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Latest Sedimentology Stories

5e902659def01315c88ad103089a2a6a1
2009-10-20 15:16:24

Openings in Mississippi levees could build new land in sinking delta Diverting sediment-rich water from the Mississippi River below New Orleans could generate new land in the river's delta in the next century. The land would equal almost half the acreage otherwise expected to disappear during that period, a new study shows. For decades, sea-level rise, land subsidence, and a decrease in river sediment have caused vast swaths of the Mississippi Delta to vanish into the sea. The anticipated...

457da6b8a9f2e569b3228c1e6dc28f0b
2009-10-07 08:16:26

The windswept deserts of northern China might seem an odd destination for studying the heavy monsoon rains that routinely drench the more tropical regions of Southeast Asia. But the sandy dunefields that mark the desert margin between greener pastures to the south and the Gobi Desert to the north are a rich source of information about past climates in Asia, says University of Wisconsin-Madison geographer Joseph Mason. Wetter periods allow vegetation to take root on and stabilize sand dunes....

d3ab076adc0fd7c70dc07bdc4887edc31
2009-09-30 09:54:10

Vegetation and sand found to be essential in stream life In a feat of reverse-engineering, Christian Braudrick of University of California at Berkeley and three coauthors have successfully built and maintained a scale model of a living meandering gravel-bed river in the lab. Their findings point to the importance of vegetation to reinforce the banks and, surprisingly, to the importance of sand in healthy meandering river life. The significance of vegetation for slowing erosion and reinforcing...

2009-09-21 13:06:41

A U.S.-led international scientific team says it has determined that Earth's river deltas are sinking due to human activity, many having recent severe flooding. The researchers, led by University of Colorado-Boulder Professor James Syvitski, found 24 of the world's 33 major deltas are sinking, making them increasingly vulnerable to flooding from rivers and ocean storms and putting tens of millions of people at risk. The study concludes the sinking of deltas from Asia and India to the Americas...

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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...


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...

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Word of the Day
bibliopole
  • A bookseller; now, especially, a dealer in rare and curious books.
This word comes from a Greek phrase meaning 'book seller.'
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