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13 October 2011



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Thailand’s Chao Phraya River forms at the confluence of smaller rivers near Nakhon Sawan and flows past Bangkok to the Gulf of Thailand. Floodwalls meant to contain the river collapsed in downtown Nakhon Sawan, the Bangkok Post reported on October 11, 2011. The aftermath of the burst floodwalls left the city looking like a lake. As rivers overflowed in Thailand, the Tônlé Sab (Tonle Sap) and the Mekong River remained swollen in neighboring Cambodia.
The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured these images on October 11, 2011 (top), and October 8, 2010 (bottom). These images use a combination of visible and infrared light to better distinguish between water and land. Vegetation is green, and clouds are pale blue-green. Water is dark blue.
In 2011, water rests on floodplains between Phitsanulok and Nakhon Sawan. Meanwhile, Tônlé Sab has spread well beyond its boundaries from 2010.
On October 11, CNN reported that an above-average monsoon season in Thailand and Cambodia had killed more than 450 people, and further flooding threatened to inundate the city of Bangkok.
  1. References

  2. Brackenridge, G.R. (2011, October 11). The Flood Observatory. University of Colorado-Boulder. Accessed October 11, 2011.
  3. Bangkok Post. (2011, October 10). Losing the battle against the river. Accessed October 11, 2011.
  4. CNN. (2011, October 11). Thailand flooding leaves hundreds dead, threatens capital. Accessed October 12, 2011.
NASA images courtesy MODIS Rapid Response Team, Goddard Space Flight Center. Caption by Michon Scott.
Instrument: 
Terra - MODIS - NASA