15 0 0 0 OA 道頓堀川の水質変動特性と水質管理についての調査解析
- 著者
- 入江 政安 西田 修三
- 出版者
- Japan Society of Civil Engineers
- 雑誌
- 水工学論文集 (ISSN:09167374)
- 巻号頁・発行日
- vol.51, pp.1129-1134, 2007 (Released:2010-08-25)
- 参考文献数
- 2
- 被引用文献数
- 4 1
A lot of rivers and channels which were cut for water traffic flow through the center of Osaka City. The Dotombori River flows along and across the city's main streets and the landmark of Osaka. However, it is polluted so that it is the target of urban renewal and some measures are carried out. The water quality of this river is controlled by two water gates because more polluted upstream water and saline seawater in which the concentration of dissolved oxygen is very low flow into the river. In the present paper field observation is conducted to clarify the characteristics of the water quality and asses the operation of the water gates in this tidal urban river. The operation is good for the maintenance of the water quality, but the oxygen-deficient seawater intrudes and spreads onto the river bottom and makes influence on the bottom sediment.
1 0 0 0 OA 硫化水素の発生・溶出に着目した水底質モデルによる貧酸素水塊の動態解析
- 著者
- 入江 政安 西田 修三 寺中 恭介 辻 陽平 平澤 充成 藤原 敏晴 中筋 みゆき
- 出版者
- Japan Society of Civil Engineers
- 雑誌
- 土木学会論文集B2(海岸工学) (ISSN:18842399)
- 巻号頁・発行日
- vol.66, no.1, pp.1066-1070, 2010 (Released:2010-11-09)
- 参考文献数
- 17
- 被引用文献数
- 3
A field survey and laboratory analyses of sediment quality in the eastern part of Osaka Bay are carried out to clarify their characteristics and influence on the dynamics of hypoxia. Nitrogen, phosphorus and sulfur cycling in the coastal water and sediment are modeled with a focus on the formation of hydrogen sulfide in hypertrophic sediment and its release to the bottom water. In the calculated results the oxygen consumption in the bottom water by the release of sulfide is much larger than the direct oxygen consumption by the sediment in the northern port of the bay. Without the release of sulfide, the hypoxic water area would be estimated to be limited in and near the port area of the head of the bay. The wide spreading of hypoxia in the eastern part of the bay would be contributed largely by the sulfide release.