Use of Wetlands to Reduce Nitrogen Loads in the Mississippi Atchafalaya River Basin
Author: Rachel Susanna Doughty
Publisher:
Published: 2003
Total Pages: 174
ISBN-13:
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Author: Rachel Susanna Doughty
Publisher:
Published: 2003
Total Pages: 174
ISBN-13:
DOWNLOAD EBOOKAuthor: National Research Council
Publisher: National Academies Press
Published: 2009-07-13
Total Pages: 91
ISBN-13: 0309141788
DOWNLOAD EBOOKA large area of coastal waters in the northern Gulf of Mexico experiences seasonal conditions of low levels of dissolved oxygen, a condition known as hypoxia. Excess discharge of nutrients into the Gulf of Mexico from the Mississippi and Atchafalaya rivers causes nutrient overenrichment in the gulf's coastal waters and stimulates the growth of large algae blooms. When these algae die, the process of decomposition depletes dissolved oxygen from the water column and creates hypoxic conditions. In considering how to implement provisions of the Clean Water Act to strengthen nutrient reduction objectives across the Mississippi River basin, the U.S. Environmental Protection Agency (EPA) requested advice from the National Research Council. This book represents the results of the committee's investigations and deliberations, and recommends that the EPA and U.S. Department of Agriculture should jointly establish a Nutrient Control Implementation Initiative to learn more about the effectiveness of actions meant to improve water quality throughout the Mississippi River basin and into the northern Gulf of Mexico. Other recommendations include how to move forward on the larger process of allocating nutrient loading caps-which entails delegating responsibilities for reducing nutrient pollutants such as nitrogen and phosphorus-across the basin.
Author:
Publisher:
Published: 1999
Total Pages: 152
ISBN-13:
DOWNLOAD EBOOKAuthor: Nidhi Nagabhatla
Publisher: Springer
Published: 2017-10-25
Total Pages: 319
ISBN-13: 3319674161
DOWNLOAD EBOOKThis book describes how natural or constructed wetlands can be used to reduce pollution of freshwater and coastal ecosystems, while still preserving their biodiversity and ecological functions. Through a series of case histories described in 10 chapters in the monograph, the readers will gain an understanding of the opportunities, as well as the challenges associated with reducing point and non-point source pollution using natural, restored or constructed wetlands. The target audience will be water practitioners involved in projects utilizing integrated watershed management approaches to pollution abatement, as well as researchers who are designing projects focused on this topic.
Author: Noah Rocco Scalero
Publisher:
Published: 2020
Total Pages: 110
ISBN-13:
DOWNLOAD EBOOKPersistently elevated nitrogen loads discharged to the Gulf of Mexico from the Mississippi and Atchafalaya rivers have been shown by a vast body of literature to be the cause of recurring hypoxic conditions in the Gulf of Mexico. Riverine wetlands have been shown to be important ecosystems capable of substantially reducing nitrogen loads delivered downstream through N removal processes including denitrification, anaerobic ammonium oxidation, and plant uptake. In order to assess the relative potential of wetland sites for nitrogen attenuation, a suitability analysis was performed to identify the relative nitrogen attenuation potential of wetlands within the Middle Mississippi River (MMR) floodplain. For this assessment, the literature on nitrogen cycling in riverine wetlands was used to identify variables which are associated with denitrification potential. Data for these variables were sourced from publicly available geospatial datasets and floodplain inundation frequency estimates using a hydraulic model. The variables compiled for this analysis included flood frequency, soil drainage class, soil hydrologic class, soil pH, soil texture, land use, and soil organic carbon. Principle component analysis was applied to the dataset to reduce the number of variables in the suitability model. The results of the principle components analysis revealed that the first four components explained 77% of the variation within the dataset of potential denitrification variables. As a result of the PCA analysis, the variables Soil Hydrologic Class, Soil Organic Carbon, Land Cover, Soil pH, SSURGO's Flood Frequency, and Flood Exceedance Probability were used to evaluate riverine wetland areas potential for denitrification under two hydrologic connection scenarios, a "with-levee" and a "no-levee" condition. For the with levee scenario, there were 66,146 ha of floodplain that attained a suitability rating of average potential, an additional 16,937 ha of floodplain attained high potential, and 706 ha of floodplain were rated as having very-high potential. The second scenario assumed removal of levees in the study area. In this scenario, there were 65,897 ha in the floodplain that attained a suitability rating of average potential. There were 34,457 ha in the study segment that attained a rating of high potential, whereas 510 ha attained a very-high potential on the suitability scale. These results were then analyzed by levee system, comparing economic and population data with the results of the suitability analysis. In particular, the amount of area within a levee system achieving a rating of high potential vs. the total property value within the levee system was compared to determine which systems would be best candidates for strategic reconnection. This analysis suggests that the Bois & Brule, the Big Five, and the Grand Tower / Degonia Levee systems are the most suitable systems for strategic reconnection efforts in the study area.
Author: Chad Walter Drake
Publisher:
Published: 2018
Total Pages: 183
ISBN-13:
DOWNLOAD EBOOKReducing agricultural nutrient loading in Iowa is critical to achieving Gulf of Mexico hypoxia water quality goals. Iowa comprises 4.4% of the Mississippi-Atchafalaya River Basin but contributes an average of 29% of the annual nitrate (NO3-N) load to the Gulf of Mexico (Jones et al., 2018). The main goal of this research was to study nitrogen fate and transport in agricultural areas of Iowa at different spatial scales using a unique combination of water monitoring and numerical modeling. High-frequency, continuous water quality monitoring provided valuable insights into stream and wetland NO3-N dynamics. A biogeochemical model was written and coupled to a spatially distributed, surface-subsurface hydrologic model to perform continuous (multi-year) nitrogen fate and transport simulations at the field, wetland, and watershed scales. Field scale simulations of a tile-drained, corn-soybean rotation under conventional agricultural management over a 5-yr period illustrated strengths and weaknesses of the soil nitrogen model. Using a simplified approach to describe soil organic matter dynamics, the simulated annual nitrogen balance and NO3-N loss in tile drainage were comparable to observations and literature estimates. However, the model was not able to predict the correct response of NO3-N loss in tile drainage to fertilizer rate, which was attributed in part to limitations with the current plant uptake function which did not capture the nonlinear relationship expected between fertilizer rate and crop nitrogen uptake. NO3-N removal was quantified at one of Iowa's largest constructed wetlands using high-frequency (15-min), continuous water quality monitoring and hydrologic modeling. The wetland reduced incoming NO3-N concentrations 49% and loads by an estimated 61 kg day-1 from May-Nov over a 3-yr period.
Author: Bryan P. Piazza
Publisher: Texas A&M University Press
Published: 2014-02-25
Total Pages: 322
ISBN-13: 1623490391
DOWNLOAD EBOOKIn this comprehensive, one-volume reference, Nature Conservancy scientist Bryan P. Piazza poses five key questions: —What is the Atchafalaya River Basin? —Why is it important? —How have its hydrology and natural habitats been managed? —What is its current state? —How do we ensure its survival? For more than five centuries, the Atchafalaya River Basin has captured the flow of the Mississippi River, becoming its main distributary as it reaches the Gulf of Mexico in south Louisiana. This dynamic environment, comprising almost a million acres of the lower Mississippi Alluvial Valley and Mississippi River Deltaic Plain, is perhaps best known for its expansive swamp environments dominated by baldcypress, water tupelo, and alligators. But the Atchafalaya River Basin contains a wide range of habitats and one of the highest levels of biodiversity on the North American continent. Piazza has compiled and synthesized the body of scientific knowledge for the Atchafalaya River Basin, documenting the ecological state of the basin and providing a baseline of understanding. His research provides a crucial resource for future planning. He evaluates some common themes that have emerged from the research and identifies important scientific questions that remain unexplored.
Author: Dee L. Lurry
Publisher:
Published: 1997
Total Pages: 68
ISBN-13:
DOWNLOAD EBOOKAuthor: Nicole Karwowski Ph.D.
Publisher:
Published: 2023
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKI identify the ecosystem services of restored wetlands using causal inference, theoretical models, empirical data analysis, and cost-benefit calculations. Specifically, I measure the impact of the Natural Resources Conservation Service (NRCS) Wetland Reserve Program on agricultural production, crop yields, and water quality. I find evidence that wetland easements reduce risk in agricultural systems, increase crop yields by acting as flood buffers, and improve water quality by filtering nutrients. First, I find evidence that wetland easements enhance agricultural resiliency at the county-level by reducing vulnerability to climate-related risks and shocks. Easements impact agricultural production directly by reducing planting on marginal land and indirectly by improving yields on surrounding cropland. Second, I evaluate the costs and benefits in terms of remote-sensed agricultural yields of the Wetland Reserve Program, at the field-level in Wisconsin. This analysis provides an understanding of the optimal prices and flood mitigation services of land conservation. I identify the forgone yields of placing a field in easement and suggest improvements to increase program cost-effectiveness. Additionally, I find that surrounding corn yields improve in the years following wetland restoration due to changes in hydrological patterns. Third, I causally identify whether newly restored wetlands are effective at reducing nitrogen (ammonia) and phosphorus loads at the subwatershed level in the Mississippi/Atchafalaya River Basin. Results suggest that wetland easements reduce ammonia concentrations, and that effects are heightened in areas with a higher proportion of vegetation and open water. Finally, I also identify the conditions and places in which these effects occur, to highlight potential selection criteria for future wetland easements to optimize ecosystem services.
Author:
Publisher:
Published: 2003
Total Pages: 6
ISBN-13:
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