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Ecologische modellering op het Koninklijk NIOZ
Overzicht van de bij het NIOZ gebruikte ecologische modellen. Het gaat uitdrukkelijk om mechanistische modellen. Statistische regressie-type modellen worden niet besproken. De modellen zijn ingedeeld op basis van het ecologische organisatieniveau, dat wil zeggen de reeks van individu, via populatie en levensgemeenschap naar ecosysteem. Alle modellen worden kort beschreven in termen van de doelen en het type vragen waarvoor het model geschikt is, als ook de mogelijkheden en beperkingen van het model. Van elk model wordt ook aangegeven hoe de modelcode is opgezet en wat het versiebeheer is.
Algae as a source of fuel for the Dutch aviation sector : a feasibility study : executive summary
This document is the executive summary of an exploratory study about the feasibility and potential benefits of using algae as an alternative energy source for the Dutch aviation sector.
Algae as a source of fuel for the Dutch aviation sector : a feasibility study
This report aims to provide an overview of available knowledge and technologies in the field of algal kerosene production, to identify knowledge gaps and bottlenecks for large-scale commercial application, to give insight in the current feasibility of applying algal kerosene production to the Dutch aviation sector by presenting a case study and provide considerations on future economic feasibility of algal kerosene as a source of fuel.
Measurements on the interaction between dunes and dikes during extreme storm events
This paper presents video-based measurements of morphological experiments in the Vinjé wave basin. The experiments were carried out to study effects of fixed structures on dune erosion. We developed a new measurement method based on video images, that successfully uses the differences between two succeeding images to derive detailed and accurate measurements of the bathymetry. We also developed a method to monitor the position of the dune crest during the experiments by using the variations of the color intensities along a cross-shore transect to determine the dune crest position. Measurements nicely represent the episodic collapsing dune front. The measurements also show an increased erosion near a connection between a dune and a dike compared to an undisturbed dune section. The additional amounts of dune erosion are larger at breaches in a dike and in a dune foot revetment.
Volume-of-fluid model ComFLOW simulations of wave impacts on a dike
ComFLOW is a 3D Volume-of-Fluid (VOF) model to solve the incompressible Navier-Stokes equations including free surface, or to solve the Navier-Stokes equations for two-phase flow problems. The problem statement of the present study reads: Is ComFLOW capable of accurate prediction of wave impacts on (impermeable) coastal structures such as dikes? And, if so, what are the preferred model settings and associated computing times? In this paper, ComFLOW is validated for this purpose by comparison against pressure data as measured in the Delta flume by pressure sensors at dikes.
Models and analysis for flood control systems
Overall goal of the project is to define a framework for Smart Levees, including the development of new models for levee safety monitoring and underlying IT infrastructure. This report contains the findings of the research on: model development, based on IJkdijk experiments and LiveDijk Eemshaven ; real time levee monitoring with improvement of robustness ; remote sensing levee monitoring techniques.
Scaling perspective for a dike monitoring system
This document elaborates on the research that is done to investigate the scaling perspective for a dike monitoring system from a financial perspective. Deals with the different stakeholders and their involvement with a Flood Control System, the parameters influencing the severity of a flood and the consequences a flood has on the economy in first order and second order effects. This is done by making an inventory of the risk of flooding by means of the RAMCAP framework.
Architecture and prototype dike monitoring system
This document defines the solution architecture of a Flood Control System.
Visualisation of levee quality based on sensor data
Describes a vision on a Flood Control System, the requirements for such a system and several visualisation forms. First outlines an envisioned system approach for an integral Flood Control System on top of a variety of dike monitoring systems which will be implemented by water boards in the near future. Then describes an analysis of the Dutch water management situation and defines two scenarios as a basis for requirements gathering for an FCS. Concludes with different views on sensor data for the different stakeholders involved in water management. For different roles in water management a few specific visualisations are designed and implemented.
Added value of sensor streams in dike monitoring systems
Sensor values from various sensors in real levees are coupled to models on dike stability. This is illustrated with two cases: IJkdijk and LiveDijk. The IJkdijk case is representative of a crisis situation. During the controlled experiment failure of the levee was achieved. The LiveDijk Eemshaven case is representative of an operational levee. Sensors were installed to monitor the levee during at least two years in order to get a better understanding of the normal behavior of levees.