MODFLOW Ground-Water Model - User Guide to the Subsidence and Aquifer-System Compaction Package (SUB-WT) for Water-Table Aquifers

Leake, Stanley A.; Galloway, Devin L.

doi:10.3133/tm6a23

Cited by 46 publications

(31 citation statements)

References 9 publications

(20 reference statements)

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“…In addition, subsidence in the basin over the entire period studied was estimated using the described model ranging Improvements of the geological data used in this study (e.g., the soft soils thickness map recently updated by Béjar-Pizarro et al [37]) will allow improvement of our results. Additionally, the coupled groundwater flow and subsidence models, using the Subsidence and Aquifer System Compaction Package (SUB-WT) [48], can be used to refine the original groundwater model and better integrate the deformation data. Thanks to the European Space Agency (ESA) Sentinel-1 constellation, the monitoring of the study area continues today with enhanced characteristics of wide spatial coverage, great temporal resolution (six days' repeat cycle), and high spatial resolution.…”

Section: Resultsmentioning

confidence: 99%

Groundwater and Subsidence Modeling Combining Geological and Multi-Satellite SAR Data over the Alto Guadalentín Aquifer (SE Spain)

et al. 2017

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In the current context of climate change, improving groundwater monitoring and management is an important issue for human communities in arid environments. The exploitation of groundwater resources can trigger land subsidence producing damage in urban structures and infrastructures. Alto Guadalentín aquifer system in SE Spain has been exploited since 1960 producing an average piezometric level drop of 150 m. This work presents a groundwater model that reproduces groundwater evolution during 52 years with an average error below 10%. The geometry of the model was improved introducing a layer of less permeable and deformable soft soils derived from InSAR deformation and borehole data. The resulting aquifer system history of the piezometric level has been compared with ENVISAT deformation data to calculate a first-order relationship between groundwater changes, soft soil thickness, and surface deformation. This relationship has been validated with the displacement data from ERS and CosmoSkyMed satellites. The resulting regression function is then used as an empirical subsidence model to estimate a first approximation of the deformation of the aquifer system since the beginning of the groundwater extraction, reaching 1 to 5.5 m in 52 years. These rough estimations highlight the limitations of the proposed empirical model, requiring the implementation of a coupled hydrogeomechanical model.

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Section: Resultsmentioning

confidence: 99%

Groundwater and Subsidence Modeling Combining Geological and Multi-Satellite SAR Data over the Alto Guadalentín Aquifer (SE Spain)

et al. 2017

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“…The codes operate according to elastic, elastoplastic, or viscoelastoplastic geomechanical constitutive laws and recur to even the most advanced parallel computer architectures, which enable them to deal with highly complex heterogeneous geologies and geometries. The codes most often used to simulate regional-scale land subsidence due to groundwater withdrawal are the MODFLOW-based packages IBS1 (Interbed Storage Package, version 1) [Leake and Prudic, 1991], IBS2 [Leake, 1990], and SUB-WT [Leake and Galloway, 2007]. All these packages fall into category (a), defined above.…”

Section: /2014wr016841mentioning

confidence: 99%

Geomechanics of subsurface water withdrawal and injection

Gambolati

Teatini

2015

Water Resources Research

133

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Land subsidence and uplift, ground ruptures, and induced seismicity are the principal geomechanic effects of groundwater withdrawal and injection. The major environmental consequence of groundwater pumping is anthropogenic land subsidence. The first observation concerning land settlement linked to subsurface processes was made in 1926 by the American geologists Pratt and Johnson, who wrote that ''the cause of subsidence is to be found in the extensive extraction of fluid from beneath the affected area.'' Since then, impressive progress has been made in terms of: (a) recognizing the basic hydrologic and geomechanic principles underlying the occurrence; (b) measuring aquifer compaction and ground displacements, both vertical and horizontal; (c) modeling and predicting the past and future event; and (d) mitigating environmental impact through aquifer recharge and/or surface water injection. The first milestone in the theory of pumped aquifer consolidation was reached in 1923 by Terzaghi, who introduced the principle of ''effective intergranular stress.'' In the early 1970s, the emerging computer technology facilitated development of the first mathematical model of the subsidence of Venice, made by Gambolati and Freeze. Since then, the comprehension, measuring, and simulation of the occurrence have improved dramatically. More challenging today are the issues of ground ruptures and induced/ triggered seismicity, which call for a shift from the classical continuum approach to discontinuous mechanics. Although well known for decades, anthropogenic land subsidence is still threatening large urban centers and deltaic areas worldwide, such as Bangkok, Jakarta, and Mexico City, at rates in the order of 10 cm/yr.

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“…Few past transient models have included calculations of release of water from storage attributed to inelastic compaction of the aquifer system (permanent land subsidence), including groundwater models of the Tucson Basin (Hanson and Benedict, 1994) and Avra Valley (Hanson and others, 1990). The Subsidence and Aquifer-System Compaction Package (SUB-WT; Leake and Galloway, 2007) for use in simulating water-table aquifers with MODFLOW is particularly applicable for groundwater simulations of aquifers in the study area. That package can be used in future MODFLOW-based models in which there is a need to compute vertical compaction and resulting land subsidence.…”

Section: Simulation Of Groundwater Flowmentioning

confidence: 99%

Water availability and use pilot: Methods development for a regional assessment of groundwater availability, southwest alluvial basins, Arizona

Tillman¹,

Cordova²,

Leake³

et al. 2011

Scientific Investigations Report

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MODFLOW Ground-Water Model - User Guide to the Subsidence and Aquifer-System Compaction Package (SUB-WT) for Water-Table Aquifers

Cited by 46 publications

References 9 publications

Groundwater and Subsidence Modeling Combining Geological and Multi-Satellite SAR Data over the Alto Guadalentín Aquifer (SE Spain)

Groundwater and Subsidence Modeling Combining Geological and Multi-Satellite SAR Data over the Alto Guadalentín Aquifer (SE Spain)

Geomechanics of subsurface water withdrawal and injection

Water availability and use pilot: Methods development for a regional assessment of groundwater availability, southwest alluvial basins, Arizona

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