A quasi-persistent hypoxic water mass in an equatorial coastal sea, Jakarta Bay, Indonesia

Fresh water is in short supply in the Yugoslav coastal area and especially so on the islands. The use of fresh water for regional water supply systems is comparatively expensive and it is used for purposes which do not demand high quality water. An analysis of the water consumption in tourist areas suggests that the peak consumption could be lowered by 23 to 37,5 percent, thus saving about 32,2 percent of the total annual water mass. This equals about 70 percent of the total one-day flow of the Yugoslav rivers into the Adriatic. Recycled water can be used for agricultural purposes and for aquaculture, which makes it possible to use the nutrients from waste water and to lower the quantity of waste matter in the coastal sea.

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CHARACTERISTICS OF HYPOXIC WATER MASS IN ISAHAYA BAY

Journal of Japan Society of Civil Engineers Ser B1 (Hydraulic Engineering) ◽

10.2208/jscejhe.70.i_1207 ◽

2014 ◽

Vol 70 (4) ◽

pp. I_1207-I_1212 ◽

Cited By ~ 1

Author(s):

Ami ZAIZEN ◽

Hongyuan LI ◽

Yuji SUGIHARA ◽

Nobuhiro MATSUNAGA

Keyword(s):

Water Mass ◽

Isahaya Bay ◽

Hypoxic Water

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SPATIAL DISTRIBUTION OF HYPOXIC WATER MASS BASED ON A MONITORING CAMPAIGN OF BAY ENVIRONMENT AT TOKYO BAY, JAPAN.

Coastal Engineering Proceedings ◽

10.9753/icce.v32.management.51 ◽

2011 ◽

Vol 1 (32) ◽

pp. 51

Author(s):

Takehito Horie ◽

Keita Furukawa ◽

Tomonari Okada

Keyword(s):

Spatial Distribution ◽

Dissolved Oxygen ◽

Tidal Flat ◽

Water Mass ◽

River Estuary ◽

Tokyo Bay ◽

Monitoring Campaign ◽

Hypoxic Water ◽

Vertical Spacing ◽

Sea Area

In 2008, a monitoring campaign of bay environment had been done at Tokyo Bay, Japan. This campaign has been a part of implementation of the bay renaissance plan enacted since 2005. The data was collected by 46 institutions in 568 monitoring points in around 2nd July 2008. Dissolved oxygen, salinity and temperature were monitored in sea area basically from the surface to the bottom with 1.0 m vertical spacing at the monitoring points. We analyzed spatial distribution of hypoxic water mass based on this monitoring campaign data. Following results are obtained that 1) Measurement results showed that the bottom hypoxic water mass dominated in the head of Tokyo bay, while dissolved oxygen concentration was high condition in tidal flat and in shallow water, such as the Tama River estuary, Sanbanze tidal flat area and the Ara River estuary. 2) We proposed new parameters, such as CDZ and VDZ, which showed characteristic of spatial distribution of hypoxic water. The proposed parameters could be related to the temporal and spatial development of hypoxic water. Thus, these parameters will extend the interpretation of conservative bottom dissolved oxygen (DOB) data to understand the dynamics of hypoxic water.

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