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Mary river coastal plain subsurface hydrology study 1992.



Mary river coastal plain subsurface hydrology study 1992.


Chin, D.; Martin, K.; Schwartz, T.; Jolly, P.


E-Publications; E-Books; PublicationNT; Report ; 20/1993




Made available via the Publications (Legal Deposit) Act 2004 (NT).





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Power and Water Authority

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Report ; 20/1993

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Technical Report WRD93020 Viewed at 15:07:19 on 29/07/2010 Page 92 of 132. instrument with an early time option. This instrument records across 32 channels out to a ma-ximum delay time of 165 milliseconds. The instruments resolution is of the order of one nanovo]t. It has a high degree of ambient noise rejection due to its ability to stack up to 2048 separate readings. This is performed simultaneously over all channels so that the background noise is common to all channels at the time of measurement. \Vith coinddent ccntres the receiving and transmitting loop sides were 31 and 25 meters respectively. TIlis ensured good signal to noise ratios throughout the survey. Offset loops wew employed to avoid super-paramagnetic effects which are associated with certain ferrous minerals in the soil profile. Further definition of shallow conductivities might be gained by using Protem allowing much earlier times than early time Sirotem. Cl.2.2 Airborne electromagnetics The system used was, Questem, a time domain airborne electromagnetic system installed in a Britten - Norman Tri~lander aircraft. A total of 142km was flown. The geometry of the system is illustrated in Figure C1.2.2(a). SUfVt.'Y specifications were: line spacing 200m, sample interval at 4Hz (approx. 12m) and line direction cast - west. Technical specifications were: aircraft ground speed 110 knots, aircraft terrain clearance 120m, Ei\1 bird terrain clearance 40m, EM base frequcncy 75Hz, EM channels 64 binned to 15 and EM resolution 1 ppm.

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