Six people have now been confirmed dead and another one is missing following a landslide in the Bajhang District of Nepal on Saturday 4 July 2020. The incident hit the village of Mallesi at about 2.00 am local time, sweeping away seventeen homes, and it was initially feared that as many as 28 people had died. though most of these have now been accounted for. Landslides are a common problem in rural Nepal at this time of year, , associated with the annual monsoon season. Landslides
are a common problem after severe weather events, as excess pore water
pressure can overcome cohesion in soil and sediments, allowing them to
flow like liquids. Approximately 90% of all landslides are caused by
heavy rainfall. The confirmed victims of the landslide have been named as Ramti Devi Jethara, 43, Shanti Kumari Jethara, 16, Prayag Jethara, 13, Ashmita Jethara, 7, Santu Jethara, 15, and Dale Jethara, 81, while the missing person has been identified as Giri Jethara, 20.
Damage caused by a landslide in the village of Mallesi in Bajhang District, Nepal, on 4 July 2020. Lokendra BK/Kathmandu Post.
Monsoons are tropical sea breezes triggered by heating of the land during the warmer part of the year (summer). Both the land and sea are warmed by the Sun, but the land has a lower ability to absorb heat, radiating it back so that the air above landmasses becomes significantly warmer than that over the sea, causing the air above the land to rise and drawing in water from over the sea; since this has also been warmed it carries a high evaporated water content, and brings with it heavy rainfall. In the tropical dry season the situation is reversed, as the air over the land cools more rapidly with the seasons, leading to warmer air over the sea, and thus breezes moving from the shore to the sea (where air is rising more rapidly) and a drying of the climate. This situation is particularly intense in South Asia, due to the presence of the Himalayas. High mountain ranges tend to force winds hitting them upwards, which amplifies the South Asian Summer Monsoon, with higher winds leading to more upward air movement, thus drawing in further air from the sea.
Diagrammatic representation of wind and rainfall patterns in a tropical monsoon climate. Geosciences/University of Arizona.
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