Thermosolutal transport in reservoirs generated by release and leaching of salinity and nutrients from anaerobic bed
厌氧床释放和淋滤盐度和营养物而产生的水库热溶质输送
基本信息
- 批准号:10650505
- 负责人:
- 金额:$ 2.56万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:1998
- 资助国家:日本
- 起止时间:1998 至 1999
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In eutrophic reservoirs, high concentration of nutrients and ionic matters are released from the bed under badly anaerobic condition. Since the leaching process produces high salinity or heavy water mass on the bed, it gravitationally generates an inclined plume on the sloping bed and transport heat and mass to the bottom layer. This process may bring serious eutrophication of bottom water.In order to predict heat and mass flux due to the thermosolutal transport and device a countermeasure against this, the following were examined. (1)Focusing on heat and salinity balance in the anaerobic bottom water, a water quality measurement was performed in a eutrophic reservoir. (2)Release flux of salinity from the bed was examined in an experimental model in which the bed materials sampled from the reservoir were installed in a tank and filled with anaerobic water. (3)Using a micro-bubble aerator system, an in-situ experiment of water purification was carried out. (4)A model experiment and an a … More nalysis on the inclined plume were performed in order to investigate buoyancy and flow fields.The main findings are as follows. The thermosolutal convection is the main reason of making the reservoir bottom water to be extraordinary heavy and salty. Because of its very stable salinity stratification, the impounded water has never been overturned in the last many years. It makes the bottom water to be more seriously eutrophicated. It is the plume convection of warm water from the shallow layer to the bottom layer that is responsible for producing an inverse temperature stratification in the bottom layer. The heat and mass flux can be computed by the plume theory which was verified with the experimental data. The flux law was successfully applied for computing heat and salinity balance observed in the field survey. The micro-bubble aeration system was found to be very useful for promoting vertical mixing and aerating the bottom layer. After starting the aeration, the heavy and anaerobic bottom water mass was completely disappeared and the reservoir was fully overturned.The next step we should take is to develop a prediction tool of water quality by considering the thermosolutal convection process. We should also continue the water purification experiment for improving the system to be of user-convenience. Less
富营养化水库在恶劣的厌氧条件下,从河床中释放出高浓度的营养物和离子物质。由于浸出过程在床上产生高盐度或重水团,因此在倾斜的床上重力作用产生倾斜的羽流,并将热量和质量输送到底层。这一过程可能带来严重的底层水体富营养化。为了预测由热溶质输运引起的热量和质量通量,并提出相应的对策,本文研究了以下几个方面。(1)针对厌氧底水热盐平衡问题,对某富营养化水库进行了水质测量。(2)在实验模型中,将从储层取样的床料安装在一个水箱中并充满厌氧水,研究了床层的盐度释放通量。(3)采用微泡曝气系统,进行了现场净水实验。(4)对倾斜羽流进行了模型实验和进一步的分析,以研究其浮力和流场。主要研究结果如下:热溶质对流是造成储层底水异常重盐的主要原因。由于其非常稳定的盐度分层,在过去的许多年里,被蓄水的水从未被推翻过。它使底层水的富营养化更加严重。从浅层到底层的暖水羽流对流是在底层产生逆温度分层的原因。热通量和质量通量可以用羽流理论计算出来,并得到了实验数据的验证。将通量定律成功地应用于野外观测的热、盐平衡计算。发现微泡曝气系统对促进垂直混合和底层曝气非常有用。曝气启动后,重质厌氧底水完全消失,池体完全倾覆。下一步应考虑热溶质对流过程,开发水质预报工具。我们还应该继续进行净水实验,以改进系统,方便用户使用。少
项目成果
期刊论文数量(35)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
大成博文: "マイクロバブル発生技術と水環境蘇生"日本高専学会誌. 3-4. 12-20 (1998)
Hirofumi Taisei:“微气泡发生技术和水环境复苏”日本工业学院学报3-4(1998)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Michioku,K.: "Nutrient transport due to heat-salt convection in a eutrophic reservoir"Proc.28th Conf.IAHR. 28(SD-ROM). (1999)
Michioku,K.:“富营养化水库中热盐对流引起的养分输送”Proc.28th Conf.IAHR。
- DOI:
- 发表时间:
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- 影响因子:0
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道奥康治: "マイクロバブル・エアレータによる貯水池の水質浄化実験"水工学論文集. 44(印刷中). (1999)
Yasuharu Michio:“使用微泡曝气器的水库净化实验”水利工程杂志 44(出版中)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
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神田徹: "貯水池での水温計測に基づく内部波・自然対流の抽出" 水工学論文集. 43. 1049-1054 (1999)
Toru Kanda:“基于水库水温测量的内波和自然对流提取”《水利工程学报》43. 1049-1054 (1999)。
- DOI:
- 发表时间:
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- 影响因子:0
- 作者:
- 通讯作者:
Miyamoto,H., Kanda,T. and Iwami,S.: "Development of method for measuring suspended solid concentration by using image processing of luminance (in Japanese)"Proc. Construction Institute. Vol.40-A. 67-80 (1998)
宫本,H.,神田,T.
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MICHIOKU Kohji其他文献
MICHIOKU Kohji的其他文献
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Technology systematization for channel maintenance and restoration to invite self-rejuvenation of river ecosystem
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- 批准号:
26289164 - 财政年份:2014
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$ 2.56万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Hydro-planning study on optimizing riparian vegetation felling for preserving channel's conveyance capacity
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26630228 - 财政年份:2014
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$ 2.56万 - 项目类别:
Grant-in-Aid for Challenging Exploratory Research
Strategic study on ecohydraulic properties of overgrown vegetation on floodplain aiming at sustainable river management
漫滩杂草丛生的生态水力学特性战略研究,旨在实现河流可持续管理
- 批准号:
23360212 - 财政年份:2011
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$ 2.56万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Analysis on symbiosis of catchment sphere to nature and its application to regional restoration
流域与自然共生分析及其在区域恢复中的应用
- 批准号:
22651059 - 财政年份:2010
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$ 2.56万 - 项目类别:
Grant-in-Aid for Challenging Exploratory Research
STRATEGY FOR OPTIMUM MANAGEMENT OF WATER PURIFICATION SYSTEM WITH CONSIDERATION OF TOTAL ENVIRONMENTAL LOAD AND COST-BENEFTT
考虑总环境负荷和成本效益的净水系统优化管理策略
- 批准号:
18360237 - 财政年份:2006
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$ 2.56万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Design of rubble mound river structures from a view point of hydrospheric environment
水圈环境视角下的堆石丘河流结构设计
- 批准号:
14350268 - 财政年份:2002
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$ 2.56万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Study on hydro-environmental properties of rubble weir constructed of coarse rokcs
粗石砌筑的碎石堰水环境特性研究
- 批准号:
12650513 - 财政年份:2000
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$ 2.56万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
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 - 财政年份:2000
- 资助金额:
$ 2.56万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Experimental and Analytical Study on Water Quality Transfer Induced by Wind Shear Stress in Stratified Water Areas
分层水域风切应力引起水质转移的实验与分析研究
- 批准号:
06650566 - 财政年份:1994
- 资助金额:
$ 2.56万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
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