Rain shadow in the context of "Mu River (Irrawaddy)"


Rain shadow in the context of "Mu River (Irrawaddy)"

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⭐ Core Definition: Rain shadow

A rain shadow is an area of significantly reduced rainfall behind a mountainous region, on the side facing away from prevailing winds, known as its leeward side.

Evaporated moisture from bodies of water (such as oceans and large lakes) is carried by the prevailing onshore breezes towards the drier and hotter inland areas. When encountering elevated landforms, the moist air is driven upslope towards the peak, where it expands, cools, and its moisture condenses and starts to precipitate. If the landforms are tall and wide enough, most of the humidity will be lost to precipitation over the windward side (also known as the rainward side) before ever making it past the top. As the air descends the leeward side of the landforms, it is compressed and heated, producing Foehn winds that absorb moisture downslope and cast a broad "shadow" of dry climate region behind the mountain crests. This climate typically takes the form of shrub–steppe, xeric shrublands, or deserts.

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👉 Rain shadow in the context of Mu River (Irrawaddy)

Mu River (Burmese: မူးမြစ်, MLCTS: mu: mrac; IPA: [mú mjɪʔ]) is a river in upper central Myanmar (Burma), and a tributary of the country's chief river, the Irrawaddy. It drains the Kabaw valley and part of the Dry Zone between the Ayeyarwady to the east and its largest tributary the Chindwin River to the west. It flows directly north to south for about 275 km (171 mi) and enters the Ayeyarwady west of Sagaing near Myinmu.

Its catchment area above the Kabo weir is 12,355 square kilometres (4,770 sq mi). River flow and rainfall are both seasonal and erratic, at its lowest from January to April, rising sharply during May and June, and high from August to October. Because the Mu lies within the Dry Zone in the rain shadow of the Arakan Mountains, it receives scanty summer monsoon rainfall with a total streamflow of 350 millimetres (14 in). An old popular expression in Burmese goes thus: Ma myinbu, Mu myit htin (မမြင်ဖူး မူးမြစ်ထင်) - If you haven't seen a river before, you'd think the Mu is it. It may also be called Mu Chaung (creek) rather than Mu Myit (river) by some.

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