STUDY ON CHANGE IN WAVE CHARACTERISTICS OF MILD WAVE AND SWELL UNDER PRESENT AND FUTURE CLIMATES

The flood waves are characterized within the frame-work of loop (or hysteresis) of rating curves. The National Weather Service's Dam Break Flood Forecasting Model is used to generate the flood waves in the downstream valley of the Bargi dam located in Central India. The quantified hystereses, η, of non-dimensional rating curves are related with the corresponding flood wave characteristics, viz., speed of travel, wave number, phase difference, and attenuation. The analysis has led to the development of an exact relationship between η and phase difference. Using the concept of wave zoning, the better performance of the hysteresis based criteria compared with the available criteria is verified using Convex and Muskingum-Cunge routing in the wave zones. η limits are specified for the applicability of these simplified routing models. Furthermore, the envisaged applications of the based analysis are introduced.

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Multimodel Ensemble Projections of Wave Climate in the Western North Pacific Using CMIP6 Marine Surface Winds

Journal of Marine Science and Engineering ◽

10.3390/jmse9080835 ◽

2021 ◽

Vol 9 (8) ◽

pp. 835

Author(s):

Mochamad Riam Badriana ◽

Han Soo Lee

Keyword(s):

North Pacific ◽

General Circulation ◽

Western North Pacific ◽

Wave Climate ◽

Coastal Development ◽

Climate Projections ◽

Surface Winds ◽

Time Step ◽

Wave Characteristics ◽

Marine Surface

For decades, the western North Pacific (WNP) has been commonly indicated as a region with high vulnerability to oceanic and atmospheric hazards. This phenomenon can be observed through general circulation model (GCM) output from the Coupled Model Intercomparison Project (CMIP). The CMIP consists of a collection of ensemble data as well as marine surface winds for the projection of the wave climate. Wave climate projections based on the CMIP dataset are necessary for ocean studies, marine forecasts, and coastal development over the WNP region. Numerous studies with earlier phases of CMIP are abundant, but studies using CMIP6 as the recent dataset for wave projection is still limited. Thus, in this study, wave climate projections with WAVEWATCH III are conducted to investigate how wave characteristics in the WNP will have changed in 2050 and 2100 compared to those in 2000 with atmospheric forcings from CMIP6 marine surface winds. The wave model runs with a 0.5° × 0.5° spatial resolution in spherical coordinates and a 10-min time step. A total of eight GCMs from the CMIP6 dataset are used for the marine surface winds modelled over 3 hours for 2050 and 2100. The simulated average wave characteristics for 2000 are validated with the ERA5 Reanalysis wave data showing good consistency. The wave characteristics in 2050 and 2100 show that significant decreases in wave height, a clockwise shift in wave direction, and the mean wave period becomes shorter relative to those in 2000.

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Nonlocal Effective Electromagnetic Wave Characteristics of Composite Media: Beyond the Quasistatic Regime

Physical Review X ◽

10.1103/physrevx.11.021002 ◽

2021 ◽

Vol 11 (2) ◽

Author(s):

Salvatore Torquato ◽

Jaeuk Kim

Keyword(s):

Electromagnetic Wave ◽

Composite Media ◽

Wave Characteristics ◽

Quasistatic Regime

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Millimeter Wave Characteristics of Copper Sintered Transmission Line

2020 IEEE 9th Global Conference on Consumer Electronics (GCCE) ◽

10.1109/gcce50665.2020.9292040 ◽

2020 ◽

Author(s):

Hiroki Aoki ◽

Naoki Takano ◽

Mitsuru Shinagawa ◽

Atsushi Miki ◽

Hironori Imamura ◽

...

Keyword(s):

Transmission Line ◽

Millimeter Wave ◽

Wave Characteristics

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Axial guided wave characteristics in functionally graded one-dimensional hexagonal piezoelectric quasi-crystal cylinders

Mathematics and Mechanics of Solids ◽

10.1177/10812865211013458 ◽

2021 ◽

pp. 108128652110134

Author(s):

B. Zhang ◽

X.H. Wang ◽

L. Elmaimouni ◽

J.G. Yu ◽

X.M. Zhang

Keyword(s):

Coupling Effect ◽

Energy Conversion Efficiency ◽

Guided Wave ◽

Functionally Graded ◽

Phonon Modes ◽

One Dimensional ◽

Longitudinal Modes ◽

Wave Characteristics ◽

Piezoelectric Effects ◽

Hollow Cylinders

In one-dimensional hexagonal piezoelectric quasi-crystals, there exist the phonon–phason, electro–phonon, and electro–phason couplings. Therefore, the phonon–phason coupling and piezoelectric effects on axial guided wave characteristics in one-dimensional hexagonal functionally graded piezoelectric quasi-crystal (FGPQC) cylinders are investigated by utilizing the Legendre polynomial series method. The dispersion curves and cut-off frequencies are illustrated. Wave characteristics in three hollow cylinders with different quasi-periodic directions are comparatively studied. Some new wave phenomena are revealed: the phonon–phason coupling and piezoelectric effects on the longitudinal and torsional phonon modes ( N = 0) vary as the quasi-periodic direction changes; the phonon–phason coupling effect on flexural–torsional modes in the r-, z-FGPQC hollow cylinders, and on flexural–longitudinal modes in ϑ-FGPQC hollow cylinders increases as N increases. The corresponding results obtained in this work lay the theoretical foundation for the design and manufacture of piezoelectric transducers with high resolution and energy-conversion efficiency.

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