Sentences with phrase «of coastal sediment»

Not exact matches

While there are management solutions to stabilizing the landscape, those solutions are not without challenges, Goodbred said, but the study notes that systematically breaching embankment sections to allow for delivery of sediment to the coastal sea might at least partially reduce problems.

The team's research, supported by the National Science Foundation and a NASA graduate fellowship, began with a study of coastal lake sediments in Japan to establish long - term records of tsunami flooding.

Since the first project of its kind in the U.S. at Coney Island, N.Y., in 1922, coastal managers have used beach nourishment — essentially importing sand to replace sediment lost through storms or erosion — to restore damaged beaches, but it is laborious and expensive.

To further refine the probability estimates, they took into account past (prior to recorded history) tsunamis — evidence of which is preserved in geological layers in coastal sediments, volcanic tephras, and archeological sites.

The biggest known bacterial cells, belonging to the coastal sediment bacterium Thiomargarita namibiensis, are 7,500 times the size of ultramicrobacteria.

Pushed by the natural motion of wind and ocean currents — often over long distances — the litter is present in oceans worldwide, as well as in sea floor sediment and coastal sands.

COAWST combines models of ocean, atmosphere, waves and sediment transport for analysis of coastal change.

The flume will also provide new insights into natural processes such as sediment transport along shorelines and the mechanical properties of coastal soils, López Lara says.

The combination of powerful storms and the sediment shortfall produced what U.S. Geological Survey coastal scientist Patrick Barnard called a «worst - case scenario» that «may be an indication of what's to come.»

And the conundrum for coastal engineers is that sediment can only come in large quantities from the processes of erosion — especially from fast - eroding cliff faces.

In coastal protection, it can mean, for instance, artificially building beaches that absorb the power of storm waves, or encouraging the natural forces that raise and extend a coastline, including salt marsh, by ensuring a supply of sediment.

«This research underscores the necessity for future coastal developments to consider the adverse effects of sediment on fish and reef ecosystems,» adds Dr Wenger.

Sediment is the key to managed retreat and all forms of soft coastal defence.

Marshes and other natural coastal bulwarks can grow taller as seas rise, protecting against floods, but most of them need sediment - rich waters to do so.

«Once the oil, because of high tides or high winds, gets into the coastal wetland, it gets trapped in the sediment,» notes Héctor M. Guzmán of the Smithsonian Tropical Research Institute in Panama, who studied the effects of the 1986 spill off Panama.

One is geomorphological: erosion provides the sediment that builds up the natural coastal defences of other areas of coastline, by forming marshes or beaches, shingle bars or mud flats.

Warming and the seas — both on the rise Those ancient samples of sediment from 10 coastal wetlands in North Carolina provide some of the best evidence that sea - level rise closely follows warmer temperatures, Rahmstorf says.

The northern third of the delta is lowering at the rate of about 4 to 8 mm per year due to compaction of strata underlying the plain, seismic motion, and the lack of sufficient new sediment to re-nourish the delta margin being eroded by Mediterranean coastal currents.

Large uncertainties were caused by the GMSLR scenario and sediment size; however, the minimum projected rate of beach loss was 18 % in the near future, and this rate of loss is expected to have significant implications for coastal management.

Prior to the industrial age, decomposing plant materials in coastal waters and sediments likely led to the release of carbon dioxide.

Professor Pierre Friedlingstein from the University of Exeter said: «Carbon storage in sediments in these rivers and coastal regions could present a more secure environment than carbon stored in soil on land.

Fellow Melissa Garren from the Scripps Institution of Oceanography at the University of California - San Diego collects sediment samples beneath coastal milkfish (Chanos chanos) farms in Bolinao, Republic of the Philippines.

Scott has recently taken up an adjunct research position at the Centre for Tropical Water and Aquatic Ecosystem Research, James Cook University where he is currently: (i) investigating the importance of enhanced larval survival and strong «local» reef interconnectedness as a triggering agent for primary outbreaks of crown ‐ of ‐ thorns starfish on the central GBR, and (ii) assessing potential improvements in the health of coastal seagrass and dependent dugong populations due to targeted reductions in fine sediment loads from the GBR catchment.

Jorgenson, M.T., and J. Brown, 2005: Classification of the Alaskan Beaufort Sea Coast and estimation of carbon and sediment inputs from coastal erosion.

Linking RPO results from riverine and coastal marine sediments will enhance our understanding of what material survives transport from the terrestrial environment to the ocean.

In addition, stronger storms may also lead to greater coral damage due to increased flooding events, associated terrestrial runoff of freshwater and dissolved nutrients from coastal watersheds, and changes in sediment transport (leading to smothering of corals).

Magnetite production and transformation in the methanogenic consortia from coastal riverine sediments — Shiling Zheng — Journal of Microbiology

(2012) OSL dating of mixed coastal sediment (Sylt, German Bight, North Sea).

The term feeder bluff has been applied to certain coastal cliffs or headlands that provide sediment to down - current beaches as the result of wave action on the bluff.

The assessment considered the impacts of several key drivers of climate change: sea level change; alterations in precipitation patterns and subsequent delivery of freshwater, nutrients, and sediment; increased ocean temperature; alterations in circulation patterns; changes in frequency and intensity of coastal storms; and increased levels of atmospheric CO2.

In their study of sediments from the Black Sea, Eckert et al. (2013, p. 431 in this issue of Geology), make this step by providing, for the first time, a basin - wide reconstruction of the evolution of the chemocline in this silled coastal basin over the Holocene.

David, I havent been keeping up with all the PETM research, but I do recall that individual plankton recovered from Bass River, New Jersey show a single step CIE. Due to the high sedimentation rate of coastal fluvial systems, Bass River sediments are consistent with a much shorter duration of organic carbon release during the PETM (estimated as less than 500 years).

The tertiary source of CaCo3 is sediments themselves — in both coastal areas and open water — as fined grained sediment, shell and coral.

New Zealand coastal geomorphologist Paul Kench, of the University of Auckland's School of Environment, and colleagues in Australia and Fiji,... found that reef islands change shape and move around in response to shifting sediments, and that many of them are growing in size, not shrinking, as sea level inches upward.

Mappings of the geochemistry and magnetic susceptibility of detrital sources in the watershed of the lagoon and from the coastal barriers were undertaken in order to track the terrestrial or coastal / marine origin of sediments deposited into the lagoon.

Detailed impacts, however, will vary strongly from region to region and coast to coast and therefore can not be easily generalized, as changing mean and extreme coastal water levels depend on a combination of near shore and offshore processes, related to climatic but also non-climatic anthropogenic factors, such as natural land movement arising from tectonics, volcanism or compaction; land subsidence due to anthropogenic extraction of underground resources; and changes in coastal morphology resulting from sediment transport induced by natural and / or anthropogenic factors.

Barrier islands like the one's that stretch along the coast of Georgia are formed from deposition of sediments coming from Georgia's rivers, and sand being deposited along the coastal side of the island by the longshore drift.

report that ocean sediment cores containing an «undisturbed history of the past» have been analyzed for variations in PP over timescales that include the Little Ice Age... they determined that during the LIA the ocean off Peru had «low PP, diatoms and fish,» but that «at the end of the LIA, this condition changed abruptly to the low subsurface oxygen, eutrophic upwelling ecosystem that today produces more fish than any region of the world's oceans... write that «in coastal environments, PP, diatoms and fish and their associated predators are predicted to decrease and the microbial food web to increase under global warming scenarios,» citing Ito et al..

A fraction of this carbon is released as CO2 by rivers and lakes to the atmosphere, a fraction is buried in freshwater organic sediments and the remaining amount (~ 0.9 PgC / year) is delivered by rivers to the coastal ocean.

What kind of emphasis should be put on trying to re-naturalize river systems and coastal areas, i.e. building wetlands, removing dams that prevent sediment from reaching barrier islands etc., and could this practice actually be better for coastal areas as opposed to hard infrastructure?

Seasonal distribution of nitrifying bacteria and rates of nitrification in coastal marine sediments

Organic matter diagenesis at the oxic / anoxic interface in coastal marine sediments, with emphasis on the role of burrowing animals

Bioturbating shrimp alter the structure and diversity of bacterial communities in coastal marine sediments