渤海岸线演变对水沙环境影响的累积效应

Based on the method of combining ocean dynamics with sedimentology, tracing the latest progress of research on reclamation at home and abroad, by selecting the Bohai Sea where the coastline has changed significantly in the past 40 years due to reclamation activities, taking use of the available data, building a 3-Dimensional sedimental and dynamic numerical model of Bohai Sea, to study the coastline evolution characteristics, hydrodynamic and sediment environment evolution and its mechanism. Combined with inversion of remote sensing image, analysis of on-site data and numerical simulation results, this research aims to analyzes the effects of long time reclamation activities on the coastline evolution of the Bohai Sea, to study the cumulative effects of local shoreline evolution on the hydrodynamic and sediment environment of the Bohai Sea, to explore what contribution the coastline evolution make on the evolution hydrodynamic and sediment environment, and to probe main factors that controlling the hydrodynamic and sediment environment and its mechanism. Under the background of the rapid evolution of the coastline, this study will reveal the temporal and spatial variation of hydrodynamic and sediment environment and water exchange capacity in the Bohai Sea, and provide systematic basic information and decision-making basis for the development of the Bohai Sea resources, disaster prevention and reduction, and environmental protection , serve the goal of sustainable scientific development of marine economy and environment of Bohai Sea and harmonious development of man and nature.

基于海洋动力学与沉积学相结合的方法，追踪国内外围填海研究最新进展，选择近40年来受围填海活动影响，岸线发生显著变化的渤海海湾，充分利用已有数据和资料，建立渤海三维沉积动力数值模型，开展渤海岸线演化特征、水沙环境演变及其变化机制研究。结合遥感卫星影像反演、实测数据分析以及数值模拟方法，分析长时间序列围填海活动对渤海岸线演化的影响，研究局部岸线演变对海湾水沙环境影响的累积效应，分析岸线演化对海湾水沙环境演变的贡献，探究海湾水沙环境演变的主要控制因素及其作用机制。在岸线快速演化的历史背景下，点面结合，探究渤海水沙环境、水体交换能力等时空变化规律，为环渤海资源开发、防灾减灾、环境保护等方面提供系统的基础资料和决策依据，为实现环湾海域海洋经济和环境的可持续科学发展目标以及促进人与自然和谐发展服务。

依托实测水文、悬浮体、底质等调查资料以及长时间序列海洋观测站资料，结合数值模型和遥感信息提取与反演，对渤海海域海岸线时空变化及其对海域水动力和泥沙变化的影响进行了系统的研究。阐明了渤海沿岸海岸线时空变化的基本特征与规律；对比分析了渤海海域悬浮体分布特征、影响因素及季节变化；揭示了渤海岸线变化对水沙环境演化的影响，甄别其影响要素，定量计算了悬浮体输运通量；探究了海冰对渤海海湾水动力和悬浮体分布与输运的影响；甄别了冬季东中国海浙闽近岸海流切变锋特征、其时空演化规律及控制机制，探究了悬浮体的锋面沉积效应及其对泥质带发育的贡献；揭示了亚马逊河口海域冲淡水和悬浮体变化规律与海陆相互作用规律；首次细致分析了西太暖池区短周期涡旋的基本特征及其环境效应以及对海气相互作用的贡献。本项目开展的岸线时空变化及其对水沙环境的影响研究，能够为海岸线利用和保护、海岸带管理、生态维护与修复提供科学参考；对于高纬海湾与低纬海域涡旋的拓展研究，能够为将来拓展高低纬度海域海气相互作用的关联性奠定基础，为全球边缘海在地球系统气候变化的背景下的正负反馈效应提供良好的借鉴与创新性思路。依托项目发表SCI文章5篇，核心期刊文章2篇。