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Full-Text Articles in Physical Sciences and Mathematics
Tracking The Fate Of A High Concentration Groundwater Nitrate Plume Through A Fringing Marsh: A Combined Groundwater Tracer And In Situ Isotope Enrichment Study, Cr Tobias, Sa Macko, Iris C. Anderson, Elizabeth A. Canuel, Jw Harvey
Tracking The Fate Of A High Concentration Groundwater Nitrate Plume Through A Fringing Marsh: A Combined Groundwater Tracer And In Situ Isotope Enrichment Study, Cr Tobias, Sa Macko, Iris C. Anderson, Elizabeth A. Canuel, Jw Harvey
VIMS Articles
A groundwater plume enriched in (15)NO(3)(-) was created upgradient of a mesohaline salt marsh. By measuring the changes in concentration and isotopic enrichment of NO(3)(-), N(2)O, N(2), NH(4)(+), and particulate organic nitrogen (PON) during plume transport through the marsh, in situ rates of dissimilatory nitrate reduction to ammonium (DNRA) and denitrification (DNF) were estimated, as well as N storage in the reduced N pools. For groundwater discharge within the top 10 cm of marsh, NO(3)(-) removal was 90% complete within the 50 cm of marsh nearest the upland border. The peak NO(3)(-) loss rate from the plume ranged from 208 …
Quantifying Groundwater Discharge Through Fringing Wetlands To Estuaries: Seasonal Variability, Methods Comparison, And Implications For Wetland-Estuary Exchange, Cr Tobias, Jw Harvey, Iris C. Anderson
Quantifying Groundwater Discharge Through Fringing Wetlands To Estuaries: Seasonal Variability, Methods Comparison, And Implications For Wetland-Estuary Exchange, Cr Tobias, Jw Harvey, Iris C. Anderson
VIMS Articles
Because groundwater discharge along coastal shorelines is often concentrated in zones inhabited by fringing wetlands, accurately estimating discharge is essential for understanding its effect on the function and maintenance of these ecosystems. Most previous estimates of groundwater discharge to coastal wetlands have been temporally limited and have used only a single approach to estimate discharge. Furthermore, groundwater input has not been considered as a major mechanism controlling pore-water flushing. We estimated seasonally varying groundwater discharge into a fringing estuarine wetland using three independent methods (Darcy's Law, salt balance, and Br- tracer). Seasonal patterns of discharge predicted by both Darcy's Law …
The Paraguay-Paraná Hidrovía: Protecting The Pantanal With Lessons From The Past: Large-Scale Channelization Of The Northern Paraguay-Paraná Seems To Be On Hold, But An Ongoing Multitude Of Smaller-Scale Activities May Turn The Pantanal Into The Next Example Of The “Tyranny Of Small Decisions”, Johan F. Gottgens, James E. Perry, Et Al
The Paraguay-Paraná Hidrovía: Protecting The Pantanal With Lessons From The Past: Large-Scale Channelization Of The Northern Paraguay-Paraná Seems To Be On Hold, But An Ongoing Multitude Of Smaller-Scale Activities May Turn The Pantanal Into The Next Example Of The “Tyranny Of Small Decisions”, Johan F. Gottgens, James E. Perry, Et Al
VIMS Articles
Because it is one of the most inaccessible places on earth, this large, rich ecosystem has remained relatively untouched. There is, however, increasing evidence that this area is threatened by a number of activities, including mining, illegal hunting and fishing, indiscriminate use of fire, agricultural development, and deforestation. Careless use of mercury in gold mining, particularly in the northern Pantanal, may have resulted in acute and chronic ecosystem disruption (Hylander et al. 1994, Nogueira et al. 1997, Leady and Gottgens 2001). Wildlife poaching and live animal trade are widespread although hard to quantify. During six months in 1985, the skins …