Wave propagation under influence of currents

The present study aims to assess the prediction of wave penetration into tidal inlets under ambient current in SWAN. The performance of SWAN in the modelling of wave-current interaction was studied for two field cases, namely Port Phillip Bay Heads, Australia, and the Amelander Zeegat in the Dutch Wadden Sea. In-situ wave observations were...

Storm hindcast January 2010 - Analysis of the application of radar current data for hindcast purposes

One of the unresolved issues regarding the performance of SWAN in the Wadden Sea is the penetration of North Sea waves into the tidal inlet systems. For accurate modelling of the complex processes in these areas, the underlying water level and current fields should be of good quality. The hydrodynamic modelling to generate water level and...

3D GPR surveys on Friesland dike

In May 2007 Roadscanners did a series of Ground Penetrating Radar (GPR) surveys on two dikes in the Netherlands, one in Friesland and the other in Hellegatsdam. The purpose of these surveys was to determine pavement layer thickness for safety assessment reasons and to produce seed thickness values for FWD back calculation. Another goal was to...

Beach Wizard: A data model assimilation method for nearshore bathymetry and coastal state indicator estimation

Report on ground-penetrating radar techniques for seawall asphalt pavement investigations

This report discusses possibilities of using radar technology in asphalt pavement investigations in several types of pavement. The main focus is on highly porous asphalt (OSA) and watertight asphalt concrete (WAB), as used in Dutch seawalls. The determinations of layer thickness as well as layer integrity are important goals. The asphalt...

Feasibility of improving storm surge forecasts by assimilation of radar altimeter data

A stochastic control approach to flight path monitoring

In the Programme for Harmonised Air Traffic management Research in Eurocontrol (PHARE) Medium Term Scenario, a number of Advanced Tools are described which must be developed in order to increase Air Traffic Control capacity and the flight efficiency of aircraft while keeping at least the same level of safety. One of these Tools is the Flight...

Reconstruction of current profiles from HF radar surface current measurements by inverse modeling

Crop identification with microwaves (SLAR-data of 1985)

Microwaves (i.e. X-band SLAR) have been used in The Netherlands for many years within ROVE to identify agricultural crops. This report deals with data acquisition, preprocessing and classification of agricultural crops in The Netherlands using the Dutch Digital SLAR. With internal and external calibration of the instrument satisfactory results...

Test results of image segmentation algorithm on the RESEDA system (in Dutch)

The image segmentation algorithm has been tested by means of imagery of agricultural areas and forests acquired by airborne SLAR as well as Seasat SAR. The accuracy was determined for segmentation without any postprocessing and with emphasis on estimation of area and field average. Besides, the (positive) influence of segmentation on...

A method and measures to evaluate trackers for air traffic control

The general setup of the evaluation of a radar tracking algorithm in a civil ATC-system has been considered from an operational point of view. Both the present and the potential future use of trackdate has been taken in account. The result is a method to evaluate trackers for ATC on the basis of live-traffic data, under the assumption that a...

Comparison of a jump-diffusion tracker with a Kalman tracker: an evaluation with emphasis on air traffic control

A sophisticated starting point for a probabilistic approach to the radar tracking problem is a Markov jump-diffusion model for the aircraft dynamics, its control and the radar measurements. From nonlinear filtering theory, a closed form description of the evolution of the conditional distribution of this Markov process can be obtained. This jump...