涌潮作用下护滩块石起动研究

Incipient motion of rock blocks for beach protection under the action of tidal bores

采用理论分析与试验研究相结合的方法,首先从理论上分析涌潮运动要素之间的关系,然后根据起动临界状态时的力学平衡条件,推导出涌潮作用下护滩块石稳定计算的结构公式。在公式中采用涌潮相对(滩地水深)高度表示其对护滩块石的动力作用,同时考虑了滩地水深对护滩块石稳定性的影响。在涌潮水槽试验中,进行了护滩块石在涌潮作用下的起动试验研究,验证了文中提出的块石稳定粒径计算公式的正确性,并根据试验结果率定了公式中的待定系数。

Based on the analysis on the relationship between characteristics and mechanism of bores, a new formula was deduced for computing incipient motion of rock blocks for beach protection. In the formula, the dynamical action on blocks by tidal bore was expressed by the relative height of tidal bore, and the impact of base water depth on the stability of blocks was taken into account. An experiment was conducted in a flume to study the stability of blocks under the action of tide bore. The validity of the new formula for computing the stability of blocks was proved, and the parameter in the formula was determined by using experimental results.