Attenuation and Multi-Path Interference in the Operation of a Ultrasonic Velocity Meter in the Sacramento-San Joaquin River Delta ( references |96-97 time line |lunar days )

• Transparency 1: Title and Authors
• Transparency 2: Outline of Talk
• Transparency 3: Theory of Attenuation of Ultrasound by Suspended Sediment
• Transparency 4: 8-ms waveform, transducer drive and received signal
• Transparency 5: A full 31-bit m-sequence, transducer drive and received signal
• Lunar Days: Signal strength and stage, plotted by lunar days
• Signal Intensity Data
• Transparency 5: Signal Intensity Data, December 12, different averaging times>
• pusgsa: USGS data at 3-Mile Slough, Winter 1997
• pusgsb1: All USGS data at 3-Mile Slough, Winter 1997
• pusgsc: USGS stage and current velocity, November 26-27, 1996
• pNDJa: Attenuation during Nov., Dec., and Jan.
• pNDJb: Signal and Transducer Drive during Nov., Dec., and Jan.
• pJJAa: rms signals during Summer 1997.
• multi1: multi-path interference diagram
• ld98548: Transparency showing interference fit to lunar day with noon at 0:01 am Dec. 25.
• ld98558: Transparency showing interference fit to lunar day with noon at 1:00 am Dec. 26.
• ts98043: Graph of signal rms and tide stage, for a tidal cycle on Nov 3 1996.
• ts98043a: Graph of signal rms, tide stage, and current velocity, for a tidal cycle on Nov 3 1996.
• raysep: Separation of direct ray from reflected ray in the cross-correlation function.
• pcora: Auto- and Cross-Correlation Functions for the waveform wss61212.002
• pcorb: Expanded cross-correlation function for wss61212.002, and times of delayed arrivals.
• cor/pcor: Lots of correlation functions
• pcora2: Auto- and Cross-Correlation Functions for the waveform wav61212.002
• pcora3: Auto- and Cross-Correlation Functions for the waveform wss61212.003
• pcora4: Auto- and Cross-Correlation Functions for the waveform wav61212.003
• cor/cs8: Cross-Correlation Functions in groups of 8.
• concl.html: Conclusions (last transparency)