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Aldo Sottolichio, Isabel Jalon Rojas, Sabine Schmidt University of Bordeaux, EPOC, France

SPM concentration in a turbid estuary. Aldo Sottolichio, Isabel Jalon Rojas, Sabine Schmidt University of Bordeaux, EPOC, France. David Hurther LEGI (Laboratory of Geophysical and Industrial Fluid Flows) Grenoble, France. Philippe Laguionie INSA, Rennes, France. Alain Crave

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Aldo Sottolichio, Isabel Jalon Rojas, Sabine Schmidt University of Bordeaux, EPOC, France

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  1. SPM concentration in a turbid estuary Aldo Sottolichio, Isabel Jalon Rojas, Sabine Schmidt University of Bordeaux, EPOC, France David Hurther LEGI (Laboratory of Geophysical and Industrial Fluid Flows) Grenoble, France Philippe Laguionie INSA, Rennes, France Alain Crave University of Rennes-IRD, France

  2. How do we deal with very high SPMC (>5g/l) ?

  3. What sensors do you use in monitoring, any other long-term observations and other ship surveys? optical OBS 3A Endress & Hauser TSBD NKE acoustic ADV Nortek (ADCP)

  4. Type of observing systems: profiler on ships, poles, mooring stations … Typical deployment time of your systems? from 13h to several months Location of deployments: near-bed, near-channel

  5. Long term monitoring Jalon Rojas et al, 2015, HESS

  6. Long term monitoring Jalon Rojas et al, 2015, HESS

  7. Calibration in the laboratory Calibrated in the range 0,1-300 g.l-1 with natural Gironde mud Optical Backscattering Sensor saturation zone (15-30 g.l-1)

  8. Calibration in the laboratory Argus Surface Meter ASM-IV Total length 1,44m Vertical resolution of 1cm Temporal sampling rate 0,33 Hz

  9. Calibration in the laboratory Calibrated in the range 0,4-80 g.l-1 with natural Gironde mud Argus Surface Meter ASM-IV

  10. Calibration in the laboratory Acoustic Doppler Velocimeter Vector ADV Intensity Calibrated with samples of natural mud SNR Empirical relations for C<5.5 g.-l and for C>5.5 g.l-1

  11. Calibration in the laboratory STBD NKE

  12. turbidity in NTU

  13. marée turbidité brute inversion with first part inversion with low part

  14. Experiment 2 (nov 2005) Comparison between C-ASM and C-ADV from water samples

  15. Experiment 3 (nov 2005) g/l

  16. Experiment 3 (nov 2005) Comparison between C-ASM and C-ADV from water samples

  17. Characteristics of the SPM at your locations (concentration, floc/particle size, organic fraction, mineralogy, ....)? Organic fraction : 2-10% Floc size : difficult to determine Particle size: only in lab (10 µm)

  18. LISST measurementsalongthe estuary (Marchal, 2014)

  19. Representiveness of a single point long-termmeasurement ?

  20. Conclusions • High SPMC: • - imited knowledge on in-situ particle charactetistics • (limited instrumentation) • ambiguity of bacscattering signal • easy to solve in a vertical profile • difficult to solvewith one single probe

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