Environmental Restoration of Coastal Habitats in the Inner Part of Osaka Bay. Quality of Seawater, Bottom Sediment and Benthic Fauna in the Vicinity of a Planned Tidal Flat at the Port of Sakai-Semboku, and the Response of Marbled Sole, Pleuronectes yokohamae to Hypoxia.

1998 ◽  
Vol 7 (5) ◽  
pp. 293-303 ◽  
Author(s):  
Susumu Yamochi ◽  
Hiroyuki Ariyama ◽  
Masaki Sano
Keyword(s):  
Bottom Sediment ◽  
Tidal Flat ◽  
Benthic Fauna ◽  
Environmental Restoration ◽  
Coastal Habitats ◽  
Osaka Bay

RELEASE OF NUTRIENTS FROM BOTTOM SEDIMENTS IN OSAKA BAY, JAPAN IN 2015

2017 ◽  
Author(s):  
Yukio Komai ◽  
Yukio Komai ◽  
Mana Sakata ◽  
Mana Sakata ◽  
Masaki Nakajima ◽  
...  
Keyword(s):  
Bottom Sediment ◽  
Bottom Sediments ◽  
Sea Water ◽  
Industrial Effluents ◽  
Ammonium Nitrogen ◽  
Water Release ◽  
Osaka Bay ◽  
The Core ◽  
Similar Range ◽  
Sea Area

Osaka Bay is the most polluted enclosed sea area, in which is located the eastern part of the Seto Inland Sea, Japan. There are four kinds of sources on loadings of nutrients to Osaka Bay, which are land including rivers and industrial effluents beside coast, ocean sea water, release from bottom sediment to sea water, and wet and dry deposition from air. The pollutant loadings inflowing from the land to Osaka Bay have been cut by various policies since 1970’s. The concentrations of nutrients in the inner part of Osaka Bay have showed an obvious decreasing tendency. However, the water quality in offshore sea has not satisfied the environmental standard on nutrients. We investigated the amount of nutrients released from bottom sediments. The core samples were taken at two stations in the inner part of Osaka Bay once a month from February to November, 2015. The core incubation experiment in laboratory was conducted for 24 hours according to Tada et.al. The concentrations of ammonium nitrogen (NH4-N) and phosphate phosphorus (PO4-P) were measured by an automatic analyzer. The flux showed similar range with the values investigated in 1986. The results suggested that the flux of nutrients from bottom sediments in the inner part of Osaka Bay has not decreased during summer season at least since 1985. Therefore, the contribution of release from bottom sediment on the nutrients budget would relatively become larger in inner part of Osaka Bay.

scholarly journals SEASONAL BIOLOGICAL WATER QUALITY ASSESSMENT OF RIVER KSHIPRA USING BENTHIC MACRO-INVERTEBRATES

2015 ◽  
Vol 3 (9SE) ◽  
pp. 1-7
Author(s):  
Akhand Archna ◽  
Shrivastava Sharad ◽  
Akhand Pratibha
Keyword(s):  
Water Quality ◽  
River Water ◽  
Benthic Fauna ◽  
Water Quality Assessment ◽  
Seasonal Abundance ◽  
Dominant Group ◽  
Biological Water ◽  
Water Quality Status ◽  
Biological Water Quality

The water quality of River Kshipra in stretch of 195 km was studied for water quality status using benthic macro invertebrates for all three seasons’ monsoon, winter and summer. The River water quality is subject to severe domestic and industrial pollution at compete stretch of River. In the present investigation a total of 13 Orders of macrobenthic fauna i.e. Ephemeroptera, Trichoptera, Placoptera, Coleoptera, Hemiptera, Odonata, Crustacea, Diptera, Pulmonata, Operculata, Pulmonata, Oligochaeta and Hirudinea belong to 3 Phylum’s Arthropoda, Mollusca and Annelida were reported. Arthropoda was the most dominant group in all seasons. On seasonal comparison of benthic fauna is observe that abundance were decreasing order were, Winter > Monsoon > summer. To monitor the water quality samples from two years (2010-12) from different stations were collected monthly. The works highlighted the condition of the River water in various seasons with respect of the seasonal abundance of the benthic macro-invertebrates organisms mentioned above.

scholarly journals Distributions of Ulvaohnoi and Currents at the Artificial Tidal Flat of Hannan Second District in Osaka Bay

2012 ◽  
Vol 68 (2) ◽  
pp. I_1186-I_1190
Author(s):  
Daiki SAKAI ◽  
Toru ENDO ◽  
Takaaki SHIGEMATSU ◽  
Susumu YAMOCHI
Keyword(s):  
Tidal Flat ◽  
Osaka Bay

scholarly journals Ordovician deep dolomite reservoirs in the intracratonic Ordos Basin, China: Depositional model and Diagenetic evolution

2018 ◽  
Vol 36 (4) ◽  
pp. 850-871 ◽  
Author(s):  
Anqing Chen ◽  
Shenglin Xu ◽  
Shuai Yang ◽  
Hongde Chen ◽  
Zhongtang Su ◽  
...  
Keyword(s):  
Tidal Flat ◽  
Depositional Environment ◽  
Ordos Basin ◽  
Depositional Model ◽  
Facies Associations ◽  
Intracratonic Basins ◽  
Sea Level Fluctuation ◽  
Reservoir Type ◽  
Diagenetic Evolution

Recent natural gas discoveries indicate that non-karstification-dominated reservoirs exist in the intracratonic Ordos Basin. This study examines the sedimentological and geochemical characteristics needed to clarify the depositional model and diagenetic evolution process of this newly discovered reservoir type. The depositional environment of the dolomite reservoir can be characterized as a tidal flat that grew from the Central Paleo-uplift to the eastern depression by cyclic progradation on an epeiric platform. A tidal flat sequence can extend laterally as a progradational wedge in each cycle of sea level fluctuation. The sheet-shaped peritidal shoal facies associations patched on the wedge represent potential dolomite reservoirs and can be recognized by the presence of doloarenite that has been altered into a vaguely relict grained-texture by diagenesis. Although continuing destructive diagenesis has led to reservoir densification, burial dolomitization and burial dissolution with facies selectivity have tended to occur in peritidal shoal facies associations, thus improving the quality of the dolomite reservoirs. These models provide new insights for targeting deep dolomite hydrocarbon reservoirs in intracratonic basins.

scholarly journals An Assessment of Water and Sediment Quality of River in India with Special Reference to Pesticide Contamination, a Case Study

2018 ◽  
Vol 7 (3.8) ◽  
pp. 97
Author(s):  
Divya A.H ◽  
P A. Soloman
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Bottom Sediment ◽  
Sediment Quality ◽  
Temporal Distribution ◽  
Water Quality Monitoring ◽  
Human Beings ◽  
Water And Sediment Quality

Drinking water quality has become a serious issue in many countries due to the scarcity of fresh water resources. Water quality monitoring is the first step for the management and conservation of aquatic system. The contamination of OrganoChlorine Pesticides (OCPs) is very harmful for the environment and human beings. The presence of OCPs in surface water and in the bottom sediment in the Chalakudy River was investigated to evaluate the pollution load and distribution level of OCP seasonally over a period of 3 years from January 2013 to December 2015. Surface water sample and bottom sediment were collected from nine different sites (upstream, midstream and downstream) and analyzed for their profile of important physicochemical parameters and for persistence of OCP. To know the present trends in the river clearly ,temporal  distribution  and spatial distribution of OCPs and other parameters are studied based on three season(winter, summer, and monsoon).Obtained trend in each  year  were compared  through sampling and analysis.   

Effects of Sediment Dredging on Water Quality of Meiliang Lake

2011 ◽  
Vol 90-93 ◽  
pp. 2619-2623
Author(s):  
Fu Long Chen ◽  
Jing Wang
Keyword(s):  
Water Quality ◽  
Numerical Model ◽  
Bottom Sediment ◽  
Lake Water ◽  
Lake Water Quality ◽  
Sediment Dredging ◽  
Tai Lake ◽  
Before And After

Meiliang Lake is located at north of Tai lake, it is one of the most important part of Tai Lake. Water quality of Meiliang Lake is being worse because the TP, TN and COD is released from the bottom sediment. So th goverment is decided to dredg the bottom sediment to improve the water quality. This paper used WASP5 numerical model to simulate the water quality of Meiliang Lake before and after the sediment dredging. The results show that sediment dredging is useful for improving the water quality of Meiliang Lake.

Quality of samples retrieved from great depth and its influence on consolidation properties

2002 ◽  
Vol 39 (6) ◽  
pp. 1288-1301 ◽  
Author(s):  
Hiroyuki Tanaka ◽  
Fusao Ritoh ◽  
Naoki Omukai
Keyword(s):  
Void Ratio ◽  
Volumetric Strain ◽  
Great Depth ◽  
Sampling Depth ◽  
Osaka Bay ◽  
Oedometer Test ◽  
Preconsolidation Pressure ◽  
Constant Rate ◽  
Sample Disturbance

Pleistocene sediments deposited in Osaka Bay have been extensively investigated to depths of up to 400 m. Consolidation properties, especially preconsolidation pressure, are somewhat scattered with depth. The quality of samples retrieved from great depths has been evaluated based on the indices calculated from the volumetric strain or the void ratio changes in the recompression process. The study reveals that these indices do not simply increase with an increase in sampling depth. The potential for sample disturbance during sample setting in the constant rate of strain (CRS) oedometer was also investigated. These tests have revealed that the preconsolidation pressure, as measured in the laboratory, is not influenced significantly by swelling. In addition, preconsolidation pressures indicate that the sediments are slightly overconsolidated, with a departure from normally consolidated behaviour that could be explained by cementation.Key words: sampling, preconsolidation pressure, sample disturbance, oedometer test, Pleistocene clay, great depth.

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