Storage Coefficients and Vertical Hydraulic Conductivities in Aquitards Using Extensometer and Hydrograph Data

Cleveland, Theodore G.; Bravo, Rolando; Rogers, Jerry R.

doi:10.1111/j.1745-6584.1992.tb01556.x

Cited by 16 publications

(8 citation statements)

References 11 publications

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“…An exact match to InSAR-based estimates would be produced if S s values were individually adjusted by 60-160%, mean of ±20%, maintaining the 1 : 10 sand-clay ratio. This range is consistent with values reported for these sediment types (e.g., Domenico and Mifflin 1965, Cleveland et al 1992, Burbey 2003. Although storage properties undoubtedly vary among well locations, our results are based on uniform values as we have no map of measured S s for this region.…”

Section: Resultssupporting

confidence: 90%

Groundwater extraction, land subsidence, and sea-level rise in the Mekong Delta, Vietnam

Erban

Gorelick

Zebker

2014

Environ. Res. Lett.

361

282

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Groundwater exploitation is a major cause of land subsidence, which in coastal areas poses a flood inundation hazard that is compounded by the threat of sea-level rise (SLR). In the lower Mekong Delta, most of which lies <2 m above sea level, over-exploitation is inducing widespread hydraulic head (i.e., groundwater level) declines. The average rate of head decline is ∼0.3 m yr −1 , based on time-series data from 79 nested monitoring wells at 18 locations. The consequent compaction of sedimentary layers at these locations is calculated to be causing land subsidence at an average rate of 1.6 cm yr −1 . We further measure recent subsidence rates (annual average, 2006-10) throughout the Delta, by analysis of interferometric synthetic aperture radar (InSAR), using 78 ALOS PALSAR interferograms. InSAR-based subsidence rates are 1) consistent with compaction-based rates calculated at monitoring wells, and 2) ∼1-4 cm yr −1 over large (1000s of km 2 ) regions. Ours are the first mapped estimates of Delta-wide land subsidence due to groundwater pumping. If pumping continues at present rates, ∼0.88 m (0.35-1.4 m) of land subsidence is expected by 2050. Anticipated SLR of ∼0.10 m (0.07-0.14 m) by 2050 will compound flood inundation potential. Our results suggest that by mid-century portions of the Mekong Delta will likely experience ∼1 m (0.42-1.54 m) of additional inundation hazard.

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Section: Resultssupporting

confidence: 90%

Groundwater extraction, land subsidence, and sea-level rise in the Mekong Delta, Vietnam

Erban

Gorelick

Zebker

2014

Environ. Res. Lett.

361

282

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“…The loop‐like hysteresis in extensometer records has been observed and analyzed at many locations, from Riley's early work in California to more recent applications in Colorado [ Harmon , 2002]. Cleveland et al [1992] applied this approach to extensometer data from Houston, TX. They demonstrated that hysteresis occurs in these data, and they used the hysteresis loop to identify parameters associated with elastic and inelastic deformation.…”

Section: Discussionmentioning

confidence: 99%

Storage change in a flat‐lying fracture during well tests

Murdoch

Germanovich

2012

Water Resources Research

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.[1] The volume of water released from storage per unit head drop per volume of an REV is a basic quantity in groundwater hydrology, but the details of the process of storage change in the vicinity of a well are commonly overlooked. We characterize storage change in a flat-lying fracture or thin sedimentary bed through the apparent hydraulic compliance, C f , the change in aperture of the fracture or thickness of the layer per unit change in pressure. The results of theoretical analyses and field measurements show that C f increases with time near the well during pumping, but it drops suddenly and may become negative at the beginning of recovery during a well test. Profiles of C f increase with radial distance from a well, but they are marked by a sharp increase and a sharp decrease at the edge of the region affected by the wellbore pressure transient. The conventional view in groundwater hydrology is that storage change at a point is proportional to the local change in pressure, which requires that the hydraulic compliance is uniform and constant. It appears that this conventional view is a simplification of a process that varies in both space and time and can even take on negative values. This simplification may be a source of uncertainty when interpreting well tests and extensometer records or predicting long-term well performance.

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“…In the first group, the initial K v , S ske , and S skv values for the first case are obtained from the joint analytic method. In the second group, the initial K v , S ske , and S skv values for the first case are, respectively, 5.11 × 10 −2 m/year, 1.1 × 10 −4 m −1 and 4.7 × 10 −4 m −1 , which are determined by Ye and Xue () using the stress‐strain diagram method proposed by Cleveland et al (). The initial

h_{\min}^{u}

and

h_{\min}^{o}

values in the underlying and overlying aquifers are set equal to the smallest values of hydraulic heads within the first observational cycle, namely

h_{\min}^{u} = prefix- 5.35 normalm

and

h_{\min}^{o} = prefix- 0.04 normalm

(Table ).…”

Section: Field Applicationmentioning

confidence: 99%

“…In the first group, the initial K v , S ske , and S skv values for the first case are obtained from the joint analytic method. In the second group, the initial K v , S ske , and S skv values for the first case are, respectively, 5.11 × 10 −2 m/year, 1.1 × 10 −4 m −1 and 4.7 × 10 −4 m −1 , which are determined by using the stress-strain diagram method proposed by Cleveland et al (1992)…”

Section: Inverse Modeling Of Hydraulic Parametersmentioning

confidence: 99%

A Joint Analytic Method for Estimating Aquitard Hydraulic Parameters

Chen

Zhou²,

Illman

2017

Groundwater

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The vertical hydraulic conductivity (K ), elastic (S ), and inelastic (S ) skeletal specific storage of aquitards are three of the most critical parameters in land subsidence investigations. Two new analytic methods are proposed to estimate the three parameters. The first analytic method is based on a new concept of delay time ratio for estimating K and S of an aquitard subject to long-term stable, cyclic hydraulic head changes at boundaries. The second analytic method estimates the S of the aquitard subject to linearly declining hydraulic heads at boundaries. Both methods are based on analytical solutions for flow within the aquitard, and they are jointly employed to obtain the three parameter estimates. This joint analytic method is applied to estimate the K , S , and S of a 34.54-m thick aquitard for which the deformation progress has been recorded by an extensometer located in Shanghai, China. The estimated results are then calibrated by PEST (Doherty 2005), a parameter estimation code coupled with a one-dimensional aquitard-drainage model. The K and S estimated by the joint analytic method are quite close to those estimated via inverse modeling and performed much better in simulating elastic deformation than the estimates obtained from the stress-strain diagram method of Ye and Xue (2005). The newly proposed joint analytic method is an effective tool that provides reasonable initial values for calibrating land subsidence models.

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Storage Coefficients and Vertical Hydraulic Conductivities in Aquitards Using Extensometer and Hydrograph Data

Cited by 16 publications

References 11 publications

Groundwater extraction, land subsidence, and sea-level rise in the Mekong Delta, Vietnam

Groundwater extraction, land subsidence, and sea-level rise in the Mekong Delta, Vietnam

Storage change in a flat‐lying fracture during well tests

A Joint Analytic Method for Estimating Aquitard Hydraulic Parameters

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