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Tag: River

Example of enhanced water levels produced from river ice, Liard River, Canada
The lower curve shows the correspondence between river flow and water levels under open-water conditions. The much greater maximum water levels possible under ice-jam conditions are illustrated by the upper curve. The t...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
The Cryosphere, world map
Snow and the various forms of ice - the cryosphere - play different roles within the climate system. The two continental ice sheets of Antarctica and Greenland actively influence the global climate over time scales of mi...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Poverty and cholera in Kwazulu-Natal January 2001
Data and maps on poverty, sanitation, safe and clean water and the incidence of cholera were used to help contain the spread of cholera in the Kwazulu Natal province in January 2001. Poverty and cholera data sets showed ...
29 Nov 2007 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Comparison of global river nitrogen export from natural ecosystems, agricultural systems, and sewage effluents, 1975 and 1990
Nutrient loading is projected to become an increasingly severe problem, particularly in developing countries. Nutrient loading already has major adverse effects on freshwater ecosystems and coastal regions in both indust...
30 Nov 2007 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Millennium Ecosystem Assessment conceptual framework
International demand for timber may lead to a regional loss of forest cover, which increases flood magnitude along a local stretch of a river. Similarly, the interactions can take place across different time scales. Acti...
30 Nov 2007 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
World population living in river basins with severe water stress
Increasing water scarcity with population increase.
01 Mar 2010 - by Giulio Frigieri
Population living in river basins where freshwater withdrawal exceeds 40 per cent of renewable resources
Population by region was calculated averaging the results forecasted by the scenarios of the GEO-4 report using the WaterGAP modeling.
01 Mar 2010 - by Giulio Frigieri
Logging in the Congo river basin forest
China is the largest consumer of logs from the DRC, buying near 38% of the roundwood produced in official statistics in 2008 (Ministère des Eaux, Forêts, Chasses et Pêches du DRC, 2009). However, the official numbers onl...
17 Mar 2010 - by Riccardo Pravettoni
Threats to coral reefs in Eastern Africa
Human land use along coasts and in major river basins can threaten coral reefs through toxic material inputs to coastal ecosystems. This graphic shows the areas of low, medium and high estimated threats to coral reefs on...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Dates of river ice break-up in the Arctic
Dates of river ice break-up in the Arctic
21 Mar 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Unalakleet community in Alaska
Location and Climate: Unalakleet is a small coastal community on Norton Sound, at the mouth of the Unalakleet River, 395 miles northwest of Anchorage, Alaska. Unalakleet has a sub-Arctic climate with considerable influen...
21 Mar 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Dates of river ice freeze-up in the Arctic
Presenting the relative dates of river freeze-up in the Arctic and the climatic condititions surrounding that, thus outlining the relative changes in temperature and conditions throughout the circumpolar Arctic.
21 Mar 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Dissolved phosphate levels: concentrations at river mouths
Phosphorus is naturally present in water, primarily as inorganic and organic phosphates. Phosphates can enter aquatic environments in several ways: from the natural weathering of minerals in the drainage basin, from biol...
26 Jan 2009 - by Phillippe Rekacewicz, February 2006
Water Scarcity Index
Water overuse is damaging the environment in many major basins. High overuse tends to occur in regions heavily dependent on irrigated agriculture, such as the Indo-Gangetic Plain in south Asia, the North China Plain and ...
13 Sep 2009 - by Philippe Rekacewicz, February 2006
The water cycle
Environment water transport system. The water cycle consists of precipitation, vapour transport, evaporation, evapo-transpiration, infiltration, groundwater flow and runoff. Figure 1 explains the global water cycle, ill...
01 Feb 2008 - by Philippe Rekacewicz , UNEP/GRID-Arendal
Freshwater use by sector at the beginning of the 2000s
The agricultural sector is by far the biggest user of freshwater. Analysis indicates that: - In the United States, agriculture accounts for some 49% of total freshwater use, with 80% of this volume being used for irriga...
26 Jan 2009 - by Philippe Rekacewicz (Le Monde diplomatique)
The disappearance of the Aral Sea
The demise of the Aral Sea in central Asia was caused primarily by the diversion of the inflowing Amu Dar’ya and Syr Dar’ya rivers to provide irrigation water for local croplands. These diversions dramatically reduced th...
26 Jan 2009 - by GRIDA
Nitrate levels: concentrations at river mouths
Nutrients are essential to life. In aquatic systems, nitrogen and phosphorus are the two nutrients that most commonly control the growth of aquatic plants, algae and bacteria. Nitrogen and phosphorus are considered to be...
26 Jan 2009 - by Philippe Rekacewicz
Tigris and Euphrates rivers fragmentation
It has been predicted that access to water will create conflict between countries. In Africa, central Asia, west Asia and the Americas, some countries are already arguing fiercely over access to rivers and inland seas, a...
26 Jan 2009 - by Philippe Rekacewicz
Level of river fragmentation and flow regulation
River fragmentation - The interruption of a river’s natural flow by dams, inter-basin transfers or water withdrawal - is an indicator of the degree to which rivers have been modified by man (Ward and Stanford, 1989, and ...
26 Jan 2009 - by Philippe Rekacewicz (Le Monde diplomatique), March 2006
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