JFE-680
JFE-680 Echo Sounder - ProNav
JFE-680 Echo Sounder - ProNav
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Seabed Quality Change<br />
Mud<br />
Rock<br />
In case of a hard seabed composed of rocks etc., its return trails long, as shown in right chart.<br />
In case of a soft seabed made of mud, seaweed, etc., they poorly reflect an ultrasonic wave<br />
to result in thin recording of the seabed with short trail.<br />
The seabed quality can be more sufficiently identified with use of wider beam angle and<br />
longer pulsewidth.<br />
Usually lower frequency is used.<br />
Appendix 46