TY - GEN
T1 - Turbulence Implications on Suspended Sediment Concentration Assessment by Using the ADCP
AU - Guerrero, Massimo
AU - Conevski, Slaven
AU - Ruther, Nils
AU - Di Federico, Vittorio
N1 - Publisher Copyright:
© 2023 IAHR – International Association for Hydro-Environment Engineering and Research.
PY - 2023
Y1 - 2023
N2 - The acoustic Doppler current profiler, ADCP, is applied worldwide to characterize the water velocity field in relevant environments e.g., lake, river channel, estuarian, costal shelf, ocean. This is based on the detection of the Doppler frequency shift from the backscattering strength BS of particles transported in the water flow. At the same time the BS is applied to solve the inverse problem which yields the suspended sediment concentration, SSC. Active transducers emit modulated pulses to enhance the Doppler content. Incoherent and coherent techniques result in different bandwidth of the emitted signal which apply at a number of scales and resolutions of velocity profiling. In case of turbulent flow, velocity oscillations within the bandwidth of received signal show an inverse correlation to BS which bore out a possible bias on SSC assessment. Within this contribute a preliminary assessment is proposed which elucidates the scale of overlapping between turbulence fluctuations and sound waves as modulated by the ADCP and the resulting bias on SSC.
AB - The acoustic Doppler current profiler, ADCP, is applied worldwide to characterize the water velocity field in relevant environments e.g., lake, river channel, estuarian, costal shelf, ocean. This is based on the detection of the Doppler frequency shift from the backscattering strength BS of particles transported in the water flow. At the same time the BS is applied to solve the inverse problem which yields the suspended sediment concentration, SSC. Active transducers emit modulated pulses to enhance the Doppler content. Incoherent and coherent techniques result in different bandwidth of the emitted signal which apply at a number of scales and resolutions of velocity profiling. In case of turbulent flow, velocity oscillations within the bandwidth of received signal show an inverse correlation to BS which bore out a possible bias on SSC assessment. Within this contribute a preliminary assessment is proposed which elucidates the scale of overlapping between turbulence fluctuations and sound waves as modulated by the ADCP and the resulting bias on SSC.
KW - Acoustic Doppler current profiler
KW - Profiling resolution
KW - Signal modulation
KW - Suspended sediment concentration
KW - Turbulence
UR - http://www.scopus.com/inward/record.url?scp=85187702818&partnerID=8YFLogxK
U2 - 10.3850/978-90-833476-1-5_iahr40wc-p0710-cd
DO - 10.3850/978-90-833476-1-5_iahr40wc-p0710-cd
M3 - Conference contribution
AN - SCOPUS:85187702818
SN - 9789083347615
T3 - Proceedings of the IAHR World Congress
SP - 2901
EP - 2910
BT - Proceedings of the 40th IAHR World Congress
A2 - Habersack, Helmut
A2 - Tritthart, Michael
A2 - Waldenberger, Lisa
PB - International Association for Hydro-Environment Engineering and Research
T2 - 40th IAHR World Congress, 2023
Y2 - 21 August 2023 through 25 August 2023
ER -