Characteristics of instantaneous turbulent events in southern German Bight

Amirshahi, Seyed Mohammad; Kwoll, Eva

doi:10.1201/9781315644479-32

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…Two acoustic Doppler velocimeters record velocity at two levels with high frequency. Turbulence characteristics are computed from highly frequent velocity fluctuations (Amirshahi et al, 2016).…”

Section: Lander Sedobsmentioning

confidence: 99%

The Coastal Observing System for Northern and Arctic Seas (COSYNA)

et al. 2017

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Abstract. The Coastal Observing System for Northern and Arctic Seas (COSYNA) was established in order to better understand the complex interdisciplinary processes of northern seas and the Arctic coasts in a changing environment. Particular focus is given to the German Bight in the North Sea as a prime example of a heavily used coastal area, and Svalbard as an example of an Arctic coast that is under strong pressure due to global change.The COSYNA automated observing and modelling system is designed to monitor real-time conditions and provide short-term forecasts, data, and data products to help assess the impact of anthropogenically induced change. Observations are carried out by combining satellite and radar remote sensing with various in situ platforms. Novel sensors, instruments, and algorithms are developed to further improve the understanding of the interdisciplinary interactions between physics, biogeochemistry, and the ecology of coastal seas. New modelling and data assimilation techniques are used to integrate observations and models in a quasi-operational system providing descriptions and forecasts of key hydrographic variables.

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Section: Lander Sedobsmentioning

confidence: 99%

The Coastal Observing System for Northern and Arctic Seas (COSYNA)

et al. 2017

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“…Flow velocity and turbulence data were evaluated for possible influence by the lander frame or by other devices and removed if any influence was detected (Amirshahi et al, 2016).…”

Section: Lander Deploymentsmentioning

confidence: 99%

Predicted ripple dimensions in relation to the precision of in situ measurements in the southern North Sea

Krämer

2016

Ocean Sci.

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Abstract. Ripples are common morphological features in sandy marine environments. Their shapes and dimensions are closely related to local sediment properties and forcing by waves and currents. Numerous predictors for the geometry and hydraulic roughness of ripples exist but, due to their empirical nature, they may fail to properly reflect conditions in the field. Here, measurements of tide and wave generated ripples in a shallow shelf sea are reported. Discrete and continuous methods for the extraction of ripple dimensions from digital elevation models (DEMs) are inter-compared. The range of measured ripple dimensions is quantified and compared to the results of empirical predictors.The repeatability of a measurement for inactive conditions is taken as the precision of measurements of bedform dimensions. The accuracy of measurement is assessed via comparison to predicted dimensions. Results from field data show that the precision of measurements is limited to 10 % of the absolute ripple dimensions. The application of different methods for the detection of ripple heights may result in form roughness heights differing by a factor of up to 2 between the traditional statistical estimate and a full evaluation of the spatial bathymetry.

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Characteristics of instantaneous turbulent events in southern German Bight

Cited by 2 publications

References 4 publications

The Coastal Observing System for Northern and Arctic Seas (COSYNA)

The Coastal Observing System for Northern and Arctic Seas (COSYNA)

Predicted ripple dimensions in relation to the precision of in situ measurements in the southern North Sea

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