不同坡度砂质海床波浪冲刷试验研究

The Erosion Experimental Study of Sand Seabed with Different Slopes

通过自制水槽模型箱试验,考察不同坡度条件下的砂质海床在相同波浪作用下的冲刷情况,对比分析了波浪作用前后海床表层土体颗粒级配、渗透系数及床面贯入值的变化。试验结果表明,波浪作用会使海床土体发生粗化现象;随着颗粒的粗化,泥沙起动的开始时间推迟;波浪作用导致的泥沙起动破坏了土体原有结构,使海床表层土体渗透系数变大,床面贯入值出现减小趋势。

Model test by self-made water flume was investigated under sandy seabed erosion of different slopes with the same wave conditions. The change of grain size, permeability coefficient and penetration value of the seabed surface soil were compared and analyzed before and after the wave action. The results showed that the seabed will coarsening, lead to delaying the sediment incipient motion; Sediment movement caused by wave action destroyed the original structure of the soil, so that the permeability of seabed surface layer becomes larger, and the value of penetration of the bed appeared decreasing trend.