File:Guardians (Thames Barrier) (31964565254).jpg
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Summary
editDescriptionGuardians (Thames Barrier) (31964565254).jpg |
The Thames Barrier in London is one of the largest movable flood barriers in the world. The Environment Agency runs and maintains the Thames Barrier as well as London’s other flood defences. The Environment Agency receives information on potential tidal surges from weather satellites, oil rigs, weather ships and coastal stations. They can forecast dangerous conditions up to 36 hours in advance, and will close the barrier just after low tide, or about 4 hours before the peak of the incoming surge tide reaches the barrier. They get information from a range of mathematical computer models that forecast expected sea and river levels. This is supplemented by data from the Met Office and real-time information provided by the UK National Tidegauge Network. This hydrological and meteorological data is fed into the control room every minute from a wide network of tide, river, pressure and wind gauges. The decision to close, or not, is based on a combination of 3 major factors: 1) The height of the tide (usually a spring tide) measured at the Thames Estuary 2) The height of the tidal surge, which naturally accompanies each tide 3) The river flow entering the tidal Thames, measured as it passes over Teddington Weir |
Date | |
Source | Guardians (Thames Barrier) |
Author | Phil Dolby |
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This image was originally posted to Flickr by dolbinator1000 at https://flickr.com/photos/126654539@N08/31964565254. It was reviewed on 2 December 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
2 December 2021
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current | 04:08, 2 December 2021 | 5,149 × 2,560 (1.86 MB) | JrandWP (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | SONY |
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Exposure time | 36/1 sec (36) |
F-number | f/16 |
ISO speed rating | 100 |
Date and time of data generation | 12:18, 9 February 2017 |
Lens focal length | 45 mm |
Horizontal resolution | 240 dpi |
Vertical resolution | 240 dpi |
Software used | Adobe Photoshop Lightroom 6.8 (Macintosh) |
File change date and time | 20:09, 9 February 2017 |
Exposure Program | Manual |
Exif version | 2.3 |
Date and time of digitizing | 12:18, 9 February 2017 |
APEX shutter speed | −5.169925 |
APEX aperture | 8 |
APEX brightness | −2.65078125 |
APEX exposure bias | 0 |
Maximum land aperture | 4.96875 APEX (f/5.6) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Color space | sRGB |
Focal plane X resolution | 2,323.6931818182 |
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Focal plane resolution unit | 3 |
File source | Digital still camera |
Scene type | A directly photographed image |
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White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 67 mm |
Scene capture type | Standard |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Lens used | DT 18-55mm F3.5-5.6 SAM II |
Date metadata was last modified | 20:09, 9 February 2017 |
Unique ID of original document | 5956C70801738F2A450DECE36C8BE05E |
IIM version | 4 |