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Old 09-05-2008, 10:56 PM   #1
Diver1111
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Join Date: Jun 2005
Location: Exeter NH
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Default More side-scan-sonar images

Hi All,

I post some new shots I have taken of old things in the lake:

- Empty Pockets off Diamond: Always tough to get a good shot of as it's water-logged wood (not very reflective) and sits at a right angle to the shore sloping downwards-opposite of what I need for a good scan; Best scans are taken at 90 degrees to the target;

- Crude shot of the Lady of Lake in Glendale;

- Log field off Meredith (west side): Adjacent to the old shake factory, now the site of Church Landing; I am guessing these are very old logs that wound up in the lake on their way to the factory on the shore nearby; This area is littered with such logs;

- "Pile Driver barge w-derrick" off Weirs: I am guessing it is made of wood by the lack of reflectivity; I am told it has/had a derrick on board to drive the piles-the pointed object appears to be the derrick, which I think has fallen over off the end of the barge; Derricks are upright when in position;

- Barge w-derrick #2; Clearly something is laying on the lake floor-long, fairly pointed-derrick?

- Barge-heavy metal on deck; Something very hard is creating the white area; I'm guessing it's industrial equipment of some kind; Whatever it is it's pretty big and box-like, clearly metal;

- Sonar vs. Side-Scan-Sonar: Pile driver barge on sonar (fishfinder)/left image and side-scan-sonar/right image together via a split screen; The barge doesn't even show up on the sonar and considering it's supposed to be 90 feet long you would think it might; You can see what appears to be the derrick again, lying on the lake floor to the left of the main deck; The blue area in the image to the right of the green arrow is the water column (surface to lake floor); The white string-like image is actually my marker buoy (the white dot) and line, descending from the surface of the lake down to the deck; The marker buoy looks like it's hanging in the water column somewhere under water, but it's not; I'm surprised I even picked it up on side scan but it does have some metal clips and rings on it that reflected.
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