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How to do bar check at hydrographic survey jane's engineering life 82 subscribers subscribe The document discusses methods for determining the velocity of sound in water, which is necessary for accurate depth measurement in hydrographic surveys. Bar check procedure when everything is right
If the multibeam echosounder (mbe) is noisy, you may set the depth gate filter to ignore anything above/below the expected depth gate from the bar depth. Hydrobar simplifies both sound velocity casts and “bar checks”. To ensure the correct sound velocity (sv) is used, a bar check should be conducted before the survey commences
The bar check involves lowering a flat plate below the echo sounder transducer to several known depths below the surface and comparing the actual versus measured depth.
The bar check is used to calibrate a depth sounder for draft and can also be used for calibrating the speed of sound throughout the water column in survey sites with a maximum water depth of 50 to 75 ft. Hydrobar is a hydrographic tool for calibrating survey echo sounders during field surveys Unabara introduces its newest hydrographic tool, hydrobar, for calibrating hydrographic echo sounders during field surveys
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