基于水龄抑制蓝藻水华的供水水库取水方案优选  

Optimization of reservoir cycling water scheme based on water age to reduce algal bloom risk

作　　者：杨金艳[1] 徐勇[1] 周杰[2] 吴时强[2] YANG Jinyan;XU Yong;ZHOU Jie;WU Shiqiang(Suzhou Sub Bureau,Jiangsu Province Hydrology and Water Resources Investigation Bureau,Suzhou 215129,China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing Hydraulic Research Institute,Nanjing 210029,China)

机构地区：[1]江苏省水文水资源勘测局苏州分局,江苏苏州215129 [2]南京水利科学研究院水文水资源与水利工程科学国家重点实验室,江苏南京210029

出　　处：《水利水运工程学报》2020年第2期85-90,共6页Hydro-Science and Engineering

基　　金：水体污染控制与治理专项(2017ZX07203);江苏省水利科技项目(2018006);苏州市水利科技项目(2018001);国家自然科学基金资助项目(51479121,51479120)。

摘　　要：水体交换年龄称为水龄。水龄长是水库富营养导致蓝藻水华的重要因子。水龄也是环境水体混合过程分析中最佳的示踪指标,可描述水团的混合和更新、污染物的混合和消解等,故常用于研究湖库水体被外源水置换的能力。采用基于染色模拟的水龄模拟方法,改进了EFDC模型,以优选太仓二水厂供水水库取水泵房位置为例,建立了三维数学模型,模拟了不同布置方案对供水水库环流结构和水龄的影响,从而优化供水水库的水龄分布,抑制蓝藻水华。由于水库的氮磷营养盐输入量、水深、气温等自然条件难以控制,通过优化取水泵房位置可以改变水库环流特性,改善水库水体水龄分布,减少水龄、抑制蓝藻生长,从而降低水库富营养化的风险。Water age is the time for water replaced by that from outside.Water age plays an important role in algal bloom in reservoirs and is taken as an ideal tracer which can describe water mixing rate and process.It can yield very effective diagnoses,for example the characterization of the mixing and renewal of water masses,of the fate and mixing of contaminants.In the research,an age simulation method based on dyeing simulation was developed to improve EFDC model.Taking Taicang Second Water Plant reservoir pump house location optimization as an example,reservoir circulating currents and water age were modeled to reduce the water age in order to reduce algal bloom risk.Since the air temperature,water depth and nitrogen and phosphor input are hard to control,to optimize the water age and the cycling currents of reservoir by water intake pump house location optimization is one of the most useful ways to control the risk of algal bloom in reservoir by changing growth inhibition.

关 键 词：水库 富营养化 水龄 数值模拟 环流 风生流 

分 类 号：TV131[水利工程—水力学及河流动力学]