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2. Development of the AEM bathymetry method – initial studies Initial studies in the use of AEM for bathymetric mapping took place in the 1980s. Morrison and Becker (1982) were the first to consider the use of AEM systems for mapping water depths in a feasibility report commissioned by the US Office of Naval Research (ONR) to support rapid airborne bathymetric mapping in shallow coastal waters. Morrison and Becker (1982) investigated both time domain and frequency domain systems existing at the time and concluded that frequency-domain systems would be limited to a depth of approximately 20 m and that the INPUT4 fixed-wing time-domain system, with a lower operating base frequency, was suitable for measurement depths of 50 to 60 m.

Introduction Traditional methods for measuring the water depth rely on sonar soundings. However airborne techniques offer the advantages of increased survey speed and operation over dangerous waters that may be affected by very strong tides and the presence of shoals and reefs that limit the operation of surface vessels. The airborne lidar method has been used very successfully for mapping coastal waters and relies on the difference in the time between a laser pulse (infra red wavelength) reflected from the sea surface and a separate laser pulse (blue-green wavelength) reflected from the sea floor.

4 presents an example of how the EM footprint affects the lateral and vertical resolution using 1D inversion. Ltd. The RepTEM system recently replaced the HoistEM system. 97 Table 2. Liu-Becker inductive-limit footprint sizes (footprint to transmitter height ratios) for several common AEM systems. Tx: transmitter, Rx: receiver. For TEM systems, the geometry is specified by the directions of the Tx and Rx dipole axes: Tx(z)-Rx(z) denotes a vertical-axis Tx and vertical-axis Rx, Tx(z)-Rx(x) denotes a vertical axis Tx and a horizontal-axis (inline) Rx.

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