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Studies on the Mechanism of Occurrence and the Diffusion of Oxygenless Water Occurring by Organic Bottom Deposits, in a Fish Culture Sea Area

养鱼海域有机底沉积物产生无氧水的发生机制和扩散研究

基本信息

批准号：
04660256
负责人：
KAINO Osamu
金额：
$ 1.34万
依托单位：
Ehime 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：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

We made it clear about mechanism of appearance and diffusion of oxygenless water, in the fish culture sea inlet area.We conducted a spot investigation of the water quality and tidal current in the sea area, experimented on the oxygen demand and the specific characteristic of the bottom deposits, by the temperature change of it and also searched for the relationship between them.That is to say,1) We considered the relationship between bottom deposits Eh and oxygen demand in each response temperature by experimenting on the oxygen demand of the bottom deposits. Also we elucidated on the oxidation speed and the rate of climb of Eh.2) We explained the relationship between the reduction of convergance value (lowest value) and the temperature of bottom deposits under oxygenless conditions, and also elucidated on the dropping speed of the Eh.3) We clarified the relationship between Eh of the bottom deposits and the temparature occurring by the different organic pollution.4) We explained the relationship between the lowest Eh value of bottom deposits and TN.5) We elucidated on the relationship between the bottom sea DO and the Eh of bottom deposits in the fish culture sea area.6) We clarified the relationship between Eh of the bottom deposits in the fish culture area.7) We investigated the tidal current speed under the fish culture facilities, considered the difference of the vertical distributions by each tidal range, and the relationship between the condition of the Eh and tidal current.8) We measured the vertical distributions of the tidal current at the mouth of the inlet. And we investigated the distibution difference of the tidal current in the fish culture area.In conclusion, we have proposed a simulation model for measuring Eh of the bottom deposits and DO density of the sea water by using the temperature, DO and tidal・current speed as parameters.

明确了无氧水体在养鱼入海口区出现和扩散的机理，对该海域的水质和潮流进行了实地调查，通过温度变化试验了该海域的需氧量和底质特性，并探讨了它们之间的关系，即：1）通过对底泥需氧量的实验研究，考察了各响应温度下底泥Eh与需氧量的关系。2）解释了转化率降低与反应速率的关系（最低值）和在无氧条件下底部沉积物的温度，3）阐明了不同有机污染物引起的底泥Eh与温度的关系阐明了底质最低Eh值与TN的关系。5）阐明了养殖海区底质Eh与底质DO的关系。6）阐明了养殖海区底质Eh与DO的关系。7）调查了养殖设施下的潮流速度，考虑了各潮差的垂向分布差异，以及Eh条件与潮流的关系。8）在河口测得潮流垂向分布。最后，提出了以温度、溶解氧和潮流速度为参数，测量底质Eh和海水溶解氧浓度的模拟模型。