波浪与水流共同作用下的底砂起动

研究波浪与水流共同作用下底砂的起动,对于研究和解决河口海岸地区的冲淤变化、沿海航道的变迁、堤岸工程和闸下淤积的疏(氵尤夂)等问题,以及从理论上和实践中分析泥沙回淤及输沙量都具有重要的现实意义。 本文通过理论推导和实验观测,对波浪、水流共同作用下的底砂起动进行了研究探讨。

THE INITIATION OF BED SEDIMENT MOTION UNDER THE JOINT ACTIONS OF WAVE AND CURRENT

This article presents the result of an investigation on the initiation of bed sediment motion under the joint actions of wave and current through both theoretical derivation and experimental observations, as a result of this investigation, a formula for initiating noncoh-esive sediment motion under the above conditions is proposed. Two empirical coefficients-the momentum propagation coefficient of current C_f, andthe momentum propagation coefficient of wave and current C_w are obtained from experimental data which have been processed by a two dimensional least-square algorithm program through computer analysis. The results compare favorably with Shields Surves.