基于水幕方法的珠江河口抑咸对策  

Study on measures of saline water intrusion control to Pearl River Estuary based on water curtain method

作　　者：王青 吕紫君 孙杰 吴彦 韩笑 孔俊 WANG Qing;LYU Zijun;SUN Jie;WU Yan;HAN Xiao;KONG Jun(Key Laboratory of Coastal Disaster and Defence(Hohai University),Ministry of Education,Nanjing 210098,China;Nanjing Water Planning and Designing Institute Corp.Ltd,Nanjing 210006,China)

机构地区：[1]河海大学海岸灾害及防护教育部重点实验室,江苏南京210098 [2]南京市水利规划设计院股份有限公司,江苏南京210006

出　　处：《水资源保护》2018年第5期50-56,共7页Water Resources Protection

基　　金：水利部公益性行业科研专项(201501010);江苏省六大人才高峰培养项目(HYGC-004);河海大学海岸灾害及防护教育部重点实验室开放基金(201706)

摘　　要：基于数值模拟手段,论证水幕方法扰动底层盐水楔实现抑制咸潮入侵的可行性。结果表明,在磨刀门河道上游深槽设置水平喷水干扰盐水楔,可以有效减弱底层盐水浓度,在底部高盐水团附近喷水的抑咸效果优于其他断面,并且喷水流量存在最优值,当小于该值时,咸潮上溯距离随流量的减小逐渐增大,当大于该值时,咸潮上溯距离随流量的增大逐渐增大。进一步研究发现磨刀门河口地区小潮期进行盐水楔扰动的效果最好,低盐度等值线(≤0. 5‰)向外海退缩程度显著,有利于河口区取水。Based on numerical simulations,the feasibility of disturbing the bottom saline water wedge to control saline water intrusion by water curtain method is studied.The results show that the concentration of the bottom saline water can be effectively reduced by setting level jets in the deep channel of the upper reach;The position of the best saline water intrusion control effect is near the bottom of the high saline water mass;There is an optimal water flow value.When water flow is less than the value,saline water intrusion length increases with the decrease of flow.When water flow is more than the value,saline water intrusion length increases with the increase of flow.Further studies show that the best phase of disturbing the saline water wedge is setting level jets during neap tide.Low salinity contours(≤0.5‰)retreat to the sea apparently,which is beneficial to the water intake.

关 键 词：咸潮入侵 水幕 盐水楔 上溯距离 磨刀门水道 珠江口 

分 类 号：P731.12[天文地球—海洋科学]