Aldo Sottolichio, Isabel Jalon Rojas, Sabine Schmidt University of Bordeaux, EPOC, France David Hurther LEGI (Laboratory of Geophysical and Industrial.

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Presentation transcript:

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 SPM concentration in a turbid estuary Alain Crave University of Rennes-IRD, France

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

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)

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

Jalon Rojas et al, 2015, HESS Long term monitoring

Jalon Rojas et al, 2015, HESS

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

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

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

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

STBD NKE Calibration in the laboratory

turbidity in NTU

inversion with first part inversion with low part turbidité brute marée

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

Experiment 3 (nov 2005) g/l

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

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)

LISST measurements along the estuary (Marchal, 2014)

Representiveness of a single point long-term measurement ?

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 solve with one single probe