| 长江河口区平均海面季节性变化的分析 |
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| 引用本文： | 沈健,王宝灿.长江河口区平均海面季节性变化的分析[J].地理学报,1990,45(4):441-450. |
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| 作者姓名： | 沈健 王宝灿 |
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| 作者单位： | 华东师范大学河口海岸研究所 上海
(沈健)，华东师范大学河口海岸研究所 上海(王宝灿) |
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| 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。
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| 关 键 词： | 长江 河口区 海面 季节 变化 分析 |
ANALYSIS OF SEASONAL CHANGE OF MEAN SEA-LEVEL IN THE CHANGJIANG ESTUARINE AREA |
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| Shen Jian Wang Baocan.ANALYSIS OF SEASONAL CHANGE OF MEAN SEA-LEVEL IN THE CHANGJIANG ESTUARINE AREA[J].Acta Geographica Sinica,1990,45(4):441-450. |
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| Authors: | Shen Jian Wang Baocan |
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| Abstract: | 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. |
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| Keywords: | Changjiang Estuary Monthly mean sea level Eigenanalysis |
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