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The Experimental Studies on the prediction model for the decline in DO density of fish culture aria in a semi-closed bay

半封闭海湾养鱼场DO浓度下降预测模型的实验研究

基本信息

批准号：
09660260
负责人：
KAINO Osamu
金额：
$ 2.11万
依托单位：
Ehime University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09660260/
关键词：
ORP (oxidation reduction potential)fish culture area BOD first stage COD anoxic water DO water temperature bottom sediment 底泥の酸化海水の貧酸素化 DO濃度予測底層流速酸化還元電位 COD

项目摘要

In the fish culture area of a closed bay, organic sediment accumulates from left-over fish bait and fish droppings. The organic sediment has an important influence on the sea water quality. In particular, regarding the sea DO density, bottom sediment deterioration occurs through organic oxidation.This study clarifies the mechanism by which bottom sediment oxidation and deterioration of DO density occurs, This study, based on experiment we haveconducted over the past 11 years on the sediment ORB and oxidation, have yielded the following results.1) The total oxidation demand value of reduced bottom sediment is calculated by sediment ORB, p11, and water temperature.2) It is possible to separate the DOD value and first stage COD values from the total oxidation value of sediment by a method that corrects total oxidation data under 7mg/I DO condition and it is also possible to calibrate each value through sediment ORB.3) The oxidation depth of bottom sediment is about 9 mm in a fish culture area, and the sediment oxidation ratio is about 0.30 to total oxidation under accumulated conditions.4) It is possible to transform the oxidation demand value of bottom sediment under accumulated conditions through the ORB value.As we have demonstrated by these results the calculation program(ORP-model) for DO density variation was developed and the calculation value of the model was almost equal to the hydraulic experimental value of the closed circulating water way.

在封闭海湾养鱼区，残留的鱼饵和鱼粪会积聚有机沉积物。有机沉积物对海水水质有重要影响。特别是在海洋DO密度方面，海底沉积物的劣化是通过有机氧化发生的。本研究阐明了海底沉积物氧化和DO密度恶化发生的机制。本研究基于我们过去11年来对沉积物ORB和氧化进行的实验，得出了以下结果。1)通过沉积物ORB、p11和水温计算还原底泥的总氧化需求值。2)在7mg/I DO条件下，通过对总氧化数据的校正，可以将DOD值和第一期COD值从沉积物的总氧化值中分离出来，也可以通过沉积物的orb对各值进行校准。3)在养鱼区，底部沉积物的氧化深度约为9 mm，积累条件下沉积物的氧化比约为0.30。4)可以通过ORB值变换积累条件下底泥的氧化需求值。结果表明，开发了溶解氧密度变化的计算程序（orp模型），该模型的计算值与封闭循环水通道的水力实验值基本相等。