地理学报 ›› 1990, Vol. 57 ›› Issue (4): 441-450.doi: 10.11821/xb199004006

• 论文 • 上一篇    下一篇

长江河口区平均海面季节性变化的分析

沈健, 王宝灿   

  1. 华东师范大学河口海岸研究所,上海
  • 出版日期:1990-10-15 发布日期:1990-10-15
  • 基金资助:
    国家自然科学基金

ANALYSIS OF SEASONAL CHANGE OF MEAN SEA-LEVEL IN THE CHANGJIANG ESTUARINE AREA

Shen Jian, Wang Baocan   

  1. Institute of Estuarine and Coastal Research; East China Normal University, Shanghai
  • Online:1990-10-15 Published:1990-10-15

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。

关键词: 长江河口, 月平均海面, 经验特征函数

Abstract: The most obvious feature of the short term sia-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-leve1 of the Changjiang estuarine area have been calibrated by eigenfunction models identifying several distinct factors which in- fluence on the monthly mean sea-level. The most significant factors arc the variations in she 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.

Key words: Changjiang Estuary, Monthly mean Sea level, Eigenanalysis