Rivers. Rivers (690 wallpapers)

A river is a natural water stream (watercourse) of considerable size with a natural course along a channel (a natural depression developed by it) from its source down to its mouth and fed by surface and underground runoff from its basin.

Rivers are an integral part of the hydrological cycle. The water in a river is generally collected from surface runoff resulting from precipitation from a certain area bounded by a watershed (river basin), as well as from other sources, such as groundwater reserves, moisture stored in natural ice (during the melting of glaciers ) and snow cover.

In places of natural or artificial obstacles to the flow of the river, reservoirs appear (flowing lakes or artificial seas). Limnology (Greek λίμνε - lake, λόγος - teaching) or lake science is a branch of hydrology, the science of the physical, chemical and biological aspects of lakes and other fresh water bodies, including reservoirs. In turn, rivers are the subject of one of the largest sections of land hydrology - river hydrology or potamology (from other Greek ποταμός - river, λόγος - teaching - literally the science of rivers), which studies the structure of river networks, river flow, morphometry of river pools and so on. As a rule, rivers make their way and flow through zones of least stress and resistance - along tectonic faults.

Since ancient times, the energy of fast rivers and waterfalls has been widely used in human economic activity as a source of renewable energy for the operation of water mills and hydroelectric turbines.

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