River Fisheries
Rivers drain all but the most arid areas of the earth through channels that are regu- lated by physical laws that impose on them certain forms. The ideal form is rarely encountered in practice and represents an end point to which geographic process tend. In general a river may be divided into two principal zones, the steep and fast flowing rhithron upstream and the sluggish and flat potamon downstream. While conditions in an individual system are highly variable along its length, similar reaches of different rivers differ much less even between continents and at different latitudes. All continents have a series of major river systems which consist not only of the river channels but also the swamps, lakes and seasonally flooded lands associated with them. Most rivers are highly conditioned by the patterns of precipitation in their basins. Differences in rainfall intensity throughout the year generate a flood wave that progresses downstream in the majority of rivers (flood rivers), al though singular geographic circumstances may distribute discharge more evenly throughout the year in some systems (reservoir rivers). The number of reservoir rivers is increasing through flow regulation and dam building. Although the basic nature of the river is determined by the rocks over which it flows, the flood regime seasonally modifies the physical and chemical conditions within the river particularly in the tropics. In higher latitudes other features of climate, such as insolation or air temperature exert an increasing influence.
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Format: | Book (series) biblioteca |
Language: | English |
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1985
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Online Access: | https://openknowledge.fao.org/handle/20.500.14283/T0537E http://www.fao.org/3/a-t0537e.HTM |
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dig-fao-it-20.500.14283-T0537E2024-03-16T13:28:04Z River Fisheries River Fisheries R.L. Welcomme;Fisheries and Aquaculture Management Division Rivers drain all but the most arid areas of the earth through channels that are regu- lated by physical laws that impose on them certain forms. The ideal form is rarely encountered in practice and represents an end point to which geographic process tend. In general a river may be divided into two principal zones, the steep and fast flowing rhithron upstream and the sluggish and flat potamon downstream. While conditions in an individual system are highly variable along its length, similar reaches of different rivers differ much less even between continents and at different latitudes. All continents have a series of major river systems which consist not only of the river channels but also the swamps, lakes and seasonally flooded lands associated with them. Most rivers are highly conditioned by the patterns of precipitation in their basins. Differences in rainfall intensity throughout the year generate a flood wave that progresses downstream in the majority of rivers (flood rivers), al though singular geographic circumstances may distribute discharge more evenly throughout the year in some systems (reservoir rivers). The number of reservoir rivers is increasing through flow regulation and dam building. Although the basic nature of the river is determined by the rocks over which it flows, the flood regime seasonally modifies the physical and chemical conditions within the river particularly in the tropics. In higher latitudes other features of climate, such as insolation or air temperature exert an increasing influence. 2023-10-04T14:01:11Z 2023-10-04T14:01:11Z 1985 2020-11-10T22:39:26.0000000Z Book (series) 9251022992 https://openknowledge.fao.org/handle/20.500.14283/T0537E http://www.fao.org/3/a-t0537e.HTM English FAO Fisheries Technical Paper 0429-9345 - T262 FAO 330 |
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David Lubin Memorial Library of FAO |
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English |
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Rivers drain all but the most arid areas of the earth through channels that are regu- lated by physical laws that impose on them certain forms. The ideal form is rarely encountered in practice and represents an end point to which geographic process tend. In general a river may be divided into two principal zones, the steep and fast flowing rhithron upstream and the sluggish and flat potamon downstream. While conditions in an individual system are highly variable along its length, similar reaches of different rivers differ much less even between continents and at different latitudes. All continents have a series of major river systems which consist not only of the river channels but also the swamps, lakes and seasonally flooded lands associated with them. Most rivers are highly conditioned by the patterns of precipitation in their basins. Differences in rainfall intensity throughout the year generate a flood wave that progresses downstream in the majority of rivers (flood rivers), al though singular geographic circumstances may distribute discharge more evenly throughout the year in some systems (reservoir rivers). The number of reservoir rivers is increasing through flow regulation and dam building. Although the basic nature of the river is determined by the rocks over which it flows, the flood regime seasonally modifies the physical and chemical conditions within the river particularly in the tropics. In higher latitudes other features of climate, such as insolation or air temperature exert an increasing influence. |
format |
Book (series) |
author |
R.L. Welcomme;Fisheries and Aquaculture Management Division |
spellingShingle |
R.L. Welcomme;Fisheries and Aquaculture Management Division River Fisheries |
author_facet |
R.L. Welcomme;Fisheries and Aquaculture Management Division |
author_sort |
R.L. Welcomme;Fisheries and Aquaculture Management Division |
title |
River Fisheries |
title_short |
River Fisheries |
title_full |
River Fisheries |
title_fullStr |
River Fisheries |
title_full_unstemmed |
River Fisheries |
title_sort |
river fisheries |
publishDate |
1985 |
url |
https://openknowledge.fao.org/handle/20.500.14283/T0537E http://www.fao.org/3/a-t0537e.HTM |
work_keys_str_mv |
AT rlwelcommefisheriesandaquaculturemanagementdivision riverfisheries |
_version_ |
1799246814426169344 |