They removed sediment samples for analysis from the middle of the cores.
Distinct roles were observed for each wetland size class: small headwater wetlands effectively removed sediment, medium-sized mid-reach wetlands retained phosphorus, while large wetlands primarily stored and attenuated long-period hydrologic flows.
Under the plan, which officials say could cost more than $700 million, General Electric will remove sediments from a 40-mile stretch of the river north of Albany.
The samples were cleaned by removing sediments finer than 63 μm.
The engineering viability of removing sediments deposited in the lake should be examined by numerical modeling before implementing a drawdown flushing.
Employing these multiple approaches we show that spatially variable roughness patterns are partly a consequence of the ability of flowing ice not only to smooth the bed but also to redistribute and remove sediments, and to do this along-flow.
To resolve this problem, and in the meantime improve the quality of the surrounding environment, we propose a system, based on the integration of both classical and ecological engineering techniques, which is able to: (1) refurnish satisfactory reservoir volumes by removing sediments from the bottom; (2) provide the possibility of reusing these sediments; and (3) increase local biodiversity.
Sediments settling on corals may increase disease prevalence indirectly through increased stress and energy expenditure required to remove sediments [28], which could make them more susceptible to infections by microbial pathogens, and/or directly if sediments act as disease reservoirs [23].
Furthermore, due to their influence on basal resources e.g. removing sediments and exposing periphyton, they affect other primary consumers [ 32].
Billy Causey, the Southeast regional director of NOAA's National Marine Sanctuary Program in Key West, Florida, encourages dive shops, dredge operators (who remove sediments to create channels in the sea), and other businesses to avoid resilient reefs when bleaching risk is high.
