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113 resultaten
Development and test of usability of an operational crop growth system for farmers : TKI Farmers'App (final report)
The goal of this project was to demonstrate the possibility to develop a real-time forecasting system for crop production, enabling water boards, farmers and the insurance broker to improve their services and possibly reduce costs. The setup of both the Aa & Maas and Vechtstromen models within the “Grow with the Flow” operational system shows promising initial results. The value of the system was demonstrated by comparing model results with measurements in the field during the growing season. We successfully finalized the system and demonstrated the possibilities of application for a wet (2016), ‘normal’ (2017), and dry (2018) season.
The development of a GIS tool to assess the changes in the riverine landscape for the ecological quality of the river Rhine in the Netherlands
Large-scale physical modelling of wave damping of brushwood mattresses
To determine the wave damping characteristics of floating brushwood mattresses, large scale physical modelling in the Deltares Delta flume was performed.
Surficial sediment erodibility from time-series measurements of suspended sediment concentrations : development and validation
Numerical models of fine sediment transport depend on different approaches to parameterize the erosion properties of surficial sediment strata. These properties, namely the critical shear stress for erosion and the erosion rate coefficient, are crucial for reproducing the short-term and long-term sediment dynamics of the system. Methods to parameterize these properties involve either specialized laboratory measurements on sediment samples or optimization by model calibration.
Progress report 2010 on the nourishment on the Galgeplaat : morphological and ecological developments, 15 months after the construction
The Galgeplaat is very susceptible to erosion and as a result its elevation is being continually lowered. It was decided to carry out a nourishment on the Galgeplaat. The goal of the nourishment is to stop the loss of intertidal area (temporarily). The nourishment is being extensively monitored for a period of three years.
Some ecological consequences of a projected deep reservoir in the Kabalebo river in Suriname
Best practice guidelines for the integrated planning and design of economically sound and environmentally friendly roads in the Mekong floodplains of Cambodia and Viet Nam
These guidelines are based on the review of local practice, international experience, and case study results. They are intended for use by professionals and organisations involved in road planning and design in the Mekong floodplains, as well as those involved in environmental and integrated assessments of road developments in the Mekong basin or structural developments in this basin in general. The set consists of three guidelines: Best practice guidelines for integrated planning of road development and rehabilitation ; Best practice guidelines for environmental assessment of road development and rehabilitation ; Best practice guidelines for technical design of road development and rehabilitation.
Mud dynamics in the Ems-Dollard, phase 3 : scenarios for improvement
Rijkswaterstaat has initiated the project "Onderzoek slibhuishouding Eems-Dollard" (Research on mud dynamics in the Ems-Dollard). This project explores the reasons for the historic increase in turbidity in the Ems Estuary, as well as possible measures to improve the water quality in the area. This report presents results of model scenario studies conducted to explore the effect of different measures to improve the conditions in the Ems Estuary. The objective of these measures is to decrease the turbidity and increase primary production. Four different measures were chosen to be analysed in model scenario studies: 1. Disposal of dredged sediment in the North Sea ; 2. Sediment extraction from ports (and disposal on land) ; 3. Creation of intertidal area to increase sedimentation (also called 'adaptive poldering') ; 4. Restoration of channel depth in the Oost Friesche Gaatje and Emden Fairway.
Assessment of the nourishment efficiency using a Bayesian modelling approach : case study : North Holland
In this study, a Bayesian probabilistic model has been implemented to assess the effects of nourishments on a number of coastal indicators using, as input, data defined at Jarkus transect level for the North Holland coast. As indicators for short- and medium- term safety, probability of failure, MKL, and MDL have been selected.
Life Cycle Analysis for four different ground improvement techniques
BioGrout is a method developed by SmartSoils Deltares to strengthen soil. It is based on Microbial In situ Calcite Precipitation (MICP). BioGrout 1st generation, using the ureaseenzyme, was developed in 2004. In 2008 the development of 2nd generation BioGrout, based on denitrification, was started. A Life Cycle Analysis (LCA) of the two BioGrout methods was produced, in order to determine their environmental impact and to investigate which steps in the process have the highest impact and should be improved. Also an LCA is made of two traditional ground improvement techniques (gel injection and jet grouting) in order to compare the two new methods with the traditional methods.