直立堤前海床的局部冲刷
Scour in front of vertical breakwater by irregular waves
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摘要: 对不规则波作用下直立堤前海床的局部冲刷进行了研究。研究了由于波浪作用导致床面的底沙运动,从而造成提前海床的局部冲刷,即所谓的“相对粒沙”的情况。报导了;(1)堤前海床面为水平、堤下无基床情况下的堤前局部冲刷,以及堤下有明基床时基床尺度对堤前局部冲刷的影响;(2)堤前海床面为斜坡面时堤前的局部冲刷,以及当堤下有明基床时基床尺度对堤前局部冲刷的影响;(3)从波浪作用下床面边界层的理论分析出发,对于在不规则波作用下,离堤面愈远处的冲刷坑深度愈小的事实给出了解释。Abstract: The scour in front of vertical breakwater under the action of irregular waves was studied by the method of combined theoretical and experimental work. Basic conclusions of this study can be given as follows; (I)The maximum depth of scouring trough can be detemined by Eq.(6),when the bottom surface is horizontal and the foundation of breakwater is under the cover of the bottom surface. (2) In case hc/h<0.4, the effect of hc on the scouring patterns is not obvious. (3) The effect of the slope of the bottom surface on the scouring patterns is obvious. (4) As for the depths of scouring troughs, the more far from the breakwater, the more small.
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Key words:
- Irregular waves /
- scouring trough /
- boundary layer theory /
- mass transport velocity
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Xie Shileng. Scouring patterns in front of vertical breakwaters and their influence on the stability of the foundation of the breakwaters. Report Coastal Eng. Group Delft, The Netherlands, 1981 薛晓春,赵子丹.波浪作用下直立堤前床面边界层内传质速度.海洋学报,1997. 19(1):113-122 高学平.波浪与海上建筑物及海床的相互作用[博士论文].天津大学,1992 醉晓春.规则波、不规则波与直立式建筑物及沙质底床的相互作用[博士论文].天津大学,1995 -
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