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J.R. Marko and D.B. Fissel ASL Environmental Sciences Inc. Sidney B.C. Canada Martin Jasek

ASL Shallow Water Ice Profiler SWIP-5. J.R. Marko and D.B. Fissel ASL Environmental Sciences Inc. Sidney B.C. Canada Martin Jasek BC Hydro Ltd.

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J.R. Marko and D.B. Fissel ASL Environmental Sciences Inc. Sidney B.C. Canada Martin Jasek

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  1. ASL Shallow Water Ice Profiler SWIP-5 J.R. Marko and D.B. Fissel ASL Environmental Sciences Inc. Sidney B.C. Canada Martin Jasek BC Hydro Ltd.

  2. Peace River Acoustic Studies initiated in Nov.2004 to monitor ice growth with the SWIPS (Shallow Water Ice Profiling Sonar), a shore-based, realtime version of ASL’s IPS a marine Upward Looking Sonar profiler Operated by recording returns of 235 kHz acoustic pulses to detected ranges to ice undersurface to estimate draft (with aid of hydrostatic and atmospheric pressure data)

  3. Self-Contained Deployment Configuration

  4. SWIP Pressure Housing / Transducer

  5. IPS5Link Software

  6. Acoustic Range and Ice Draft Data

  7. 2004-5 results showed both significant internal structure in ice cover AND evidence of weak detection of frazil particles in water column

  8. Frazil returns relatively uniform or even bottom weighted in water column in supercooling intervals prior to ice cover formation BUT concentrated in upper 1 m late in ice covered season

  9. Self-Contained Deployment Configuration Self-Contained Deployment Configuration 2004-5 results and BC Hydro’s interests in water column frazil motivated adjacent 2005-6 deployments of the 235khz (SWIPS1) and a higher frequency (545 kHz) SWIPS2 instrument. • Higher SWIPS2 frequency raises sensitivity to small particles (cross-section proportional to f4) • Both instruments equipped with electric heaters to minimize beam interruption by anchor ice   • 2005-6 heater results: Mixed (SWIPS2 heater was turned off, SWIPS1 solved old problem but not another)

  10. Early season results showed benefits of higher frequency … higher sensitivity to frazil by about 31 dB as predicted 235 KHz unit data- Low frequency results show weak returns from the water column (depths < 2.94m) . Simultaneous 546 kHz data- High frequency results show full range of return variability in same intervals (depths < 4.8 m).

  11. SWIP Water Level Data Requires Atmospheric Pressure Data from Regional Weather Station

  12. SWIP Customers

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