一种掩护海上过驳的柔性浮堤透浪特性试验研究

Experimental Study on Wave Penetration Characteristics of a Flexible Floating Dike for Sea Barge Cover

针对海上过驳作业条件掩护需求提出的一种新型柔性浮堤设计方案,在波浪水槽中开展断面物理模型试验。该浮堤在4级海况(波高2.5 m)下的波浪透射系数为0.6~0.97,研究得到透射系数随作业水深、入射波浪周期、浮囊层数(入水深度)、水深-波长比(h/L)、相对吃水(d/h)及相对水深(d/L)的变化规律。通过透射系数与水深、波长和入水深度等因素的关系,拟合得到该型浮堤透射系数的经验公式。通过增加首层浮囊数量、扩大宽度,浮堤调整方案的透射性能得到改善,最小透射系数接近0.5,表明浮堤的消波性能与它沿波浪传播方向的尺度有关。

A new flexible floating dike was proposed to meet the requirement of covering the conditions of offshare barge operation.The model test of cross-section was carried out in the wave flume to analyze wave covering effect of the floating dike.The wave transmission coefficient of the floating dike is 0.6~0.97 in Class 4 sea condition.The variation of transmission coefficient with operating water depth,incident wave period,number of floating tank layers,water depth-wavelength ratio,relative draft and relative water depth was given.An empirical formula of transmission coefficient for this type floating dike was obtained by analyzing the relationship between the transmission coefficient and water depth,wavelength,water depth and other factors.The transmission of the floating dike was improved by increasing the number of floating bags,and the minimum transmission coefficient was close to 0.5.The wave attenuation of the floating dike is related to the scale in the wave propagation direction.