海洋牧场建设作为实现海洋渔业资源可持续利用和生态环境保护统一的手段，具有积极的作用。然而，在人类活动和气候变化的双重压力下，近海海洋牧场的低氧现象愈发严重，低氧的频率在提高、面积在扩大、程度在加重。本项目拟从近海海域存在潮汐能这一有利自然条件出发，开展潮汐能人工诱导下降流技术的基础研究，研制结构简单、造价低廉、长期可靠工作、投放维护方便、经济、社会与生态效益高的人工诱导下降流样机，突破国外近海增氧工程投资巨大、性价比低的困境。重点研究内容包括潮汐能人工诱导下降流构件的水动力特性、流场效应和调控研究，揭示其最优化构型和工作机理；通过样机研制、优化改进和海域试验，验证潮汐能人工诱导下降流技术的可行性，从而为我国海洋牧场低氧防治提供理论基础和技术支撑。

Marine ranches have positive effects on achieving both sustainable utilization of fishery resources and ecological protection. However, due to the impacts of the human activities and climate change, the marine ranches have been suffering bottom water hypoxia with increasing frequency, area and intensity. This project performs basic research about tide-induced artificial downwelling based on the assumption of rich tidal energy in coastal ocean. A prototype of a tide-induced downwelling device, which is structurally simple, cost-effective, reliable, convenient to maintain and of good social-economic effects, will be developed to break through the bottleneck of huge investment and of a low cost-performance ratio. The research content includes the study on the hydrodynamic performance of a tide-induced downwelling device and on the effect and regulation of external flow field, in which the optimal design for the prototype is made; also on verifying the viability of tide-induced artificial downwelling via sea trial experiments, which provides our country with theoretical basis and technical support for the hypoxia mitigation in the marine ranches.