Optimal High Frequency Cut-off in SWAN Wave Model

Authors

  • Chavoshian, Seyed Ali
  • Siadatmousavi, Seyed Mostafa
Abstract:

This study investigates the importance of selecting an appropriate cut-off frequency in the SWAN model when it is applied to areas with limited fetches. In SWAN, the cut-off frequency is a constant value set by user in the model, and its appropriate selection plays an important role in the accuracy and optimization of the wave model; very high value increases the computational cost and might lead to increase of approximations in the nonlinear wave-wave interaction term. On the other hand, very low value affects the wave growth dynamics due to inaccurate nonlinear wave interactions. In this study SWAN was applied to the northern part of the Gulf of Mexico as a semi-enclosed basin and to the Lake Ijssell as a closed basin. The results showed that as wind fetch decreases, a higher value for the cut-off frequency is required to determine the prognostic region of the wave spectrum in the model. Based on the outputs, in coastal areas such as the northern Gulf of Mexico, 0.6 Hz is proposed for the cut-off frequency, while in small areas such as Lake Ijssel,0.9 Hz is a good choice. 

Upgrade to premium to download articles

Sign up to access the full text

Already have an account?login

similar resources

Using a Breakpoint to Determine the Optimal Cut-off Frequency

The aims of this study were to compare methods of determining the optimal cut-off frequency (CFopt) for a Butterworth filter. CFopt were determined for leg displacement data for treadmill running through residual analysis using regression (RA0reg), integral of the power spectral density (PSD), and both these methods analysed through a new ‘breakpoint’ method. RA0reg did not correlate with other...

full text

Uniqueness below a cut-off frequency for the two-dimensional linear water-wave problem

The two-dimensional velocity potential associated with the scattering of linear waves in water of finite but non-uniform depth is shown to be unique for Khmax ≤ 1. Here hmax is the maximum depth of the fluid and K = ω2/g, where ω is the angular frequency and g is the acceleration due to gravity. Uniqueness is established by proving that the homogeneous boundary value problem for the velocity po...

full text

Influence of the Lift-Off Effect on the Cut-Off Frequency of the EMAT-Generated Rayleigh Wave Signal

The electromagnetic acoustic transducer (EMAT), a non-contact NDT tool with large lift-off, is becoming an attractive method for detecting the cracks in the metal parts. However, the lift-off of the transducer has a direct effect on the feature that is used to characterize the defects. A detailed investigation on the relationship between the feature and the lift-off of the EMAT is crucial in th...

full text

On wave equations and cut-off frequencies of plane atmospheres

This paper deals with the one-dimensional vertical propagation of linear adiabatic waves in plane atmospheres. In the literature there are various representations of the standard form of the wave equation from which different forms of the so called cut-off frequency are inferred. It is not uncommon that statements concerning the propagation behavior of waves are made which are based on the heig...

full text

Order Low Pass Filter with Higher Cut-off Frequency

The design of CMOS based low pass filter for analog-to-digital, digital-to-analog and audio applications is described in this paper. Active load resistor and floating inductor is used for the implementation of low pass filter. CMOS technology has become dominant over bipolar technology for analog circuits design in mixed signal system. The differential floating active inductor is designed with ...

full text

My Resources

Save resource for easier access later

Save to my library Already added to my library

{@ msg_add @}


Journal title

volume 6  issue 20

pages  51- 64

publication date 2015-04

By following a journal you will be notified via email when a new issue of this journal is published.

Keywords

No Keywords

Hosted on Doprax cloud platform doprax.com

copyright © 2015-2023