Email Document Reference

Enter your email address below and the reference for this document will be sent to shortly from webmaster@ceesi.com.

Title: Calibration Of The Sluice Gates In The Afsluitdijk
Author: Ivo Pothof, Christof Lubbers
Source: Flomeko 2003
Year Published: 2003
Abstract: The Afsluitdijk (literally Closing Dike) has been constructed in 1932. The objectives of the dike were flood protection, an area increase for agriculture and a fresh water reservoir (IJssel Lake). The Afsluitdijk comprises two sluice gate structures: the Stevin sluice gates (15 gates) at the West end of the dike and the Lorentz sluice gates (10 gates) at the East end of the dike. Every low tide with Wadden Sea levels sufficiently below the IJssel Lake level, the gates open and fresh water flows into the Wadden Sea. Rising sea levels, bottom depletion and climate change result in decreased discharge capacity. Therefore an additional sluice structure is planned. The discharge coefficients of each of the 12 m wide gates are still based on physical models from 1922 (Karlsruhe), 1927 and 1933 (Delft) with an estimated uncertainty of 20%. A more accurate determination of the discharge capacity of the sluice gate structures is required to establish the design capacity and associated cost of the new structure. Therefore the Ministry of Transport, Public Works and Water Management, Water Management Direction (RWS) has decided to calibrate the sluice gate structures in the Afsluitdijk, aiming for an uncertainty of 5%. The calibration project is carried out by RWS with support from WL Delft Hydraulics. RWS carries out the water level and velocity measurements and develops software for primary evaluation and time synchronisation of the data. WL Delft Hydraulics has developed the calibration method and the uncertainty evaluation for this particular construction, in close co-operation with RWS. Furthermore, WL has performed statistical analyses. First the global geometry, the typical operation and the possible flow regimes are outlined. Then the instrumentation and approach of the calibration are discussed. The approach requires calibration of the layers near the bottom, the walls and, especially, the water surface. These calibrations are discussed in more detail. Finally an estimate of the total uncertainty of the calibrated discharge through a sluice gate in the Afsluitdijk is given.

In order to prevent spam and automated file downloads for documents within the Measurement Library, please follow the instructions below and then you will be able to email a reference to this article.