•   Monitoring
•   Forecasting
•   Action & Mitigation
•   ICT & Organisation

DETERMINATION OF DIKE STRENGTH USING REMOTE SENSING (RSDYK)

The strength of water-retaining structures (e.g. dykes) is determined by calculations based on sampling and testing programs and supported by field observations. In the calculations the subsurface is reduced to a schematized model of the dyke and subsurface layers to which properties are assigned. The strength of water-retaining structures (e.g. dykes) is determined by calculations based on sampling and testing programs and supported by field observations. In the calculations the subsurface is reduced to a schematized model of the dyke and subsurface layers to which properties are assigned.  Remote sensing techniques may be able to establish properties of the subsurface directly or may be used to establish relative changes in space and time, in the structure and properties of a dyke. Changes in strength due to, for example, a changed groundwater regime during flooding, may be established by remote sensing

This project is done to establish the possible correlations between terrestrial remote sensing techniques, geological information of the surrounding subsurface, geophysical details of a dike and the quality of peat dikes. The RSDYK project is directed to dikes in The Netherlands and conditions that occur in The Netherlands. The project is done at two locations; one in Reeuwijk and one near Amsterdam. Geophysics, boreholes, and Dutch Cone Penetration (CPT) tests have been done to investigate the subsurface of the dike.

The project RSDYK2008 formulated part of the requirements based on literature review. The project RSDYK2010 covered the start of the project and literature study. RSDYK2011 and RSDYK2012 continued on the basis of RSDYK2010. Eventually, by finishing the PhD. research in 2014, the project will result in:

• A methodology to use remote sensing techniques in the context of dyke quality estimation over large areas in times of flooding;
• A system of software routines that will improve the inspection and forecasting of dyke quality and will make it more efficient.

 

Data:
Participants: ITC, Royal Haskoning, Fugro, Stichting IJkdijk
Stakeholders: Gemeente Reeuwijk, Hoogheemraadschap Rijnland