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Simulators as hydraulic test facilities at dikes and other coastal structures
The first part of this paper gives a short description of wave processes on a dike, on what we know, including recent new knowledge. These wave processes are wave impacts, wave run-up and wave overtopping. The second part focuses on description of three Simulators, each of them simulating one of the wave processes and which have been and are being used to test the strength of grass covers on a dike under severe storm conditions.
Proceedings of coasts, marine structures and breakwaters
De derde rivier : hoe de grondwaterrivier aanzet tot co-creatie
De IJssel-Vechtdelta (IJVD) krijgt mogelijk te maken met zowel hogere rivierafvoeren, een andere veiligheidsnormering en een grotere fluctuatie van het IJsselmeerpeil als de gevolgen van klimaatveranderingen. De centrale vraag van de SKB-showcase is hoe de ondergrond kan bijdragen aan een duurzame gebiedsontwikkeling van de IJssel-Vechtdelta, waarin het klimaatbestendig maken van het gebied een grote rol speelt. In deze showcase is het inzicht gekomen dat de kansen zichtbaarder worden wanneer het grondwater, dat door de ondergrond stroomt, wordt gezien als ‘de derde rivier’ in het gebied.
Do ecosystem services provide a common language to facilitate participation in water management?
Ecosystem services (ES) are the goods and services provided by ecosystems. The concept relates ecosystems to the social-economic system and thereby explains the dependence of, and impact on, ecosystems by society. One potentially attractive feature of the ES concept is that it might provide a common language to facilitate participatory processes. This feature was explored in a panel session at the Resilience 2011 Conference.
Influence of load interdependencies of flood defences on probabilities and risks at the Bovenrijn - IJssel area, The Netherlands
The effect of upstream failures on failure probabilities and flood risks in other areas is called load interdependence of flood defences. This effect can be both positive and negative: loads on a certain defence can increase and decrease due to failures upstream. In this research a framework was developed which enables the consideration of these interdependencies in a probabilistic framework. The risk estimates and changes in water level probabilities in the considered area show a clear interrelation between loads on different elements of the flood defence system and demonstrate that the effects of dike breaches on loads and risks on other locations cannot be ignored in flood risk analysis.
Opstellen conceptuele modellen voor de Nederlandse grondwaterlichamen
Geeft een overzicht van alle conceptuele modellen (alleen de 3D en 2D figuren) die in het kader van de opdracht van het Ministerie van Infrastructuur en Milieu en de Landelijke Werkgroep Grondwater opgeleverd zijn.
Coastal state indicators to assess the morphological development of the Holland coast due to natural and anthropogenic pressure factors
This paper tries to close the existing gap between scientists and coastal managers by describing the morphological development of the Holland coast through an indicator approach. In particular, three indicators have been chosen to quantify three different coastal functions, i.e. the short-term safety, the medium term safety and the available space for nature and recreation. The dynamics of the indicators have been quantified in relation to the external pressure factors determining those changes. Those relations provide simple rules of thumb which can be used by coastal managers to quantify the effects of specific actions (e.g. implementation of nourishments), to assess the impact of changes in the natural forcing (e.g due to climate change), or as a basis for cost-benefit analysis.
Waar of niet waar? : over veronderstellingen rond regelbare drainage
Regelbare drainage wordt in veel (beleids)nota’s benoemd als veelbelovende maatregel om te voldoen aan de diverse wateropgaven (KRW, GGOR, WB21 en omgaan met klimaatverandering). Ook in het nationale Deltaprogramma, in het bijzonder het Deelprogramma Zoetwater, lijkt RD een majeur onderdeel van de regionale maatregelpakketten te gaan uitmaken als belangrijke klimaatadaptieve maatregel. Dit verdient op zijn minst nuancering. Dit artikel voorziet een aantal veronderstellingen rond RD van een oordeel.
Modelling storm response on gravel beaches using XBeach-G
Despite the clear societal importance of gravel beaches and barriers in protecting coastal areas from flooding, there are currently no reliable numerical models for predicting the morphological response of gravel beaches to storm events. This paper synthesises the results of a research project (NUPSIG) aimed at reducing this shortfall through an integrated research approach, involving field experimentation, comprehensive beach monitoring and innovative numerical modelling. In particular, the authors introduce a storm impact model for gravel beaches and barriers developed during the project (XBeach-G), present a brief validation of the model using field data and describe a user-friendly graphical user interface for the model. Finally, the model is applied in two case studies to demonstrate the use of the model in decision-making processes related to coastal flooding and beach maintenance.
Velocity profiles in suction tubes
The velocity profiles in suction tubes were measured relative to adjustments in the compartment of the suction tube. For this, the repeatability was determined using six reference measurements. Especially one compartment adjustments had an influence on the velocity profile. Due to an extra pump, removed between the measurements, a broken weld on the pitot frame, and the pitot frame shifting as a result, not all measurements can be compared to the reference.