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Thread: Sonar Quiz #22

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    Default Sonar Quiz #22


    What details in the following image give indication of bottom hardness/softness ...??

    Explain what is happening to the sound pulse (ping) for that echo data to be "painted" as seen in the image ...

    Name:  969095E0-884A-4F25-9335-5A7EAF7B7850.jpg
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    Rickie
    Last edited by rnvinc; 09-09-2017 at 01:09 PM.
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    Default Sonar Quiz #22

    Quote Originally Posted by rnvinc View Post
    What details in the following image give indication of bottom hardness/softness ...??

    Explain what is happening to the sound pulse (ping) for that echo data to be "painted" as seen in the image ...

    Name:  969095E0-884A-4F25-9335-5A7EAF7B7850.jpg
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    Rickie
    I see a second and third trip of the sonar pulse depicted.
    The hardness/softness can be seen via the color bar or the harder bottom will continue to show in the 2nd and 3rd echo shown.

    Is that what you are looking for Rickie?
    Last edited by rnvinc; 09-09-2017 at 01:10 PM.
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    May be wrong on this but we learn from our mistakes

    Looking at the screen shot I would also think you have more of a peegravel bottom than slab rock with silt based on the thickness of the red return. The multiple bottom returns are from the echo of the pulse, I think I said that right...

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    I believe what causes the multiple returns is the transmission reflecting between bottom and water surface. The hardness of the bottom is indicated by the color palette. In soft bottoms too much of the transmission is dissipated to provide multiple returns. There is also some transmission loss each time it reflects from the surface of the water back down.

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    what happened here

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    In the pic it is a double and triple echo from the original return. Each will be less clear as it repeats. If the bottom depth was set at 150 you should see two more returns and get less clear. I have heard that catfish will not show up in the double echo because they have no scales and that scaled fish will show up on the second echo. As far as the bottom in the original signal, it appears to be a thin harder layer with a softer layer underneath.
    Last edited by Knappy; 11-01-2014 at 08:59 PM.
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    Quote Originally Posted by kosmo View Post
    what happened here
    Where the echo is missing in the second and third time around is the softest bottom in the first time echo. Where the echo is hardest will keep showing up in the 2nd and 3rd echo.
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    Default Sonar Quiz #22

    I can tell some of you guys remember the "2nd Echo" from the flasher days ...

    Name:  IMG_0962.jpg
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    Remember ... The 2d display must be set to a lower range that allows enough room on the display to even see the 2nd echo ...(and multiples thereof)...

    That is ... If bottom hardness/softness is something you want discern in the 2d image ...

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    Rickie
    Last edited by rnvinc; 09-09-2017 at 02:43 PM.
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    Check your saved 2d snapshots ...

    If you have any examples of the 2nd echo ... Post them here for everyone to see ...

    Rickie
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    Can a person, using di, tell the bottom hardness?????

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