Intermittent, temporary or seasonal rivers or streams cease to flow every year or at least twice every five years. Such rivers drain large arid and semi-arid areas, covering approximately a third of the earth's surface. The extent of temporary rivers is increasing, as many formerly perennial rivers are becoming temporary because of increasing water demand, particularly for irrigation. Despite inconsistent water flow, intermittent rivers are considered land-forming agents in arid regions, as they are agents of significant deposition and erosion during flood events. The combination of dry crusted soils and the highly erosive energy of the rain cause sediment resuspension and transport to the coastal areas. They are among the aquatic habitats most altered by human activities. During the sum
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| - Intermittent river (en)
- Cours d'eau intermittent (fr)
- Rzeka okresowa (pl)
- Rio intermitente (pt)
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| - Un cours d'eau intermittent (ou temporaire) est un fleuve, une rivière ou un ruisseau qui cesse de couler une partie de l'année ou au moins deux fois tous les cinq ans. En raison de la fréquence accrue d'étiages anormaux, et des défis posés, ce phénomène connait un regain d'intérêt scientifique. (fr)
- Rzeka okresowa, rzeka periodyczna, rzeka sezonowa – rzeka płynąca regularnie w okresie opadów, wysychająca zaś w porze suchej. Rzeki okresowe pojawiają się regularnie podczas każdych opadów, w przeciwieństwie do rzek epizodycznych. Występują zazwyczaj w klimacie zwrotnikowym. Przykładem rzeki okresowej jest Bahr al-Arab w Sudanie, lub rzeka Flinders w Australii. (pl)
- Rio intermitente ou temporário é aquele que durante o período das chuvas (ou "cheias"), apresenta água em seu curso e durante o período de estiagem (ou "secas") desaparece temporariamente. A alimentação desses rios é o escoamento superficial e subsuperficial da água das chuvas. Seu desaparecimento temporário no período de seca porque o lençol freático se torna mais baixo do que o nível do canal do rio, cessando sua alimentação. Nos países árabes os rios intermitentes são conhecidos como Uádis. (pt)
- Intermittent, temporary or seasonal rivers or streams cease to flow every year or at least twice every five years. Such rivers drain large arid and semi-arid areas, covering approximately a third of the earth's surface. The extent of temporary rivers is increasing, as many formerly perennial rivers are becoming temporary because of increasing water demand, particularly for irrigation. Despite inconsistent water flow, intermittent rivers are considered land-forming agents in arid regions, as they are agents of significant deposition and erosion during flood events. The combination of dry crusted soils and the highly erosive energy of the rain cause sediment resuspension and transport to the coastal areas. They are among the aquatic habitats most altered by human activities. During the sum (en)
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| - Intermittent, temporary or seasonal rivers or streams cease to flow every year or at least twice every five years. Such rivers drain large arid and semi-arid areas, covering approximately a third of the earth's surface. The extent of temporary rivers is increasing, as many formerly perennial rivers are becoming temporary because of increasing water demand, particularly for irrigation. Despite inconsistent water flow, intermittent rivers are considered land-forming agents in arid regions, as they are agents of significant deposition and erosion during flood events. The combination of dry crusted soils and the highly erosive energy of the rain cause sediment resuspension and transport to the coastal areas. They are among the aquatic habitats most altered by human activities. During the summer even under no flow conditions the point sources are still active such as the wastewater effluents, resulting in nutrients and organic pollutants accumulating in the sediment. Sediment operates as a pollution inventory and pollutants are moved to the next basin with the first flush. Their vulnerability is intensified by the conflict between water use demand and . Advanced modelling tools have been developed to better describe intermittent flow dynamic changes such as the model. (en)
- Un cours d'eau intermittent (ou temporaire) est un fleuve, une rivière ou un ruisseau qui cesse de couler une partie de l'année ou au moins deux fois tous les cinq ans. En raison de la fréquence accrue d'étiages anormaux, et des défis posés, ce phénomène connait un regain d'intérêt scientifique. (fr)
- Rzeka okresowa, rzeka periodyczna, rzeka sezonowa – rzeka płynąca regularnie w okresie opadów, wysychająca zaś w porze suchej. Rzeki okresowe pojawiają się regularnie podczas każdych opadów, w przeciwieństwie do rzek epizodycznych. Występują zazwyczaj w klimacie zwrotnikowym. Przykładem rzeki okresowej jest Bahr al-Arab w Sudanie, lub rzeka Flinders w Australii. (pl)
- Rio intermitente ou temporário é aquele que durante o período das chuvas (ou "cheias"), apresenta água em seu curso e durante o período de estiagem (ou "secas") desaparece temporariamente. A alimentação desses rios é o escoamento superficial e subsuperficial da água das chuvas. Seu desaparecimento temporário no período de seca porque o lençol freático se torna mais baixo do que o nível do canal do rio, cessando sua alimentação. Nos países árabes os rios intermitentes são conhecidos como Uádis. (pt)
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