The effects of changes to erosion and sedimentation patterns will depend on whether the change results in an increase or decrease in sediment availability.
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The Nile in Africa is one such example where the construction of the Aswan High Dam in has changed the total flow and sediment load. In a regional overview of land-based sources and activities affecting the marine, coastal, and associated freshwater environments in the Wider Caribbean Region, almost all the countries have included high levels of sediments in the coastal zone among the major environmental problems they face UNEP Even though most of the outflow of the Amazon is going eastward across the Atlantic, an important quantity flows northward around the coast of the continent into the Eastern Caribbean Caribbean Sea Ecosystem Assessment Team The Magdalena River is the largest river discharging directly into the Caribbean Sea and it discharges more sediment for each square kilometer of its catchment area than any of the other large rivers along the Caribbean and Atlantic coasts of South America the rate is t km-2 year-1 Caribbean Sea Ecosystem Assessment Team The sediment load from the Magdalena River has had a strong impact on coastal ecosystems and during the past 50 years the Magdalena River has come under increasing environmental stress Caribbean Sea Ecosystem Assessment Team This stress was brought by the economic development of Colombia which caused an escalating population density within the drainage basin.
Increasing deforestation, mining and poor agricultural practices have all contributed to an increased rate of upland erosion and water pollution. Increased sediment loads in Barbacoas Bay Colombia has impacted the El Rosario Islands, a 68 km 2 coral-reef ecosystem as well as the largest coral reef on the Colombian Caribbean coast, a system covering km 2 between the San Bernardo and Fuerte Islands, north and south from the Morrosquillo Gulf.
According to the Caribbean Sea Ecosystem Assessment Team , the decline in fisheries catches from 63 t in to 7 t in , is another indication of the environmental degradation caused by reduced water quality. Along the rivers of the Orinoco Basin there is dredged waste on the riverbank which is a major environmental concern since it inhibits drainage into the river UNEP et al b.
South Asian river basins in a 1.5 °C warmer world
The seasonal change of outflow from the Orinoco River influences the concentrations of sediments in the north Venezuelan coastal waters Gomez The Mississippi River is one of the world's major river systems in size, habitat diversity, and biological productivity and is the largest river draining in the Gulf of Mexico. Most of the river and its floodplain have been extensively modified by humans and much of the watershed is intensively cultivated USGS In most countries of the Wider Caribbean Region forested land is declining with the highest rate in Central America FAO and during the past four decades the largest increase of arable land in the world took place in Latin America and the Caribbean.
Predictions for indicate a continuation of this increase FAO Erosion is manifested in the whole Caribbean region, and causes are related to a higher frequency and intensity of tropical storms, sea level rise, the deficit in the sand inputs, and tectonic phenomena. Antrophogenic causes include sand mining, destruction and occupation of dunes by tourist facilities, construction of marinas, incorrect location of coastal protection infrastructure, and the damage to coral reefs and seagrass beds, important sources of production of marine carbonated sand.
Sand mining and beach erosion are issues of great concern in countries such as St.
Marine geology projects
Kitts and Nevis, Saint Lucia, and St. Growing coastal populations and the growth of coastal tourism in the Wider Caribbean Region are two additional factors contributing to increased sedimentation.
This is particularly true for the Danube River Basin DRB , which consists of highly dynamic ecological and political systems. The river basin of the ca.
Humans have lived in it from at least the Mesolithic period onwards. The DRB is the most international river basin in the world.
The DRB hosts a plethora of environmental problems; environmental legacies abound; and conflicts over resource use are particularly intense in its riverine landscapes. The Danube plays an important part for the development of a climate-friendly trans-European transportation network.
Rivers are neither cultural nor natural spaces. They are socio-natural sites, where the interplay of humans with the environment has taken place over long periods. Communities have had and still have to deal with cultural and natural legacies of past interventions. The current situation of the DRB cannot be understood — and hence a sustainable future not be planned — unless the common past of nature and humans is known.
River Basin Sediment Systems - Archives of Environmental Change | Taylor & Francis Group
European research and higher education funds do not generally foster interdisciplinary co-operation. In particular, the humanities have hitherto not been stimulated to bring their expertise into the interdisciplinary portfolio of knowledge necessary for a transition to sustainability. Danube:Future is based on the fact that planning a sustainable future is impossible without a sound knowledge of the social as well as the natural past.