海平面上升导致潮波系统变化的机理(Ⅱ)--基于数值模拟的研究  

Mechanism of the Change of Tidal Amphidromic System Due to the Rise of Mean-Sea-Level(MSL)(Ⅱ):Investigation Based on Numerical Modeling

作　　者：于宜法[1] 刘兰[1] 郭明克[2] 颜梅[1] 

机构地区：[1]中国海洋大学,山东青岛266100 [2]国家海洋局北海预报中心,山东青岛266071

出　　处：《中国海洋大学学报（自然科学版）》2008年第6期875-882,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(40676013)资助

摘　　要：利用潮波基本方程数值模拟了湾口朝南的不同矩形海湾和曲折岸线海湾中海平面上升引起的潮位振幅和位相变化。根据矩形海湾中的模拟结果可以看出,如果忽略潮波方程中的非线性项,潮位振幅变化ΔR和位相变化Δθ的空间分布特征与基于理论模型在矩形海湾所获得的特征相当接近;当考虑方程中的非线性项时,不包括较深的海湾,正负ΔR的分界线变成1条通过无潮点附近的封闭曲线,而不是线性情况下的1条通过无潮点附近大致东西走向的曲线。另外也发现,在曲折岸线的海湾内,如果忽略非线性项,正负ΔR的分界线是1条通过2个无潮点的半环状的曲线,当考虑非线性项时,出现2条正负的分界线,它们是通过各自无潮点附近的封闭曲线。就ΔR的强度来说,非线性项使得正ΔR的强度减弱,在较浅水海湾中的ΔR强度大于较深水海湾中的强度,海底横向倾斜的海湾中的ΔR强度大于较浅水海湾中的强度。ΔR最强的区域位于无潮点附近的一段ΔR分界线之两侧。Numerical modeling of the changes of tidal amplitude and phase due to the MSL rise was made by the use of tidal basic equations in rectangular bays with mouths open to the south and tortuous bays. It was concluded from the results obtained in the rectangular bays that, if the nonlinear terms were ignored, the distribution characteristics of tidal amplitude change △R and phase change △θ were rather close to those based on theo- retical model in a rectangular gulf, and that when the nonlinear terms were taken into account, expect for deep- er bays, the dividing line between positive and negative, AR became a enclosed curve passing by the am- phidromic point, instead of a curve approximately in the west-east direction as in the linear case. It was also found that in a tortuous bay, if the nonlinear terms were ignored, the dividing line of positive and negative △R was a semi-ringlike curve passing by two amphidromic points, and that when the nonlinear terms were consid- ered, there were two dividing lines which were two enclosed curves passing by respective amphidromic points. As for the strength of △R, the nonlinear terms in the equtions caused the strength of positive △R to weaken, the strength of △R in a shallower bay was larger than that in a deeper bay, the strength of △R in a bay with a transverse slope of the bottom was larger than that in a shallower bay. The areas with the strongest △R were located on the two sides of the segment of dividing line near the amphidromic points.

关 键 词：海平面上升 潮位振幅和位相变化 非线性效应 海底和岸线的影响 

分 类 号：P731.23[天文地球—海洋科学]