夏季珠江冲淡水扩散路径分析

利用1978~1988年国家海洋局南海分局南海北部断面调查获得的盐度资料,分析了珠江口附近海域盐度的时空分布特征,描述了夏季珠江冲淡水的扩散路径。通过统计分析相应时间段的风场、平均海平面高度、珠江径流以及陆地降水等资料,讨论了影响珠江冲淡水扩散的主要因子。我们发现:夏季珠江冲淡水扩散方向与南风强度(频率和平均风速)、近岸海面月平均高度以及径流强度的关系极为密切,如果西南季风强盛,珠江冲淡水向东扩散就多;如果近岸海面高度显著增高,珠江冲淡水向西流动就特别强。

Analysis of diffuse route of the Zhujiang River diluted water in Summer

In summer,affected by southwest monsoon,one part of the Zhujiang River outflow from Linding Island and Medaomen diffuse to east,another part of the Zhujiang River outflow from Jitimen Hutiaomen Yamen diffuses to west.The part westward accounts for 1/3 of the Zhujiang River's total runoff.Despite the range of the westward part is decreased,the western part is still very strong because the total runoff of the Zhujiang River is more greater than winter's.Based on the analyse of the wind field data,the average sea level data,the runoff water of Zhujiang River and precipitation in land,the paper discusses the factors affecting the diffusing route of the Zhujiang River diluted water.In summer,the runoff diffusing direction has close relation with monsoon intensity(frequency and average wind force),monthly average coastal sea level height and total amount of runoff.When monsoon intensity is close to average level,and the change of coastal sea level height is salient,the runoff diffusing direction is decided by coastal sea level.When the change of coastal sea level height is close to average level,and monsoon intensity is salient,the runoff diffusing direction is decided by monsoon direction.When the change of coastal sea level height is close to average level,and monsoon intensity is close to average level too,the flow is diffuse near the Zhujiang Estuary.