| 摘要: |
| 水龄长是水库富营养导致蓝藻水华的重要因子，也是环境水体混合过程分析中最佳的示踪指标。它可以产生非常有用的诊断，例如描述水团的混合和更新，污染物的混合和消解等，所以经常用来研究湖库水体被外源水置换的能力。本文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，减少水龄抑制蓝藻的生长，从而降低水库富营养化的风险。基于水龄的供水水库取水方案优选是一种新的设计思路，值得长江中下游供水水库抑制蓝藻的设计借鉴。 |
| 关键词: 水库 富营养化 水龄 数值模拟 环流 风生流 |
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| 基金项目:水体污染控制与治理专项（2017ZX07203），江苏省水利科技项目（2018006，2018001），国家自然科学基金（51479121，51479120） |
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| A study on reservoir cycling water scheme optimization based on water age to reduce algal bloom risk |
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Yang Jinyan1, Xu Yong1, Zhou Jie2, Wu Shiqiang2
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1.Jiangsu province hydrology and water resource investigation bureau Suzhou sub bureau;2.Nanjing Hydraulic Research Institute
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| Abstract: |
| Water age plays an important role on 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, as for example the characterization of the mixing and renewal of water masses, of the fate and mixing of contaminants.In this paper, an age simulation method based on dyeing simulation was developed to improve EFDC model. Taking Taicang Second Water Plant reservoir pump house loction optimization as an example, reservoir circulating currents and water age is modeled to reduce the water age in order to reduce algal bloom risk. Since the air temperature, water depth and nitrogen and phosphor input is hard to control, to optimize the water age and cycling currents of reservoir by water intake pump house location optimization is one of the most usefull way to control the risk of algal bloom in reservoir by changing growth inhibition. It is a new design guideline based on reducing water age and worth promoting to reduce algal bloom risk for most water supply reservoirs in middle and down stream of Yangtze river. |
| Key words: reservoir eutrophication water age numerical simulation circulating current wind driven currents |
