舟山海域潮汐特征及调和分析精度研究

Research on Tidal Characteristics and Harmonic Analysis Accuracy in the Zhoushan Sea Area

浙江舟山海域岛屿多、地形复杂,潮波受影响因素多。本文基于舟山海域多年实测潮汐资料,采用最小二乘法进行潮汐调和分析发现,舟山海域M2分潮在潮位中占主导地位,近岸振幅大、离岸振幅小,自舟山海域西南侧东门岛至东北方向中块岛,振幅逐渐减小;舟山海域调和分析精度离岸距离越远精度越高,自西南海域至东北海域调和分析精度逐渐增大;各月度余水位分布规律不明显,各月度呈交错状态,但整体来说,舟山海域的余水位相对较小。

As the numerous islands and complex geography in the Zhoushan sea area of Zhejiang Province,the tide wave is affected by multiple factors.Utilizing the long-term measured tide data,coupling with harmonic analysis by the least square method,we propose that the M2 tidal constituent in the Zhoushan sea area is dominant.And its nearshore amplitude is large,whereas the offshore amplitude is decreased.Therefore,from Dongmen island located on the southwest side of the Zhoushan sea area to Zhongkuai island,which is on the northeast side,the amplitude gradually reduces.Furthermore,the harmonic analysis accuracy is higher following the offshore distance and increases from the southwest sea area to the northeast.Besides,there is no significant distribution pattern of monthly residual water level,while it exhibits the alternating condition.In general,the residual water level in the Zhoushan sea area is relatively low.