Storm surge barrier

Two open segment gates of the eastern barrier

A flood barrier , sometimes inaccurate as flood defense called, is a barrage in an estuary , a bay or a channel whose moveable goals only in the event of a storm surge shut off the water from the water influx from the sea. When the water levels are not dangerous, it allows the water currents such as the runoff of the headwater and the tides to pass as freely as possible.

use

This prevents flooding inland and in port areas. The erection of such structures shortens the dike line, which means that additional construction and maintenance measures are no longer necessary. If shipping is to be possible even when the gates are closed, a lock has been created in addition to the closable flow openings.

Storm surge barriers are mainly found in tidal waters where, on the one hand, the tidal influx of water is ecologically important, and on the other hand, threatening situations occur relatively often due to the coincidence of astronomical tides and storm surges. There are also storm surge barriers at river mouths and bays with no significant tidal range .

Demarcation

Storm surge barriers should not be confused with the weir systems that exist at many estuaries further up. They limit the tidal range and thus the estuary . On the one hand, they have the function of a sluice and shield the inland water that follows upstream from the astronomical tides and from storm surges. In addition, they have the function of a barrage as a weir , guaranteeing sufficient water levels and thus the diving depths of the inland waterway . Examples are the Emswehr and Emsschleuse in Herbrum , the Bremen Weser weir , the Geesthacht barrage in the Elbe , as well as the lock and weir system in the north field of the Eider .

Storm surge barriers on tidal waters

Germany

• On the Ems :
  • Leda barrage , possibly the oldest in Europe
  • Ems barrier
• On the Weser :
  • Geeste barrage
  • Huntes barrier
  • Lesum lock
  • Ochtum barrage
• On the Elbe
  • Barrage at Billwerder Bay
  • Abbenfleth barrier
  • Ilmen lockout
  • Lühes Barrage
  • Ruthen current barrier
  • Swing barrier
  • Disturbance barrier

England

• Thames
  • Thames Barrier

Netherlands

• Rhine-Maas-Scheldt Delta
  • Dutch IJssel barrage , the oldest in the Netherlands
  • Maeslantkering
  • Oosterscheldekering

United States

• New England
  • Fox Point Hurricane Barrier
  • New Bedford Harbor Hurricane Barrier
• New Orleans
  • Seabrook floodgate
  • Gulf Intracoastal Waterway West Closure Complex

Storm surge barriers without tides

Germany

• Ryck
  • Greifswald barrage

Italy

• Venice lagoon
  • MO.SE project

Russia

Flood gates on the Petersburg Embankment

• Gulf of Finland / Neva estuary
  • Petersburg Embankment

Web links

Commons : Barrages  - collection of images, videos and audio files

Individual evidence

1. ↑ Lower Saxony State Agency for Water Management, Coastal Protection and Nature Conservation (NLWKN): List and descriptions of the barriers  ( page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.  
2. ↑ http://www.wsa-toenning.wsv.de/bauwerke/nordfeld/
3. ^ Elbe hydroponic landscape: Billwerder Bucht barrage
4. ↑ Archived copy ( memento of the original from April 23, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.