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EM 710 Multibeam echosounder

Introduction

EM 710 multibeam echosounder data examples - Click to enlarge picture

The EM 710 multibeam echosounder is a high to very high resolution seabed mapping system capable of meeting all relevant survey standards. The system configuration can be tailored to the user's requirement, allowing for choice of beam widths as well as transmission modes. The minimum survey depth is from less than 3 meters below the transducers, and the maximum depth is approximately 2000 meters, somewhat dependant upon array size. Across track coverage (swath width) is up to 5.5 times water depth, to a maximum survey depth more than 2000 meters.

EM 710 Multibeam echosounder models

There are three basic versions of the EM 710 multibeam echosounder each with different range performances:

  • EM 710 - Full performance version
  • EM 710S - CW pulse forms only
  • EM 710RD - Short CW pulse only

Operation software

Alternative post processing software

Note: KONGSBERG is not responsible for any system malfunction caused by 3rd party software.

Defining a new resolution standard for bathymetric surveys

One of the goals when we developed the EM 710 0.5x1 multibeam echo sounder system was to offer to the market a higher standard of resolution than previously possible. The improved resolution is provided by the 0.5 degree, focussed transmit beam - in combination with high density processing applied to the high number of dynamically focussed receive beams. The 0.5 degree transmit beam has a very small footprint, only 85cm long at 100m depth. So in order to ensure 100% bottom coverage even at high survey speeds we developed a new scheme by which 2 complete sounding profiles are generated for each ping cycle. By reducing the swath width, the operator can also increase the ping rate, see the graph below:

Ping rate as a function of depth

Survey speed

So at 100m depth, with full swath width +/-70 degrees the system has 2 pings per second, or 4 sounding profiles. The maximum survey speed while maintaining 100% bottom coverage is then 3.4 m/sec or 6.8 knots. By reducing the swath width to +/- 55 degrees, the ping rate is increased to 3.4 and the survey speed can then be raised to 11.5 knots. Each sounding profile consists of 400 soundings.

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