越南沿海若干验潮站长期观测资料的潮汐分析

为掌握越南沿海潮汐分布特征和变化规律,利用越南沿海HONDAU、HONNGU、DANANG、QUYNHON、VUNGTAU和RACHGIA共6个验潮站长期观测资料进行了调和分析,计算了主要分潮O1、P1、K1、Q1、M2、S2、N2、K2以及交点分潮Mn等长周期分潮的调和常数。计算结果表明,越南沿海地区潮汐特征复杂,极易受季节性海平面变化的影响。分析得到的18.61年交点分潮Mn空间分布不均匀,且明显高于其理论平衡潮振幅,可能与非潮汐低频海平面变化有关。

Tidal Harmonic Analysis of Long Time Series ofTide Gauge Data Along the Coast of Vietnam

In order to better understand the tidal characteristics and change along the coast of Vietnam,harmonic tidal analysis of long time series at six tide gauge sites i.e.HONDAU,HONNGU,DANANG,QUYNHON,VUNGTAU and RACHGIA,is performed to calculate harmonic constants of main principleconstituents O1,P1,K1,Q1,M2,S2,N2,K 2.and long period tide,such as nodal tide Mn.The results showthat the characteristics of tide along coastline of Vietnam is complex,and coastal zone is more vulnerable atthe time when the seasonal sea level at its highest.The observed amplitudes of the 18.6-year nodal tide Mnalong Vietnam coast are relatively unevenly spatial distributed,and significantly exceed its theoreticalamplitudes,which are less than 1.cm.The analysis signals at Mnfrequency are of mostly non-tidal origin,part of decadal ocean variability.