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Monitoring swimmer safety

Type: Web Application

Project Phase: Operation and Maintenance

Purpose: Assessing swimmers safety as a result of morphological alterations, such as nourishment

Requirements: Knowledge on hydrodynamics

Relevant Software: Google Earth plug-in, compatible Browser (eg. Google Chrome)




Please note that this website is currently not running, but the principle and method can be applied to monitor other locations.

In the Netherlands, on average five people per year drown in the surf zone and in most cases rip currents play a role in these accidents. Rip currents can form spontaneously and suddenly in the surf zone, but they usually occur when waves break over a sand bar, water “piles up” between the bar and the beach, and flows out through gaps (rip channels) in the sand bar. Offshore directed velocities of over 1 m/s can be reached, which makes a rip current difficult to counter, even for adult swimmers. The website provides daily predictions of swimming conditions for the beach of Egmond. The predictions are based on model computations of nearshore tidal, wind- and wave-driven currents. The prediction system provides lifeguards and beach visitors with information about the swimming conditions, with special attention to the occurrence of rip currents.

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How to Use

The website Swimmer Safety Egmond is accessible through The only requirements for using the website are an internet connection and installation of the Google Earth plug-in (will automatically be indicated when needed). The website is known to encounter problems when accessed with Internet Explorer. For best visualisation, the use of Google Chrome is advised.

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Practical Applications

The muienradar website is in first instance intended for use by lifeguards and other authorities involved with swimmer safety on beaches. The predictions of the nearshore hydrodynamics are yet to be fully validated and more experience with the forecast system needs now to be gained.

  1. Egmond Beach
  2.  Other applications

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