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Thomas J. Burbey - One of the best experts on this subject based on the ideXlab platform.
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Review: Regional land subsidence accompanying Groundwater Extraction
Hydrogeology Journal, 2011Co-Authors: Devin L. Galloway, Thomas J. BurbeyAbstract:RésuméL’exploitation des eaux souterraines peut générer une subsidence du sous-sol associée à la compaction de systèmes aquifères prédisposés, tels que des systèmes aquifères alluviaux de sédiments meubles ou des systèmes aquifères de bassins sédimentaires comprenant des niveaux aquitards et aquifères. Différentes méthodes au sol ou de télédétection sont utilisées afin de mesurer et de cartographier la subsidence. De nombreuses zones de subsidence associées à une exploitation des eaux souterraines ont été identifiées et surveillées, et des mesures correctives pour réduire ou stopper la subsidence ont été conçues. Deux principales actions sont utilisées pour atténuer la subsidence liée à l’exploitation des eaux souterraines : réduction des prélèvements et recharge artificielle. Des analyses et simulations de la compaction de systèmes aquifères intégrant les relations de base entre potentiels hydrauliques, tensions, compressibilité et écoulement souterrain sont réalisées selon deux approches – une basée sur la théorie classique des écoulements souterrains et l’autre basée sur la théorie de l’élasticité linéaire de la porosité. Des recherches et développements sont néanmoins nécessaires pour améliorer l’évaluation et l’analyse de la compaction des systèmes aquifères, la mise en place de la subsidence et les ruptures potentiels du sous-sol, et pour apporter des mesures pour la gestion de la ressource et pour l’atténuation des risques de subsidence, dans les domaines suivants : comportement hydromécanique des aquitards, rôle de la déformation horizontale, application de l’interférométrie radar d’ouverture synthétique différentielle et simulation couplée à l’échelle régionale des écoulements souterrains et des déformations au sein des systèmes aquifères.ResumenLa extracción de agua subterránea puede generar subsidencia del terreno causando la compactación de sistemas acuíferos susceptibles, típicamente sistemas acuíferos aluviales no consolidado o de relleno de cuenca que comprenden acuíferos y acuitardos. Se utilizan varios métodos de sensoramientos sobre el terreno y remotos para medir y mapear la subsidencia, Muchas áreas de subsidencia causadas por el bombeo del agua subterránea han sido identificadas y monitoreadas, y se han desarrollado medidas correctivas para retrasar o detener la subsidencia. Se usan dos medios principales para mitigar la subsidencia causada por la extracción de agua subterránea – la reducción de la extracción del agua subterránea y la recarga artificial. El análisis y la simulación de la compactación del sistema acuífero se sigue a partir de las relaciones básicas entre carga, tensión, compresibilidad y flujo subterráneo y son evaluados usando primariamente según dos aproximaciones – una basada en la teoría convencional de flujo de agua subterránea y otro basado en la teoría lineal de la poroelasticidad. La investigación y el desarrollo para mejorar la evaluación y el análisis de la compactación de sistemas acuíferos, la subsidencia que acompaña y la ruptura potencial del terreno necesarias en las áreas temáticas del comportamiento hidromecánico del acuitardo, el rol de la deformación horizontal, la aplicación de interferometría diferencial del radar de apertura sintética, y la simulación a escala regional del acoplamiento del flujo de agua subterránea y la deformación del sistema acuífero para sostener el manejo de los recursos y las medidas de mitigación de riesgos.AbstractThe Extraction of Groundwater can generate land subsidence by causing the compaction of susceptible aquifer systems, typically unconsolidated alluvial or basin-fill aquifer systems comprising aquifers and aquitards. Various ground-based and remotely sensed methods are used to measure and map subsidence. Many areas of subsidence caused by Groundwater pumping have been identified and monitored, and corrective measures to slow or halt subsidence have been devised. Two principal means are used to mitigate subsidence caused by Groundwater withdrawal—reduction of Groundwater withdrawal, and artificial recharge. Analysis and simulation of aquifer-system compaction follow from the basic relations between head, stress, compressibility, and Groundwater flow and are addressed primarily using two approaches—one based on conventional Groundwater flow theory and one based on linear poroelasticity theory. Research and development to improve the assessment and analysis of aquifer-system compaction, the accompanying subsidence and potential ground ruptures are needed in the topic areas of the hydromechanical behavior of aquitards, the role of horizontal deformation, the application of differential synthetic aperture radar interferometry, and the regional-scale simulation of coupled Groundwater flow and aquifer-system deformation to support resource management and hazard mitigation measures.摘要地下水开采引起敏感性含水层系统压实,进而产生地面沉降。典型的敏感性含水层系统有松散冲积和盆地充填含水层系统,由含水层和弱透水层组成。有多种基于地面资料和遥感数据的方法可以测量并刻画地面沉降。诸多因地下水开采而引起的地面沉降区,已得到识别和相应监测,并有减缓或者阻止地面沉降的校正措施提出。对于地下水开采引起的地面沉降, 两种用来减缓的主要措施为:减少地下水开采量与人工回灌。含水层系统压实的分析与模拟从属于水头、压力、可压缩性和地下水流的基本关系,且主要采用两种方法实现:一是基于普通的地下水流理论;二是基于线性弹性力学理论。改进含水层系统压实评价与分析以及相应的沉降和潜在地面断裂的研发需要关注以下领域:包括弱透水层的流体力学特征,水平变形的作用,多种差分合成孔径雷达干涉测量的应用,区域尺度上地下水流和含水层系统的变形模拟等,以支持资源管理和减灾措施。ResumoA extracção de água subterrânea pode ocasionar a subsidência dos terrenos em resultado da compacção em sistemas aquíferos susceptíveis, tipicamente sistemas aquíferos aluviais ou de enchimento de bacias, compreendendo aquíferos e aquitardos. Para medir e mapear a subsidência são usados vários métodos baseados em leituras no terreno ou em detecção remota. Numerosas áreas com subsidência causada por bombagem de água subterrânea têm sido identificadas e monitorizadas, assim como têm sido desenvolvidas medidas correctivas para atrasar ou parar a subsidência. Utilizam-se dois processos principais para mitigar a subsidência causada por extracção de água subterrânea: a redução da taxa de bombagem e a recarga artificial. A análise e a simulação da compacção de sistemas aquíferos decorrem das relações básicas entre carga hidráulica, estados de tensão, compressibilidade e fluxos de água subterrânea e são tratados através de duas abordagens, uma baseada na teoria convencional do fluxo de água subterrânea e outra baseada na teoria da poroelasticidade linear. Para suportar medidas de gestão do recurso e medidas de mitigação de risco serão necessários a investigação e o desenvolvimento, a análise da compacção de sistemas aquíferos e das resultantes subsidência e potencial rotura de terrenos, em tópicos como o comportamento hidromecânico de aquitardos, o papel da deformação horizontal, a aplicação de interferometria de radar de abertura sintética diferencial e a simulação à escala regional do acoplamento do fluxo subterrâneo com a deformação de sistemas aquíferos.
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review regional land subsidence accompanying Groundwater Extraction
Hydrogeology Journal, 2011Co-Authors: Devin L. Galloway, Thomas J. BurbeyAbstract:The Extraction of Groundwater can generate land subsidence by causing the compaction of susceptible aquifer systems, typically unconsolidated alluvial or basin-fill aquifer systems comprising aquifers and aquitards. Various ground-based and remotely sensed methods are used to measure and map subsidence. Many areas of subsidence caused by Groundwater pumping have been identified and monitored, and corrective measures to slow or halt subsidence have been devised. Two principal means are used to mitigate subsidence caused by Groundwater withdrawal—reduction of Groundwater withdrawal, and artificial recharge. Analysis and simulation of aquifer-system compaction follow from the basic relations between head, stress, compressibility, and Groundwater flow and are addressed primarily using two approaches—one based on conventional Groundwater flow theory and one based on linear poroelasticity theory. Research and development to improve the assessment and analysis of aquifer-system compaction, the accompanying subsidence and potential ground ruptures are needed in the topic areas of the hydromechanical behavior of aquitards, the role of horizontal deformation, the application of differential synthetic aperture radar interferometry, and the regional-scale simulation of coupled Groundwater flow and aquifer-system deformation to support resource management and hazard mitigation measures.
Lisa Pfeiffer - One of the best experts on this subject based on the ideXlab platform.
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the effects of energy prices on agricultural Groundwater Extraction from the high plains aquifer
American Journal of Agricultural Economics, 2014Co-Authors: Lisa PfeifferAbstract:We examine the effects of energy prices on Groundwater Extraction using an econometric model of a farmer's irrigation water pumping decision that accounts for both the intensive and extensive margins. Our results show that energy prices have an effect on both types of margins. Increasing energy prices would affect crop selection decisions, crop acreage allocation decisions, and farmers' demand for water. Our estimated total marginal effect, which sums the effects on the intensive and extensive margins, suggests that a $1 per million btu increase in the energy price would decrease water Extraction by an individual farmer by 5.89 acre-feet per year, a decrease of 3.6 percent of the average annual Extraction rate. Our estimated elasticity of water Extraction with respect to energy price is -0.26.
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does efficient irrigation technology lead to reduced Groundwater Extraction empirical evidence
Journal of Environmental Economics and Management, 2014Co-Authors: Lisa PfeifferAbstract:Encouraging the use of more efficient irrigation technology is often viewed as an effective, politically feasible method to reduce the consumptive use of water for agricultural production. Despite its pervasive recommendation, it is not clear that increasing irrigation efficiency will lead to water conservation in practice. In this paper, we evaluate the effect of a widespread conversion from traditional center pivot irrigation systems to higher efficiency dropped-nozzle center pivot systems that has occurred in western Kansas. State and national cost-share programs subsidized the conversion. On an average, the intended reduction in Groundwater use did not occur; the shift to more efficient irrigation technology has increased Groundwater Extraction, in part due to shifting crop patterns.
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The Effects of Energy Prices on Groundwater Extraction in Agriculture in the High Plains Aquifer
2013Co-Authors: Lisa PfeifferAbstract:In this paper we examine the effects of energy prices on Groundwater Extraction using an econometric model of a farmer’s irrigation water pumping decision that accounts for both the intensive and extensive margins. Our results show that energy prices have an important effect on both the intensive and extensive margin. Increasing energy prices would affect crop selection decisions, crop acreage allocation decisions, and the demand for water by farmers. Our estimated total marginal effect, which sums the effects at the intensive and extensive margins, is that an increase in the natural gas futures contract price of 1 cent/1000 btu would decrease water Extraction by an individual framer by 102.88 acre-feet per year, which is approximately 63% of the average amount pumped in a year by a farmer.
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does efficient irrigation technology lead to reduced Groundwater Extraction empirical evidence
2010 Annual Meeting July 25-27 2010 Denver Colorado, 2010Co-Authors: Lisa PfeifferAbstract:Policies that encourage the use of more efficiency irrigation technology are often viewed as effective, politically feasible methods to reduce the consumptive use of water for agricultural production. Despite their widespread use, these policies have not been subject to empirical evaluation. In this article, we evaluate the effect on Groundwater Extraction of a widespread conversion from traditional center pivot irrigation systems to higher efficiency dropped-nozzle center pivot systems that has occurred in western Kansas. State and national cost-share programs subsidized the conversion. We find that the programs have not had the intended effect; the shift to more efficient irrigation technology has not decreased the amount of water applied to a given crop, and has actually increased Groundwater Extraction through changing cropping patterns.
Devin L. Galloway - One of the best experts on this subject based on the ideXlab platform.
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Review: Regional land subsidence accompanying Groundwater Extraction
Hydrogeology Journal, 2011Co-Authors: Devin L. Galloway, Thomas J. BurbeyAbstract:RésuméL’exploitation des eaux souterraines peut générer une subsidence du sous-sol associée à la compaction de systèmes aquifères prédisposés, tels que des systèmes aquifères alluviaux de sédiments meubles ou des systèmes aquifères de bassins sédimentaires comprenant des niveaux aquitards et aquifères. Différentes méthodes au sol ou de télédétection sont utilisées afin de mesurer et de cartographier la subsidence. De nombreuses zones de subsidence associées à une exploitation des eaux souterraines ont été identifiées et surveillées, et des mesures correctives pour réduire ou stopper la subsidence ont été conçues. Deux principales actions sont utilisées pour atténuer la subsidence liée à l’exploitation des eaux souterraines : réduction des prélèvements et recharge artificielle. Des analyses et simulations de la compaction de systèmes aquifères intégrant les relations de base entre potentiels hydrauliques, tensions, compressibilité et écoulement souterrain sont réalisées selon deux approches – une basée sur la théorie classique des écoulements souterrains et l’autre basée sur la théorie de l’élasticité linéaire de la porosité. Des recherches et développements sont néanmoins nécessaires pour améliorer l’évaluation et l’analyse de la compaction des systèmes aquifères, la mise en place de la subsidence et les ruptures potentiels du sous-sol, et pour apporter des mesures pour la gestion de la ressource et pour l’atténuation des risques de subsidence, dans les domaines suivants : comportement hydromécanique des aquitards, rôle de la déformation horizontale, application de l’interférométrie radar d’ouverture synthétique différentielle et simulation couplée à l’échelle régionale des écoulements souterrains et des déformations au sein des systèmes aquifères.ResumenLa extracción de agua subterránea puede generar subsidencia del terreno causando la compactación de sistemas acuíferos susceptibles, típicamente sistemas acuíferos aluviales no consolidado o de relleno de cuenca que comprenden acuíferos y acuitardos. Se utilizan varios métodos de sensoramientos sobre el terreno y remotos para medir y mapear la subsidencia, Muchas áreas de subsidencia causadas por el bombeo del agua subterránea han sido identificadas y monitoreadas, y se han desarrollado medidas correctivas para retrasar o detener la subsidencia. Se usan dos medios principales para mitigar la subsidencia causada por la extracción de agua subterránea – la reducción de la extracción del agua subterránea y la recarga artificial. El análisis y la simulación de la compactación del sistema acuífero se sigue a partir de las relaciones básicas entre carga, tensión, compresibilidad y flujo subterráneo y son evaluados usando primariamente según dos aproximaciones – una basada en la teoría convencional de flujo de agua subterránea y otro basado en la teoría lineal de la poroelasticidad. La investigación y el desarrollo para mejorar la evaluación y el análisis de la compactación de sistemas acuíferos, la subsidencia que acompaña y la ruptura potencial del terreno necesarias en las áreas temáticas del comportamiento hidromecánico del acuitardo, el rol de la deformación horizontal, la aplicación de interferometría diferencial del radar de apertura sintética, y la simulación a escala regional del acoplamiento del flujo de agua subterránea y la deformación del sistema acuífero para sostener el manejo de los recursos y las medidas de mitigación de riesgos.AbstractThe Extraction of Groundwater can generate land subsidence by causing the compaction of susceptible aquifer systems, typically unconsolidated alluvial or basin-fill aquifer systems comprising aquifers and aquitards. Various ground-based and remotely sensed methods are used to measure and map subsidence. Many areas of subsidence caused by Groundwater pumping have been identified and monitored, and corrective measures to slow or halt subsidence have been devised. Two principal means are used to mitigate subsidence caused by Groundwater withdrawal—reduction of Groundwater withdrawal, and artificial recharge. Analysis and simulation of aquifer-system compaction follow from the basic relations between head, stress, compressibility, and Groundwater flow and are addressed primarily using two approaches—one based on conventional Groundwater flow theory and one based on linear poroelasticity theory. Research and development to improve the assessment and analysis of aquifer-system compaction, the accompanying subsidence and potential ground ruptures are needed in the topic areas of the hydromechanical behavior of aquitards, the role of horizontal deformation, the application of differential synthetic aperture radar interferometry, and the regional-scale simulation of coupled Groundwater flow and aquifer-system deformation to support resource management and hazard mitigation measures.摘要地下水开采引起敏感性含水层系统压实,进而产生地面沉降。典型的敏感性含水层系统有松散冲积和盆地充填含水层系统,由含水层和弱透水层组成。有多种基于地面资料和遥感数据的方法可以测量并刻画地面沉降。诸多因地下水开采而引起的地面沉降区,已得到识别和相应监测,并有减缓或者阻止地面沉降的校正措施提出。对于地下水开采引起的地面沉降, 两种用来减缓的主要措施为:减少地下水开采量与人工回灌。含水层系统压实的分析与模拟从属于水头、压力、可压缩性和地下水流的基本关系,且主要采用两种方法实现:一是基于普通的地下水流理论;二是基于线性弹性力学理论。改进含水层系统压实评价与分析以及相应的沉降和潜在地面断裂的研发需要关注以下领域:包括弱透水层的流体力学特征,水平变形的作用,多种差分合成孔径雷达干涉测量的应用,区域尺度上地下水流和含水层系统的变形模拟等,以支持资源管理和减灾措施。ResumoA extracção de água subterrânea pode ocasionar a subsidência dos terrenos em resultado da compacção em sistemas aquíferos susceptíveis, tipicamente sistemas aquíferos aluviais ou de enchimento de bacias, compreendendo aquíferos e aquitardos. Para medir e mapear a subsidência são usados vários métodos baseados em leituras no terreno ou em detecção remota. Numerosas áreas com subsidência causada por bombagem de água subterrânea têm sido identificadas e monitorizadas, assim como têm sido desenvolvidas medidas correctivas para atrasar ou parar a subsidência. Utilizam-se dois processos principais para mitigar a subsidência causada por extracção de água subterrânea: a redução da taxa de bombagem e a recarga artificial. A análise e a simulação da compacção de sistemas aquíferos decorrem das relações básicas entre carga hidráulica, estados de tensão, compressibilidade e fluxos de água subterrânea e são tratados através de duas abordagens, uma baseada na teoria convencional do fluxo de água subterrânea e outra baseada na teoria da poroelasticidade linear. Para suportar medidas de gestão do recurso e medidas de mitigação de risco serão necessários a investigação e o desenvolvimento, a análise da compacção de sistemas aquíferos e das resultantes subsidência e potencial rotura de terrenos, em tópicos como o comportamento hidromecânico de aquitardos, o papel da deformação horizontal, a aplicação de interferometria de radar de abertura sintética diferencial e a simulação à escala regional do acoplamento do fluxo subterrâneo com a deformação de sistemas aquíferos.
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review regional land subsidence accompanying Groundwater Extraction
Hydrogeology Journal, 2011Co-Authors: Devin L. Galloway, Thomas J. BurbeyAbstract:The Extraction of Groundwater can generate land subsidence by causing the compaction of susceptible aquifer systems, typically unconsolidated alluvial or basin-fill aquifer systems comprising aquifers and aquitards. Various ground-based and remotely sensed methods are used to measure and map subsidence. Many areas of subsidence caused by Groundwater pumping have been identified and monitored, and corrective measures to slow or halt subsidence have been devised. Two principal means are used to mitigate subsidence caused by Groundwater withdrawal—reduction of Groundwater withdrawal, and artificial recharge. Analysis and simulation of aquifer-system compaction follow from the basic relations between head, stress, compressibility, and Groundwater flow and are addressed primarily using two approaches—one based on conventional Groundwater flow theory and one based on linear poroelasticity theory. Research and development to improve the assessment and analysis of aquifer-system compaction, the accompanying subsidence and potential ground ruptures are needed in the topic areas of the hydromechanical behavior of aquitards, the role of horizontal deformation, the application of differential synthetic aperture radar interferometry, and the regional-scale simulation of coupled Groundwater flow and aquifer-system deformation to support resource management and hazard mitigation measures.
E Stouthamer - One of the best experts on this subject based on the ideXlab platform.
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impacts of 25 years of Groundwater Extraction on subsidence in the mekong delta vietnam
Environmental Research Letters, 2017Co-Authors: P S J Minderhoud, Gilles Erkens, H Van Pham, Laura E Erban, Henk Kooi, E StouthamerAbstract:Many major river deltas in the world are subsiding and consequently become increasingly vulnerable to flooding and storm surges, salinization and permanent inundation. For the Mekong Delta, annual subsidence rates up to several centimetres have been reported. Excessive Groundwater Extraction is suggested as the main driver. As Groundwater levels drop, subsidence is induced through aquifer compaction. Over the past 25 years, Groundwater exploitation has increased dramatically, transforming the delta from an almost undisturbed hydrogeological state to a situation with increasing aquifer depletion. Yet the exact contribution of Groundwater exploitation to subsidence in the Mekong delta has remained unknown. In this study we deployed a delta-wide modelling approach, comprising a 3D hydrogeological model with an integrated subsidence module. This provides a quantitative spatially-explicit assessment of Groundwater Extraction-induced subsidence for the entire Mekong delta since the start of widespread overexploitation of the Groundwater reserves. We find that subsidence related to Groundwater Extraction has gradually increased in the past decades with highest sinking rates at present. During the past 25 years, the delta sank on average ~18 cm as a consequence of Groundwater withdrawal. Current average subsidence rates due to Groundwater Extraction in our best estimate model amount to 1.1 cm yr−1, with areas subsiding over 2.5 cm yr−1, outpacing global sea level rise almost by an order of magnitude. Given the increasing trends in Groundwater demand in the delta, the current rates are likely to increase in the near future.
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assessing the potential of the multi aquifer subsurface of the mekong delta vietnam for land subsidence due to Groundwater Extraction
Prevention and mitigation of natural and anthropogenic hazards due to land subsidence - Ninth International Symposium on Land Subsidence (NISOLS) Nago, 2015Co-Authors: P S J Minderhoud, Gilles Erkens, V H Pham, B T Vuong, E StouthamerAbstract:Abstract. Land subsidence rates of ~ 1–4 cm yr−1 are measured in the low-lying Vietnamese Mekong Delta. These relatively high subsidence rates are attributed to Groundwater Extraction, which has increased drastically over the past decades due to growing domestic, agricultural and industrial demands. As a result, hydraulic heads in aquifers are dropping, on average 0.3–0.7 m yr−1. There is an urgent need to go from measurements to predictions in order to test possible future Groundwater management scenarios and to reduce the increase of flood risk, salt water intrusion and, on the longer term, prevent the delta from drowning. In this study, we aim to assess the subsidence potential of the multi-aquifer subsurface of the Mekong delta due to Groundwater Extraction. The first step is to gain a thorough understanding of the complex sedimentary architecture of the heterogeneous subsurface. Combined with the related geotechnical properties, the subsurface build-up determines the subsidence potential. Here, we present our approach to develop a 3-D geo-hydrological model based on lithological borehole data, geophysical sedimentary properties, palaeogeography and conceptual models of delta evolution.
Ximing Cai - One of the best experts on this subject based on the ideXlab platform.
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Energy Price and Groundwater Extraction for Agriculture: Exploring the Energy Water Food Nexus at the Global and Basin Levels
International Water Management Institute, 2007Co-Authors: Tingju Zhu, Claudia Ringler, Ximing CaiAbstract:As oil prices have climbed to unprecedented heights the concern over sustainable energy use has intensified globally. Increased energy prices could have direct adverse impacts on some of the world’s largest bread bowls like the Indo-Gangetic Plains, Northern China, and the western United States, due to their large and growing reliance on energy?intensive Groundwater Extraction for irrigation. This paper studies the effects of energy prices on global Groundwater Extraction with a global water and food model, IMPACT-WATER, through analyses of a set of alternative scenarios of energy price and water management policies. In addition, increasing energy prices are also simulated at the basin level for the example of the Dong Nai basin in southern Vietnam to examine the impacts on crop production and farmer incomes.
