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Research on Accumulation Mechanism of Freshwater Red Tide in a Dam Reservoir

坝库淡水赤潮累积机理研究

基本信息

批准号：
06680491
负责人：
SOMIYA Isao
金额：
$ 1.47万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06680491/
关键词：
fresh water red tide Peridinium dam reservoir accumulation mechanism head of lake phototaxis flow 抑制対策

项目摘要

I.The diurnal change of distribution patterns and standing crop of Peridinium were observed at the head of Shourenji Dam Reservoir in autumn. There were three distribution patterns ; (a) accumulating at the surface in the day time ; (b) dispersing to lower layr and stream in the night ; (c) dispersing lower layr near the plunging point. The standing crop of Peridinium increased at similar rate of growth day by day. Since organisms were transported by the counter flow, The biomass periodically varied at 24 hours cycle in a day. These results show that the red tide develops and dissipates in the balance of growth, import and export.II.Swimming velocity vectors of Peridinium were measured under various temperature and light intensity conditions. Analyzing obtained data sets, we constructed a mathematical model that predicted the vertical swimming velocity of Peridinium community. Furthermore, using the water tank and the mathematical model that assuming the head of a water reservoir, we examined the accumulation and dispersion processes of red tide. The mathematical model including the vertical swimming responses could simulate the diurnal change of biomass.III.We developed the mathematical model that simulate the accumulation mechanism of freshwater red tide. It predicts the import and export using the fluid dynamics model, the vertical distribution using the vertical swimming model, and the growth using the ecological model. This model successfully simulated the temporal and spatial distribution of Peridinium at the head of Shourenji Dam Reservoir. These results suggested that accumulation mechanism of freshwater red tide could be treat in the term of engineering.

1 .秋季在寿仁集水库水头观测了铀矿的分布格局和常备产量的日变化。有三种分布模式；(a)白天地面累积量；(b)夜间向低层和溪流扩散；(c)在落点附近分散的下层。常熟的Peridinium的产量每天都以同样的速度增长。由于生物是通过逆流运输的，因此生物量在一天内以24小时为周期周期性变化。结果表明，赤潮在生长、进口和出口的平衡中发展和消散。ii .在不同的温度和光强条件下，测量了Peridinium的游动速度矢量。通过分析所获得的数据集，我们建立了一个预测periidinium群落垂直游动速度的数学模型。在此基础上，利用水箱和假设水库水头的数学模型，研究了赤潮的积累和扩散过程。包含垂直游泳响应的数学模型可以模拟生物量的日变化。iii .建立了模拟淡水赤潮积累机制的数学模型。采用流体力学模型预测进出口，采用垂直游动模型预测垂直分布，采用生态模型预测生长。该模型成功地模拟了首人集水库水头处氚的时空分布。这些结果表明，淡水赤潮的形成机制可以从工程角度加以处理。