三维水质数学模型修正及其在浙东近海海域水质模拟中的应用

【作者】 赵鑫；

【导师】 杨坤；

【作者基本信息】 浙江大学 ， 环境科学， 2012， 硕士

【摘要】 浙东近海海域大多属于陆架浅海,潮汐、潮流等海洋动力强劲,而污染物的迁移、扩散受水动力的控制。本文在前人研究成果的基础上,开展浙东近海水域实测海洋水文、水质资料的分析,根据海陆水文条件,为数学模型提供边界条件。浙江沿海水域水下地形宽浅,因此底摩阻因子对水动力变化尤为重要,从而影响到污染物的传播和扩散,所以对有限体积海岸海洋模型(FVCOM)模型的源代码中的底摩阻项进行了修改,利用浙东近海实测水下地形、潮位、潮流资料对模型进行率定,并根据典型潮过程对模型潮流验证,选用具有污染物浓度的测验资料进行浙东近海三维水质模型验证。最后,作者结合浙东近海的涉海工程,开展工程对局部水流、水质影响的模拟计算。本研究根据建立的包含浙东近海各区域的三维潮流、水质数值模型,结合SMS软件的前、后处理模块,用于生成高质量、非结构的三角形网络,并将FVCOM模式结果转移至SMS平台进行流场分析以及结果后处理,结合google earth工具,构建了潮流场和浓度场的三维动态图形显示系统。根据区域的潮流特征,开发了底部阻力参数计算模块,使之更适合目标区域的特点。本项研究通过对所构建模型的使用,证明该模型可以较好模拟我省沿海的潮汐及三维潮流特点,为浙江省海洋工程建设的前期研究提供了可靠潮流分析模型,提高了模拟的精度及深度。同时应用FVCOM建立的浙东近海海域三维水质模型,对浙江海域三维水质进行了计算,经过进一步深入研究,可以使模型更加完善,也为将来进一步发展打下了坚实的基础。更多还原

【Abstract】 Offshore areas of Zhejiang Province are mostly shelf seas, so tide and flow played an important role in the controlling of ocean dynamic. Based on the previous achievements, this study analyzed the data of hydrology and water quality of Zhejiang offshore areas, and determined the boundary conditions for the mathematical model based on hydrological conditions. Then, the FVCOM(Finite Volume Coastal Ocean Model) model was developed and rated using the data of underwater topography, tide level and tidal current. And the three-dimensional water quality model was verified according to the monitoring data of water temperature and pollutants concentration in offshore areas of Zhejiang Province. Finally, the effects of some marine projects in Zhejiang offshore areas onto local flow and water quality were simulated.This study was conducted based on the built three-dimensional tide and water quality numerical models for coastal regions of Zhejiang, and the pre-and post-processing module of the SMS software. The high-quality, non-triangular structure grids were generated, and the results of FVOCM were transferred to the SMS platform for flow analysis and post-processing. Then, combined with google earth tool, three-dimensional graphics display system for tidal current field and concentration field was built. Additionally, according to the characteristics of the regional tide flow, the module for bottom resistance parameter calculation was developed to adapt to the target area.the established modified model could well simulate the coastal tide and three-dimensional flow of Zhejiang Province. The model also provided reliable tidal flow analysis for preliminary research of the local ocean engineers, and improved the accuracy and depth of the simulation. Besides, the three-dimensional water quality model modefied from FVCOM, was used for the calculation of three-dimensional water quality of Zhejiang Province. After further investigation, the model could be more perfect and would set a solid foundation for the further development.更多还原