scholarly journals Numerical Study of Winter Shamal Wind Forcing on the Surface Current and Wave Field in Bushehr's Offshore Using MIKE21

2018 ◽  
Vol 2 (2) ◽  
pp. 57-65 ◽  
Author(s):  
Mohammad Pakhirehzan ◽  
Maryam Rahbani ◽  
Hossein Malakooti ◽  
◽  
◽  
...  
Keyword(s):  
Wave Field ◽  
Numerical Study ◽  
Surface Current ◽  
Wind Forcing ◽  
Shamal Wind

Sensitivity of HF radar-derived surface current self-organizing maps to various processing procedures and mesoscale wind forcing

2015 ◽  
Vol 20 (1) ◽  
pp. 115-131 ◽  
Author(s):  
Ivica Vilibić ◽  
Hrvoje Kalinić ◽  
Hrvoje Mihanović ◽  
Simone Cosoli ◽  
Martina Tudor ◽  
...  
Keyword(s):  
Surface Current ◽  
Hf Radar ◽  
Wind Forcing ◽  
Self Organizing Maps ◽  
Self Organizing

scholarly journals Dynamics of the Land–Sea Breeze System and the Surface Current Response in South-West Australia

2020 ◽  
Vol 8 (11) ◽  
pp. 931
Author(s):  
Syeda Rafiq ◽  
Charitha Pattiaratchi ◽  
Ivica Janeković
Keyword(s):  
Surface Current ◽  
Field Measurements ◽  
Sea Breeze ◽  
Wind Forcing ◽  
Current Response ◽  
Surface Currents ◽  
The South ◽  
Wind Speeds ◽  
North East ◽  
South West

The land–sea breeze (LSB) system, driven by the thermal contrast between the land and the adjacent ocean is a widely known atmospheric phenomenon, which occurs in coastal regions globally. South-west Australia experiences a persistent and one of the strongest LSB systems globally with maximum wind speeds associated with the LSB system often exceeding 15 ms−1. In this paper, using field measurements and numerical simulations, we examine: (1) the local winds associated with the land–sea breeze with an emphasis on the ocean; and, (2) the response of the surface currents to the diurnal wind forcing. The measurements indicated that the wind speeds decreased between midnight and 0400 and increased rapidly after 1100, reaching maxima >10 ms−1 around 1800) associated with the sea breeze and decreased to midnight. Wind directions were such that they were blowing from south-east (120°) in the morning and changed to almost southerly (~200°) in the afternoon. Decomposition of the wind record to the diurnal and synoptic components indicated that the diurnal component of winds (i.e., LSB) was oriented along the south-west to north-east axis. However, the stronger synoptic winds were from the south-east to south quadrant and in combination with the LSB, the winds consisted of a strong southerly component. We examined the evolution, horizontal extent, and propagation properties of sea breeze fronts for characteristic LSB cycles and the sea breeze cell propagating offshore and inland. The results indicated that the sea breeze cell was initiated in the morning in a small area, close to 33° S, 115.5° E, with a width of ~25 km and expanded onshore, offshore and alongshore. The sea breeze cell expanded faster (30 kmh−1) and farther (120 km) in the offshore direction than in the onshore direction (10 kmh−1 and 30–40 km). Winds during the LSB cycle followed a counterclockwise rotation that was also reflected in the surface currents. The winds and surface currents rotated anticlockwise with the surface currents responding almost instantaneously to changes in wind forcing but were modified by topography. The diurnal surface currents were enhanced due to the resonance between the LSB forcing and the inertial response.

scholarly journals On Evolution of Young Wind Waves in Time and Space

Atmosphere ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 562 ◽  
Author(s):  
Shemer
Keyword(s):  
Wave Field ◽  
Field Experiments ◽  
Wind Wave ◽  
Wind Waves ◽  
Wave Generation ◽  
Wind Forcing ◽  
Spatial And Temporal Variation ◽  
Extensive Discussion ◽  
Deterministic Theory ◽  
Theoretical Approaches

The mechanisms governing the evolution of the wind-wave field in time and in space are not yet fully understood. Various theoretical approaches have been offered to model wind-wave generation. To examine their validity, detailed and accurate experiments under controlled conditions have to be carried out. Since it is next to impossible to get the required control of the governing parameters and to accumulate detailed data in field experiments, laboratory studies are needed. Extensive previously unavailable results on the spatial and temporal variation of wind waves accumulated in our laboratory under a variety of wind-forcing conditions and using diverse measuring techniques are reviewed. The spatial characteristics of the wind-wave field were determined using stereo video imaging. The turbulent airflow above wind waves was investigated using an X-hot film. The wave field under steady wind forcing as well as evolving from rest under impulsive loading was studied. An extensive discussion of the various aspects of wind waves is presented from a single consistent viewpoint. The advantages of the stochastic approach suggested by Phillips over the deterministic theory of wind-wave generation introduced by Miles are demonstrated. Essential differences between the spatial and the temporal analyses of wind waves’ evolution are discussed, leading to examination of the applicability of possible approaches to wind-wave modeling.

Numerical Study on Controllable Multi-Band Microwave Metamaterial Absorbers

2011 ◽  
Vol 239-242 ◽  
pp. 1260-1264
Author(s):  
Wei Wei Ji ◽  
Tao Wang ◽  
Yan Nie ◽  
Rong Zhou Gong
Keyword(s):  
Numerical Study ◽  
Impedance Matching ◽  
Single Layer ◽  
Surface Current ◽  
Metamaterial Absorber ◽  
Band Absorption ◽  
Different Dimensions ◽  
Resonant Feature ◽  
Difference Time ◽  
Multi Band

Based on the impedance matching and electromagnetic resonant characteristic of composite materials, we present a single-layer metamaterial absorber consisting of arch copper loop and substrate FR-4, of which the resonant frequency depended on the loop’s geometry perimeter. By combining resonant loops with different dimensions together, we can achieve multi-band absorption. The standard finite difference time domain method was used to calculate the magnitudes of reflectance, and then the induced surface current and power loss distributions were demonstrated to analyze the insight physical picture of the multi-band resonant feature. By optimizing the simulation results, the absorptivities of two absorption peaks are all above 98% when the number of copper loops is two, 95% for three absorption peaks of three loops, and 87% for four absorption peaks of four loops.

Evolution of a nonlinear wave field along a tank: experiments and numerical simulations based on the spatial Zakharov equation

2001 ◽  
Vol 427 ◽  
pp. 107-129 ◽  
Author(s):  
L. SHEMER ◽  
HAIYING JIAO ◽  
E. KIT ◽  
Y. AGNON
Keyword(s):  
Theoretical Model ◽  
Wave Field ◽  
Nonlinear Wave ◽  
Numerical Study ◽  
Spectral Width ◽  
Spatial Evolution ◽  
Zakharov Equation ◽  
Free Wave ◽  
Laboratory Tank ◽  
Nonlinear Wave Field

Evolution of a nonlinear wave field along a laboratory tank is studied experimentally and numerically. The numerical study is based on the Zakharov nonlinear equation, which is modified to describe slow spatial evolution of unidirectional waves as they move along the tank. Groups with various initial shapes, amplitudes and spectral contents are studied. It is demonstrated that the applied theoretical model, which does not impose any constraints on the spectral width, is capable of describing accurately, both qualitatively and quantitatively, the slow spatial variation of the group envelopes. The theoretical model also describes accurately the variation along the tank of the spectral shapes, including free wave components and the bound waves.

scholarly journals Surface Current Patterns in the Northeastern Chukchi Sea and Their Response to Wind Forcing

2017 ◽  
Vol 122 (12) ◽  
pp. 9530-9547 ◽  
Author(s):  
Ying‐Chih Fang ◽  
Rachel A. Potter ◽  
Hank Statscewich ◽  
Thomas J. Weingartner ◽  
Peter Winsor ◽  
...  
Keyword(s):  
Chukchi Sea ◽  
Surface Current ◽  
Wind Forcing
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