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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.
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.
Stabilization of peat by infiltration of reactants - a feasibility study : infiltration of silica biopolymer suspension in peat
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.
Tools for medium- and long-term prediction of nourishments effects
In this study the effect of different nourishment designs at the medium- (years, kilometres) and large- (decades to centuries, tens to hundreds of kilometres) scale was investigated by means of numerical tools and data analysis. The effects were evaluated by looking at a number of morphological indicators of simple use for coastal managers: the MKL position, the dune foot position and the beach width.
Literature study Dutch lower shoreface
This report describes an inventory of existing knowledge, field data and models of the Dutch lower shoreface. The Dutch lower shoreface is defined as the area between the upper shoreface (regular and dominant wave action) and the continental shelf (only wave action during storm events). This is roughly the zone between the outer breaker bar (about NAP -8 m) and the NAP -20 m depth contour. This literature review is the first phase of the Coastal Genesis 2.0, Lower Shoreface project in support of Dutch coastal policy, in which the definition of the offshore boundary of the coastal foundation plays an important role. This report gives a system description of the Dutch lower shoreface morphodynamics, defines the state-of-the-art knowledge and outlines further research activities, new field measurements and numerical modelling in particular.
Assessment Zealand water level measurement network : creating a method for evaluating measurement networks using hydrodynamic models
There is an increasing demand for information on the state of water systems. A procedure was developed for optimizing a monitoring system that is based on data model integration (DMI) techniques. Using the optimisation procedure, a set of twelve measurement stations was expected to produce a DMI based monitoring system that satisfied an accuracy of RMSE of 3 to 5 cm at the Dutch stations.
Kustlijnzorg project : statistical modelling of the impact of nourishments on the beach and dune systems
A stochastic model has been developed, based on the historical trend analysis of long-term yearlyrecordedJarkus-data, in order to describe the long-term dynamics of Coastal State Indicators (e.g. MCLposition). The model includes mathematical representations of the most relevant phenomena: long-termtrend, influence of nearshore bar dynamics and impact of nourishments.
Modelling the carrying capacity of the Oosterschelde : Deltakennis 2010
The integrated ecosystem model for the Oosterschelde has improved in several ways. As a result, modelled primary productions now show an acceptable fit with measurements. In comparison to previous results, however, the fit with measured nutrient and chlorophyll concentrations has somewhat deteriorated. Also, results suggest that the existing grazer pressure in the Oosterschelde may be larger than was predicted before.