Modeling the effects of agricultural management practices on groundwater in Shelton, USA

An integrated methodology was developed to assess the impact of recharge rates, nitrate leaching from crop root zones, and irrigation pumping rates on groundwater quality and quantity. Monthly values for deep percolation of water, irrigation pumping and leaching of nitrate-nitrogen were calculated w...

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Autores principales:	Arumí,José Luis, Martin,Derrel, Watts,Darrell
Lenguaje:	English
Publicado:	Universidad Católica de la Santísima Concepción 2011
Materias:	groundwater modeling recharge water quality agricultural management practices
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-28132011000200006
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spelling	oai:scielo:S0718-281320110002000062012-03-28Modeling the effects of agricultural management practices on groundwater in Shelton, USAArumí,José LuisMartin,DerrelWatts,Darrell groundwater modeling recharge water quality agricultural management practices An integrated methodology was developed to assess the impact of recharge rates, nitrate leaching from crop root zones, and irrigation pumping rates on groundwater quality and quantity. Monthly values for deep percolation of water, irrigation pumping and leaching of nitrate-nitrogen were calculated with a soil-water-plant model. An Intermediate Vadose Zone Model (IVZM) was developed and used together with models for groundwater flow (MODFLOW) and solute transport (MT3D) to simulate the movement of water and nitrate-nitrogen. The IVZM generates recharge files used by MODFLOW andJMT3D. The methodology was applied to an area near the town of Shelton, Nebraska, where a shallow sand-gravel aquifer is highly contaminated by nitrate-nitrogen. MODFLOW was calibrated using historic groundwater level data from 1981 to 1996. Simulation results suggest that concentration reductions of 10% in the upper third of the saturated zone are possible after 10 years of improved irrigation and nitrogen fertilizer management. Groundwater quality changes slowly propagate down-gradient from the field and towards the lower part of the aquifer. A particle tracking technique showed that water from a well does not provide a good indication of the influence of improved management in the adjacentfield. The quality ofwater pumpedfrom a well represents the effect of management over 15 years and from more than 1.5 km up-gradient from the well. Regional groundwater quality depends on local management practices over a long period. Regulatory programs to improve water quality require therefore, widespread adoption and substantial time to provide significant water quality improvements.info:eu-repo/semantics/openAccessUniversidad Católica de la Santísima ConcepciónObras y proyectos n.10 20112011-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-28132011000200006en10.4067/S0718-28132011000200006
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	groundwater modeling recharge water quality agricultural management practices
spellingShingle	groundwater modeling recharge water quality agricultural management practices Arumí,José Luis Martin,Derrel Watts,Darrell Modeling the effects of agricultural management practices on groundwater in Shelton, USA
description	An integrated methodology was developed to assess the impact of recharge rates, nitrate leaching from crop root zones, and irrigation pumping rates on groundwater quality and quantity. Monthly values for deep percolation of water, irrigation pumping and leaching of nitrate-nitrogen were calculated with a soil-water-plant model. An Intermediate Vadose Zone Model (IVZM) was developed and used together with models for groundwater flow (MODFLOW) and solute transport (MT3D) to simulate the movement of water and nitrate-nitrogen. The IVZM generates recharge files used by MODFLOW andJMT3D. The methodology was applied to an area near the town of Shelton, Nebraska, where a shallow sand-gravel aquifer is highly contaminated by nitrate-nitrogen. MODFLOW was calibrated using historic groundwater level data from 1981 to 1996. Simulation results suggest that concentration reductions of 10% in the upper third of the saturated zone are possible after 10 years of improved irrigation and nitrogen fertilizer management. Groundwater quality changes slowly propagate down-gradient from the field and towards the lower part of the aquifer. A particle tracking technique showed that water from a well does not provide a good indication of the influence of improved management in the adjacentfield. The quality ofwater pumpedfrom a well represents the effect of management over 15 years and from more than 1.5 km up-gradient from the well. Regional groundwater quality depends on local management practices over a long period. Regulatory programs to improve water quality require therefore, widespread adoption and substantial time to provide significant water quality improvements.
author	Arumí,José Luis Martin,Derrel Watts,Darrell
author_facet	Arumí,José Luis Martin,Derrel Watts,Darrell
author_sort	Arumí,José Luis
title	Modeling the effects of agricultural management practices on groundwater in Shelton, USA
title_short	Modeling the effects of agricultural management practices on groundwater in Shelton, USA
title_full	Modeling the effects of agricultural management practices on groundwater in Shelton, USA
title_fullStr	Modeling the effects of agricultural management practices on groundwater in Shelton, USA
title_full_unstemmed	Modeling the effects of agricultural management practices on groundwater in Shelton, USA
title_sort	modeling the effects of agricultural management practices on groundwater in shelton, usa
publisher	Universidad Católica de la Santísima Concepción
publishDate	2011
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-28132011000200006
work_keys_str_mv	AT arumijoseluis modelingtheeffectsofagriculturalmanagementpracticesongroundwaterinsheltonusa AT martinderrel modelingtheeffectsofagriculturalmanagementpracticesongroundwaterinsheltonusa AT wattsdarrell modelingtheeffectsofagriculturalmanagementpracticesongroundwaterinsheltonusa
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Modeling the effects of agricultural management practices on groundwater in Shelton, USA

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