dsm.f90: A computer code for the solution of an inverse problem of ground water hydrology by the differential system method

Giudici, M.; Vassena, Chiara

doi:10.1016/j.cageo.2006.03.008

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…In this example we attempt to reduce the uncertainty on R validating the model with respect to a second set of data, which describes a second flow situation under different conditions. Unfortunately, an independent stationary set of data under exploitation conditions, which could be useful in order to reduce the uncertainty on the K distribution (Giudici et al 1995;Giudici and Vassena 2006), was not available. As a consequence, in order to validate the model, the heads evolution from 1998 to 2004 (seasonal data) has been considered.…”

Section: Simulations In Transient Conditionsmentioning

confidence: 99%

“…Unfortunately, an independent stationary set of data under exploitation conditions, which could be useful in order to reduce the uncertainty on the K distribution (Giudici et al 1995; Giudici and Vassena 2006), was not available. As a consequence, in order to validate the model, the heads evolution from 1998 to 2004 (seasonal data) has been considered.…”

Section: Simulations In Transient Conditionsmentioning

confidence: 99%

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The Sustainable Pumping Rate Concept: Lessons from a Case Study in Central Italy

Romano¹,

Preziosi

2010

Groundwater

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The term sustainable pumping rate (SPR) is defined as the maximum pumping rate that can be maintained indefinitely without mining an aquifer, and is different from the concept of safe yield (SY), which takes into account also aspects related to the much wider concept of sustainability. The assessment of the SPR for the case study of Petrignano d'Assisi, an alluvial aquifer located in Central Italy, shows the need for a reliable estimate of the global water budget of the aquifer, particularly of the recharge under undisturbed conditions; however, the latter is not sufficient, because the SPR is affected also by the geometry of the aquifer, the hydraulic conductivity pattern, the variation of recharge/discharge ratio induced by the abstractions, and so on. All these aspects are analyzed by means of a numerical flow model calibrated both under undisturbed conditions (1974) and under exploitation conditions (1998 to 2004). The steady-state modeling results show that the relation between recharge and abstractions both at local and global scale is a key point in order to estimate a long-term SPR. Moreover, as it could be necessary to overexploit the aquifer for short periods, e.g., during drought episodes, the estimate of SPR must be performed also in transient conditions, in order to take into account the characteristic time of depletion and the successive recovery.

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Section: Simulations In Transient Conditionsmentioning

confidence: 99%

Section: Simulations In Transient Conditionsmentioning

confidence: 99%

The Sustainable Pumping Rate Concept: Lessons from a Case Study in Central Italy

Romano¹,

Preziosi

2010

Groundwater

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“…Like other direct methods of inversion, e.g., the Differential System Method (Parravicini et al, 1995;Giudici et al, 1995;Giudici and Vassena, 2006), the head field has to be known everywhere. Since measurements are available at possibly few, sparse points, an interpolation is necessary.…”

Section: Introductionmentioning

confidence: 99%

Improving the robustness of the Comparison Model Method for the identification of hydraulic transmissivities

Comunian

Giudici

2021

Computers & Geosciences

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The Comparison Model Method (CMM) is a relatively simple and computationally efficient direct method for the identification of the transmissivity of a confined aquifer by solution of an inverse problem. However, it suffers some of the classical drawbacks related to ill-posedness and ill-conditioning of inverse methods. Effectiveness of the CMM can be improved by some approaches. First of all, the introduction of a factor which permits to limit the negative effects of small hydraulic gradients by selection of a single parameter of the algorithm. Moreover, the CMM can be cast in a tomographic framework, i.e., by profiting of multiple sets of data, corresponding to different flow situations, produced by different boundary conditions or sources terms. Numerical tests are performed on a synthetic aquifer, by means of an open-source implementation based on the use of flopy for the solution of the forward problems. The tests show that the above mentioned approaches improve the robustness of the CMM with respect to error on the input head data.

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Hybrid fitting of a hydrosystem model: Long‐term insight into the Beauce aquifer functioning (France)

Flipo¹,

Monteil²,

Poulin³

et al. 2012

Water Resources Research

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[1] This study aims at analyzing the water budget of the unconfined Beauce aquifer (8000 km 2 ) over a 35 year period, by modeling the hydrological functioning and quantifying exchanged water fluxes inside the system. A distributed process-based model (DPBM) is implemented to model the surface, the unsaturated zone and the aquifer subsystems. Based on an extensive literature review on multiparameter optimization and inverse problem, a pragmatic hybrid fitting method that couples manual and automatic calibration is developed. Three data subsets are used for calibration (10 year), validation (10 year) and test (35 year). The global piezometric head root-mean-square error is around 2.5 m for the three subsets and is rather uniformly spatially distributed over 78 piezometers. The sensitivity of the simulation to the different steps of the calibration process is investigated. The transmissivity field permits the fitting of the low-frequency signal for long-term filtering of the recharge signal, whereas the storage coefficient filters the signal with a higher frequency. For long-term insight into aquifer system functioning, the priority is thus to first fit the transmissivity field and to assess the distributed aquifer recharge accurately. The fitted DPBM, coupled with a linear model of coregionalization, is then used to quantify the hydrosystem water mass balance between 1974 and 2009, indicating that there is yet no trend of water resources decrease neither due to climate nor to human activities.

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dsm.f90: A computer code for the solution of an inverse problem of ground water hydrology by the differential system method

Cited by 4 publications

References 16 publications

The Sustainable Pumping Rate Concept: Lessons from a Case Study in Central Italy

The Sustainable Pumping Rate Concept: Lessons from a Case Study in Central Italy

Improving the robustness of the Comparison Model Method for the identification of hydraulic transmissivities

Hybrid fitting of a hydrosystem model: Long‐term insight into the Beauce aquifer functioning (France)

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