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Following is a set of pins which are all connected to the topic Flooding and Droughts. Each pin contains a brief description of what is displayed by the pin and a preview image linked to a high-resolution print on flickr.
Chennai is located on the south-eastern coast of India on a flat coastal plain and is the fourth largest city with over 7 million inhabitants. The city relies heavily on annual monsoon rains to replenish the four water reservoirs that represent the main water resources for the public and extensive automotive industry in the region. Mismanagement of the water resources, combined with 3 years of deficient monsoon rainfall seasons prior to the event caused a dramatic depletion of the water reservoirs related article. Additionally, the groundwater aquifer was drained beyond its usual recovering capability threshold because residents reverted to groundwater extraction via bore wells. The three Sentinel-2 L2A-based Moisture index images from before, while and after the drought, show the desiccation of the Red Hills Reservoir over the heat period in 2019 with a clearly retreating water line. Further reading
Before/During/After the drought (Moisture Index)
Bangladesh is known as one of the most flood-prone countries in the world. Every year the monsoon, a weather phenomenon caused by changes in wind direction and transportation of moist air, usually produces heavy rainfall from June through September. In early July 2019, heavy rains and consequently overflowing rivers flooded numerous districts in northern Bangladesh, forcing nearly 200,000 people to flee their homes (related article). Additionally, on the night of 17 July 2019 the Jamuna River broke through a flood bank and swamped at least 40 villages, aggravating the effects of the monsoon period in the region. A timely identification of flooded areas is essential for an effective flood response. The inundation maps, utilizing Short wave infrared composite (SWIR) and Normalized Difference Water Index (NDWI), show the difference between the usual landscape state and effects of the 2019 Bangladesh floods and facilitate natural disaster management assessment.
- Before the flood (SWIR)
- After the flood (SWIR)
- Before the flood (NDWI)
- After the flood (NDWI)
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