排海污水浮射流的运动过程及其环境效应是近海水环境高精度动态预报急需解决的关键科学问题，其难点在于如何正确反映波浪和潮流（水流）环境对浮射流在近区段扩算和稀释过程的影响。本项目在申请人已完成的"波浪作用下浮射流动力特性研究"的基础上，进一步考虑波浪和水流共同作用的影响，采用物理实验、数值模拟和量纲分析相结合的方法，重点研究波流共同作用下浮射流的三维运动形态，分析波浪、水流和浮射流之间的动力耦合机制，探究波流环境中浮射流的紊动结构和流场特征；在此基础上进一步研究波流环境对浮射流稀释过程的影响，建立沿程稀释度与动力因子之间的相关关系，预测浮射流近区段污水浓度的时空变化，确定浮射流到达远区段时污水浓度的大小。本项目的研究成果对于完善近岸海域水环境的预报技术、指导排污工程的科学布局、丰富复杂动力环境下浮射流运动的基础理论，促进海岸动力学和环境水力学等交叉学科的发展有着重要的现实意义和科学价值。

The dynamic processes of buoyant jets, induced by the coastal wastewater discharge, and their impacts on the ambient environment are very important for the high-resolution dynamic forecasting of environmental water quality in the coastal zone. How to accurately account for the effects of combined wave and current action on the buoyant jets is one of key problems to be solved. Following the previous study on the dynamic characteristics of buoyant jets under the pure wave environment, this study will focus on the jet dynamic behaviours and dilution processes under the co-existing wave and current environment. The jets' three-dimensional flow patterns and their forming reasons will be investigated, and then the distribution of velocity and concentration fields as well as the wastewater dilution processes will be quantitatively examined. The outcomes of this study could be used to predict the distribution of pollution concentration in the near field as well as the initial concentration at the beginning of the far field. Therefore, this study is of theoretical significance in the enrichment of the fundamental theory of buoyant jets in complex dynamic environments, as well as of practical significance in the improvement of modelling accuracy for the large-scale environmental forecasting.