Consequences of dike breaches and dike overflow in a bifurcating river system

Currently, the effect of dike breaches on downstream discharge partitioning and flood risk is not addressed in flood safety assessments. In a bifurcating river system, a dike breach may cause overland flows which can change downstream flood risk and discharge partitioning. This study examines how di...

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Bibliographic Details
Published in:Natural hazards (Dordrecht) 2019-05, Vol.97 (1), p.309-334
Main Authors: Bomers, Anouk, Schielen, Ralph M. J., Hulscher, Suzanne J. M. H.
Format: Article
Language:English
Subjects:
Assessments
Bifurcations
Civil Engineering
Discharge
Downstream
Downstream effects
Earth and Environmental Science
Earth Sciences
Environmental Management
Environmental risk
Flood control
Flood risk
Floods
Flow pattern
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Hydrogeology
Natural Hazards
Original Paper
Overflow
Overland flow
Partitioning
Risk
Rivers
Safety
Surface runoff
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Summary:Currently, the effect of dike breaches on downstream discharge partitioning and flood risk is not addressed in flood safety assessments. In a bifurcating river system, a dike breach may cause overland flows which can change downstream flood risk and discharge partitioning. This study examines how dike breaches and overflow affect overland flow patterns and discharges of the rivers of the Rhine delta. For extreme discharges, an increase in flood risk along the river branch with the smallest discharge capacity was found, while flood risk along the other river branches was reduced. Therefore, dike breaches and resulting overland flow patterns must be included in flood safety assessments.
ISSN:0921-030X
1573-0840
DOI:10.1007/s11069-019-03643-y