Sonar Quiz #26

[rnvinc]

This one is kinda unique ...

Explain the lighter area in between the 2 darker areas ...

Credit to Gil at THT for the pic ...



Rickie

[wilbur]

Its higher than the darker spots could be a berm of some kind.

[apersohn17]

Structure then shadow of structure then slope up then shadow of slope??

[genec]

FROM THE STRUCTURE LINE IT START A SLIGHT SLOPE THEN A DEEPER HOLE THAT LEAVE DARK FOR NO SIGNAL ,THEY PASS OVER HOLE

[genec]

PLUS THE LIGHT PART IS ALSO BOTTOM CHANGE FROM THE HARD ROCKY BOTTOM TO SOFTE R BOTTOM

[matzilla]

I think I have seen one of these before....here's a shot of what I think it is when you scan perpendicular to the object




that is a lock and dam bullnose which would look very similar to the above photo if you were parallel to it.

[Redge]

Just a guess but I think this is what you are looking at as far as shape underwater.

[rnvinc]

Just a guess but I think this is what you are looking at as far as shape underwater.

Thanks Redge ... I don't have to work up a diagram now that you have already ...

As this shot is not mine ... I can't be 100% sure myself ...

But all of your suggestions pose very possible scenarios ...and this is the important point ...

That we all understand how harder bottom composition ...or a rising berm can reflect more sonar data than the dark shadows and off-sloping bottom ...

You guys have done well ...



Rickie

[rnvinc]

I think I have seen one of these before....here's a shot of what I think it is when you scan perpendicular to the object




that is a lock and dam bullnose which would look very similar to the above photo if you were parallel to it.

That's a great shot matzilla ...the individual rocks have amazing detail in your shot ...

Very cool ...

Rickie