ADCP Measurement of Suspended Sediment in the Tidal Hudson River Elizabeth Nystrom Gary Wall New York District.

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Presentation transcript:

ADCP Measurement of Suspended Sediment in the Tidal Hudson River Elizabeth Nystrom Gary Wall New York District

Hudson River Basin $89 billion of cargo went through the port of NY/NJ in 2002 River is tidal 153 miles to Federal Dam at Troy Can’t use conventional methods to measure suspended sediment load

Acoustic Backscatter as a Surrogate for Suspended Sediment Relate the signal echo strength to concentration of suspended sediment Signal Echo

Acoustic Modem Uplooking ADCP 600 kHz Sentinel 1 ensemble every 15 min Transmit data over acoustic modem ~ 60 ft deep ADCP

Load Computations Suspended Sediment Load = SSC * Q Suspended Sediment Ratings –Acoustic Backscatter  Concentration –Uplooker ABS  Cross Section ABS Discharge Rating –Uplooker Velocity & Wind Stress  Discharge

Backscatter – Concentration Rating Development

Backscatter-Concentration Rating Typical tidal range of ABS: ~15 dB Observed range of ABS: 65 – 100 dB Typical concentration: mg/L Max concentration: ~200 mg/L SSC = 10 (0.035 * ABS – 0.01 * Temp – 1.21) * 1.055

Discharge Rating Typical tidal range ± 300,000 cfs Peak flows: -345,000 & 380,000 Max net flow: ~125,000 Q = 130,883 * Vel * Wind Stress – 14,244

Data Transfer (not to scale)

Raw Data WinRiver ASCII Excel ADAPS Data Processing Atmospheric data

Near Real Time Data Velocity, backscatter and discharge data Updated daily

Questions? For more information: Poster session later today Project web page: