珠江八大口门2016年枯季盐度同步观测及咸淡水混合研究  

SYNCHRONOUS OBSERVATION OF SALINITY FOR SALT-FRESH WATER MIXING AT THE EIGHT ENTRANCES OF PEARL RIVER IN DRY SEASON OF 2016

作　　者：乐灿 王永红[1] 杨远东 杜佳 YUE Can;WANG Yonghong;YANG Yuandong;DU Jia(Key Laboratory of Submarine Geosciences and Prospecting Techniques,Ministry of Education,College of Marine Geosciences,Ocean University of China,Qingdao 266100,China)

机构地区：[1]海底科学与探测技术教育部重点实验室,中国海洋大学海洋地球科学学院,青岛266100

出　　处：《海洋地质前沿》2021年第1期51-60,共10页Marine Geology Frontiers

基　　金：国家重点研发计划(2016YFC0402602);国家海洋局公益性项目(201405037);国家自然科学基金(41376054,41176039,41410304022,U1606401)。

摘　　要：通过分析2016年枯季在珠江三角洲8个口门测站的现场同步观测盐度资料,总结了枯季八大口门同步盐度垂向分布和盐淡水混合特征。结果表明:由于八大口门的水动力条件、河口走向等不同,各口门的盐水入侵强度、盐淡水混合程度存在时空差异。其中,在盐度分布上表现为以横门为中心,向东西两侧口门,盐度逐渐递增;在层化参数分布上,总体上由横门向东分布的洪奇沥、蕉门、虎门的层化参数依次递减,横门向西分布的磨刀门、鸡啼门、虎跳门、崖门的层化参数依次递减;在一个潮周期内,盐水入侵程度、盐淡水混合强度随着潮涨潮落表现出周期性特点。盐度垂向上从上往下逐渐增大,并存在盐度拐点。一般潮汐动力越强,盐度拐点的位置越高。八大口门中,一般虎门、崖门的垂向盐度拐点位置最高;蕉门、洪奇沥、横门的垂向盐度拐点位置最低。Salinity vertical distribution and salt-fresh water mixing process were summarized by sorting out and analyzing salinity data synchronously observed at eight estuaries of the Pearl River during the dry season of 2016.The results showed that due to the differences in hydrodynamic conditions at the eight estuaries and the direction of each estuary,the invasion intensity of salt water and the mixing degree of salt and fresh water at each estuaries showed differences in time and space distribution.The salinity distribution is characterized by a gradual increase to both east and west directions,with Hengmen as the center.On the whole,the stratification parameter was the minimum at Hengmen and decreases gradually with Hengmen as the center to the east and west.In a tidal cycle,the intrusion degree of salt water and the mixing strength of salt and fresh water showed periodic characteristics with the ebb and flow of the tide.Salinity gradually increases from the top to the bottom and there exists a point where salinity changes rapidly in the vertical direction.Generally,the stronger the tidal force is,the higher the position of this point will be for the eight estuaries,the highest position of that point is oberserved at Humen and Yamen,and the lowest at Jiaomen,Hongqili and Hengmen.

关 键 词：盐度分布特征 咸淡水混合特征 珠江八大口门 枯季 

分 类 号：P731[天文地球—海洋科学]