Abstract: Provided is a sand setting circulating device for wave-current tank test tailings. A sand collection device is arranged at a front end of a tail gate of a tank body for performing primary collection on a bed-load sand body with a large particle size; a sand-water separating device is arranged at a tail end of the tank body for performing sand-water separation on tail water subjected to energy dissipation so as to perform secondary collection on a suspended load sand body with a small particle size, the sand-water separating device comprising a collection barrel and a sand suction device mounted in the collection barrel; a water outlet is formed in an upper part of the collection barrel, and separated clear water flows into a clear water reservoir through a water return pipe for cyclic utilization; and a computer is arranged for intelligent control.

Abstract: Provided is a tank wave-current generation system with a rear-mounted outlet. The rear-mounted outlet and a rectifying device located below a tank are arranged, the rectifying device comprises a rectifying chamber and a built-in rectifying grid, one end of the rectifying chamber is communicated with a water collection tank, and the other end of the rectifying chamber is communicated with a bottom wall of a tank unit, an outlet in the bottom wall is located at a front end of a wave pushing direction of a wave generator, a current subjected to preliminary energy dissipation in the water collection tank is rectified into a smooth fluid through the rectifying grid and then a steady current is input into the tank, so that the current pushed by a wave pushing plate arranged on the wave generator is a steady current meeting a test requirement.