沙波形态对波浪要素的响应  

Response analysis of sand ripple form to wave elements

作　　者：王盈心 李瑞杰[1,2] 李玉婷 WANG Yingxin;LI Ruijie;LI Yuting(Key Laboratory of Coastal Disaster and Defence,Ministry of Education,Hohai University,Nanjing 210098,China;Laboratory of Ocean Environment,Hohai University,Nanjing 210098,China;Key Laboratory of Virtual Geographic Environment of Ministry of Education,Nanjing Normal University,Nanjing 210023,China)

机构地区：[1]河海大学海岸灾害及防护教育部重点实验室,南京210098 [2]河海大学环境海洋实验室,南京210098 [3]南京师范大学虚拟地理环境教育部重点实验室,南京210023

出　　处：《南水北调与水利科技（中英文）》2021年第3期606-613,624,共9页South-to-North Water Transfers and Water Science & Technology

基　　金：国家自然科学基金青年基金(51709091);中央级公益性科研院所基本科研业务费专项(HKY-JBYW-2020-03);江苏省自然科学基金青年基金(BK20170874)。

摘　　要：针对波浪作用下沙质底床上普遍存在的沙波现象,从沙波尺度角度出发,采用1957-2018年共385组野外实测资料和水槽试验资料进行拟合分析,得到基于近底波浪水质点运动强度的沙波波高、沙波波长计算公式。结果表明:与Ni81规则波、Ni81不规则波、VR89和GK04等4种典型模型对比,新的沙波波高和沙波波长计算公式具有更高的计算精度且表达形式上更具一般性;利用该沙波形态计算公式可改进床面粗糙度的计算方法,当应用于波浪底摩阻系数的求解时计算结果与实测数据较为吻合,即沙波形态对底边界层有效粗糙度的影响显著;新的沙波波高和沙波波长计算公式可较好地应用于波浪底摩阻系数的计算。Sand ripple movement widely exists in the impinged river and coastal zone,and the ripple shape leads to the obvious change of bed surface roughness,which has a significant influence on the total resistance of the bottom bed.For ripple height and ripple length calculation methods,many scholars did comprehensive research,but due to the diversity of each factor affect the ripple scale and the complexity of interconnected,the different research methods,and the differences between the source and water features,lead to the existing formula of ripple shape structure that is diversiform,and the calculation formula lack universality due to an error in the formula under different hydraulic conditions.The general expression for calculating ripple height and ripple length was established based on adapting wave conditions to ripple shape.A total of 385 groups of field measured data and flume experimental data were used for fitting analysis from 1957 to 2018,and the calculation formula for ripple height and ripple length based on the mobility number of near-bottom wave water quality point was obtained.Compared with the existing ripple calculation models,the influence rules of the mobility number on the ripple shape and the advantages and disadvantages of each model were analyzed and demonstrated.Two statistical error parameters RMSE and MAE were used to evaluate the degree of concordance between the predicted ripple height and ripple length of each prediction model and the actual value,and the accuracy of the formula was measured according to the calculation error.At the same time,the calculation formulas of ripple height and ripple length were applied to calculate the bottom rough height of the bed.The variation characteristics of ripple surface roughness under wave action and the rationality of the ripple formula were discussed by comparing with the existing models,and the parameters in the formula were calibrated using measured data.The formula of ripple shape and bottom roughness were introduced into the calculation of the

关 键 词：沙波运动 波浪 水流强度参数 有效粗糙度 波浪底摩阻 

分 类 号：TV139.2[水利工程—水力学及河流动力学]