The use of wetlands in the Mississippi Delta for wastewater assimilation: a review

Day, John W.; Ko, Jae-Young; Rybczyk, John; Sabins, Dugan; Bean, Robert A.; Berthelot, G.; Brantley, Christopher G.; Cardoch, Lynette; Conner, William H.; Day, John; Englande, A. J.; Feagley, S. E.; Hyfield, Emily; Lane, Robert R.; Lindsey, Joel; Mistich, J.; Reyes, Enrique; Twilley, Robert R.

doi:10.1016/j.ocecoaman.2004.12.007

Cited by 138 publications

(52 citation statements)

References 25 publications

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“…Such sediment deposition over floodplains is an important process in the storage and cycling of sediments, nutrients and contaminants in the river basins Walling and Owens, 2003;Noe and Hupp, 2009). Focussing on organic carbon (TOC) and nitrogen (TN), deposition during overbank floods is an important ecosystem function which provides important benefits as water quality enhancement or mitigation of greenhouse effect (Johnston, 1991;Day et al, 2004;Verhoeven et al, 2006, IPCC, 2007. At the reach scale, TOC and TN exchange between the main channel and its adjacent floodplain plays a key role in the ecological functioning (Junk, 1999;Robertson et al, 1999;Tockner et al, 1999;Tockner at al., 2000;Thoms, 2003;Knosche, 2006;Preiner et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Spatial variability in floodplain sedimentation: the use of generalized linear mixed-effects models

Cabezas

Angulo‐Martínez

González-Sanchis

et al. 2010

Hydrol. Earth Syst. Sci.

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Abstract. Sediment, Total Organic Carbon (TOC) and total nitrogen (TN) accumulation during one overbank flood (1.15 y return interval) were examined at one reach of the Middle Ebro River (NE Spain) for elucidating spatial patterns. To achieve this goal, four areas with different geomorphological features and located within the study reach were examined by using artificial grass mats. Within each area, 1 m 2 study plots consisting of three pseudo-replicates were placed in a semi-regular grid oriented perpendicular to the main channel. TOC, TN and Particle-Size composition of deposited sediments were examined and accumulation rates estimated. Generalized linear mixed-effects models were used to analyze sedimentation patterns in order to handle clustered sampling units, specific-site effects and spatial self-correlation between observations. Our results confirm the importance of channel-floodplain morphology and site micro-topography in explaining sediment, TOC and TN deposition patterns, although the importance of other factors as vegetation pattern should be included in further studies to explain small-scale variability. Generalized linear mixedeffect models provide a good framework to deal with the high spatial heterogeneity of this phenomenon at different spatial scales, and should be further investigated in order to explore its validity when examining the importance of factors such as flood magnitude or suspended sediment concentration.

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Section: Introductionmentioning

confidence: 99%

Spatial variability in floodplain sedimentation: the use of generalized linear mixed-effects models

Cabezas

Angulo‐Martínez

González-Sanchis

et al. 2010

Hydrol. Earth Syst. Sci.

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“…Hunter et al [13] found slightly higher, but not significant, baldcypress growth at the Breaux Bridge assimilation wetland. Total NPP was highest at the treatment sites for the assimilation wetlands in the town of Amelia, LA [58]. Finally, Hillmann [59] found a linear increase in above-and belowground NPP in baldcypress and water tupelo for loading rates ranging from 0 to 100 g¨N¨m´2¨year´1.…”

Section: Discussionmentioning

confidence: 99%

“…Several restoration projects have been proposed to combat swamp loss, including diversion of Mississippi River water [69][70][71] and expansion of forested assimilation wetlands [13,53,58,67]. Lee Wilson and Associates [72] estimated that a 45 m 3¨s´1 (1600 ft 3¨s´1 ) diversion could deliver approximately 1098 g¨m´2¨year´1 of sediment to the swamp.…”

Section: Approaches To Restorationmentioning

confidence: 99%

Decline of the Maurepas Swamp, Pontchartrain Basin, Louisiana, and Approaches to Restoration

Shaffer

Day

Kandalepas

et al. 2016

Water

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Abstract:The Maurepas swamp is the second largest contiguous coastal forest in Louisiana but it is highly degraded due to subsidence, near permanent flooding, nutrient starvation, nutria herbivory, and saltwater intrusion. Observed tree mortality rates at study sites in the Maurepas swamp are very high (up to 100% tree mortality in 11 years) and basal area decreased with average salinities of <1 ppt. Habitat classification, vegetation productivity and mortality, and surface elevation changes show a clear trajectory from stagnant, nearly permanently flooded forests with broken canopy to degraded forests with sparse baldcypress and dominated by herbaceous species and open water to open water habitat for most of the Maurepas swamp without introduction of fresh water to combat saltwater intrusion and stimulate productivity and accretion. Healthy forests in the Maurepas are receiving fresh water containing nutrients and sediments from urban areas, high quality river water, or secondarily treated municipal effluent. Currently, two proposed diversions into the swamp are via Hope Canal (57 m 3¨s´1 ) and Blind River (142 m 3¨s´1 ). These diversions would greatly benefit their immediate area but they are too small to influence the entire Maurepas sub-basin, especially in terms of accretion. A large diversion (>1422 m 3¨s´1 ) is needed to deliver the adequate sediments to achieve high accretion rates and stimulate organic soil formation.

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“…Wetland microbes also facilitate the denitrification process in which NO 3 is converted into N 2 gas. The natural efficacy of these processes has already been put to use in the Mississippi River delta as a method of combating eutrophication and hypoxia [18].…”

Section: Wetlandsmentioning

confidence: 99%

“…Conventional tertiary treatments methods are often very expensive; wetland assimilation can provide an effective, low-cost alternative if geographically feasible. Day Jr. et al [18] compiled a list of different wetland treatment projects undertaken in coastal Louisiana using data compiled from multiple studies of the individual sites. A selection of site-specific data on nutrient removal, as well as estimated cost savings over a 20-year period (compared to conventional treatment methods) to the communities can be seen in Table 1.…”

Section: Wetlandsmentioning

confidence: 99%

Sustainable Management of Algae in Eutrophic Ecosystems

McNeary¹,

Erickson²

2013

JEP

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The accelerated eutrophication of the world's freshwater and marine ecosystems is a complex problem that results in decreased productivity, loss of biodiversity, and various economic woes. Controlling algae populations in a eutrophic water body has values in mitigating some of these negative effects. This paper reviews a number of strategies for algae management, with a focus on sustainable practices that have minimal environmental impact. The information in the literature is then used to propose a design for an integrated algae-aquaculture system to be used for the dual purposes of nutrient assimilation and production of fish and algal biomass. Effectiveness of the proposed system and possible revenue streams to offset capital costs are examined; other solutions that utilize the techniques in the literature are also explored.

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The use of wetlands in the Mississippi Delta for wastewater assimilation: a review

Cited by 138 publications

References 25 publications

Spatial variability in floodplain sedimentation: the use of generalized linear mixed-effects models

Spatial variability in floodplain sedimentation: the use of generalized linear mixed-effects models

Decline of the Maurepas Swamp, Pontchartrain Basin, Louisiana, and Approaches to Restoration

Sustainable Management of Algae in Eutrophic Ecosystems

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