scholarly journals Relationship between Internal Oscillation and Movement of Anoxic Water in a Connected Brackish Water Region-Lake Nakaumi and the Ohashi River.

1998 ◽  
Vol 59 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Tomoyasu FUJII
Keyword(s):  
Brackish Water ◽  
Internal Oscillation ◽  
Anoxic Water ◽  
Lake Nakaumi ◽  
Water Region

A Survey of the Island Fisheries of the Territory of New Guinea and Papua

1951 ◽  
Vol 2 (2) ◽  
pp. 226 ◽  
Author(s):  
WH Schuster
Keyword(s):  
Brackish Water ◽  
Sea Water ◽  
New Guinea ◽  
Fish Stocks ◽  
Protein Requirements ◽  
River Deltas ◽  
Water Region ◽  
Large Populations ◽  
Productivity Potential ◽  
Lowland Lakes

A survey of two weeks' duration was made of part of the territory of New Guinea and Papua to study the possibility of extending the freshwater and brackish water fisheries. The brackish water region possesses a higher productivity potential than inland waters, owing to the introduction of the normal nutrient components of sea water with the fertile sedimented mud from the rivers, together with organic matter from the rain forests. Ecologically, and in regard to type of vegetation found, the limited coastal flats, the river deltas, and the extensive mangrove swamps are Indonesian in character. The estuarine region has a fauna rich in density, there being numerous fish species and large populations of prawns, while shrimps and oysters are also plentiful. In the freshwater areas two types of river exist — one shallow, subject to flooding and shifting of sands, and few fish; the second deep, with fertile mud, and fairly productive of fish. The lowland lakes, with fertile colloidal mud, were not examined in detail, but should provide a considerable fishery potential. There is considerable scope for fish cultural operations, e.g. in constructed ponds. Before a sound extension of the fisheries can be planned it will be necessary to obtain adequate basic scientific knowledge of the density and composition of the flora and fauna, including the food of the fish stocks, and of the characteristics of the environment. I t appears that a fishery more than adequate to supply the protein requirements of the coastal population could therefore be developed, by relatitive simple means, in the brackish waters and in the great lowland rivers.

EFFECTS OF ORGANIC CONTENT ON WATER CONTENT OF BOTTOM SEDIMENT IN EUTOROPHIC COASTAL AND BRACKISH WATER REGION

2018 ◽  
Vol 74 (7) ◽  
pp. III_43-III_51
Author(s):  
Keita HATTORI ◽  
Yoshiyuki NAKAMURA ◽  
Tetsunori INOUE ◽  
Hiroto HIGA ◽  
Ryoji NAITO ◽  
...  
Keyword(s):  
Bottom Sediment ◽  
Water Content ◽  
Brackish Water ◽  
Organic Content ◽  
Water Region

scholarly journals Flow and Anoxic Water Mass Behavior Accompanied with the Change in Meteorological Conditions in Lake Nakaumi.

1999 ◽  
pp. 61-79 ◽  
Author(s):  
Shoji FUKUOKA ◽  
Takeshi KUROKAWA ◽  
Tadashi HIBINO ◽  
Atsushi SUZUKI ◽  
Takeshi NAKAMURA ◽  
...  
Keyword(s):  
Water Mass ◽  
Meteorological Conditions ◽  
Anoxic Water ◽  
Mass Behavior ◽  
Lake Nakaumi

scholarly journals Deposition and Transportation Characterisrics of Organic Matter in Brackish Water Region

2010 ◽  
Vol 66 (1) ◽  
pp. 1091-1095
Author(s):  
Masami ABE ◽  
Katsuaki KOMAI ◽  
Masataka IMAGAWA ◽  
Tadashi HIBINO
Keyword(s):  
Organic Matter ◽  
Brackish Water ◽  
Water Region

Investigational Studies on Quantity of Salinity in Netravati River Estuary Sand-Coastal Karnataka

2018 ◽  
Vol 6 (6) ◽  
pp. 46
Author(s):  
Raveesha P ◽  
K. E. Prakash ◽  
B. T. Suresh Babu
Keyword(s):  
Brackish Water ◽  
Sea Water ◽  
Salt Water ◽  
Construction Material ◽  
Salt Content ◽  
River Estuary ◽  
Sand Sample ◽  
River Sand ◽  
Natural Aggregates

The salt water mixes with fresh water and forms brackish water. The brackish water contains some quantity of salt, but not equal to sea water. Salinity determines the geographic distribution of the number of marshes found in estuary. Hence salinity is a very important environmental factor in estuary system. Sand is one major natural aggregate, required in construction industry mainly for the manufacture of concrete. The availability of good river sand is reduced due to salinity. The quality of sand available from estuarine regions is adversely affected due to this reason. It is the responsibility of engineers to check the quality of sand and its strength parameters before using it for any construction purpose. Presence of salt content in natural aggregates or manufactured aggregates is the cause for corrosion in steel. In this study the amount of salinity present in estuary sand was determined. Three different methods were used to determine the salinity in different seasonal variations. The sand sample collected nearer to the sea was found to be high in salinity in all methods.  It can be concluded that care should be taken before we use estuary sand as a construction material due to the presence of salinity.

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