Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Download A Tracer Approach To Estimate Groundwater Nitrate Loading From Agricultural Fields full books in PDF, epub, and Kindle. Read online A Tracer Approach To Estimate Groundwater Nitrate Loading From Agricultural Fields ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Author : Jacob James Krause
Publisher :
ISBN 13 :
Total Pages : 178 pages
Book Rating : 4.:/5 (1 download)
Download or read book A Tracer Approach to Estimate Groundwater Nitrate Loading from Agricultural Fields written by Jacob James Krause and published by . This book was released on 2017 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Farzin Malekani
Publisher :
ISBN 13 : 9780494926697
Total Pages : pages
Book Rating : 4.9/5 (266 download)
Download or read book A New Approach to Estimate Monthly Groundwater Nitrate Loading from an Individual Agricultural Field written by Farzin Malekani and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Loren Bekeris
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)
Download or read book Field-Scale Evaluation of Enhanced Agricultural Management Practices Using a Novel Unsaturated Zone Nitrate Mass Load Approach written by Loren Bekeris and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sara Esmaeili
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (892 download)
Download or read book Comprehensive Simulation Assessment of Nitrate Mass Loading to Groundwater from Agricultural Landscapes written by Sara Esmaeili and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this research was to evaluate the ability of two agricultural system models, the Root Zone Water Quality Model (RZWQM) and the Coupled Model (CoupModel), to simulate temporal nitrate mass loading below the root zone. To tackle this evaluation effort the following research objectives were developed: (1) determine the sensitivity of key model output responses for a selected agricultural system model to the variability of input parameters over different vertical-spatial and temporal domains; (2) compare and elucidate the ability of two agricultural system models to simulate water flux and nitrate loading at the plot scale; (3) explore the capability of an agricultural system model that is fully calibrated at one location to simulate the water flux and nitrate loading at another location with similar soil and cropping characteristics; and (4) use a calibrated and validated agricultural system model to predict groundwater recharge and nitrate loading resulting from the implementation of a best management practice (BMP) established on a parcel of land where groundwater impacts due to nitrogen application have been observed. Two study sites where elevated nitrate concentrations in groundwater have been observed were used in this research. The primary study site was the shallow unconfined Abbotsford Aquifer, located in Lower Fraser Valley, British Columbia, where elevated groundwater nitrate concentration is attributed to excess nitrogen inputs compared with the nitrogen demand of the red raspberry crop. The secondary study site was the Thornton Well Field in southwestern Ontario where a legacy of agricultural activities in the area has resulted in an increased groundwater nitrate concentration. In summary, global sensitivity analysis not only identified the most influential parameters of the model that required calibration but also provided a useful guide to define the timing and vertical-location of the observation data that is most effective to use as the calibration target, and design appropriate experiments for collecting such data. Both selected models, RZWQM and CoupModel, were reliable for prediction of nitrate loading time series below the raspberry root zone; however, the CoupModel performed better than the RZWQM due to its flexibility for modifying growth parameters when perennial crops are simulated. The calibrated CoupModel was applicable for simulating nitrate flux below the raspberry root zone in a nearby farm within the Abbotsford region except for the years when organic fertilizer was applied. While the results of this transportability effort are promising, additional validation at similar fields under different management practices is encouraged. Also, development of models that capture the effects of raspberry inter-rows cropping system on nitrate and water flux below the raspberry root zone is essential. At the Thornton Well Field, the BMPs were effective in reducing nitrate load into the groundwater; however, various time frames are needed to observe significant response to the BMPs at different farmlands.
Author : Lonna M. Frans
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.3/5 (91 download)
Download or read book Estimating the Probability of Elevated Nitrate (NO2+NO3-N) Concentrations in Ground Water in the Columbia Basin Ground Water Management Area, Washington written by Lonna M. Frans and published by . This book was released on 2000 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Katherine Marie Ransom
Publisher :
ISBN 13 : 9780355150452
Total Pages : pages
Book Rating : 4.1/5 (54 download)
Download or read book Bayesian and Machine Learning Methods for the Analysis of Nitrate in Groundwater in the Central Valley, California, USA written by Katherine Marie Ransom and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of Bayesian and machine learning methods for the analysis of nitrate in groundwaterin an alluvial aquifer system overlain with intensive agricultural production demonstrateda deeper understanding of the sources, fate, and transport of nitrogen in the system. Specifically,this work investigates the sources of nitrate to groundwater, nitrogen loading rates, and therelationships between land use, hydrogeologic parameters, aquifer properties and nitrate concentrationsat drinking water depths. This work is focused in the Central Valley, California, an areawhere intensive agricultural production coexists with a large peri-urban population entirely dependenton groundwater for drinking water and household use. Drinking water with elevatednitrate concentration has associated health risks. Nitrate in groundwater in the Central Valley ismainly the result of agriculture, but can also originate from septic tank leachate or natural sources. Within agricultural sources, the amount of nitrate leached to groundwater from individual croptypes is not well documented and also varies. Beyond that, complicated interactions betweenphysical aquifer characteristics, land use, and groundwater age mixing can affect the amount ofnitrate actually pumped by wells. This work is composed of three chapters, each focused on theindividual aspects mentioned above by use of Bayesian and machine learning statistical models.Boron isotopes, nitrogen and oxygen isotopes of nitrate, as well as iodine proved useful as a setof indicators of nitrate contamination source by way of a Bayesian mixing model and source apportionmentwas performed on an individual well basis for a portion of the Central Valley. Eachwell investigated exhibited evidence of nitrate source mixing, though several wells’ chemistry indicateda clear majority source. The manure and fertilizer sources were generally distinguishable,however, the fertilizer and septic source were not as clearly differentiated. This work highlightsthe uncertainty associated with nitrogen source tracking. Probability distributions for nitrogenloading rates of crop groups were estimated with an exponential distribution generalized linearmodel using Bayesian methods. Estimated loading rates were compared to previous measurementsand estimates. Most compared favorably, though mass balance estimates for several cropgroups were higher than the model estimates. This was attributed to dilution with old groundwateror river water and denitrification. Confined animal feeding operations, citrus & subtropicalcrops, and vegetable & berry crops had the highest predicted nitrogen loading rates, respectively, while water & natural and alfalfa & pasture had the lowest. The estimated rates can provide abetter assessment of land use impacts to water quality absent information on farm nutrient management.A machine learning model was used to produce a 3D map of nitrate concentration atdrinking water depths in the Central Valley. A hybrid multi-modeling approach used numericalmodel outputs as predictors and groundwater redox characteristics and field scale unsaturatedzone nitrogen flux were the most important variables related to nitrate concentration. Nitrate concentrationsless than 2 mg/L NO3-N were generally located in the basin subregion and nitrateconcentrations greater than 10 mg/L NO3-N were the most common in eastern alluvial fans subregion.The map could be used by regulators to determine priority areas for nutrient managementrules or by homeowners to determine their individual risk of a nitrate contaminated well.
Author : Lidia Razowska-Jaworek
Publisher : CRC Press
ISBN 13 : 148229835X
Total Pages : 312 pages
Book Rating : 4.4/5 (822 download)
Download or read book Nitrates in Groundwater written by Lidia Razowska-Jaworek and published by CRC Press. This book was released on 2014-04-21 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book devoted entirely to the problem of nitrate risk and behaviour in groundwater, this volume includes twenty-seven papers selected from those presented during the Euromeeting of the International Association of Hydrogeologists "Nitrate in Groundwater in Europe" held in Wisla, Poland in 2002. The problems presented and discussed in Wisla
Author : GR Walker
Publisher : CSIRO PUBLISHING
ISBN 13 : 0643106081
Total Pages : 40 pages
Book Rating : 4.6/5 (431 download)
Download or read book Using Soil Water Tracers to Estimate Recharge - Part 7 written by GR Walker and published by CSIRO PUBLISHING. This book was released on 1998-08-01 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: This booklet covers the soil tracer techniques that have been shown to be useful for Australian situations. These important tracer techniques include those involving surface-applied tracers, historically-applied tracers and environmental soil tracers.
Author : Michael J. Focazio
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (319 download)
Download or read book Assessing Ground-water Vulnerability to Contamination written by Michael J. Focazio and published by . This book was released on 2002 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Peter G. Cook
Publisher : Springer Science & Business Media
ISBN 13 : 1461545579
Total Pages : 545 pages
Book Rating : 4.4/5 (615 download)
Download or read book Environmental Tracers in Subsurface Hydrology written by Peter G. Cook and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 545 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental Tracers in Subsurface Hydrology synthesizes the research of specialists into a comprehensive review of the application of environmental tracers to the study of soil water and groundwater flow. The book includes chapters which cover ionic tracers, noble gases, chlorofluorocarbons, tritium, chlorine-36, oxygen-18, deuterium, and isotopes of carbon, strontium, sulphur and nitrogen. Applications of the tracers include the estimation of vertical and horizontal groundwater velocities, groundwater recharge rates, inter-aquifer leakage and mixing processes, chemical processes and palaeohydrology. Practicing hydrologists, soil physicists and hydrology professors and students will find the book to be a valuable support in their work.
Author :
Publisher :
ISBN 13 :
Total Pages : 124 pages
Book Rating : 4.3/5 (121 download)
Download or read book Monitored Natural Attenuation of Inorganic Contaminants in Ground Water written by and published by . This book was released on 2007 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: V.3 ... consists of individual chapters that describe 1) the conceptual background for radionuclides, including tritium, radon, strontium, technetium, uranium, iodine, radium, thorium, cesium, plutonium-americium and 2) data requirements to be met during site characterization.
Author : Istvan Bogardi
Publisher : Springer Science & Business Media
ISBN 13 : 3642760406
Total Pages : 438 pages
Book Rating : 4.6/5 (427 download)
Download or read book Nitrate Contamination written by Istvan Bogardi and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nitrate content of drinking water is rising at an alarming rate in several regions of NATO countries and elsewhere in the world. The increase is due to lack of proper sewage treatment, and primarily to excess fertilizer application. Also, eutrophication in several coastal areas is triggered by high nitrate concentrations. The main purpose of this book is to integrate scientific knowledge related to exposure assessment, health consequences and control of nitrate contamination in water. The motivation is related to the magnitude, the possible adverse health effects, and the high cost of control ling nitrate contamination. Future research tasks are defined by an interaction among hydro logists, toxicologists and environmental engineers in an integrated framework for nitrate risk management. The target readership of this book is a mix of university colleagues, practitioners from both the private and public sectors and advanced graduate students working with the hydrological, health science or environmental engineering aspects of nitrate contamination. The main conclusions include: 1. For risk assessment purposes, knowledge and sufficiently accurate models are available to predict nitrate load and its fate in water under changes in land use. 2. Once agricultural exposure controls are implemented, the response times in ground water may be so long as to make controls unrealistic. 3. It is still unknown whether agricultural best management practice is a compromise between nitrate risk reduction and agricultural revenue. 4. The current drinking water guidelines of 10 mg/L NOrN need not be changed.
Author :
Publisher :
ISBN 13 :
Total Pages : 806 pages
Book Rating : 4.3/5 (91 download)
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gr Walker
Publisher : CSIRO
ISBN 13 : 9780643062801
Total Pages : 40 pages
Book Rating : 4.0/5 (628 download)
Download or read book Using Soil Water Tracers to Estimate Recharge written by Gr Walker and published by CSIRO. This book was released on 1998 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Part of a series studying catchment hydrology, this text covers the soil tracer techniques that have been shown useful for Australian situations. These techniques include those involving surface-applied tracers, historically-applied tracers and environmental soil tracers.
Author : C. Kendall
Publisher : Elsevier
ISBN 13 : 008092915X
Total Pages : 870 pages
Book Rating : 4.0/5 (89 download)
Download or read book Isotope Tracers in Catchment Hydrology written by C. Kendall and published by Elsevier. This book was released on 2012-12-02 with total page 870 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book represents a new "earth systems" approach to catchments that encompasses the physical and biogeochemical interactions that control the hydrology and biogeochemistry of the system. The text provides a comprehensive treatment of the fundamentals of catchment hydrology, principles of isotope geochemistry, and the isotope variability in the hydrologic cycle -- but the main focus of the book is on case studies in isotope hydrology and isotope geochemistry that explore the applications of isotope techniques for investigating modern environmental problems. Isotope Tracers in Catchment Hydrology is the first synthesis of physical hydrology and isotope geochemistry with catchment focus, and is a valuable reference for professionals and students alike in the fields of hydrology, hydrochemistry, and environmental science. This important interdisciplinary text provides extensive guidelines for the application of isotope techniques for all investigatores facing the challenge of protecting precious water, soil, and ecological resources from the ever-increasing problems associated with population growth and environmental change, including those from urban development and agricultural land uses.
Author : Christine Ross Miller
Publisher :
ISBN 13 :
Total Pages : 200 pages
Book Rating : 4.:/5 (912 download)
Download or read book Groundwater Nitrate Transport and Residence Time in a Vulnerable Aquifer Under Dryland Cereal Production written by Christine Ross Miller and published by . This book was released on 2013 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selection of agricultural management practices to reduce nitrate leaching from soils can only be successful if both nitrate loading rates from soils to shallow aquifers and groundwater residence times are quantified. Elevated nitrate concentrations in shallow unconfined aquifers are commonly observed in agricultural areas as a result of increased N inputs. In the Judith River Watershed (JRW) in central Montana, USA, notably high nitrate concentrations in groundwater and stream water have exceeded the U.S. EPA drinking water standard of 10 mg L -1 for at least two decades. This large (24,400 ha) watershed drains immediately into the Missouri River, a tributary of the Mississippi River. Over an eleven month period in 2012, we measured groundwater and surface water nitrate concentrations across a hydrologically isolated strath terrace. We use the resulting data to constrain nitrate accumulation dynamics in the shallow aquifer. Nitrate is relatively conservative in this location, as it is high in groundwater (17.57 +/- 4.29 mg L -1; all groundwater samples pooled together), and remains high in streams and springs that drain the landform (15.67 +/- 9.45 mg L -1; all surface water and spring samples pooled together). We use a numerical model to simulate the character of nitrate accumulation in the aquifer as a whole, in order to evaluate how the entire period of cultivation has contributed to current nitrate concentrations, and begin to predict response times for effects of land use change. We consider the effect of groundwater residence time and travel time on nitrate loading using particle tracking in a three dimensional model aquifer. We find no correlation with nitrate concentrations in groundwater and emerging surface waters, and suggest approaches for improving both the geometry of the model and the selection of sites in future work. Overall, our results imply that groundwater residence times are several decades at most, suggesting that similar timeframes will be needed to reduce overall nitrate concentrations in groundwater and emergent streams to below drinking water standards. Preliminary evaluation of several management scenarios suggests that both increased fertilizer use efficiency and rotational strategies may be needed to prevent the loss of soil N to groundwater.
Author : Kevin Michael Morrissey
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (27 download)
Download or read book Determining the Source of Nitrate Contamination in Groundwater Using 15-nitrogen as a Tracer written by Kevin Michael Morrissey and published by . This book was released on 1989 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
