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 aquatic ecosystem conservation. Advanced modelling tools have been developed to better describe intermittent flow dynamic changes such as the tempQsim model.
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Intermittent river in the context of Stream
A stream is a continuous body of surface water flowing within the bed and banks of a channel. Depending on its location or certain characteristics, a stream may be referred to by a variety of local or regional names. Long, large streams are usually called rivers, while smaller, less voluminous and more intermittent streams are known, amongst others, as brook, creek, rivulet, rill, run, tributary, feeder, freshet, narrow river, and streamlet.
The flow of a stream is controlled by three inputs – surface runoff (from precipitation or meltwater), daylighted subterranean water, and surfaced groundwater (spring water). The surface and subterranean water are highly variable between periods of rainfall. Groundwater, on the other hand, has a relatively constant input and is controlled more by long-term patterns of precipitation. The stream encompasses surface, subsurface and groundwater fluxes that respond to geological, geomorphological, hydrological and biotic controls.
Intermittent river in the context of Ghaggar-Hakra River
The Ghaggar-Hakra River (IPA: [ɡʰəɡːəɾ ɦəkɾaː]) is an intermittent river in India and Pakistan that flows in force only during the monsoon season. The river is known as Ghaggar before the Ottu barrage at 29°29′15″N 74°53′33″E / 29.4875°N 74.8925°E, and as Hakra downstream of the barrage in the Thar Desert. In pre-Harappan times the Ghaggar was a tributary of the Sutlej. It is still connected to this paleochannel of the Sutlej, and possibly the Yamuna, which ended in the Nara River, presently a delta channel of the Indus River joining the sea via Sir Creek.
The Sutlej changed its course about 8,000–10,000 years ago, leaving the Ghaggar-Hakra as a system of monsoon-fed rivers terminating in the Thar Desert. The Indus Valley Civilisation prospered when the monsoons that fed the rivers diminished around 5,000 years ago, and a large number of sites from the Mature Indus Valley Civilisation (2600–1900 BCE) are found along the middle course of the (dried-up) Hakra in Pakistan. Around 4,000 years ago, the Indus Valley Civilisation declined when the monsoons further diminished, and the Ghaggar-Hakra dried up, becoming a small seasonal river.
Intermittent river in the context of El Arish
Arish or El-Arish (Egyptian Arabic: العريش, romanized: al-ʿArīš, Egyptian Arabic pronunciation: [elʕæˈɾiːʃ]) is the capital and largest city of the North Sinai Governorate of Egypt, as well as the largest city on the Sinai Peninsula, lying on the Mediterranean coast 344 kilometres (214 mi) northeast of Cairo and 45 kilometres (28 mi) west of the Egypt–Gaza border. Its estimated population was 204,391 in 2023.
In antiquity and the Early Middle Ages, the city was known as Rinokoroura (Ancient Greek: Ῥινοκόρουρα, Coptic: ϩⲣⲓⲛⲟⲕⲟⲣⲟⲩⲣⲁ). ʻArīsh is located at the mouth of Wadi al-Arish, a 250 kilometres (160 mi) long ephemeral watercourse. The Azzaraniq Protectorate is on the eastern side of ʻArīsh.
Intermittent river in the context of Tijuana River
The Tijuana River (Spanish: Río Tijuana) is an intermittent river, 120 mi (195 km) long, near the Pacific coast of northern Baja California state in northwestern Mexico and Southern California in the western United States. The lower reaches of the river are heavily polluted with raw sewage from the city of Tijuana, Mexico.