiche oscillations in a reservoir filled with a double-layer fluid

Abstract

Surface and internal seiches in a rectangular sloping reservoir filled with a double-layer fluid are theoretically and experimentally investigated. The one-dimensional calculations are performed within the framework of the linear shallow-water theory, under the assumption of a long and narrow basin. An analytical solution of the problem is derived for a basin with constant cross-sectional areas in either layer and constant cross-section widths at the free surface and layer-layer interface levels. The one-dimensional model is shown to well describe the oscillation eigenfrequencies and the position of the nodes of the surface and internal seiches.