This report is part of the different actions foreseen in Work Package 3. ‘Measures: Defining pressures and solutions’ and presents the results of activity 3.1 - Summary of status of current pressures and trends, and analysis of current measure effectiveness. The aim of this work package is to analyse the estuary pressures to improve collective understanding of anticipated pressures and trends, as well as evaluate existing measure effectiveness. Specifically, measures will be evaluated for their delivery of expected benefits and transferability - including similarities among measures to address common problems. Based on the results from this activity, partners will work on designing solutions for their estuaries. Partners already have an indication of themes that require solutions, e.g. using dredged material for flood risk management. The goal of this activity is to form the foundation for others to tackle the issues in other projects or in their strategies or processes. However, it should be kept in mind that not all common trends and pressures identified can be addressed during the project. For activity 3.1, national and regional organizations relevant for estuary management are the key target group. Sometimes these are the partners themselves, sometimes project supporters. Surveys and interviews will primarily involve the target groups in these activities. This report presents the results of this task. It consists of 2 major topics:
• Overview of existing and anticipated/future pressures and trends, based on EU projects and current research.
• Analysis of existing measures’ ability to deliver identified benefits
Task 3.6 Explore solutions as part of a sediment strategy in Scheldt estuary to adapt to the effects of climate change - Description of the mouth of the Western Scheldt, including an overview of the data availability until 2019 (in Dutch)
This overview report is part of an intended knowledge program on sediment management in the mouth of the Western Scheldt. To obtain a better understanding of the sediment dynamics in the mouth and the exchange of sediment with the Western Scheldt, a sediment pilot is included in this knowledge program. This report contains a general description of the mouth and an overview of relevant data available for this area. The inventory defines the basis for the design and disposition of the sediment pilot, including the monitoring program.
In this report attention is paid to, among others, the existing infrastructure, management and maintenance and morphodynamics. In addition, the ecological values and characteristics are discussed on the basis of studies from the past decades. The available ecological datasets are discussed in detail. An overview is also given of relevant data obtained through project measurements or in the context of monitoring programs. Measuring poles and wave buoys are present in both the Dutch and the Flemish part of the estuary. Data relevant for the understanding of hydrodynamics, morphology and sediment balance is discussed in this report.
Since the aim is to provide an overview by bundling the available information, no new studies were carried out for this report. The information included in this report is subject to change, therefore this report has been delivered as version 2019.
The sediment pilot, a nourishment in the mouth of the Scheldt estuary, is included in a research program of Rijkswaterstaat which addresses large scale questions like the effect of accelerated sea level rise in the estuary. In order to define specific goals for the sediment pilot, an inventory was made based on existing knowledge and known knowledge gaps in morphology and ecology of the mouth of the Scheldt estuary. This inventory will be used in defining the location and design of the nourishment and as starting point for a multi-year monitoring and evaluation program.
The goal is to explore solutions as part of a sediment strategy in Scheldt estuary to adapt to the effects of climate change (among others increment of tidal range). Therefore a large scale sediment pilot and accompanying detailed monitoring program is being prepared.
Delatres delivered a baseline report in which all the available knowledge and data on morphology, ecology, existing infrastructure, permits etc. of the mouth of the Western Scheldt is described as well as a report in which the morphological an ecological evaluation of the system are described.
Furthermore we have been investigating possible locations for the actual pilot, and for that goal a number of workshops with morphologists and ecologists fro both Deltares and Rijkswaterstaat was held. A number of promising locations were defined. Based on several criteria (among others government, knowledge, safety) the definitive location for the nourishment was selected. These criteria and the selection is described in a report by Deltares linked above. As part of the selection of the locations for the nourishment, the descent transport trails under different conditions such as wind speed, wind direction and wave height were calculated with Delft 3D and the tool SedTrails. The report in which this research is described is also available for download in the above zip file. Both reports include a summary in English.