Ground waterPub Date : 2008-03-01Epub Date: 2008-01-11DOI: 10.1111/j.1745-6584.2007.00395.x
Thomas J Burbey
{"title":"The influence of geologic structures on deformation due to ground water withdrawal.","authors":"Thomas J Burbey","doi":"10.1111/j.1745-6584.2007.00395.x","DOIUrl":"https://doi.org/10.1111/j.1745-6584.2007.00395.x","url":null,"abstract":"<p><p>A 62 day controlled aquifer test was conducted in thick alluvial deposits at Mesquite, Nevada, for the purpose of monitoring horizontal and vertical surface deformations using a high-precision global positioning system (GPS) network. Initial analysis of the data indicated an anisotropic aquifer system on the basis of the observed radial and tangential deformations. However, new InSAR data seem to indicate that the site may be bounded by an oblique normal fault as the subsidence bowl is both truncated to the northwest and offset from the pumping well to the south. A finite-element numerical model was developed using ABAQUS to evaluate the potential location and hydromechanical properties of the fault based on the observed horizontal deformations. Simulation results indicate that for the magnitude and direction of motion at the pumping well and at other GPS stations, which is toward the southeast (away from the inferred fault), the fault zone (5 m wide) must possess a very high permeability and storage coefficient and cross the study area in a northeast-southwest direction. Simulated horizontal and vertical displacements that include the fault zone closely match observed displacements and indicate the likelihood of the presence of the inferred fault. This analysis shows how monitoring horizontal displacements can provide valuable information about faults, and boundary conditions in general, in evaluating aquifer systems during an aquifer test.</p>","PeriodicalId":94022,"journal":{"name":"Ground water","volume":" ","pages":"202-11"},"PeriodicalIF":2.6,"publicationDate":"2008-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1745-6584.2007.00395.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41065056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ground waterPub Date : 2008-03-01Epub Date: 2008-01-11DOI: 10.1111/j.1745-6584.2007.00394.x
Vincent C Tidwell, Cors van den Brink
{"title":"Cooperative modeling: linking science, communication, and ground water planning.","authors":"Vincent C Tidwell, Cors van den Brink","doi":"10.1111/j.1745-6584.2007.00394.x","DOIUrl":"https://doi.org/10.1111/j.1745-6584.2007.00394.x","url":null,"abstract":"<p><p>Equitable allocation of ground water resources is a growing challenge due to both the increasing demand for water and the competing values placed on its use. While scientists can contribute to a technically defensible basis for water resource planning, this framework must be cast in a broader societal and environmental context. Given the complexity and often contentious nature of resource allocation, success requires a process for inclusive and transparent sharing of ideas complemented by tools to structure, quantify, and visualize the collective understanding and data, providing an informed basis of dialogue, exploration, and decision making. Ideally, a process that promotes shared learning leading to cooperative and adaptive planning decisions. While variously named, mediated modeling, group modeling, cooperative modeling, shared vision planning, or computer-mediated collaborative decision making are similar approaches aimed at meeting these objectives. In this paper, we frame \"cooperative modeling\" in the context of ground water planning and illustrate the process with two brief examples.</p>","PeriodicalId":94022,"journal":{"name":"Ground water","volume":" ","pages":"174-82"},"PeriodicalIF":2.6,"publicationDate":"2008-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1745-6584.2007.00394.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41063975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ground waterPub Date : 2008-03-01Epub Date: 2008-01-09DOI: 10.1111/j.1745-6584.2007.00408.x
Timothy Durbin, David Delemos, Aparna Rajagopal-Durbin
{"title":"Application of superposition with nonlinear head-dependent fluxes.","authors":"Timothy Durbin, David Delemos, Aparna Rajagopal-Durbin","doi":"10.1111/j.1745-6584.2007.00408.x","DOIUrl":"https://doi.org/10.1111/j.1745-6584.2007.00408.x","url":null,"abstract":"<p><p>While superposition is commonly used to address linear ground water problems, it can also be used to address certain nonlinear problems. In particular, it can be used to address problems with nonlinear head-dependent fluxes, where the problem can be separated conveniently into steady-state and transient-state components. Superposition can be used to simulate the transient-state head changes independently from the steady-state heads. The problems addressable by superposition include phreatophyte discharges, stream-aquifer interactions, spring discharges, and drain discharges. Each of these represents a nonlinear head-dependent flux, where the flux depends on the elevation of the land surface or some other feature. Superposition is applied by referencing elevations to the local steady-state water table and by imposing the negative of the steady-state flux on the transient-state problem.</p>","PeriodicalId":94022,"journal":{"name":"Ground water","volume":" ","pages":"251-8"},"PeriodicalIF":2.6,"publicationDate":"2008-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1745-6584.2007.00408.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41065055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}