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Modelling study of wave damping over a sandy and a silty bed
Coastal Engineering ( IF 4.2 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.coastaleng.2020.103756
Linlong Tong , Jisheng Zhang , Jialin Zhao , Jinhai Zheng , Yakun Guo

Abstract Laboratory experiments have been carried out to investigate wave damping over the seabed, in which the excess pore pressure and free surface elevations are synchronously measured for examining the wave-induced soil dynamics and wave kinematics. Two types of soil, namely fine sand and silt, are tested to examine the role of soil in the wave damping. Observation of experiments shows that (i) soil liquefaction takes place for some tests with silty bed and soil particles suspend into the water layer when the bed is made of silt; (ii) sand ripples can be generated for experiments with sand bed. Measurements reveal that the wave damping greatly depends on the soil dynamic responses to wave loading and the wave damping mechanism over the silty seabed differs from that over the sand bed. On the one hand, the wave damping rate is greatly increased, when soil liquefaction occurs in the silty bed. On the other hand, the presence of sand ripples generated by oscillatory flow in the sand bed experiments also increases the wave damping to some extent. Furthermore, experimental results show that soil particle suspension in the silt bed test contributes to the wave damping. Theoretical analysis is presented to enhance discussions on the wave damping. The theoretical calculations demonstrate that the wave damping is mainly induced by the shear stress in the boundary layer for the cases when no liquefaction occurs. While for the cases when soil liquefaction takes place, the viscous flow in the liquefied layer contributes most towards to the wave damping.

中文翻译:

沙质和粉质层波浪阻尼模拟研究

摘要 为了研究海床上的波浪阻尼,进行了实验室实验,其中超孔隙压力和自由表面高程被同步测量,以检查波浪引起的土壤动力学和波浪运动学。测试了两种类型的土壤,即细沙和淤泥,以检查土壤在波浪阻尼中的作用。实验观察表明:(i)在一些试验中,粉质床发生土壤液化,当床由粉砂制成时,土壤颗粒悬浮在水层中;(ii) 沙床实验可以产生沙波纹。测量表明,波浪阻尼很大程度上取决于土壤对波浪载荷的动态响应,粉质海床上的波浪阻尼机制与沙床上的不同。一方面大大提高了波浪阻尼率,当粉土层发生土壤液化时。另一方面,沙床实验中振荡流产生的沙波纹的存在也在一定程度上增加了波浪阻尼。此外,实验结果表明,淤泥床试验中的土壤颗粒悬浮对波浪阻尼有贡献。提出了理论分析以加强对波浪阻尼的讨论。理论计算表明,在不发生液化的情况下,波浪阻尼主要由边界层中的剪应力引起。而对于发生土壤液化的情况,液化层中的粘性流动对波浪阻尼的贡献最大。沙床实验中振荡流产生的沙波纹的存在也在一定程度上增加了波浪阻尼。此外,实验结果表明,淤泥床试验中的土壤颗粒悬浮对波浪阻尼有贡献。提出了理论分析以加强对波浪阻尼的讨论。理论计算表明,在不发生液化的情况下,波浪阻尼主要由边界层中的剪应力引起。而对于发生土壤液化的情况,液化层中的粘性流动对波浪阻尼的贡献最大。沙床实验中振荡流产生的沙波纹的存在也在一定程度上增加了波浪阻尼。此外,实验结果表明,淤泥床试验中的土壤颗粒悬浮对波浪阻尼有贡献。提出了理论分析以加强对波浪阻尼的讨论。理论计算表明,在不发生液化的情况下,波浪阻尼主要由边界层中的剪应力引起。而对于发生土壤液化的情况,液化层中的粘性流动对波浪阻尼的贡献最大。提出了理论分析以加强对波浪阻尼的讨论。理论计算表明,在不发生液化的情况下,波浪阻尼主要由边界层中的剪应力引起。而对于发生土壤液化的情况,液化层中的粘性流动对波浪阻尼的贡献最大。提出了理论分析以加强对波浪阻尼的讨论。理论计算表明,在不发生液化的情况下,波浪阻尼主要由边界层中的剪应力引起。而对于发生土壤液化的情况,液化层中的粘性流动对波浪阻尼的贡献最大。
更新日期:2020-10-01
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