Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experimental study of the early stages of a dam-break flow over fixed and mobile beds
The dam-break flow is an extreme example of a severe transient flow, often associate with catastrophic flood events. In a real case it is a very complex flow, involving not only many different time and space scales but also a complex fluid-bed interaction that will affect the propagating wave celerity. The need for studies on this kind of flow arises mainly from the risk assessment needed for existing, or to-be build, dams. The definition of the flooded areas and their evolution with time constitutes a valuable information for the authorities' evacuation plans conception. Numerical models are often used to obtain the required information about the dam-break flow propagation. However for an improved modelling it is important to know the physics of the flow. This can be acquired by means of small scale models in the laboratory, where the effect of the different variables can be isolated and analysed. The information thus obtained can be used to gain a better comprehension of the dam-break flow, but also to obtain an experimental results data base that can be used to calibrate and validate existing numerical and analytical models. The present study is devoted to the experimental analysis of the dam-break flow, with special emphasis on the initial stages of the dam-break flow. Rather than focus only in the macro-scale variables, i.e., water level evolution and wave celerity, the present study deals with the point-wise velocity measurements within the dam-break flow. For velocity measurements different techniques are used. Two of them based on imaging techniques (PIV and PTV), and a third one based on the acoustic Doppler Effect (UVP). These techniques allowed for a space and time description of the dam-break flow velocity field. The measurements were carried considering different flow heights and bed types. The dam-break flow over beds of sediments is here analysed and the velocity field of both water layer and sediment layer measured simultaneously. A two-layer numerical model is than used and tested against the ...
Experimental study of the early stages of a dam-break flow over fixed and mobile beds
The dam-break flow is an extreme example of a severe transient flow, often associate with catastrophic flood events. In a real case it is a very complex flow, involving not only many different time and space scales but also a complex fluid-bed interaction that will affect the propagating wave celerity. The need for studies on this kind of flow arises mainly from the risk assessment needed for existing, or to-be build, dams. The definition of the flooded areas and their evolution with time constitutes a valuable information for the authorities' evacuation plans conception. Numerical models are often used to obtain the required information about the dam-break flow propagation. However for an improved modelling it is important to know the physics of the flow. This can be acquired by means of small scale models in the laboratory, where the effect of the different variables can be isolated and analysed. The information thus obtained can be used to gain a better comprehension of the dam-break flow, but also to obtain an experimental results data base that can be used to calibrate and validate existing numerical and analytical models. The present study is devoted to the experimental analysis of the dam-break flow, with special emphasis on the initial stages of the dam-break flow. Rather than focus only in the macro-scale variables, i.e., water level evolution and wave celerity, the present study deals with the point-wise velocity measurements within the dam-break flow. For velocity measurements different techniques are used. Two of them based on imaging techniques (PIV and PTV), and a third one based on the acoustic Doppler Effect (UVP). These techniques allowed for a space and time description of the dam-break flow velocity field. The measurements were carried considering different flow heights and bed types. The dam-break flow over beds of sediments is here analysed and the velocity field of both water layer and sediment layer measured simultaneously. A two-layer numerical model is than used and tested against the ...
Experimental study of the early stages of a dam-break flow over fixed and mobile beds
01.01.2013
Hochschulschrift
Elektronische Ressource
Englisch
DDC:
627
New experimental dataset for partial dam-break floods over mobile beds
| Taylor & Francis Verlag | 2018
Flow Turbulence over Fixed and Weakly Mobile Gravel Beds
| British Library Online Contents | 2000
Vertical and Horizontal Two-Dimensional Numerical Modeling of Dam-Break Flow over Fixed Beds
| British Library Conference Proceedings | 2011
1-D Model for Dam-Break Waves over Mobile Beds
| British Library Conference Proceedings | 2004
2D Morphodynamic Modelling of Dam-break Flows Over Mobile Beds
| British Library Conference Proceedings | 2009