scholarly journals The Intra-Tidal Characteristics of Tidal Front and Their Spring–Neap Tidal and Seasonal Variations in Bungo Channel, Japan

2021 ◽  
Vol 13 (9) ◽  
pp. 1840
Author(s):  
Menghong Dong ◽  
Xinyu Guo
Keyword(s):  
Tidal Current ◽  
Strong Dependence ◽  
Current Phase ◽  
Tidal Front ◽  
Bungo Channel ◽  
Gradient Based ◽  
Flood Current ◽  
Tidal Characteristics ◽  
Front Detection ◽  
Tidal Variations

The intra-tidal variations of a tidal front in Bungo Channel, Japan and their dependence on the spring–neap tidal cycle and month were analyzed utilizing high-resolution (~2 km) hourly sea surface temperature (SST) data obtained from a Himawari-8 geostationary satellite from April 2016 to August 2020. A gradient-based front detection method was utilized to define the position and intensity of the front. Similar to previous ship-based studies, SST data were utilized to identify tidal fronts between a well-mixed strait and its surrounding stratified area. The hourly SST data confirmed the theoretical intra-tidal movement of the tidal front, which is mainly controlled by tidal current advection. Notably, the intensity of the front increases during the ebb current phase, which carries the front toward the stratified area, but decreases during the flood current phase that drives the front in the opposite direction. Due to a strong dependence on tidal currents, the intra-tidal variations appear in a fortnight cycle, and the fortnightly variations of the front are dependent on the month in which the background stratification and residual current changes occur. Additionally, tidal current convergence and divergence are posited to cause tidal front intensification and weakening.

scholarly journals TIDE AND TIDAL CURRENT IN THE BALI STRAIT, INDONESIA

2015 ◽  
Vol 36 (2) ◽  
pp. 25-36 ◽  
Author(s):  
Dessy Berlianty ◽  
Tetsuo Yanagi
Keyword(s):  
Tidal Current ◽  
Ecological Model ◽  
Current Model ◽  
Spring Tide ◽  
Residual Flow ◽  
Tidal Front ◽  
Shelf Seas ◽  
Shallow Area ◽  
Tidal Constituents ◽  
Tide And Tidal Current

Tide and tidal current model of the Bali Strait in Indonesia is produced by using a Coupled Hydrodynamical-Ecological Model for Regional and Shelf Seas (COHERENS). With its resolutions in the horizontal (500meters) and the vertical (4layers), the model well reproduces the four major tidal constituents, namely M2, S2, K1, and O1 tides, and their currents. Furthermore the model is used to investigate the tide-induced residual flow and tidal front in the Bali Strait. As a results, the tide-induced residual flow in the Bali Strait during the spring tide on May 16th in 2010 can be attributed to the variation of the strength of two eddies. The first one is the clockwise circulation in the shallow area at the wide part of the strait, while the second one is the small clockwise circulation in the south of the narrow strait. On the other hand, as suggestion from Simpson and Hunter (1974), the tidal front is determined by the value of log(H/U3) (where is the water depth in meters and the amplitude oftidal current amplitude in ms-1). The front detected by the image of sea surface temperature distribution from the satellite corresponds with the contour log(H/U3) of 6.5.

Effects of tidal current phase at the junction of two straits

2002 ◽  
Vol 22 (11-13) ◽  
pp. 1629-1642 ◽  
Author(s):  
John Warner ◽  
David Schoellhamer ◽  
Jon Burau ◽  
Geoffrey Schladow
Keyword(s):  
Tidal Current ◽  
Current Phase

scholarly journals Estimations of tidal characteristics and aquifer parameters via tide-induced head changes in coastal observation wells

2010 ◽  
Vol 7 (6) ◽  
pp. 9155-9171
Author(s):  
Y.-J. Chen ◽  
G.-Y. Chen ◽  
H.-D. Yeh ◽  
D.-S. Jeng
Keyword(s):  
Coastal Aquifer ◽  
Present Method ◽  
Estimation Procedure ◽  
Data Sets ◽  
Phase Lag ◽  
Aquifer Parameters ◽  
Well Water Level ◽  
Tidal Characteristics ◽  
Tidal Variations ◽  
Parameter Values

Abstract. The groundwater fluctuations affected by tidal variations at an observation well in a coastal aquifer can be used to determine the tidal characteristics and aquifer parameters without conducting an aquifer test. In this study, a method, comprised of Jeng et al.'s solution (2005) and simulated annealing (SA) algorithm, is developed to determine the coastal aquifer parameters (namely, hydraulic diffusivity, beach slope, and aquifer thickness) as well as the tidal characteristics (namely, bichromatic-tide amplitudes, bichromatic-tide wave frequencies, and tidal phase lag) from the analysis of the tide-induced well-water-level (WWL) data. Two data sets, i.e., synthetic WWL data generated from Jeng et al.'s solution (2005) with assumed parameter values and field data obtained from Barrenjoey beach in Australia, are analyzed. The estimated parameter values obtained from analyzing synthetic WWL data by the present method show good agreements with the previously assumed parameter values. The parameter estimation procedure may however fail in the case of a large shallow-water parameter which in fact violates the constraint on the use of Jeng et al.'s solution (2005). In the analysis of field WWL data, the results indicate that the estimated aquifer parameters from the present method are significantly different from those given in Nielsen (1990). Inspecting the observed WWL data and the WWL data predicted from Jeng et al.'s solution (2005) reveals that the present method may provide better estimations for the aquifer parameters than those given in Nielsen (1990).

Analysis on the Tidal Current Characteristics of the Caofeidian Sea Area

2011 ◽  
Vol 250-253 ◽  
pp. 3050-3054
Author(s):  
Cui Ping Kuang ◽  
Kai Hua Yao ◽  
Jie Gu ◽  
Huang Jing ◽  
Xu Liu
Keyword(s):  
Deep Water ◽  
Tidal Current ◽  
Reverse Flow ◽  
Eastern Coast ◽  
Bohai Bay ◽  
Field Observations ◽  
Current Characteristics ◽  
Flood Current ◽  
Under Construction ◽  
Sea Area

Caofeidian harbor is a large size deep-water harbor currently under construction in the Bohai Bay, the eastern coast of north China. The construction began in 2003. The characteristics of tides and tidal currents in the Caofeidian area are analyzed with field data from comprehensive field observations from 2008 to 2010. The field observations and analysis show that the tide is the irregular semi-diurnal and tidal current is characterized as a type of reverse flow with moving west during flood tides and east during ebb tides. In general, the flood current is slightly stronger than the ebb current, and the strongest tidal current appears in the Caofeidian foreland, which is the predominant driving force to maintain the deep water depth.

scholarly journals Estimations of tidal characteristics and aquifer parameters via tide-induced head changes in coastal observation wells

2011 ◽  
Vol 15 (5) ◽  
pp. 1473-1482 ◽  
Author(s):  
Y.-J. Chen ◽  
G.-Y. Chen ◽  
H.-D. Yeh ◽  
D.-S. Jeng
Keyword(s):  
Coastal Aquifer ◽  
Present Method ◽  
Estimation Procedure ◽  
Phase Lag ◽  
Aquifer Parameters ◽  
Well Water Level ◽  
Well Data ◽  
Tidal Characteristics ◽  
Tidal Variations ◽  
Parameter Values

Abstract. The groundwater fluctuations due to tidal variations at an observation well in a coastal aquifer can be used to determine the tidal characteristics and aquifer parameters without conducting an aquifer test. In this study, a method, comprised of Jeng et al.'s solution (2005) and simulated annealing (SA) algorithm, is developed to determine the coastal aquifer parameters (hydraulic diffusivity, beach slope, and aquifer thickness) as well as the tidal characteristics (bichromatic-tide amplitudes, bichromatic-tide wave frequencies, and tidal phase lag) from the analysis of the tide-induced well-water-level (WWL) data. The synthetic WWL data generated from Jeng et al.'s solution (2005) with assumed parameter values and field data obtained from Barrenjoey beach, Australia, are analyzed. The estimated parameter values obtained from analyzing synthetic WWL data by the present method show good agreements with the previously assumed parameter values. The parameter estimation procedure may however fail in the case of a large shallow water parameter which in fact violates the constraint on the use of Jeng et al.'s solution (2005). In the analysis of field WWL data, the results indicate that the aquifer parameters estimated from the present method with single or multiple well data are significantly different from those given in Nielsen (1990). Inspecting the observed WWL data and the WWL data predicted from Jeng et al.'s solution (2005) reveals that the present method may provide better estimations for the aquifer parameters than those given in Nielsen (1990).

CBED analysis of impurity distributions in AlN

1990 ◽  
Vol 48 (4) ◽  
pp. 214-215
Author(s):  
Daniel Callahan ◽  
G. Thomas
Keyword(s):  
Aluminum Nitride ◽  
Bulk Material ◽  
Strong Dependence ◽  
Lattice Parameter ◽  
Promising Technique ◽  
Nitride Ceramics ◽  
Surface Phases ◽  
Convergent Beam ◽  
Oxygen Impurities

Oxygen impurities may significantly influence the properties of nitride ceramics with a strong dependence on the microstructural distribution of the impurity. For example, amorphous oxygen-rich grain boundary phases are well-known to cause high-temperature mechanical strength degradation in silicon nitride whereas solutionized oxygen is known to decrease the thermal conductivity of aluminum nitride. Microanalytical characterization of these impurities by spectral methods in the AEM is complicated by reactions which form oxygen-rich surface phases not representative of the bulk material. Furthermore, the impurity concentrations found in higher quality ceramics may be too low to measure by EDS or PEELS. Consequently an alternate method for the characterization of impurities in these ceramics has been investigated.Convergent beam electron diffraction (CBED) is a promising technique for the study of impurity distributions in aluminum nitride ceramics. Oxygen is known to enter into stoichiometric solutions with AIN with a consequent decrease in lattice parameter.

What Does Rent Give to Federal Budget (on the Russia's Budget Dependence upon "Oil Dollars")

2004 ◽  
pp. 51-69 ◽  
Author(s):  
E. Sharipova ◽  
I. Tcherkashin
Keyword(s):  
Oil And Gas ◽  
Strong Dependence ◽  
Oil Prices ◽  
Federal Budget ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Resource Rent ◽  
Tax Legislation ◽  
Russian Economy ◽  
The Government

Federal tax revenues from the main sectors of the Russian economy after the 1998 crisis are examined in the article. Authors present the structure of revenues from these sectors by main taxes for 1999-2003 and prospects for 2004. Emphasis is given to an increasing dependence of budget on revenues from oil and gas industries. The share of proceeds from these sectors has reached 1/3 of total federal revenues. To explain this fact world oil prices dynamics and changes in tax legislation in Russia are considered. Empirical results show strong dependence of budget revenues on oil prices. The analysis of changes in tax legislation in oil and gas industry shows that the government has managed to redistribute resource rent in favor of the state.

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