摘要
长江河口区的月平均海面变化主要受径流及其它海洋水文气象因子的作用,而且具有明显的季节性变化。本文为了探讨月平均海面时空变化的规律,运用了经验特征函数,对月平均海面的时空变化进行分解。以三个相互正交模型,估算了水文气象因子在月平均海面变化中所起的作用。
The most obvious feature of the short term sea-level variations in the Changjiang estuarine area is the seasonal cycle, which is dominated by the runoff of the Changjiang river and a variety of ocean processes as well as other factors. The monthly mean sea-level changing range is from 40 cm to 70 cm. The changing magnitudes are significant within the estuary and decrease seaward due to the expansion of the runoff and the actions of other factors; consequently, the fluctuations of sea-surface slope varies with different seasons. The highest gradient occurs during the summer and autumn, and the lowest gradient occurs in the winter.
Spatial and temporal patterns of monthly mean sea-level of the Changjiang estuarine area have been calibrated by eigenfunction models identifying several distinct factors which influence on the monthly mean sea-level. The most significant factors are the variations in the runoff, atmospheric pressure and temperature, which account for about 45%, 23%, and 26% of total amount of monthly mean sea-level changes respectively, and the other two factors are abnormal change of the river runoff and the set-up resulting from moonson.
出处
《地理学报》
EI
CSSCI
CSCD
北大核心
1990年第4期441-450,共10页
Acta Geographica Sinica
基金
国家自然科学基金
关键词
长江
河口区
海面
季节
变化
分析
Changjiang Estuary
Monthly mean sea level
Eigenanalysis
