On how defining and measuring a channel bed elevation impacts key quantities in sediment overloading with supercritical flow

• Autorzy: Eslami Hasan , Yousefyani Hooshyar , Yavary Nia Mohsen , Radice Alessio

Identyfikatory

DOI

10.1007/s11600-022-00851-2

• Języki publikacji: EN

Abstrakty

EN

The manuscript presents the results of an aggradation experiment performed in a laboratory channel with supercritical flow. The channel was fed with a stationary sediment load exceeding the transport capacity of the flow in the initial condition, thus inducing sediment aggradation and an increase of the bed slope. The experiment is part of a laboratory campaign mimicking sediment overloading in mountain rivers, a process that can determine increased hydraulic risk levels at key spots. A crucial issue in measuring sediment aggradation is the definition and determination of the bed elevation, this issue being quite relevant in experiments with a relatively large transport capacity, where a thick bed-load layer exists and hinders the possibility to determine with confidence a reference bed elevation. The determination of the bed elevation, in turn, impacts the quantification of a number of properties, including the initial sediment transport capacity of the flow, temporal scales of the aggradation process, water depth and Froude number. The manuscript presents a sensitivity analysis of the results to two extreme definitions for the bed elevation: the first one locates the bed at the upper edge of the bed-load layer, while the second one at the lower edge of the bed-load layer where the particles do not move. The presentation of the two alternatives is focused on the experimental methods they use, consistently with the intent of the special issue. Furthermore, it is demonstrated that the definition of the bed elevation also has a major impact on numerical models of the process. The experimental results have been reproduced numerically, demonstrating that the calibration parameters returning a best fit are also impacted significantly by how the bed is defined. The preferred definition for analyzing an experimental campaign is locating the bed below the bed-load layer.

Słowa kluczowe

EN

bed load transport; channel aggradation; bed definition; image-based measurements; sediment transport capacity; aggrading front celerity; equivalent roughness

PL

transport ładunków

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2022
• Tom: Vol. 70, no 5
• Strony: 2511--2528
• Opis fizyczny: Bibliogr. 27 poz.

Twórcy

autor

Eslami Hasan

• Department of Civil and Environmental Engineering, Politecnico Di Milano, Milan, Italy

autor

Yousefyani Hooshyar

• Department of Civil and Environmental Engineering, Politecnico Di Milano, Milan, Italy

autor

Yavary Nia Mohsen

• Department of Civil and Environmental Engineering, Politecnico Di Milano, Milan, Italy

autor

Radice Alessio

• Department of Civil and Environmental Engineering, Politecnico Di Milano, Milan, Italy

• https://orcid.org/0000-0001-5024-3199

Bibliografia

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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).