Drought

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  • drought
definition
  • A period of abnormally dry weather sufficiently prolonged so that the lack of water causes a serious hydrologic imbalance (such as crop damage, water supply shortage) in the affected area.
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Abstract from DBPedia
    A drought is a period of below-average precipitation in a given region, resulting in prolonged shortages in its water supply, whether atmospheric, surface water or ground water. A drought can last for months or years, or may be declared after as few as 15 days. It can have a substantial impact on the ecosystem and agriculture of the affected region and harm to the local economy. Annual dry seasons in the tropics significantly increase the chances of a drought developing and subsequent bush fires. Periods of heat can significantly worsen drought conditions by hastening evaporation of water vapour. Many plant species, such as those in the family Cactaceae (or cacti), have drought tolerance adaptations like reduced leaf area and waxy cuticles to enhance their ability to tolerate drought. Some others survive dry periods as buried seeds. Semi-permanent drought produces arid biomes such as deserts and grasslands. Prolonged droughts have caused mass migrations and humanitarian crises. Most arid ecosystems have inherently low productivity. The most prolonged drought ever in the world in recorded history occurred in the Atacama Desert in Chile (400 Years).

    旱魃(かんばつ)とは、雨が降らないなどの原因である地域に起こる長期間の水不足の状態である。旱は「ひでり」、魃は「ひでりの神」の意味である。いずれも常用漢字ではないため干ばつと表記する場合がある。 旱魃の被害を総じて旱害(かんがい)と呼ぶ。干害とも書き、これは旱害の書き換え語でもある(従前から存在する同音同義語であり、新しい表記ではない)。 旱魃はその地域の水資源の存在量と人間の水需要がアンバランスになることによって発生するため、純粋な物理現象とはいえない。

    (Source: http://dbpedia.org/resource/Drought)

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