利用海浪谱共轭方程进行东海敏感性区域分布研究

近岸局部范围内的波浪是由远处洋面上生成并传播过来的，它的生成发展源地(敏感性海域)对于所关注范围的波浪起决定性影响。共轭方程中的模式变量反映了物理参量的梯度变化，利用它可以达到精确确定敏感海域具体位置的目的。本文在LAGFD-WAM海浪模式基础上建立了海浪谱共轭方程，提出了通过在关注点邻域加一小扰动作为逆向积分海浪谱共轭方程的驱动项，来计算出梯度极值分布的思想。将这一思想应用于东中国海区域，通过一系列试验来确定舟山及长江口附近海域的敏感性区域位置。试验结果符合物理意义，梯度极值分布结果为下一步的多源卫星观测资料复合分析及最优实测方案设计奠定了基础。

SENSITIVITY STUDY IN THE EAST CHINA SEA BY USING THE WAVE SPECTRUM ADJOINT EQUATION

Offshore ocean waves are originated and propagated from faraway ocean surface which is called a sensitivity region for wave evolution. Because the model variables in the adjoint equation represent the gradient of physical parameters, it can be utilized to determine the exact sensitivity region. Here the wave spectrum adjoint equation is developed based on the LAGFD-WAM Wave Model. A method to estimate the gradient distribution is proposed by adding a perturbation as a driving term to the adjoint equation. Numerical experiments are performed for both the Zhoushan fishing ground and Changjiang estuary area. And the results are reasonable and are important for future data syncretizing and optimal observing design.