波浪作用下沙纹床面形态及底摩阻系数研究

发布时间：2018-04-12 19:40

本文选题：沙纹 + 波浪　；参考：《水运工程》2017年05期

【摘要】：波浪作用形成的沙纹在近海区域普遍存在,准确预测沙纹床面形态并计算对应的底摩阻系数是研究近岸波浪变形、泥沙输运及岸滩演变的基础。利用国外公开发表的室内试验和现场观测数据对已有计算沙纹形态的典型公式进行分析评价。考虑床面形态与水流条件的互相适应,提出新的平衡状态下沙纹长度、高度及波陡计算公式;引入临界Shields参数判别函数来考虑底床泥沙运动状态对沙纹形态的影响;通过理论推导得到波浪摩阻系数计算公式,并利用沙纹形态计算公式改进粗糙高度的计算方法。结果表明,提出的沙纹形态计算公式能够较好地刻画不同底沙运动状态下沙纹床面几何特征,临界Shields参数对于沙纹形态的计算具有重要影响;新得到的沙纹长度和高度公式可以有效地应用于波浪摩阻系数计算。
[Abstract]:The sand stripes formed by wave action are common in the offshore area. It is the basis of studying the wave deformation, sediment transport and shoreline evolution to accurately predict the sand grain bed shape and calculate the corresponding bottom friction coefficient.The typical formulas for calculating sand grain morphology have been analyzed and evaluated by using the laboratory test and field observation data published abroad.Considering the mutual adaptation of bed shape and flow condition, a new formula for calculating the length, height and wave steepness of sand grain under equilibrium state is proposed, and the critical Shields parameter discriminant function is introduced to consider the influence of sediment movement state on sand grain shape.The calculation formula of wave friction coefficient is obtained by theoretical derivation, and the calculation method of rough height is improved by using the calculation formula of sand grain shape.The results show that the proposed formula can well describe the geometric characteristics of sand grain bed surface under different bottom sand movement, and the critical Shields parameters have important influence on the calculation of sand grain shape.The new formula of sand grain length and height can be effectively applied to the calculation of wave friction coefficient.
【作者单位】：河海大学海岸灾害及防护教育部重点实验室;河海大学港口海岸与近海工程学院;
【基金】：江苏省普通高校研究生科研创新计划项目(KYZZ15_0143)
【分类号】：P737.1;TV148

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