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本文开展了上粗下细和上细下粗的层状沙滩对波浪响应的试验,并与相应的粗沙、细沙全级配沙滩相应结果进行比较。试验结果给出了层状沙滩与单一粒径和全级配沙滩对波浪动力的响应明显不同。层状沙滩和纯粒径沙滩剖面变化不同,层状沙滩沙坝位置更离岸高度更高而宽度较窄,滩肩位置更为离岸,滩肩高度较低。沙床沉积物在波浪作用下产生了明显的分选现象,层状沙床比全级配沙床级配差。小波作用下,沙床表层泥沙粒径占比变化比大波作用下更明显;上细下粗沙床比上粗下细沙床对表层泥沙粒径占比变化影响大。沙滩粒度分布受波浪强度影响,大波作用下沙滩不均匀层深度更深,柱状样的平均粒径和粒度参数变化大。
Abstract：The distribution of particle size on natural or artificial beaches is irregular and some beaches have layered features.In this paper,sandy beaches with different particle sizes were used to lay beaches and wave experiments were conducted under wave dynamics to investigate the relationship between beach shape and sediment movement characteristics and wave dynamics,sediment particle size,and layered bed surfaces.The experimental results show that:under the same wave action,the profile of stratified sedimentation beach and pure particle size beach have different changes.The location of the stratified beach sandbar is higher on the sea and the width is narrower,and the beach shoulder position is even lower to the beach shoulder.Beach bed sediments produced clear sorting under the action of waves.Stratified sand beds were poorer than the full-scale sand bed and the sorting degree was better.Under the action of weak waves,the change tendency of the surface ratio of the sand bed is larger than that of the strong wave;the change of the ratio of the coarse sand bed to the coarse sand bed is more severe than that of the upper coarse sand bed.The particle size distribution of the beach is affected by the wave intensity.The stronger the wave intensity is,the deeper the inhomogeneous layer is,and the larger the average particle size and particle size parameters of the columnar sample are.
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基本信息:
DOI：10.16441/j.cnki.hdxb.20180135
中图分类号:P737.1
引用信息:
[1]岳帅,郑建国,杨亚迪,等.波浪对层状沙滩的塑形及粒径分配试验研究[J].中国海洋大学学报(自然科学版),2018,48(S2):98-106.DOI:10.16441/j.cnki.hdxb.20180135.
基金信息:
国家自然科学基金项目(41576039)资助~~
2018-12-10
2018-12-10