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Abstract
About 260–270 Mt of suspended sediment are discharged annually from the conterminous USA; approximately 69% derives from Gulf rivers (n = 36), 24% from Pacific rivers (n = 42), and 7% from Atlantic rivers (n = 54). Elevated sediment-associated chemical concentrations relative to baseline levels occur in the reverse order of sediment discharges: Atlantic rivers (49%) > Pacific rivers (40%) > Gulf rivers (23%). Elevated trace element concentrations (e.g. Cu, Zn) tend to occur in association with present/former industrial areas and/or urban centres, particularly along the northeast Atlantic coast. Elevated nutrient concentrations occur along both the Atlantic and Gulf coasts, but are dominated by rivers in the urban northeast and by southeastern and Gulf coast “blackwater” streams. Elevated Ca, Mg, K and Na levels appear to reflect local petrology whereas elevated Ti, S, Fe, and Al concentrations are ubiquitous, possibly because they have both natural and anthropogenic sources. Almost all the elevated sediment-associated chemical concentrations/fluxes are lower than worldwide averages.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Annual fluxes of sediment-associated trace/major elements, carbon, nutrients, and sulfur from US coastal rivers |
| Year Published | 2012 |
| Language | English |
| Publisher | International Association of Hydrological Sciences |
| Contributing office(s) | Georgia Water Science Center |
| Description | 10 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Conference publication |
| Larger Work Title | Erosion and sediment yields in the changing environment : proceedings of an IAHS International Commission on Continental Erosion symposium held at the Institute of Mountain Hazards and Environment, CAS-Chengdu, China, 11-15 October 2012 |
| First page | 39 |
| Last page | 48 |
| Conference Title | 2012 International Commission on Continental Erosion (ICCE) International Symposium |
| Conference Location | Chengdu, China |
| Conference Date | October 11-15, 2012 |
| Country | United States |
| Other Geospatial | United States coastal rivers |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |