Experimental Study of Monochromatic Wave-Ebb Current Interaction. Volume 1. Main Text and Appendix A

This report describes an experimental study of the interaction of monochromatic waves and an ebb current in and near a shallow entrance channel. Laboratory experiments were performed in a three-dimensional basin with a 1 vertical (IV) on 30 horizontal (30H) fixed-bed slope. Two entrance channel configurations were tested: one with a IV on IH side slope and the other with vertical sides. Both had equal cross-sectional areas and were 1-m wide, 10-cm deep, and 5.5-m long. Four small amplitude waves were generated using the directional spectral wave generator (DSWG). These waves had wave periods of 0.75 and 1.50 sec, directions of 0 deg and 20 deg (relative to normal to the DSWG), and wave heights of 5.0 cm. Steady ebb currents of 10, 20, and 30 cm/sec were generated using a 0.16-M3 pump. Measurements were made with capacitance wave gages and triaxial ultrasonic current meters in a 5-m by 6-m area. The six cross-shore transects had seven gages with a 1-m spacing between gages... Ebb current, Wave-current interaction, Three-dimensional physical models. Prepared in collaboration with Cornell Univ., Ithaca, NY 14853. Dept of Civil and Environmental Engineering.