An in situ attenuance meter for very turbid waters

Ohm, K.

doi:10.1007/bf02224514

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…An Aanderaa current meter with turbidity sensor is maintained there permanently at a sampling rate of (in general) 10 min At present, only optical methods have the potential to cover the necessary wide range of the spectrum of variability of the suspended matter transport. Krause and Ohm [1984] described a method that provides time series of suspended matter transports in estuaries based on an optical beam transmittance meter [Ohm, 1979]…”

Section: The Weser Estuarymentioning

confidence: 99%

Transport processes of suspended matter derived from time series in a tidal estuary

Grabemann¹,

Krause²

1989

J. Geophys. Res.

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Optical beam transmittance meters integrated into Aanderaa current meters were used to measure long time series of suspended matter concentration simultaneously with current velocity and salinity in the turbidity maximum of the Weser estuary (shallow coastal plain estuary of the North Sea). They cover the spectrum from 10 min to several months. The time histories of concentrations and fluxes are discussed for characteristic locations within the turbidity maximum. The analyses demonstrate that the tidal dynamics of deposition into and resuspension of particles from temporally and spatially limited material sources at the bottom is the dominant process in the turbidity maximum while the nontidal gravitational circulation acts as a long-term source and sink. There is a remarkable repeatability of concentration patterns during similar discharge conditions. the tidal excursion can cause tidal fluctuations of about 10%o 14,373 14,374 GRABEMANN AND KRAUSE' TIME SERIES OF SUSPENDED MATTER ß ••i• OFE Bremerhaven NORDENHAM ,"

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Section: The Weser Estuarymentioning

confidence: 99%