摘要
利用珠江三角洲河口区９个站的验潮记录资料，应用最平滤波器对月均验潮序列进行低通数字滤波，消除高频扰动对确定海平面变化趋势的影响．应用经验正交函数（ＥＯＦ）对水位变化的典型场进行分解，根据各特征模态的空间特征函数的分布和时间特征函数的变化来分析河口区水位变化的时空特征．应用交叉熵谱探讨水位变化在频域上对流量、气温、气压和风的响应．ＥＯＦ分解表明，近几十年来珠江三角洲河口区水位的平均变化率为２．１ｍｍ／ａ．
Tide gauge records were collected from nine stations. High frequency components were removed form monthly mean time series by the Maximum Flat Filter. Three orthogonal eigenmodes which accounted for 93% of the total variance of the low passed time series were found through EOF analysis. According to the distribution of spatial and temperal eigenvectors, the characteristics of the water stage variability in the Pearl River Delta area were discussed. The overall average rate of water stage change is 2. 1 mm/a. Based on co-spectrum analysis,the frequency responses of water stage to variations in river discharge, wind, atmospheric pressure and atmospheric temperature were discussed.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
1996年第3期104-109,共6页
Acta Scientiarum Naturalium Universitatis Sunyatseni
关键词
水位变化
高频扰动
珠江三角洲
海平面
water stage variability, high frequency components, empirical orthogonal funtion,Pearl River Delta estuaries
