滨海地下水库建设与利用方式对含水层水盐运移规律的影响  

Influences of coastal underground reservoir construction and utilization on saltwater and freshwater transport law in aquifers

作　　者：王宗志[1] 王宇[1] 王坤 白莹 WANG Zongzhi;WANG Yu;WANG Kun;BAI Ying(The National Key Laboratory of Water Disaster Prevention,Nanjing Hydraulic Research Institute,Nanjing 210029,China)

机构地区：[1]南京水利科学研究院水灾害防御全国重点实验室,江苏南京210029

出　　处：《水资源保护》2023年第4期69-78,共10页Water Resources Protection

基　　金：国家自然科学基金项目(U2240223);水利技术示范项目(SF-202210)。

摘　　要：为揭示地下水库建设与地下水开采方式对滨海含水层水盐运移规律的影响,建立了300 m×900 m×30 m的概念数值模型,并采用非承压含水层变密度流模拟方法,解析地下水库建设前后不同开采情景下的滨海含水层水盐运移规律。结果表明:地下水库建设可显著降低海水入侵范围与程度;地下水开采能在一定时间范围内加速地下水库残留海水入侵扩散程度,咸水入侵系数与开采规模、开采井与地下坝之间的距离成指数关系;合理布设开采井位置与开采规模,能有效降低地下水开采对库区水体咸化的负面影响。In order to reveal the impact of underground reservoir construction and extraction methods on the saltwater and freshwater transport law in coastal aquifers,a 300m×900m×30m conceptual numerical model was established.The variable density current simulation method of unconfined aquifer was used to analyze the saltwater and freshwater transport law in coastal aquifer under different extraction scenarios before and after the construction of underground dam.The results show that the construction of underground dam can significantly reduce the scope and degree of seawater intrusion.Groundwater extraction can accelerate the intrusion and diffusion of residual saltwater in underground reservoirs within a certain time range.The coefficient of saltwater intrusion is exponentially related to extraction scale and the distance between extraction wells and underground dams.Reasonable layout of the location and scale of extraction wells can effectively reduce the negative impact of groundwater extraction on water salinity in the reservoir area.

关 键 词：滨海含水层 海水入侵 地下水库 地下水开采方式 

分 类 号：TV213.9[水利工程—水文学及水资源]