Sentences with phrase «percent of the sediment»

This reduction represents 69 percent of all sediments flowing out the Andes and 64 percent of the entire Amazon sediment supply and is expected to extend to the Amazon river main channel, impacting the entire central floodplain and delta region.

«In the big picture of the site, that's something like two percent of the sediment,» he said.

Not exact matches

The difference between the two is the FILTRATOR compound is a filter aid that really just eliminates the particles that are in the oil and the sediment, whereas the filter powder not only takes out the particulates but removes almost 100 percent of the free fatty acids.»

But contrary to earlier predictions, one can not simply raise the slope by, say, 2 percent while decreasing the water depth by 2 percent and see the same pattern of sediment transport.

One percent or less of the contaminated sediment that's moving offshore every year means things aren't going to change very fast,» Buesseler says.

Diversion sites on the open coast retain only 5 to 30 percent of incoming sediment.

Since sediment carried by Bayou Lafourche 1,200 to 600 years ago only contained about 20 percent sand, but an abundance of mud, the researchers suggest that land building can be maximized by gearing muddy diversions toward vegetated areas rather than to capture sandy deposits along the open waters of the Gulf of Mexico.

«In lowland, sand - bed rivers like the Amazon, the Mississippi — you name it — only about 40 to 60 percent of the energy is used to transport sediment downstream,» he said.

«In the Yellow River, well over 95 percent of the energy is available to move sediment.»

The microbial communities in these sediments include aggregates of methane - oxidizing archaea called ANME (for ANaerobic MEthanotrophs) and sulfate - reducing bacteria (SRB) that live together symbiotically and help to remove some 80 percent of the methane released from ocean sediments.

The models predicted erosion would increase by at least 100 percent in a quarter of western U.S. watersheds between the start of the 21st century and 2050, a surprisingly large increase in the amount of sediment to enter local streams, according to Sankey.

Nearly 99 percent of them outside Antarctica reside in sediments along continental slopes, more than 500 meters underwater in midlatitudes, 300 meters in higher latitudes.

Research in 2008 led by oceanographer Natalia Shakhova, now at the University of Alaska Fairbanks, estimated the thawing shelf could release a 50 - gigaton pulse of methane from hydrates over 10 years — about 8 percent of the methane stored in the shelf's sediments.

Rather, excess CO2 returns toward baseline at a multitude a different rates, with chemical equilibration in the ocean occurring over decades (depending on depth), ocean carbonate buffering through sediment dissolution requiring centuries to millennia, and eventual restoration of carbonate sediment levels by terrestrial weathering occurring over hundreds of thousands of years — a long «tail» that can account for as much as 20 to 40 percent of CO2 excess in the estimates described by David Archer et al in CO2 Atmospheric Lifetimes.

Marine sediment cores cover a broader area — nearly 70 percent of the Earth is covered in oceans — but they only give tiny hints about the climate over the land.

A World Resources Institute report on coral reefs in the Caribbean notes that 35 percent of these reefs are threatened by sewage discharge, water - based sediment, and pollution from fertilizer and that 15 percent are threatened by pollution from cruise ship discharges.

d Numbers of total dinoflagellate cysts per gram sediment (green circles), concentration of sea - ice related dinoflagellate species Impagidinium pallidum in percent of total dinoflagellate cyst taxa (blue circles) and accumulation rates of Operculodinium centrocarpum (olive - colored graph) indicative of warm Atlantic Water inflow42.