基于改进XBeach的波浪作用下岸滩冲淤演变特性的数值研究  

Numerical Study of Beach Profile Evolution under Waves Based on Improved XBeach

作　　者：于航 张建鹏 陈根发[2] 陈鑫[1,3] Yu Hang;Zhang Jianpeng;Chen Genfa;Chen Xin(College of Water Resources and Civil Engineering,China Agricultural University,Beijing 100083,China;Department of Water Resources Research,China Institute of Water Resources and Hydropower Research,Beijing 100044,China;Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System,China Agricultural University,Beijing 100083,China)

机构地区：[1]中国农业大学水利与土木工程学院,北京100083 [2]中国水利水电科学研究院水资源研究所,北京100044 [3]中国农业大学、北京市供水管网系统安全与节能工程技术研究中心,北京100083

出　　处：《水动力学研究与进展（A辑）》2023年第3期495-503,共9页Chinese Journal of Hydrodynamics

摘　　要：岸滩演变是海岸泥沙运动学研究的热点问题之一。波浪在近岸浅水区的强烈非线性作用以及水沙运动间存在的相位差通常会导致传统岸滩演变模型的适用性受到限制。通过改进XBeach模型以体现波浪的非线性作用和泥沙运动的加速度和相位差效应,并通过经典波浪水槽实验数据对改进模型进行验证。结果表明,改进模型可以更准确地模拟波浪作用下的泥沙运动以及岸滩的冲淤变化趋势。利用改进XBeach模型开展了理想平直岸滩的数值实验,探讨波高和泥沙粒径的变化与岸滩运动特性之间的关系。数值实验结果表明,随着波高的增加和粒径的减小,沙坝高度和范围增大,其位置向离岸移动,冲刷深度和范围也逐渐增大;该变化规律可以从相位差效应的角度得到解释。Beach profile evolution is one of the hot issues in the study of coastal sediment kinematics.The strong nonlinear effect of wave and the phase lag between water and sand movement in the shallow water usually limit the applicability of the traditional beach evolution model.The XBeach model is improved to reflect the nonlinear effect of wave and flow and the acceleration and phase lag effect of sediment motion,and the improved model is verified by experiment data of classical wave flume.By comparing the results between the improved XBeach and XBeach,it can be concluded that the improved XBeach model has higher accuracy for the beach profile evolution under wave action.Numerical experiments on an ideal flat beach are carried out using the improved XBeach model to investigate the relationship between wave height or sediment diameter and characteristics of beach profile evolution.The numerical experiment results show that with the increase of wave height and the decrease of sediment diameter,the height and range of sand bar increase,and position of sand bar moves to offshore,and the depth and range of scour also increase gradually.This variation can be explained from phase lag effect.

关 键 词：非线性 相位差 岸滩演变 数值模拟 

分 类 号：TV148[水利工程—水力学及河流动力学]