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珠江口磨刀门枯季水文特征及河口动力过程
引用本文:贾良文,吴超羽,任杰,雷亚平,周水华.珠江口磨刀门枯季水文特征及河口动力过程[J].水科学进展,2006,17(1):82-88.
作者姓名:贾良文  吴超羽  任杰  雷亚平  周水华
作者单位:1.广东省航道局, 广东, 广州, 510115;
摘    要:根据磨刀门2003年12月9~15日的大、中潮同步水文观测资料,分析了磨刀门枯季的潮汐、潮流、余流、悬移质含沙量、盐度等水文特征,并对枯季河口动力过程,如咸淡水混合、河口射流等进行了初步研究。在枯季由于径流较弱,潮流成为主要动力。表层由于受径流和风的影响余流基本上沿河道走向向下游,中层以下有稳定的向上的余流存在。枯季磨刀门含沙量较小(<1 kg/m3),盐度在平面上和垂向上均有一定变化。磨刀门枯季咸淡水混合类型为缓混合型,各站盐度分层参数均在0.01~1.0。从实测流速的分布情况来看,河口下层有反向的水流,存在明显的因密度差而形成的密度环流。根据枯季实测资料计算所得的密度弗劳德数,磨刀门枯季以浮力射流为主。

关 键 词:磨刀门    枯季    水文特征    河口动力过程
文章编号:1001-6791(2006)01-0082-07
收稿时间:2004-10-12
修稿时间:2004-12-30

Hydrologic characteristics and estuarine dynamic process during the dry season in Modaomen Estuary of the Pearl River
JIA Liang-wen,WU Chao-yu,REN Jie,LEI Ya-ping,ZHOU Shui-hua.Hydrologic characteristics and estuarine dynamic process during the dry season in Modaomen Estuary of the Pearl River[J].Advances in Water Science,2006,17(1):82-88.
Authors:JIA Liang-wen  WU Chao-yu  REN Jie  LEI Ya-ping  ZHOU Shui-hua
Institution:1.Guangdong Provincial Waterway Bureau, Guangzhou 510115, China;2.Coastal Ocean Research Center of Zhongshan University, Guangzhou 510275, China
Abstract:Based on the data from the tidal-gauge stations and synchronously surveyed data during Dec.9-15,2003,the present paper provides a brief analysis of the characteristics of tide,the residual currents,the suspended sediment content and salinity during the dry season at the Modaomen Estuary of the Pearl River.The preliminary research are made on the estuarine dynamic process,including the mixing of fresh water and salt water and the estuarine jet.During the dry season,the tidal current becomes dominant due to the weakened run-off.The surface residual current at each station basically goes downstream along the river course due to the effect of the runoff and wind,while the residual current near the mouth,below the middle layer,goes stably upstream.In the dry season,the suspended sediment content in the Modaomen is very small(<1 kg/m~3) and the salinity changes both along the longitudinal and the vertical direction at the Modaomen Estuary.The fresh water and salt water mixes with the N parameter between 0.01 and 1 at all stations.The surveyed velocity configuration shows that the gravitational circulation exists near the mouth caused by the density difference.In light of the densimetric Froude number calculated through the actual surveyed data,the estuarine jet in the dry season in the Modaomen Estuary is buoyant.
Keywords:Modaomen Estuary  dry season  hydrologic characteristic  estuarine dynamics  
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