Vibrating object sound field within a closed water area

1996 ◽  
Vol 100 (4) ◽  
pp. 2836-2836
Author(s):  
E. I. Oboznenko ◽  
I. L. Oboznenko
Keyword(s):  
Sound Field ◽  
Water Area ◽  
Closed Water

Modeling of wave processes in closed water areas of shallow water areas

2021 ◽  
pp. 30-35
Author(s):  
Eugene Istomin ◽  
Valerii Mikheev ◽  
Yaroslav Petrov ◽  
Irma Martyn
Keyword(s):  
Water Area ◽  
Navier Stokes ◽  
Coastal Protection ◽  
Wave Processes ◽  
Color Palette ◽  
Continuity Equations ◽  
Port Area ◽  
Wave Heights ◽  
Closed Water ◽  
Hydrostatic Model

The article presents the developed non-stationary two-dimensional hydrostatic model of wave propagation in the water area of the port of the Bay of Five Hunters, protected by a coastal protection structure in the form of a jetty. The tasks of the work included the development of a model based on the Navier-Stokes and continuity equations and a long-range assessment of the possible impact of the wave situation on marine objects in the port area. At present, the provision of hydrometeorological predictive information is one of the most important factors in the effective operation of port waters. The results are presented graphically using a geographic information system, where different wave heights and maximum wave amplitudes are displayed using a color palette. The consistency of the obtained results is shown, and refraction, diffraction, and interference are noted for the incoming wavefront.

scholarly journals THE EFFECT OF PHOSPHORUS IN THE FINE-GRAINED SOIL ON THE EUTROPHICATION OF CLOSED WATER AREA

2005 ◽  
pp. 113-123
Author(s):  
Masahiro TEZUKA ◽  
Youichi SATOU ◽  
Michimasa NAKAMURA
Keyword(s):  
Water Area ◽  
Fine Grained ◽  
Fine Grained Soil ◽  
Closed Water

scholarly journals A STUDY ON TSUNAMI WAVE OSCILLATION AND ICE BREAK-UP CHARACTERISTICS IN A SEMI-CLOSED WATER AREA IN COLD REGION

2013 ◽  
Vol 69 (2) ◽  
pp. I_455-I_460
Author(s):  
Takaaki ABE ◽  
Yasuhiro YOSHIKAWA ◽  
Yoshishige SATOH ◽  
Akashi ITOH
Keyword(s):  
Tsunami Wave ◽  
Water Area ◽  
Cold Region ◽  
Wave Oscillation ◽  
Closed Water ◽  
Break Up

Opening of the closed water area and consequent changes of 228Ra/226Ra activity ratios in coastal lagoon Nakaumi, southwest Japan

2013 ◽  
Vol 81 ◽  
pp. 310-314 ◽  
Author(s):  
Ritsuo Nomura ◽  
Kosaku Nakamura ◽  
Koji Seto ◽  
Mutsuo Inoue ◽  
Hisaki Kofuji
Keyword(s):  
Coastal Lagoon ◽  
Water Area ◽  
Southwest Japan ◽  
226Ra Activity ◽  
Activity Ratios ◽  
Closed Water

scholarly journals Rasio Jumlah Mikroplastik dan Plankton di Kawasan Perairan Teluk Benoa, Bali

2021 ◽  
Vol 4 (2) ◽  
pp. 8
Author(s):  
Felixita Abigael Raintung ◽  
I Gede Hendrawan ◽  
Widiastuti Widiastuti
Keyword(s):  
Food Chain ◽  
Water Area ◽  
Marine Organisms ◽  
Plastic Waste ◽  
Food Sources ◽  
Total Abundance ◽  
Small Particles ◽  
Closed Water ◽  
Main Producer ◽  
Boat Speed

Plastic waste will degrade in the water and will break down into small particles called microplastics. Microplastics have a shape similar to food sources for marine organisms such as plankton, where if these microplastics are accidentally ingested by marine organisms it will enter the food chain and end up in humans through bioaccumulation and biomagnification. Plankton are divided into two types, namely phytoplankton as the main water producer and zooplankton as the second energy level that connects major producers with consumers at a higher level of food. This research was conducted to determine the type and ratio of the amount of microplastic and plankton as a source of food for marine organisms. This research was conducted in the waters of Benoa Bay, which is a semi-closed water area and has a variety of activities and there are also two large rivers that can contribute to pollution waste in the waters of Benoa Bay, this can lead to competition between the amount of plastic and plankton as the main producer in food chain. This research was conducted from February to July 2020 and sample analysis was carried out at the Marine Science Laboratory, Faculty of Marine and Fisheries Sciences, Udayana University. Sampling is done by pulling the trawl horizontally with a distance of 500 meters and a constant boat speed of 5 km/hour. The composition of the types of microplastics found were film, fragment, foam and fiber. The highest composition of phytoplankton comes from the Bacillariophyceae class, while the highest composition of zooplankton comes from the Malacostraca class. The average total abundance of microplastics is 1.69 particles/m3, while the average total abundance of plankton is 2851 Ind/m3 and a ratio of 1:1687. This result shows that until now the abundance of plankton is still much greater than the abundance of microplastics in the waters. However, considering the high amount of plastic use from household and tourism activities, it can also increase the inclusion of plastic waste that will enter the ocean.

scholarly journals Network model of underwater complex project for closed water area monitoring

2019 ◽  
Vol 2(475) ◽  
pp. 37-44
Author(s):  
Heorhii V. Babkin ◽  
Pavlo V. Maidaniuk
Keyword(s):  
Network Model ◽  
Water Area ◽  
Closed Water ◽  
Complex Project ◽  
Area Monitoring

A Facility Composed by Oyster Shell Filters for Purifying Contaminated Water in Closed Water Area

2008 ◽  
Author(s):  
S. Okamoto ◽  
M. Kuroiwa ◽  
Y. Matsubara ◽  
Y. Oshimura ◽  
K. Nagase
Keyword(s):  
Oyster Shell ◽  
Water Area ◽  
Contaminated Water ◽  
Closed Water
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