Countermeasure for prevention of reservoir eutrophication by controlling thermo-solutal convection

控制热溶质对流防治水库富营养化对策

• 批准号: 12555148
• 负责人: MICHIOKU Kohji
• 金额: $ 5.57万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555148/
• 关键词: Reservoir eutrophication; Akae Bloom; Aeration; Water purification; Micro-bubbles; Thermosolutal Convection; Internal Circulation; Hypolimnion; 水環境; 貯水池; 停滞水域; 現地観測

An in-situ experiment on hypolimnic aeration has been carried out in a eutrophic reservoir. Micro air bubbles were discharged into the anaerobic hypolimnion to supply oxygen and improve water quality. The system has been in operation since March in 1999. The aerator unit was so designed that the hypolimnic water is aerated without disturbing thermal stratification. At the beginning of the experiment, however, because of unsuitable design of nozzle structure, the aerator generated unexpectedly large bubbles and promoted vertical mixing. Although the hypolimnic water was aerated due to aerobic water entrained from the epilimnion, this was not the hypolimnic water aeration what we expected. The aerator structure was then modified to prevent macro-bubble generation and the hypolimnic water was successfully aerated without destratification. After all, in the course of the experiment the reservoir has experienced three different dissolved oxygen regimes, i.e. (1) no aeration, (2) aeration with vertical mixing, (3) aeration with little vertical mixing. The present study is to discuss how the dissolved oxygen affects hypolimnic water quality by comparing the field data from the three different DO regimes. The results provide useful information in designing an aeration system as a countermeasure against hypolimnic water eutrophication.

在富营养化的储层中已经进行了降雨曝气的原位实验。微气泡被排放到厌氧的低位症中，以供应氧气并改善水质。自1999年3月以来，该系统一直在运行。曝气单元的设计如此之多，以至于降压水被充气而不会干扰热分层。但是，在实验开始时，由于喷嘴结构的不合适设计，曝气器产生了出乎意料的大气泡并促进了垂直混合。尽管由于遗传中含有的有氧水而导致低颗粒的水被充气，但这并不是我们所期望的降压水充气。然后对曝气器结构进行修改以防止大泡产生，并在没有破坏的情况下成功充气了降压水。毕竟，在实验过程中，储层经历了三种不同的溶解氧气状态，即（1）无曝气，（2）带有垂直混合的曝气，（3）垂直混合的充气。本研究是讨论溶解的氧气如何通过比较三种不同的DO机制的现场数据来影响降临水质。该结果为设计曝气系统的设计提供了有用的信息，以此作为反对低磷水富营养化的对策。

项目成果

Michioku, K.: "PLUME GENERATED FROM A SLOPING BENTHIC LAYER OF CONSTANT BUOYANCY (in Japanese)"Annual J. Hydraulic Engineering. Vol. 45. 967-972 (2001)

Michioku, K.：“从恒定浮力的倾斜底栖层生成的羽流（日文）”年度水利工程杂志。

大成博文: "高専新時代における足場"論文集「高専教育」. 24. 447-452 (2001)

大成弘文：《新时代技术学院的脚手架》论文集《技术学院教育》24。447-452（2001）。

Michioku, K.: "RESEVOIR WATER PURIFICATION WITH USE OF MICRO-BUBBLES AND SYSTEM'S PERFORMANCE (in Japanese)"Annual J. Hydraulic Engineering. Vol. 45. 1201-1206 (2001)

Michioku, K.：“使用微气泡的水库水净化和系统性能（日语）”年度 J. 水利工程。

宮本仁志: "画像解析による水面変動・流速の同時計測法と開水路凹部流れへの適用"水工学論文集. 第45巻. 511-516 (2001)

Hitoshi Miyamoto：“利用图像分析同时测量水面波动和流速及其在明渠凹面流中的应用”，《水利工程学报》，第 45 卷，511-516（2001 年）。

松尾克美: "マイクロバブル技術によるダム貯水池の水質浄化法の開発"電力土木. No.288. 36-40 (2000)

松尾胜美：“利用微泡技术开发大坝水库的净水方法”电力土木工程第288. 36-40（2000）。