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根据珠江三角洲网河区29个验潮站的实测验潮记录,应用傅氏变换与最平滤波器串联的方法来消除月均序列的周期波动对确定水位变化趋势的影响,由低通序列一元线性回归分析确定各站水位的变化趋势;结果表明,周期波动对确定海平面变化趋势的影响是显著的.应用经验正交函数（EOF）对网河区的水位变化场进行分解,由相互独立的时间函数和空间特征函数表征网河区区域的水位变化特征;应用时间特征函数计算区域水位的平均变化率为0.02mm/a.根据验潮站的水位变化趋势,探讨网河区水位变化与河床冲淤的关系.
According to the measured tide record of 29 tide gauge stations in the Wanghe area of the Pearl River Delta, the effect of the periodic fluctuation of the monthly mean sequence on determining the trend of water level changes is solved by the Fourier transform and the most flat filter series method. The low- Linear regression analysis was used to determine the trend of water level at each station.The results showed that the effect of periodic fluctuation on the determination of sea level change was significant.Using empirical orthogonal function (EOF) to decompose the water level change in the network area, Time function and spatial characteristic function are used to characterize the water level variation in the network area. The average rate of change of regional water level is 0.02mm / a using the time characteristic function. According to the trend of water level change in the tide gauge station, Riverbed scouring relationship.