scholarly journals Tidal, wave, current and sediment flow patterns in wet season in the estuary of Porong River Sidoarjo, Indonesia

2018 ◽  
Vol 177 ◽  
pp. 01016
Author(s):  
A. Kisnarti Engki ◽  
Dj. Prasita Viv
Keyword(s):  
Flow Patterns ◽  
Current Data ◽  
Tidal Wave ◽  
Physical Oceanography ◽  
Sediment Thickness ◽  
Wet Season ◽  
The West ◽  
Tidal Current Velocity ◽  
Tidal Data ◽  
Sediment Flow

The objectives of this research are to analyze characteristics of physical oceanography, such as : tides, waves, currents, and discharges at Muara Kali Porong. This research also discuss sediment flow patterns and morphology in around the Estuary of Porong River. Tidal data were used as correction to the depth. The calculation to determine the tidal current velocity and wind data along with current data are used for simulation model. Sedimentation process with a simulation of 15 days in the West Season occured in the Northeast of Lusi Island with sediment thickness ranged from 1.6 to 2.6 m.

Observations on the Larval Diapause of the Pink Bollworm, Platyedra gossypiella, Saund.

1940 ◽  
Vol 30 (4) ◽  
pp. 475-481 ◽  
Author(s):  
F. A. Squire
Keyword(s):  
West Indies ◽  
Dry Season ◽  
Pink Bollworm ◽  
Wet Season ◽  
The West ◽  
Long Cycle ◽  
Larval Diapause ◽  
The World

As cotton crops in many parts of the world end either with the onset of winter or of the dry season, it is natural that the larval diapause which becomes more and more conspicuous as the crop ripens should have come to be regarded as an instance of either hibernation or aestivation; yet in the West Indies where the following observations were made, there is no winter, nor does the ripe boll phase of the crop necessarily fall in the dry season. The latter moreover is not one of complete drought but rather dry only by comparison. Indeed in some islands, such as Montserrat and St. Kitts, the crop is harvested in the wet season. Yet long-cycle or resting larvae are regularly found in all of these islands.

scholarly journals KONDISI OSEANOGRAFI DI SELAT MATAK KABUPATEN KEPULAUAN ANAMBAS MELALUI MODEL HIDRODINAMIKA

2018 ◽  
Vol 7 (2) ◽  
Author(s):  
Agung Riyadi ◽  
Nusa Idaman Said ◽  
Matih Santos
Keyword(s):  
South China Sea ◽  
Flow Velocity ◽  
South China ◽  
High Tide ◽  
Maximum Flow ◽  
Flow Patterns ◽  
The South China Sea ◽  
The South ◽  
The West ◽  
China Sea

This paper describes some of the general condition of the oceanographic parameters in the Strait Matak, Anambas Archipelago. The data flow is obtained by direct measurement by using a current meter types RCM-7. Simulation models using Mike 21. Mike flow pattern is divided into two seasons, namely west season (January) and the east season (August) and flow patterns ahead of the tide when the season is generally moving west to wards the south, it demonstrates the role of strong tidal influence the movement of waterin the study area. Flow velocity in the strait just before the tide on the west season reaches 1m/s.  Flow patterns at high tide on the west season looks still moving toward sthe south. The maximum flow velocity in the strait when the tide reaches 0.32 m/s, while the average speed in the area of the model is 0.12 m/s. Low tide towards the current pattern is still moving towards the south, it reinforces the notion that in addition to tidal windsare also very significant role in moving the flow, in this case that the current is moving toward the south. Flow velocity just before low tide reaches 0.85 m/s. Flow patterns at low tide shows the differences in the three previous conditions, the current in the strait to move out to the north toward the South China Sea. In condition slow tide, the tida lmore dominantly than the wind, this proved to even though the wind toward the south, the currents inthestraitis moving toward snorth along the tidal flow leading to the South China Sea. Flow velocity is quite varied location of modeling; flow velocity at low tide reaches 0.5m/s, with the average 0.15 m/s. Keywords: current and direction, wind, tide, model.

GEOPHYSICAL INVESTIGATIONS IN THE AREA OF THE PERTH BASIN, WESTERN AUSTRALIA

Geophysics ◽  
1965 ◽  
Vol 30 (6) ◽  
pp. 1026-1052 ◽  
Author(s):  
L. V. Hawkins ◽  
J. F. Hennion ◽  
J. E. Nafe ◽  
R. F. Thyer
Keyword(s):  
Continental Shelf ◽  
Western Australia ◽  
Structural Control ◽  
Seismic Profile ◽  
Sediment Thickness ◽  
The West ◽  
Western Margin ◽  
Eastern Margin ◽  
Geophysical Investigations ◽  
Southward Extension

Marine geophysical investigations in the area of the Perth Basin lead to proposed changes in the structural control of the basin and of the structure within the basin. The main north‐south graben structure appears to be crossed by a series of major faults which trend roughly north‐northwest. A broadening of the basin to a width of just over 100 km (65 miles) to the west in the area between Perth and Harvey, which was earlier indicated by aeromagnetic results, appears to be produced by two such faults: The southern fault does not cross the graben but merges with it in the form of the Dunsborough Fault; the proposed northern fault crosses the graben to produce a break in continuity of the Darling Fault which marks the eastern margin of the basin. The northern fault appears to have caused a division of the main sedimentation axis of the Perth Basin into two near parallel axes within the widened section of the basin. The Dandaragan Trough which forms the eastern axis now appears to terminate at the Darling Fault between Pinjarra and Harvey. The western axis continues to the southeast into the Bunbury Trough. This suggests the presence of a basement and anticlinal ridge which may produce favourable traps for oil or gas within the basin. The western margin of the basin appears to be formed by an eastward‐tilted basement with associated faulting which, in places, assumes major proportions. A tentative estimate of sediment thickness of about 5.7 km (18,600 ft) is obtained from a seismic profile near the axis of sedimentation on the extension of the Bunbury Trough. This figure is our preferred interpretation, but it would have to be reduced to about 3.5 km should a 5‐km/sec layer turn out to be basement. The southward extension of the Darling Fault onto the narrow continental shelf appears to be observed with a throw of two km to the south of Pt. D’Entrecasteau.

Doldrums

2018 ◽  
pp. 160-186
Author(s):  
Deirdre Coleman
Keyword(s):  
West Indies ◽  
Rice Cultivation ◽  
Wet Season ◽  
Middle Passage ◽  
The West ◽  
Slave Ships

Smeathman returns to the Bananas where, instead of collecting, he cultivates a large provision garden for the slave ships. His chief staples were Palma Christi, pepper, and Guinea rice but rice cultivation was James Cleveland’s preserve. Cleveland also objected to Smeathman’s attempts to intensify the women’s methods of growing and harvesting the rice. In the end Cleveland’s cattle destroy Smeathman’s garden. Broken in health, and dreading the oncoming wet season, Smeathman joins a fully slaved and leaky ship bound for the West Indies. As a passenger unconnected to the trade, Smeathman’s experience of the middle passage offers new perspectives and insights.

Water quality simulation of sewage impacts on the west coast of Mumbai, India

2010 ◽  
Vol 62 (2) ◽  
pp. 279-287 ◽  
Author(s):  
R. Vijay ◽  
P. J. Khobragade ◽  
R. A. Sohony
Keyword(s):  
Water Quality ◽  
West Coast ◽  
Current Data ◽  
The West ◽  
Water Quality Simulation ◽  
Hydrodynamic Behaviour ◽  
Treated Effluent ◽  
Treatment Facilities ◽  
The Impact

Most coastal cities use the ocean as a site of waste disposal where pollutant loading degrades the quality of coastal waters. Presently, the west coast of Mumbai receives partially treated effluent from wastewater treatment facilities through ocean outfalls and discharges into creeks as well as wastewater/sewage from various open drains and nallahs which affect the water quality of creek and coastal water. Therefore, the objective of this paper is to simulate and assess the hydrodynamic behaviour and water quality due to impact of sewage and wastewater discharges from the west coast of Mumbai. Hydrodynamics and water quality were simulated based on present conditions and validated by using measured tide, current data and observed DO, BOD and FC. Observed and simulated results indicated non compliance to standards in Malad, Mahim creeks and the impact zones of ocean outfalls. The developed model could be used for generating various conditions of hydrodynamics and water quality considering the improvement in wastewater collection systems, treatment levels and proper disposal for proper planning and management of creeks and coastal environment.

3. Measurement and prediction

2019 ◽  
pp. 34-49
Author(s):  
David George Bowers ◽  
Emyr Martyn Roberts
Keyword(s):  
Harmonic Analysis ◽  
Standard Method ◽  
Curve Fitting ◽  
Great Accuracy ◽  
Horizontal Flow ◽  
Physical Oceanography ◽  
Success Story ◽  
Fitting Procedure ◽  
Tidal Data ◽  
Tidal Streams

‘Measurement and prediction’ outlines the ways in which tides and tidal currents can be measured, and considers the standard method of analysing tidal data using a curve-fitting procedure known as harmonic analysis. Tides, unusually for natural events, can be forecast with great accuracy for years in advance. The ability to do this and make people safer at sea is probably the greatest practical success story of the science of physical oceanography. There are two aspects of the problem to be considered: the rise and fall of the level of the sea, which we shall call the tide; and the horizontal flow of the water, called tidal streams or currents.

An Historical Sketch of Physical Oceanography in Canada

1976 ◽  
Vol 33 (10) ◽  
pp. 2155-2167
Author(s):  
Neil J. Campbell
Keyword(s):  
West Coast ◽  
Inland Waters ◽  
Physical Oceanography ◽  
The West ◽  
Ocean Sciences ◽  
History Of ◽  
The 1960S ◽  
Under Construction ◽  
Historical Sketch

The history of Canadian oceanography is outlined through the contributions of individual scientists and the organization or programs they were associated with from 1890 to the early 1970s. The period up to 1960 reflects not only the scientific and personal efforts of H. B. Hachey, J. P. Tully, W. M. Cameron, and G. L. Pickard, but also their work in establishing oceanography as a science in Canada. The organizational developments which took place in the 1960s and their culmination in the building of the Bedford Institute of Oceanography, the Canada Centre for Inland Waters, and the Institute of Ocean Sciences now under construction on the west coast are described.

scholarly journals Flow of the Brunt Ice Shelf, Antarctica, Derived from Landsat Images, 1974–85

1986 ◽  
Vol 32 (111) ◽  
pp. 252-254 ◽  
Author(s):  
D.A. Simmons
Keyword(s):  
Satellite Images ◽  
Flow Patterns ◽  
Ice Shelf ◽  
Landsat Images ◽  
The West ◽  
Ice Stream

AbstractSatellite images recorded in 1973, 1974, and 1985 of the Brunt Ice Shelf are compared. There are sufficient identifiable features moving with the ice shelf to show flow patterns over an area of ~10 000 km2. Velocities vary from 500 m a−1in the west, near the Dawson-Lambton Ice Stream, to 1300 m a−1in the east, within the Stancomb-Wills Ice Stream.

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