Stephan Kistner

Stephan Kistner

Joined: 8/9/2019

  • Re: Mike 21BW - Large Breaking Waves causing High-Frequency Noise

    Tue, 17 Nov 2015 11:54:23 GMT – Mike 21BW - Large Breaking Waves causing High-Frequency Noise
    Update: The 6-sec waves are some sort of reflection - another problem on it's own!

    The chart below shows a more accurate FFT. The blue series indicates the energy spectrum at the wave-breaking line and the red series indicates the energy spectrum near the generation line.

    [img width=200 height=134]http://i.imgur.com/fDca3Th.jpg[/img]

  • Mike 21BW - Large Breaking Waves causing High-Frequency Noise

    Tue, 17 Nov 2015 09:57:50 GMT – Mike 21BW - Large Breaking Waves causing High-Frequency Noise
    Hi All

    I'm currently running the following domain:
    [b]Depth[/b]: -12 to +8m (Moving Shoreline + Breaking Waves)
    [b]Grid[/b]: 2m x 2m
    [b]Wave-series[/b]: 3.2m / 12 sec regular waves

    Where the waves break a high-frequency noise start to appear. This eventually influences the wave breaking pattern, currents, etc. A quick Fast-Fourier Transformation revealed 6 and 6.7second waves to appear in this area (as shown in the picture). When using smaller waves (Hs < 2.0m) this problem becomes less prominent. Any ideas on how to reduce this high-frequency noise?

    [img width=200 height=112]http://i.imgur.com/zHHIBIl.jpg[/img]

    [i]The red-circled part on the chart represents 6.0 and 6.7sec waves and the yellow part the 12sec waves as expected.[/i]

  • Re: Importing Bathymetry Data into MIKE2012

    Mon, 02 Nov 2015 14:05:08 GMT – Importing Bathymetry Data into MIKE2012
    Hi!

    Thanks, this was also very useful for importing Bathy data from Surfer (Golden Software).

    By exporting a Surfer's grid (".grd") file to a ASC Arc (".asc") file I was able to use the Grd2Mike tool in a similar way. I'm not sure if there's a better way, but this works much better and faster than my precious Surfer-Excel-Mike method (don't ask!).

    Regards,
    SKistner