摘要
利用磨刀门水道天河以下至挂定角水闸之间8个水厂/水闸的表层盐度数据,通过拉格朗日插值方法并结合Surfer工具作出磨刀门水道近3个月的纵向逐时咸界分布图,给出了0.5‰,2‰,5‰和8‰咸界的逐时变化情况,并对其运动规律进行了初步探讨。特别对0.5‰每日最远咸界进行了分析,结果发现:磨刀门水道盐水入侵咸界运动有半月的周期,同时上半月和下半月又不完全一致,下半月因潮差较大产生2次盐水上溯。盐水在小潮期间向上游推进,在大潮期间向下游推移。每日咸界上溯最远点发生时间要比每日最高潮时延后5h。0.5‰每日最远咸界与潮差的运动关系图表现出在上半月潮差较小呈圈型,而在下半月潮差较大产生2次盐水上溯呈勺型。
With the data of surface water salinity from 8 water gates,the Lagrange interpolation method and the Surfer software as tools,this paper draws the hourly longitudinal saltwater intrusion-border of Modaomen Channel in the past 3 months.The results show the hourly changes of the 0.5‰,2‰,5‰ and 8‰ saltwater intrusion-borders,and their movement law is discussed based on these results.We have made special analysis of the 0.5‰ daily farthest intrusion-border and found a half-month period for the saltwater intrusion-border of Modaomen Channel.But the movement for the first half of the month is not identical to that of the second half.The saltwater moves upstream during neap and downstream during spring tide.The time saltwater tracing farthest is 5 hours later than the climax that occurs daily.The daily farthest 0.5‰ saltwater border and tidal range chart show the tidal range curve is ring-shaped in the first half of the month,and spoon-shaped in the second half because the greater tidal range causes the saltwater to move upstream again.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第S2期122-125,共4页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
国家自然科学基金资助项目(10772204)
关键词
磨刀门水道
盐水入侵
咸界运动规律
Modaomen Channel
saltwater intrusion
movement of the saltwater intrusion-border
