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张雅卓, 宋芷萱, 姚 烨, 闫琳琳, 徐楚涵.局部降温对输水渠道水华抑制的影响分析水资源与水工程学报[J].,2024,35(2):130-138
局部降温对输水渠道水华抑制的影响分析
Influence of local cooling on bloom suppression in water diversion channels
  
DOI:10.11705/j.issn.1672-643X.2024.02.15
中文关键词:  输水渠道水华  局部降温  通冷风  叶绿素a  水温  数值模拟  南水北调中线工程
英文关键词:bloom in water diversion channel  local cooling  ventilation  chlorophyll a  water temperature  numerical simulation  The middle route of the South-to-North Water Diversion Project
基金项目:国家重点研发计划项目(2022YFB4200701);国家自然科学基金项目(52079087);河北省自然科学基金创新研究群体项目(E2020402074)
作者单位
张雅卓1, 宋芷萱1, 姚 烨1,2, 闫琳琳1, 徐楚涵1 (1.天津大学 水利工程智能建设与运维全国重点实验室 天津 300350 2.天津理工大学 海洋能源与智能建设研究院 天津 300384) 
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中文摘要:
      南水北调中线工程自通水以来,发挥着巨大的社会和经济效益,已成为京津地区的主力水源。中线工程输水的水质理化指标相对稳定,但局部渠段存在藻类异常增殖现象,有水华爆发的风险。针对出现的藻类异常增殖问题,在通冷风这一改变局部气象条件的工程措施基础上,建立了澎河—沙河渡槽段平面二维水动力和水质模型,研究了通风位置、通风温度和通风时长等因素对输水渠道水温和藻类的影响。研究表明:水温和叶绿素a<>/i浓度均与通风位置、通风温度和通风时长有关,通风温度越低、通风时长越长,平均水温和叶绿素a浓度下降幅度越大,平均水温最高可下降约2 ℃,叶绿素a浓度最大可降低约54.5%,且仅上游和全渠段通风均可有效降低水温和抑制藻类生长,仅下游通风对水温和藻类的影响较小。因此,采取局部降温的方式可以起到一定的降低叶绿素a浓度的作用,综合考虑藻类抑制效果和工程成本,在水华易爆发渠段的上游通冷风是行之有效的工程措施。
英文摘要:
      The middle route of South-to-North Water Diversion Project has been the main source of water supply for Beijing and Tianjin since its opening to the outside world, bringing massive social and economic benefits to the society. At present, the physical and chemical indices of water quality are relatively stable in the middle route project, with occasional abnormal algal proliferation in some channel sections, which may lead to algal blooms if left unattended. To address this problem, the engineering measure of local cooling ventilation, which changed the local meteorological conditions was adopted, and a two-dimensional hydrodynamic and water quality model was developed for the Penghe-Shahe aqueduct, and the effects of different ventilation locations, ventilation temperature and ventilation duration on water temperature and algae growth in water diversion channels were studied. The results show that both water temperature and chlorophyll a concentration are related to ventilation position, ventilation temperature and ventilation duration. The lower the ventilation temperature, the longer the ventilation duration, the greater the decline of the water temperature and chlorophyll a concentration, the water temperature can be reduced by about 2 ℃, and the concentration of chlorophyll a can be reduced by about 54.5% at most, both upstream only ventilation and whole channel section ventilation can lower the water temperature and inhibit the growth of algae, but downstream only ventilation has little effect on water temperature and algae growth. Therefore, local cooling can reduce the concentration of chlorophyll a to some extent, considering the algal inhibition effect and engineering cost, the engineering measure of local cooling ventilation in the upstream is recommended for the algal bloom-prone channel sections.
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