Non intrusive density measurements in gravity currents interacting with an obstacle

• Autorzy: Adduce Claudia , Maggi Maria Rita , De Falco Maria Chiara

Identyfikatory

DOI

10.1007/s11600-021-00709-z

• Języki publikacji: EN

Abstrakty

EN

Gravity currents are flows produced by a density difference between two fluids. Non-intrusive density measurements, based on image analysis, are employed to measure the instantaneous width averaged density fields of lock-release gravity currents. The developed technique uses dye concentration as a tracer. For each pixel of the acquired images, a calibration procedure is applied to relate the concentration of dye, uniformly distributed in the experimental tank, and the greyscale. Two calibration techniques with nine-image and two-image calibration curves, respectively, are employed to evaluate the instantaneous density fields of a gravity current with and without a bottom obstacle. The two different calibration curves affect the measurement results, i.e. instantaneous density fields, front propagation, current area and mixing. The image analysis using a nine-image calibration curve is found to give better results compared to the technique with a two-image calibration curve. The analysis performed shows how the image analysis based on a nine-image calibration curve is a more suitable technique for the study of the gravity currents dynamics and the associated mixing, which are strongly affected by the presence of a bottom obstacle.

Słowa kluczowe

EN

gravity currents; image analysis technique; density fields; bottom obstacle

PL

prądy grawitacyjne; komputerowa analiza obrazu; pola gęstości

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2022
• Tom: Vol. 70, no 5
• Strony: 2499--2510
• Opis fizyczny: Bibliogr. 34 poz.

Twórcy

autor

Adduce Claudia

• Department of Engineering, Roma Tre University, Via Vito Volterra 62, 00146 Rome, Italy
• Institute of Marine Sciences, National Research Council, Rome, Italy

• https://orcid.org/0000-0002-0734-9569

autor

Maggi Maria Rita

• Department of Engineering, Roma Tre University, Via Vito Volterra 62, 00146 Rome, Italy

autor

De Falco Maria Chiara

• Department of Engineering, Roma Tre University, Via Vito Volterra 62, 00146 Rome, Italy

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Uwagi

PL

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).