MORPHOLOGICAL EFFECTOF SUCTION DYNAMICSINDUCED BY TIDAL OSCILLATION ON MINAMIGATA FLAT, YAMAGUCHI BAY

2019 ◽  
Author(s):  
HAJIME SHIROZU ◽  
KOICHI YAMAMOTO ◽  
`KOJI ASAI
Keyword(s):  
Tidal Oscillation

Visualization of Tidal Oscillation in the Taiwan Strait

2004 ◽  
Author(s):  
JUANG Wen-Jye ◽  
LIN Ming-Chung ◽  
CHIANG Chung-Chiuan
Keyword(s):  
Taiwan Strait ◽  
Tidal Oscillation ◽  
The Taiwan Strait

scholarly journals The tidal oscillation in an elliptic basin of variable depth-II

1936 ◽  
Vol 155 (884) ◽  
pp. 12-32 ◽  
Author(s):  
George Ridsdale Goldsbrough
Keyword(s):  
Infinite Series ◽  
Elliptic Cylinder ◽  
Long Waves ◽  
Analogous Problem ◽  
Algebraic Polynomials ◽  
Variable Depth ◽  
Finite Sets ◽  
Tidal Oscillation ◽  
The Subject ◽  
Arithmetical Calculation

The problem of the long waves in an elliptic lake with a paraboloidal law of depth was solved in a previous paper.* It appeared that the solutions could be expressed in terms of certain algebraic polynomials, from whose general properties the character of the motions could be readily derived. The subject of the present paper is the more important problem of the same basin subjected to rotation. The analogous problem of a rotating elliptic lake of uniform depth has been solved by Goldstein who used infinite series of elliptic cylinder functions. The law of depth used in the present paper, however, enables the solutions to be expressed in terms of finite sets of polynomials. The earlier modes can be completely determined without recourse to long arithmetical calculation and the interpretation of the analysis is easier. In the course of the work many properties of the polynomial are investigated.

MODELLING THE DISPERSION OF PRODUCED WATER DISCHARGES

1998 ◽  
Vol 38 (1) ◽  
pp. 681 ◽  
Author(s):  
B.A. King ◽  
F.A. McAllister
Keyword(s):  
Produced Water ◽  
Current Strength ◽  
Ecological Impacts ◽  
Worst Case ◽  
Water Currents ◽  
Model Predictions ◽  
Dispersion Patterns ◽  
Tidal Oscillation ◽  
Petroleum Platforms ◽  
Made In

The ability of two state-of-the-art dispersion models (MUDMAP and the OOC model) to predict the fate of produced formation water (PFW) discharged by offshore petroleum platforms was examined. This was achieved by comparing model predictions with measurements made in the field. The models predicted peak concentrations of tracer PFW constituents (benzene and toluene) to typically within a factor of 2 and location to within 200 metres of the field observations. The models showed that water currents actively transport PFW plumes. Therefore, plume position is largely governed by local tide and wind conditions. Alteration in current strength over the tidal cycle was also shown to cause significant variation in plume concentration. Further, tidal oscillation may cause discharged PFW to pass more than once through a given area ('second dosing'). Once validated, these models can be used to greatly improve estimation of the potential ecological impacts of PFW plumes. This is achieved by using these models to investigate the range of potential PFW dispersion patterns possible for a region around the platform. Collectively, these simulations provide measures of best case and worst case scenarios which can be used for understanding potential ecological impacts. Further, the models can readily estimate the influence of changing discharge practices, such as: altering pipe width and/or depth, improving oil reduction prior to release, increasing discharge volumes, etc. Such features are essential for decision support to platform managers in their efforts to minimise the environmental impacts of offshore platform operations.

Tidal oscillation of sediment between a river and a bay: a conceptual model

2004 ◽  
Vol 60 (1) ◽  
pp. 81-90 ◽  
Author(s):  
Neil K Ganju ◽  
David H Schoellhamer ◽  
John C Warner ◽  
Michael F Barad ◽  
S.Geoffrey Schladow
Keyword(s):  
Conceptual Model ◽  
Tidal Oscillation

scholarly journals VI. The analysis of tidal observations

1928 ◽  
Vol 227 (647-658) ◽  
pp. 223-279 ◽  
Keyword(s):  
Shallow Water ◽  
Sea Level ◽  
Great Increase ◽  
A Priori ◽  
Relative Importance ◽  
Higher Harmonics ◽  
Methods Of Analysis ◽  
Tidal Oscillation

The Tidal Institute was founded in the year 1919 and researches on tidal problems have since been continuously carried out. It was early shown that certain methods of analysis were incomplete and that the harmonic constituents taken into account do not fully represent the tidal oscillation. Special attention was called to the great increase required in the number of higher harmonics (“overtides” and “compound tides”) needed to represent tidal oscillations in shallow water. An investigation on the variations of “constants” obtained from yearly batches of observations provided additional evidence concerning the defects of analysis, and it was shown that the constants for important constituents are considerably perturbed by contributions from other constituents. In the year 1921 was published a very thorough expansion of the tide-generating potential, and many new constituents were indicated as being worthy of attention. Meteorological perturbations of sea-level and tides have also been studied, but much yet remains to be done, and such investigations require exact and complete methods of analysis. A tidal record may be assumed to consist of three parts:— (1) Oscillations of known periods and whose relative importance is known; (2) Oscillations whose periods are not known a priori, though exact periods may be deduced from considerations of causes, if such become known; (3) Oscillations of no persistent periodicity or amplitude and which may be regarded as sources of “casual errors" such as may be attributable to meteorological variations.

Responsiveness of the human airway in vitro during deep inspiration and tidal oscillation

2011 ◽  
Vol 110 (6) ◽  
pp. 1510-1518 ◽  
Author(s):  
Peter B. Noble ◽  
Robyn L. Jones ◽  
Elangovan Thaya Needi ◽  
Alvenia Cairncross ◽  
Howard W. Mitchell ◽  
...  
Keyword(s):  
Airflow Obstruction ◽  
Mechanical Stretch ◽  
Airway Responsiveness ◽  
Organ Bath ◽  
Deep Inspiration ◽  
Airway Narrowing ◽  
Tidal Oscillation ◽  
Human Airways ◽  
Static Conditions

In healthy individuals, deep inspiration produces bronchodilation and reduced airway responsiveness, which may be a response of the airway wall to mechanical stretch. The aim of this study was to examine the in vitro response of isolated human airways to the dynamic mechanical stretch associated with normal breathing. Human bronchial segments ( n = 6) were acquired from patients without airflow obstruction undergoing lung resection for pulmonary neoplasms. The side branches were ligated and the airways were mounted in an organ bath chamber. Airway narrowing to cumulative concentrations of acetylcholine (3 × 10−6 M to 3 × 10−3 M) was measured under static conditions and in the presence of “tidal” oscillations with intermittent “deep inspiration.” Respiratory maneuvers were simulated by varying transmural pressure using a motor-controlled syringe pump (tidal 5 to 10 cmH2O at 0.25 Hz, deep inspiration 5 to 30 cmH2O). Airway narrowing was determined from decreases in lumen volume. Tidal oscillation had no effect on airway responses to acetylcholine which was similar to those under static conditions. Deep inspiration in tidally oscillating, acetylcholine-contracted airways produced potent, transient (<1 min) bronchodilation, ranging from full reversal in airway narrowing at low acetylcholine concentrations to ∼50% reversal at the highest concentration. This resulted in a temporary reduction in maximal airway response ( P < 0.001), without a change in sensitivity to acetylcholine. Our findings are that the mechanical stretch of human airways produced by physiological transmural pressures generated during deep inspiration produces bronchodilation and a transient reduction in airway responsiveness, which can explain the beneficial effects of deep inspiration in bronchial provocation testing in vivo.

A mathematical model of a river—shallow sea system used to investigate tide, surge and their interaction in the Thames—southern North Sea region

1974 ◽  
Vol 275 (1255) ◽  
pp. 567-609 ◽  
Keyword(s):  
Mathematical Model ◽  
Sea Level ◽  
North Sea ◽  
Southern Bight ◽  
The North ◽  
Open Sea ◽  
The North Sea ◽  
Good Potential ◽  
Tidal Oscillation ◽  
The One

A mathematical model is used to reproduce tidal and surge motion in the Thames Estuary and the Southern Bight of the North Sea. The model is based on a numerical finite-difference solution of the nonlinear hydrodynamical equations representing motion in the area. The equations are nonlinear in so far as they include quadratic bottom friction and allow for time variations in the total depth of water; the inclusion of advective terms is limited to the river. Solution of the one-dimensional equations for the river and the two-dimensional equations for the sea takes place within a single computational array. The scheme for calculating motion in the sea is similar to that developed by Heaps (1969), and the scheme for the river was developed by Rossiter & Lennon (1965). Tidal and surge motion within the model are reproduced by specifying the initial tidal contours of the sea, the external influences of surge and tidal oscillation along the open sea boundaries, and wind stresses over the sea surface. Computations have been concerned with generating lunar tidal oscillations for the construction of an M2 co-tidal chart, and investigating the interaction between tides and surges, in this region of shallow waters. The investigation of interaction involved calculating the sea’s response to the separate and combined effects of tidal and meteorological forces, whence the effects of a tide on a surge were deduced, possibly for the first time at offshore locations. Computed interaction phenomena for the period of a severe storm surge, 15 to 17 February 1962, were found to accord with the results of Proudman (19550, b, J957) and Rossiter (1961). Agreement between computed sea-level disturbances and actually recorded disturbances for this surge period revealed that the model has good potential for simulating sea level disturbances which occur in nature.

I. On an apparatus for facilitating the reduction of tidal observations

1893 ◽  
Vol 52 (315-320) ◽  
pp. 345-389 ◽  
Keyword(s):  
Harmonic Waves ◽  
Tidal Oscillation ◽  
Length Of The Day

The tidal oscillation of the ocean may be represented as the sum of a number of simple harmonic waves which go through their periods approximately once, twice, thrice, four times in a mean solar day. But these simple harmonic waves may be regarded as being rigorously diurnal, semi-diurnal, ter-diurnal, and so forth, if the length of the day referred to be adapted to suit the particular wave under con­sideration.

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