Source Term Balance for Finite Depth Wind Waves

Abstract A field experiment to study the spectral balance of the source terms for wind-generated waves in finite water depth was carried out in Lake George, Australia. The measurements were made from a shore-connected platform at varying water depths from 1.2 m down to 20 cm. Wind conditions and the geometry of the lake were such that fetch-limited conditions with fetches ranging from approximately 10 km down to 1 km prevailed. The resulting waves were intermediate-depth wind waves with inverse wave ages in the range 1 < U10/Cp < 8. The atmospheric input, bottom friction, and whitecap dissipation were measured directly and synchronously by an integrated measurement system, described in the paper. In addition, simultaneous data defining the directional wave spectrum, atmospheric boundary layer profile, and atmospheric turbulence were available. The contribution to the spectral evolution due to nonlinear interactions of various orders is investigated by a combination of bispectral analysis of the data and numerical modeling. The relatively small scale of the lake enabled experimental conditions such as the wind field and bathymetry to be well defined. The observations were conducted over a 3-yr period, from September 1997 to August 2000, with a designated intensive measurement period [the Australian Shallow Water Experiment (AUSWEX)] carried out in August–September 1999. High data return was achieved.

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Spectral form and source term balance of short gravity wind waves

Journal of Japan Society of Civil Engineers Ser B2 (Coastal Engineering) ◽

10.2208/kaigan.70.i_111 ◽

2014 ◽

Vol 70 (2) ◽

pp. I_111-I_115

Author(s):

Hitoshi TAMURA ◽

William M. DRENNAN ◽

Erik SAHLEE ◽

Hans C. GRABER

Keyword(s):

Source Term ◽

Wind Waves ◽

Spectral Form

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On the Wave Bottom Shear Stress in Shallow Depths: The Role of Wave Period and Bed Roughness

Water ◽

10.3390/w10101348 ◽

2018 ◽

Vol 10 (10) ◽

pp. 1348 ◽

Cited By ~ 13

Author(s):

Sara Pascolo ◽

Marco Petti ◽

Silvia Bosa

Keyword(s):

Shear Stress ◽

Dynamic Equilibrium ◽

Dominant Role ◽

Wind Waves ◽

Sediment Resuspension ◽

Growth Curves ◽

Finite Depth ◽

Wave Period ◽

Bed Shear Stress

Lagoons and coastal semi-enclosed basins morphologically evolve depending on local waves, currents, and tidal conditions. In very shallow water depths, typical of tidal flats and mudflats, the bed shear stress due to the wind waves is a key factor governing sediment resuspension. A current line of research focuses on the distribution of wave shear stress with depth, this being a very important aspect related to the dynamic equilibrium of transitional areas. In this work a relevant contribution to this study is provided, by means of the comparison between experimental growth curves which predict the finite depth wave characteristics and the numerical results obtained by means a spectral model. In particular, the dominant role of the bottom friction dissipation is underlined, especially in the presence of irregular and heterogeneous sea beds. The effects of this energy loss on the wave field is investigated, highlighting that both the variability of the wave period and the relative bottom roughness can change the bed shear stress trend substantially.

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Numerical Investigation of Spectral Evolution of Wind Waves. Part I: Wind-Input Source Function

Journal of Physical Oceanography ◽

10.1175/2009jpo4345.1 ◽

2010 ◽

Vol 40 (4) ◽

pp. 656-666 ◽

Cited By ~ 28

Author(s):

K. N. Tsagareli ◽

A. V. Babanin ◽

D. J. Walker ◽

I. R. Young

Keyword(s):

Field Data ◽

Source Function ◽

Source Term ◽

Wind Waves ◽

The Novel ◽

Spectral Evolution ◽

Input Source ◽

Wind Input ◽

Strong Winds ◽

Lake George

Abstract This paper is dedicated to the investigation and calibration of the parameterized form for the wind-input source term Sin proposed earlier on the basis of field observations at Lake George, Australia. The main objective of this study was to obtain spectral forms for the wind-input source function Sin, which incorporates the novel observation-based features and at the same time satisfies the important physical constraint that the total integrated wind input must agree with independently observed magnitudes of the wind stress. Within this approach, a new methodology, a dynamic self-adjusting routine, was developed for correction of the wind-input source function Sin. This correction involves a frequency-dependent adjustment to the growth rate γ( f ), based on extrapolations from field data. The model results also show that light winds require higher-rate adjustments of the wind input than strong winds.

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Spectral form and source term balance of short gravity wind waves

Journal of Geophysical Research Oceans ◽

10.1002/2014jc009869 ◽

2014 ◽

Vol 119 (11) ◽

pp. 7406-7419 ◽

Cited By ~ 10

Author(s):

Hitoshi Tamura ◽

William M. Drennan ◽

Erik Sahlée ◽

Hans C. Graber

Keyword(s):

Source Term ◽

Wind Waves ◽

Spectral Form

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Adjusting of Wind Input Source Term in WAVEWATCH III Model for the Middle-Sized Water Body on the Basis of the Field Experiment

Advances in Meteorology ◽

10.1155/2016/8539127 ◽

2016 ◽

Vol 2016 ◽

pp. 1-13 ◽

Cited By ~ 7

Author(s):

Alexandra Kuznetsova ◽

Georgy Baydakov ◽

Vladislav Papko ◽

Alexander Kandaurov ◽

Maxim Vdovin ◽

...

Keyword(s):

Wind Speed ◽

Field Experiment ◽

Water Body ◽

Source Term ◽

Wind Waves ◽

Surface Wind ◽

Simulated Data ◽

Wavewatch Iii ◽

Input Source ◽

Wind Input

Adjusting of wind input source term in numerical model WAVEWATCH III for the middle-sized water body is reported. For this purpose, the field experiment on Gorky Reservoir is carried out. Surface waves are measured along with the parameters of the airflow. The measurement of wind speed in close proximity to the water surface is performed. On the basis of the experimental results, the parameterization of the drag coefficient depending on the 10 m wind speed is proposed. This parameterization is used in WAVEWATCH III for the adjusting of the wind input source term within WAM 3 and Tolman and Chalikov parameterizations. The simulation of the surface wind waves within tuned to the conditions of the middle-sized water body WAVEWATCH III is performed using three built-in parameterizations (WAM 3, Tolman and Chalikov, and WAM 4) and adjusted wind input source term parameterizations. Verification of the applicability of the model to the middle-sized reservoir is performed by comparing the simulated data with the results of the field experiment. It is shown that the use of the proposed parameterizationCD(U10)improves the agreement in the significant wave heightHSfrom the field experiment and from the numerical simulation.

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