Recente publikaties

Ten reasons to set up sediment budgets for river management

Summary: Rivers are dynamical systems with alternating patterns of sedimentation and erosion. Both sedimentation and erosion may have negative consequences from a perspective of river management. A sediment budget is a most valuable tool for taking measures in river management that deal with sediment dynamics effectively. Drawing-up a sediment budget is time consuming and complicated, but very rewarding in that it strongly increases our understanding of the functional behaviour of a river system and the human impact thereon. The main goal of this article is to provide river managers with arguments in favour of sediment budget studies. This is done by illustrating the benefits of channel sediment budgets for river management using examples from the rivers Scheldt and Rhine. We present 10 reasons for drawing-up sediment budgets for river management: sediment budgets help to: (1) create order in the apparent chaos of data, (2) identify morphological problems, (3) find smart solutions to problems, (4) set research agendas and monitoring strategies, (5) optimize dredging and nourishment strategies, (6) coordinate river management on the basin scale, (7) assess consequences of human interventions, (8) improve numerical models, (9) explain river management to society and (10) train future generations of river managers.

More information: International Journal of River Basin Management, 2017

Social disruption by flooding, a European perspective

Summary: The Dutch National Risk Assessment (NRA) is a methodology to assess the impact and likelihood of all possible threats and hazards that might hit the Netherlands, including a large-scale flood. This methodology addresses all the physical and social aspects that determine social disruption. The NRA has been applied to six European floods in Central and Western Europe. The results show that the NRA impact score for a flooding scenario can be interpreted as a measure for social disruption. Some comments can be made, however. The all hazards approach of the NRA is designed as a robust instrument that enables covering a wide array of threats and disasters. As a result, the NRA in its ‘original’ form offers little room for detailed differences in the consequences of different flooding scenarios. Tailor-made adjustments to the NRA are needed to insure that, for instance, differences in the number of casualties for different floods do not get lost in the bandwidth of the impact criteria.

Socio-psychological factors significantly mark the impact of flooding. This offers opportunities to steer on avoiding or restricting social disruption by flooding by putting an adequate flood risk and crisis communication in place.

The floods in Central Europe in 2002 and 2013 more or less present the lower and upper bounds of the impacts of recent large-scale river floods in Central and Western Europe. Compared with this bandwidth, the impact of a scenario of a worst-case river flood in the Netherlands is not unusual in a European context.

More information: International Journal of Disaster Risk Reduction 21, 2017