二维赤潮生态数学模型及其在渤海的应用

Two-dimensional ecological mathematical model of red tide and its application in the Bohai Sea

采用ADI的有限差分方法对不可压缩流体二维浅水环流方程离散和求解,建立水动力数学模型,用迎风格式离散赤潮生物动力学方程,通过水动力学和生物动力学相结合的方法,建立了二维赤潮生态数学模型。将所建立的二维赤潮生态数学模型应用于渤海,针对渤海海域2004年6月11～16日发生的棕囊藻赤潮进行了数值计算。对EOS/MODIS卫星拍摄的2004年6月份的渤海海区卫星遥感图像进行了处理,提取出海水中的赤潮信息,并计算出赤潮面积,使其与模型计算出的赤潮面积进行对比验证,结果基本吻合,表明该模型能够较好地模拟赤潮的生消过程,为渤海地区的赤潮预报提供了科学依据。

The two-dimensional ecological mathematical model of red tide was established by combining water dynamics with biological dynamics.The water dynamics mathematical model was established by dispersing and solving the incompressible two-dimensional circulation equations in shallow water by the ADI（Alternating Direction Implicit） Method of the finite difference method,and the red tide biodynamic equations was dispersed by upwind scheme.The established 2D ecological mathematical model of red tide was applied to calculate the red tide of Phaeocystis,which occurred in the Baohai Sea during the period of June 11～16^th,2004.Satellite remote sensing data of the red tide area and calculation results based on the model were in good agreement.It shows that the model can simulate the process of growth and death of red tide well and provide scientific basis for red tide forecast in the Bohai Sea.