Assessing the Role of Geology for Nitrate Fate and Transport in Groundwater Beneath Riparian Buffers PDF Download
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Author: Timothy Ryan Wineland Publisher: ISBN: Category : Languages : en Pages : 244
Book Description
Riparian buffers have been shown to remove nitrate from groundwater, but the processes controlling removal are not well documented. Previous research at the Risdal Farm in the Bear Creek watershed in central Iowa suggests that geology influences groundwater velocity, residence time, denitrification rate, and ultimately how well the buffer functions. The research area for this study is the entire Bear Creek watershed, a 7,656 ha watershed with> 85 percent row crops. A multi-electrode electrical resistivity imaging system was used to characterize the extent and distribution of alluvial materials beneath buffers. Seven locations were selected for further groundwater investigations based on resistivity data and buffer maturity. A method for the construction, installation and monitoring of multilevel piezometers was developed for collection of hydrogeologic data in shallow alluvial sediments. Hydraulic gradient and hydraulic conductivity data from piezometers were used to assess controlling factors on nitrate removal in buffers. Buffers at the JRS, LSW, and TE sites both consistently removed over 95 percent of nitrate. The RRS and LSE sites often had little effect on nitrate removal, but occasionally achieved much higher removal rates. Nitrate removal was favored in locations with available dissolved organic carbon and low groundwater velocities (long residence time). Lack of dissolved oxygen in these locations suggests denitrifcation as the removal mechanism. Based on data from the 6 sites, the water quality benefits of buffers are most dependent on geology, groundwater residence time and geochemical environment and least dependent on the age of the buffer.
Author: Timothy Ryan Wineland Publisher: ISBN: Category : Languages : en Pages : 244
Book Description
Riparian buffers have been shown to remove nitrate from groundwater, but the processes controlling removal are not well documented. Previous research at the Risdal Farm in the Bear Creek watershed in central Iowa suggests that geology influences groundwater velocity, residence time, denitrification rate, and ultimately how well the buffer functions. The research area for this study is the entire Bear Creek watershed, a 7,656 ha watershed with> 85 percent row crops. A multi-electrode electrical resistivity imaging system was used to characterize the extent and distribution of alluvial materials beneath buffers. Seven locations were selected for further groundwater investigations based on resistivity data and buffer maturity. A method for the construction, installation and monitoring of multilevel piezometers was developed for collection of hydrogeologic data in shallow alluvial sediments. Hydraulic gradient and hydraulic conductivity data from piezometers were used to assess controlling factors on nitrate removal in buffers. Buffers at the JRS, LSW, and TE sites both consistently removed over 95 percent of nitrate. The RRS and LSE sites often had little effect on nitrate removal, but occasionally achieved much higher removal rates. Nitrate removal was favored in locations with available dissolved organic carbon and low groundwater velocities (long residence time). Lack of dissolved oxygen in these locations suggests denitrifcation as the removal mechanism. Based on data from the 6 sites, the water quality benefits of buffers are most dependent on geology, groundwater residence time and geochemical environment and least dependent on the age of the buffer.
Author: Robert John Andress Publisher: ISBN: Category : Languages : en Pages : 314
Book Description
Following the background studies, a Br tracer test and a Br and N03-N tracer test were conducted. The sediments at the site consist of a fining-upward sequence that influences N03-N transport and groundwater residence time. Groundwater velocity increases with depth and varies from 0.10 in the loam to 1.00 m/d in the coarse sand. Groundwater residence time for the buffer varies from 25 to 250 days. Loss of N03-N relative to Br was not observed until after injection ceased, at which time dissolved 02 concentrations decreased to pre-test levels. Calculated rates of N03-N loss from 0.15 to 2.28 mg N/L/d and N20-N production rates from 2.5 x 10−4 to 3.3 x 10−3 mg N/L/d are consistent with previous studies.
Author: Larry W. Canter Publisher: Routledge ISBN: 1351428667 Category : Technology & Engineering Languages : en Pages : 288
Book Description
This time-saving book provides extensive coverage of all important aspects of nitrates in groundwater, ranging from prevention to problem assessment to remediation. It begins by highlighting the nitrogen cycle and related health concerns, providing both background information and a unique perspective on health issues. It then analyzes subsurface pr
Author: Neven Kresic Publisher: CRC Press ISBN: 9780849333484 Category : Technology & Engineering Languages : en Pages : 836
Book Description
Coupling the basics of hygrogeology with analytical and numerical modeling methods, Hydrogeology and Groundwater Modeling, Second Edition provides detailed coverage of both theory and practice. Written by a leading hydrogeologist who has consulted for industry and environmental agencies and taught at major universities around the world, this unique book fills a gap in the groundwater hydrogeology literature. With more than 40 real-world examples, the book is a source for clear, easy-to-understand, and step-by-step quantitative groundwater evaluation and contaminant fate and transport analysis, from basic laboratory determination to complex analytical calculations and computer modeling. It provides more than 400 drawings, graphs, and photographs, and a variety of useful tables of all key groundwater parameters, as well as lucid, straightforward answers to common hydrogeological problems. Reflecting nearly ten years of new scholarship since the publication of the bestselling first edition, this second edition is wider in focus with added and updated examples, figures, and problems, yet still provides information in the author's trademark, user-friendly style. No other book offers such carefully selected examples and clear, elegantly explained solutions. The inclusion of step-by-step solutions to real problems builds a knowledge base for understanding and solving groundwater issues.
Author: Timothy Ryan Wineland
Author: Timothy Ryan Wineland
Author: 
Author: American Society of Agronomy
Author: Robert John Andress
Author: Gary K. Speiran
Author: Bernard T. Nolan
Author: Larry W. Canter
Author: Martha L. Erwin
Author: 
Author: Neven Kresic