2014
DOI: 10.1002/2013jg002477
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Floodplain biogeochemical processing of floodwaters in the Atchafalaya River Basin during the Mississippi River flood of 2011

Abstract: The 2011 flood in the Lower Mississippi resulted in the second highest recorded river flow diverted into the Atchafalaya River Basin (ARB). The higher water levels during the flood peak resulted in high hydrologic connectivity between the Atchafalaya River and floodplain, with up to 50% of the Atchafalaya River water moving off channel. Water quality samples were collected throughout the ARB over the course of the flood event. Significant nitrate (NO 3 À ) reduction (75%) occurred within the floodplain, result… Show more

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Cited by 41 publications
(56 citation statements)
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“…In the southern end of the WMU on the rising limb, isotopic composition was a mix of river water and the northern swamp water, suggesting incomplete connectivity to the river. Analyses in this work (and by Scott et al, 2014) also indicated that dD was correlated with changes in water quality as the flood progressed, although only when the spatial influence of subregion and site-specific differences in aquatic vegetation were considered. These results suggest site-level floodplain water quality was linked to differences in connectivity to the river, but was also subject to considerable local-scale alteration.…”
Section: Discussionmentioning
confidence: 58%
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“…In the southern end of the WMU on the rising limb, isotopic composition was a mix of river water and the northern swamp water, suggesting incomplete connectivity to the river. Analyses in this work (and by Scott et al, 2014) also indicated that dD was correlated with changes in water quality as the flood progressed, although only when the spatial influence of subregion and site-specific differences in aquatic vegetation were considered. These results suggest site-level floodplain water quality was linked to differences in connectivity to the river, but was also subject to considerable local-scale alteration.…”
Section: Discussionmentioning
confidence: 58%
“…In this flood event, concentrations of 18 O and D in river water were lower (more negative) than water in the backswamps . Therefore, based on lower concentrations observed in Buffalo Cove WMU than Henderson WMU, which were interpreted to be indicative of river water following Scott et al (2014), the isotopic evidence indicated that river connectivity was generally greater in Buffalo Cove WMU. In Buffalo Cove WMU, the slope near 8 indicates mixing with rain water was more likely the cause of the change than was evaporative fractionation.…”
Section: Discussionmentioning
confidence: 98%
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“…If the results of the nutrient deposition from this Spillway opening were extended to a reduction of Mississippi River particulate N load of 40% as suggested by Mitsch et al (2001Mitsch et al ( , 2005 it would require 34,000 km 2 of restoration / reconnection. Although numerous other dissolved nutrient transformations and uptakes occurred (Scott et al, 2014), it is evident from the results that the particulate nutrient and sediment trapping ability of the Morganza Spillway was limited because suspended sediment was quickly deposited along the flow path and not refreshed by incremental water exchanges between the Atchafalaya River (the western boundary) and the Floodway. Rather, there was one source of water with a particulate nutrient and sediment supply that was rather quickly depleted.…”
Section: Resultsmentioning
confidence: 93%
“…In contrast, the proportions of Ca/Mg-P and available-P in our study showed an opposite trends (lower Ca/Mg-P and higher available-P at the furthest stations). The stations located furthest from the mouth of the Mississippi River are under direct influence of the discharge of the Atchafalaya River which contains a flood plain of hydrologically connected marshes with high organic matter soils and may also influence sediments in this area (Scott et al, 2014).…”
Section: Phosphorus Fractionationmentioning
confidence: 99%