Monitoring the development of the low dynamic intertidal area at Perkpolder



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Figure 1: Perkpolder tidal basin at low tide, September 6, 2016 (Photo: Edwin Paree, RWS/HZ)
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Since June 25th 2015 the Perkpolder tidal basin is flooded twice a day by sea water from the Western Scheldt. The inflow of water has a direct impact on the erosion and sedimentation processes, which give rise to morphological changes. With the inflow of water benthic macro fauna will start colonizing the area and provide the food for birds. At some point in time the vegetation will change and will settle and increase the stability of the deposited sediment. In a three-year project (2016 to 2019) the Centre of Expertise Delta Technology (CoE-DT) monitors the development of the area. CoE-DT has the following partners in this project: Rijkswaterstaat Sea and Delta, Deltares, Wageningen Marine Research, NIOZ Royal Netherlands Institute for Sea Research, and HZ University of Applied Sciences. The research focuses on the morphological and ecological developments, and the groundwater changes in the Perkpolder tidal basin. In addition to developments inside the tidal basin, the effects of saline groundwater on the surrounding agricultural areas are investigated. To reduce the impact of saline water a unique seepage discharge system is constructed around the Perkpolder tidal basin at the landward side of the dyke. Deltares is investigating these effects and the functionality of the seepage discharge system. This research is part of the project although it began in 2012. The monitoring and research plan of the seepage discharge system is described in De Louw (2014); the monitoring and research in the Perkpolder tidal basin is described in Boersema et al. (2015).

Problem statement

Rijkswaterstaat bears the responsibility to realize a new tidal environment at Perkpolder (NCW-eindrapportage, 2008). The goal is to create 75 hectares of low-dynamic tidal nature due to the fact that the habitat has disappeared in the Western Scheldt over the last century as caused by human interference in the Scheldt estuary. In addition, this project provides a unique opportunity to monitor and study the biotic and abiotic changes in an area, that transforms from a freshwater agricultural area into a tidal salt-water natural area. This transition hasn’t been studied much, thus knowledge is very valuable in respect to future tidal restoration projects.

Data and methods

The data and the methods that have been used for the evaluation of the monitoring program are all described in the Perkpolder progress reports:



Referenties
PP Sedimentation balance VN PP Morphological development VN PP Discharge inlet VN PP Changes in height VN PP Morphology and water movement processes VN PP Functioning of seepage system VN PP Seepage of saline water VN PP Saline groundwater in adjacent area VN PP Saline groundwater in tidal basin VN PP Groundwater processes VN PP Seedling survival and lateral expansion VN PP Sediment properties VN PP Seed availability and dispersal VN PP Vegetation development VN PP Vegetation and sediment development VN PP Development of benthic macrofauna VN PP Development of bird population VN PP Benthos en bird development VN PP Monitoring the development of the low dynamic intertidal area at Perkpolder VN PP Goal of the monitoring program VN PP Ontpoldering Perkpolder VN Natuurbescherming Westerschelde VNMonitoring Perkpolder
Over deze afbeelding
HZ University of Applied Sciences
Delta Academy
Rijkswaterstaat, Ministerie van Infrastructuur en Milieu
Projectbureau Zeeweringen
Waterschap Scheldestromen
Provincie Zeeland
Deltares