波流共同作用下射流稀释特性的动量积分模拟研究  

Simulation of a jet under the combined action of waves and currents using a momentum integral model

作　　者：陈永平[1,2] 李醒非 方树桥 徐振山[1,2] 陈雨航 Ebenezer Otoo Chen Yongping;Li Xingfei;Fang Shuqiao;Xu Zhenshan;Chen Yuhang;Ebenezer Otoo(The National Key Laboratory of Water Disaster Prevention,Hohai University,Nanjing 210098,China;College of Harbor,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China;Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China;Key Laboratory of Ocean Space Resource Management Technology,Ministry of Natural Resources,Hangzhou 310012,China)

机构地区：[1]河海大学水灾害防御全国重点实验室,江苏南京210098 [2]河海大学港口海岸与近海工程学院,江苏南京210098 [3]自然资源部第二海洋研究所,浙江杭州310012 [4]自然资源部海洋空间资源管理技术重点实验室,浙江杭州310012

出　　处：《海洋学报》2024年第2期1-13,共13页

基　　金：国家自然科学基金项目(51979076,52211530103)。

摘　　要：污水通常以射流的形式向海排放,其在海洋环境水体中的稀释过程是射流与波浪、潮流共同作用的结果。本文基于合理的假设条件,对射流运动的控制方程进行积分处理,结合波流环境下射流的结构特征,引入射流卷吸与拖曳力函数,结合必要的边界条件,形成封闭的控制方程组,建立波流环境下射流动量积分模型。通过与实验资料的对比分析可以看出,该模型可以准确模拟波流环境下射流在近区段的时均运动与稀释过程;相较于单一的横流作用,波流共同作用下射流对周边水体的影响范围更大,射流初始稀释能力更强。基于多个组次的动量积分模拟实验,通过无量纲分析与最小二乘拟合,建立了波流共同作用下射流轨迹中心线位置及最小稀释度的经验公式。相关成果可为排海污水环境影响评估提供快速、准确的分析手段。Wastewater is usually discharged into the sea in the form of jet,and its dilution process is the result of the interaction of jet,wave and tidal current.In this study,based on the reasonable assumptions,the governing equations are integrated to the form of ordinary differential equations.According to the hydrodynamic characteristics of the jet in the wavy current environment,the entrainment and drag force functions of the jet are introduced to close the governing equations,thus the integral model for the turbulent jet under the combined action of waves and currents is established.Through comparison and verification,it is confirmed that the integral model can accurately simulate the time average movement and dilution process of the near-field jet under the wavy current environment.It is found that compared with a pure current environment,the influence range of jet on the surrounding water is larger than that in a wavy current environment,and the dilution capacity of jet can be remarkably enhanced by the wave effect.Based on the momentum integral simulation results,the empirical fitting formulas for the position of the jet cross-sectional trajectory line and the minimum dilution in the wavy current environment are established.The developed model could be served as an efficient and accurate tool to assess the environmental impacts of submarine outfalls on the surrounding waters.

关 键 词：波流环境 射流 动量积分模拟 射流轨迹 稀释度 

分 类 号：P731[天文地球—海洋科学]