Quantcast
Last updated on April 18, 2014 at 14:12 EDT

Latest Sedimentology Stories

c06fb16bd5197ef7e963e9a2165b8e721
2009-09-20 13:32:52

24 of world's 33 major deltas sinking, 85 percent have experienced severe flooding recently A new study led by the University of Colorado at Boulder indicates most of the world's low-lying river deltas are sinking from human activity, making them increasingly vulnerable to flooding from rivers and ocean storms and putting tens of millions of people at risk. While the 2007 Intergovernmental Panel on Climate Change report concluded many river deltas are at risk from sea level rise, the new...

a54a99bc23495270de9efb10d6dac1161
2009-08-27 12:26:20

U.S. scientists have developed an alternate theory for the origin of linear dunes on the surface of Titan, Saturn's largest moon, similar to ones on Earth. Louisiana State University Professor Patrick Hesp and U.S. Geological Survey scientist David Rubin said they examined the linear -- or longitudinal -- dunes stretching across the surface of China's Qaidam Basin, finding them composed of sand and some salt and silt. The scientists said the latter two elements make the dunes cohesive or...

602c61ebbb964945eab70e2e3592d4e01
2009-08-25 14:15:00

A new and likely controversial paper has just been published online in Nature Geoscience by LSU Department of Geography and Anthropology Chair Patrick Hesp and United States Geological Survey scientist David Rubin. The paper, "Multiple origins of linear dunes on Earth and Titan," examines a possible new mechanism for the development of very large linear dunes formed on the surface of Titan, Saturn's largest moon. The authors examined the linear "“ or longitudinal "“ dunes that...

7fa6206f1ea60c7f14f140007d7442291
2009-07-22 09:40:00

Scientists from the Alfred Wegener Institute have researched the geology of the seabed in the Labrador Sea on board of the research vessel Maria S. Merian. They have studied the so-called Eirik Drift at the southern tip of Greenland, a structure of several hundred kilometres length formed like a ridge. They discovered a submarine mountain (seamount) at the south-western fringe of their area of investigation that indicates volcanic eruptions during the past few million years.The Eirik Drift...

2009-07-10 13:58:52

U.S. beach goers who play in the sand are at greater risk of diarrhea and gastrointestinal diseases than those who just walk on sand, scientists said. Beach sand can contain indicators of fecal contamination, said Chris Heaney, a postdoctoral epidemiology student at the University of North Carolina, Chapel Hill. Heaney's study showed children run the greatest risk of illness after a day at the beach because they are more likely than adults to dig enthusiastically and get sand in their mouth,...

cbc0ab8229c9e8902ce934506418f8ee1
2009-07-07 16:50:00

The Amazon River originated as a transcontinental river around 11 million years ago and took its present shape approximately 2.4 million years ago. These are the most significant results of a study on two boreholes drilled in proximity of the mouth of the Amazon River by Petrobras, the national oil company of Brazil. A team formed by the Institute for Biodiversity and Ecosystem Dynamics (IBED) of the University of Amsterdam, the University of Liverpool and Petrobras used this new oceanic...

2009-06-09 15:48:40

Despite the great difficulties in quantifying all the environmental and human factors that affect sediment discharge by rivers into the sea, a group of Catalan scientists has compiled data to describe and evaluate the solid sediment discharge from nine river basins in Catalonia "“ the Ter, Foix, Gaia, Bes³s, Llobregat, Francolí, Tordera, Muga, and Fluvia. "This was a slow job, with its fair share of difficulties", Miquel Canals, one of the authors of the study and...

2009-05-12 11:55:00

Sediments released by many of the world's largest river deltas to the global oceans have been changed drastically in the last 50 years, largely as a result of human activity, says a Texas A&M University researcher who emphasizes that the historical information that can be gathered from sediment cores collected in and around these large deltaic regions is critical for a better understanding of environmental changes in the 21st century.Thomas Bianchi, a professor in the Department of...

d8a69f908a45e58e0ea9556efe72a8ed1
2009-04-27 05:55:00

Climate change is now threatening France's Aquitaine coast, which stretches north from the Spanish border to the Gironde River, causing erosion that is endangering coastal communities. In 2006 the European LIFE program identified 13 coastal communities as hotspots for erosion. "There is a lack of sand on the beaches, because of a period of warming -- climate change," says Cyril Mallet, of the French geology and mining research agency BRGM. Climate change means more erosion for the area,...

8e1f3b9eca805445b0cc16b3c9588cd81
2009-04-21 13:50:00

Climate change is resulting in massive drying of some of the world's biggest rivers, according to a report released on Tuesday. Researchers led by Aiguo Dai of the National Center for Atmospheric Research (NCAR) in Boulder, Colorado found that rivers including the Yellow River in northern China, the Ganges in India, the Niger in West Africa, and the Colorado in the southwestern United States are in danger of losing water due to climate change. "Reduced runoff is increasing the pressure on...


Latest Sedimentology Reference Libraries

River Delta
2013-04-18 22:36:25

A river delta is a landform that is created at the mouth of a river, where the river flows into an ocean, estuary, lake, sea, or reservoir. These deltas are built from the deposition of the sediment that is carried by the river as the flow exit’s the mouth of the river. Over a long period of time, this deposition constructs the distinctive geographic pattern of a river delta. The creation of a delta is made up of three core forms: the bottomset, topset, and foreset/frontset. Bottomset...

28_b760796d3dace508242e89fc53d49081
2005-05-26 11:13:08

In geology, a conglomerate is a rock consisting of other stones that have been cemented together. Conglomerates are sedimentary rocks consisting of subangular clasts and are thus differentiated from breccias, which consist of angular clasts. Both conglomerates and breccias are characterized by clasts larger than sand (>2 mm). There are two varieties of conglomerate, defined by texture: paraconglomerates and orthoconglomerates. Paraconglomerates are one of two varieties of conglomerate...

More Articles (2 articles) »