نتایج جستجو برای: representative watersheds

تعداد نتایج: 92866  

Journal: :Environmental monitoring and assessment 2011
Andrew K Leight Ward H Slacum Ed F Wirth Mike H Fulton

We examined benthic condition in three small watersheds in the Chesapeake Bay. Characterization of benthic condition was based on the combined measurements of benthic fauna, sediment toxicity, and sediment contaminant loads. Significant differences between watersheds were detected for sediment contaminant concentrations and water quality. The intensity of benthic impairment was greatest in the ...

2017
Kate Horan Robert G Hilton David Selby Chris J Ottley Darren R Gröcke Murray Hicks Kevin W Burton

Over millions of years, the oxidation of organic carbon contained within sedimentary rocks is one of the main sources of carbon dioxide to the atmosphere, yet the controls on this emission remain poorly constrained. We use rhenium to track the oxidation of rock-bound organic carbon in the mountain watersheds of New Zealand, where high rates of physical erosion expose rocks to chemical weatherin...

Journal: :Eos, Transactions American Geophysical Union 2013

2003
W. C. Hession

Stream-bank vegetation significantly influences the morphology of streams in the Piedmont region of the United States. We surveyed the morphology of 26 paired stream reaches in southeastern Pennsylvania, northern Maryland, and Delaware. One member of each pair has a forested riparian zone, whereas the other has a riparian zone composed primarily of grass. The paired reaches are nearly contiguou...

2010
Erin Brooks

The water erosion prediction project (WEPP) model is a physically-based hydrology and erosion model. In recent years, the hydrology prediction within the model has been improved for forest watershed modeling by incorporating shallow lateral flow into watershed runoff prediction. This has greatly improved WEPP’s hydrologic performance on small watersheds with seasonal flows, but the current vers...

2001
Daniel White Kenji Yoshikawa D. Sarah Garland

Pyrolysis-gas chromatography/mass spectrometry (py-GC/MS) is an analytical tool used to produce a ‘‘fingerprint’’ of dissolved organic matter (DOM) in water. Py-GC/MS fingerprinting was used in this research to lend insight into the complex subsurface hydrology of a permafrost-dominated watershed near Fairbanks, AK. Fingerprinting analysis was conducted on groundwater, artesian spring, and stre...

2005

This report reflects the number and boundary delineations of earlier work done by the Minnesota River Assessment Project (MRAP), in which the Minnesota River Basin was divided into thirteen major watersheds. The majority of these watersheds contain the drainage area of only one of the Minnesota River's major tributaries, while the others contain a given reach of the Minnesota River as well as t...

2000

When developing a watershed plan, it is useful to consider how watersheds are configured. The term management unit is used to describe watersheds and their smaller segments. The two management units that will be focused upon in this handbook are the watershed and the subwatershed. A watershed can be defined as the land area that contributes runoff to a particular point along a waterway. A typic...

Journal: :Ecological applications : a publication of the Ecological Society of America 2011
Donald E Weller Matthew E Baker Thomas E Jordan

Watershed analyses of nutrient removal in riparian buffers have been limited by the geographic methods used to map buffers and by the statistical models used to test and quantify buffer effects on stream nutrient levels. We combined geographic methods that account for buffer prevalence along flow paths connecting croplands to streams with improved statistical models to test for buffer effects o...

2004
Yongsheng Ma

Traditionally watersheds were spatial extents that capture rainwater. Recently it has been identified that unless the watersheds are not managed in an integrated sustainable manner, then not only the water resources but also other resources such as vegetation, fertile soil, fauna and flora get depleted. Rational management of upper and lower parts of a watershed is equally important for the sus...

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