IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Spatial dike breach: sediment surface topography using photogrammetry
Spatial dike breach: sediment surface topography using photogrammetry
River dikes prevent flooding of the adjoining environment during floods. Due to a lack of dike improvements and extreme
floods, uncontrolled dike overtopping has caused large damages to populated and agricultural areas in the past. The dike
breach process due to overtopping is still poorly understood, despite its importance for evacuation scenarios or fuse plug
planning. Therefore, the previous laboratory research on the parameterization of plane dike breaching due to overtopping
is extended to spatial breaches using novel laboratory experimentation.
A test dike of homogenous non-cohesive sediment and of 0.20 m height, up- and downstream slopes of 1:2 and a crest
length of 0.10 m was positioned in a channel 5.1 m long, 1 m wide and 0.6 m high. A pilot channel with a transversal slope
of 1:2 is used for breach initiation at the front glass wall. To avoid dike failure due to seepage, a drainage is installed at the
downstream dike toe. All tests are run with constant discharge. The dike breach surface is captured with the stereophotogrammetric
AICON measurement system, originally developed for measuring river bed elevations in physical models.
To account for refraction effects due to the curved water surface during dike overtopping, the photogrammetric system was
complemented with a fourth camera to record the flow depth along the channel side wall. In previous tests, the system
accuracy and limitations were determined. The focus of the current research lies in the optimization of the test setup and
first surface measurement results of spatial dike breach tests with mobile bed
File Size : 10,520,092 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 14/08/2015
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