采用半隐式的ECOMSED(Estuarine,Coastal and Ocean Modeling System with Sediments)三维海洋紊流模式,建立湛江湾湾顶水道的三维潮流数值模型。模型的水平方向采用加密的正交网格以贴合岸线边界,垂向上采用σ坐标以更好地拟合海底地...采用半隐式的ECOMSED(Estuarine,Coastal and Ocean Modeling System with Sediments)三维海洋紊流模式,建立湛江湾湾顶水道的三维潮流数值模型。模型的水平方向采用加密的正交网格以贴合岸线边界,垂向上采用σ坐标以更好地拟合海底地形。通过验证,模拟结果与实测数据符合良好,表明运用该模型可以较好地预报湛江湾的潮流动力特性。为进一步研究湛江湾水道附近水域的温盐变化、泥沙输运提供技术支持。展开更多
Considering three-dimensional model ECOMSED can not simulate wetting-drying of shoal with its fixed boundary, an approach to represent moving boundary in the model is introduced here. This approach smoothly joints the...Considering three-dimensional model ECOMSED can not simulate wetting-drying of shoal with its fixed boundary, an approach to represent moving boundary in the model is introduced here. This approach smoothly joints the internal and external mode by making use of wetting and drying technique and is verified by a numerical test which presents a good agreement with the previous test results obtained by other researchers. A three dimensional numerical model is established to simulate the hydrodynamics in spring tide in the Changjiang （Yangtze） River estuary by this modified ECOMSED model which is also validated through the observed field data, the simulation presents a good periodic tidal change. It also successfully simulates the tidal current of computational areas and reproduces the tidal flat intermittent appearance.展开更多
近岸海域水交换不仅反映区域水体的物理自净能力,还能揭示污染物迁移扩散过程。为探究闽江口水交换特性,基于河口、陆架和海洋沉积物模型(estuarine,coastal and ocean model system with sediments,ECOMSED)与Lagrange粒子追踪模型,通...近岸海域水交换不仅反映区域水体的物理自净能力,还能揭示污染物迁移扩散过程。为探究闽江口水交换特性,基于河口、陆架和海洋沉积物模型(estuarine,coastal and ocean model system with sediments,ECOMSED)与Lagrange粒子追踪模型,通过实测数据拟合验证,构建了闽江口海域的三维数值模型,在此基础上开展风场、热通量、径流、潮流等外部环境影响因素的模拟实验。结果表明:闽江口水交换具有显著的垂向分层现象,中层水交换能力最强,表层污染物在海表热通量和风场影响下呈北向迁移趋势;川石水道以南水域水体自净能力强于川石水道北部水域;径流对闽江口水交换驱动作用最显著,关闭径流后,各层粒子滞留比例高达69%~75%。这些发现对于闽江口的污染物治理、水质变化预测等具有指示意义,能够为闽江河口海域环境保护提供科学依据与技术支持。展开更多
文摘采用半隐式的ECOMSED(Estuarine,Coastal and Ocean Modeling System with Sediments)三维海洋紊流模式,建立湛江湾湾顶水道的三维潮流数值模型。模型的水平方向采用加密的正交网格以贴合岸线边界,垂向上采用σ坐标以更好地拟合海底地形。通过验证,模拟结果与实测数据符合良好,表明运用该模型可以较好地预报湛江湾的潮流动力特性。为进一步研究湛江湾水道附近水域的温盐变化、泥沙输运提供技术支持。
基金The Foundation of Shanghai 908 (PJ4)the key project of the national eleventh five-year science and technology planning supported by The Ministry of Science and Technology under contract No 2008BAJ08B14the key project for the funda-mental science and technology research supported by The Ministry of Science and Technology under contract No 2007FY110300-03
文摘Considering three-dimensional model ECOMSED can not simulate wetting-drying of shoal with its fixed boundary, an approach to represent moving boundary in the model is introduced here. This approach smoothly joints the internal and external mode by making use of wetting and drying technique and is verified by a numerical test which presents a good agreement with the previous test results obtained by other researchers. A three dimensional numerical model is established to simulate the hydrodynamics in spring tide in the Changjiang （Yangtze） River estuary by this modified ECOMSED model which is also validated through the observed field data, the simulation presents a good periodic tidal change. It also successfully simulates the tidal current of computational areas and reproduces the tidal flat intermittent appearance.
文摘近岸海域水交换不仅反映区域水体的物理自净能力,还能揭示污染物迁移扩散过程。为探究闽江口水交换特性,基于河口、陆架和海洋沉积物模型(estuarine,coastal and ocean model system with sediments,ECOMSED)与Lagrange粒子追踪模型,通过实测数据拟合验证,构建了闽江口海域的三维数值模型,在此基础上开展风场、热通量、径流、潮流等外部环境影响因素的模拟实验。结果表明:闽江口水交换具有显著的垂向分层现象,中层水交换能力最强,表层污染物在海表热通量和风场影响下呈北向迁移趋势;川石水道以南水域水体自净能力强于川石水道北部水域;径流对闽江口水交换驱动作用最显著,关闭径流后,各层粒子滞留比例高达69%~75%。这些发现对于闽江口的污染物治理、水质变化预测等具有指示意义,能够为闽江河口海域环境保护提供科学依据与技术支持。
