A numerical model of ground deformation induced by single well pumping

Su, Miau-Bin; Su, Cheng-Lung; Chang, Chiung Wen; Chen, Yuh-Jyh

doi:10.1016/s0266-352x(98)00014-7

Cited by 14 publications

(5 citation statements)

References 6 publications

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“…In this study, we have successfully estimated a S s value at Neicheng (Table 3) using the leveling observations. Previous studies, such as Burbey et al (2006) and Su et al (1998), also showed that pumping-induced vertical land deformations can be at the submillimeter level over a short time and can reach 1 mm after continuous pumping for several days. But their leveling observations were not used for S s estimation because such observations were not designed for this purpose.…”

Section: Improving S S Determinationmentioning

confidence: 84%

“…At short timescales, such as the time span over a pumping test, a single‐well pumping can also introduce millimeter‐level surface deformations (Hsi et al, ; Kihm et al, ). For example, Su et al () showed that pumping will induce 3‐D deformations at locations close to the pumping well using simulations and in situ measurements in a pumping test in Taiwan. Burbey et al () used a controlled pumping test in 62 days and GPS measurements to study the relation between pumping and ground deformation and found that the vertical deformations ranged from 1 to 20 mm, depending on the pumping rate and the soil type.…”

Section: Introductionmentioning

confidence: 99%

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Short‐Time Geodetic Determination of Aquifer Storage Coefficient in Taiwan

et al. 2018

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Specific yield (Sy) and specific storage (Ss) are two hydrogeological parameters often estimated in a costly pumping test (hydraulic method). Pumping or a natural aquifer recession can cause gravity change and surface deformation, useful for Sy and Ss determination by the more economic geodetic method. From 2013 to 2017, over a few days we measured gravity changes at four sites and subsidence at one site in Taiwan by a FG5 gravimeter and a precision level to estimate Sy and Ss. Using short‐time gravity and level records avoids complicated logistic supports and temporal effects. The measured gravity changes are associated with the MODFLOW‐modeled groundwater depletion. We succeeded in estimating Sy at two sites and failed at the other two. One successful case uses rapid postrain declines of gravity and groundwater level. We did leveling only at one site, but here the 500‐min, continuous, submillimeter subsidence records result in a Ss consistent with the hydraulic result. Lessons on the failed cases of Sy are suggested to avoid disrupting factors in gravity surveys. A semiautomatic leveling procedure is proposed to maximize the chance for Ss determination. Our simulations show that gravity changes increase with Sy and decrease with initial hydraulic head and horizontal gravimeter‐pumping well distance, helping to predict if the gravity‐based method works at a site and to best plan a gravity survey. Drilling data show that the Sy values from the hydraulic and geodetic methods represent aquifer storage coefficients over different aquifer layers.

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Section: Improving S S Determinationmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Short‐Time Geodetic Determination of Aquifer Storage Coefficient in Taiwan

et al. 2018

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“…Besides, simulation and optimization techniques have been widely employed to determine the most effective and efficient dewatering system. By constructing numerical models that represent the hydrogeological conditions and incorporating pumping scenarios, engineers can simulate the behavior of groundwater levels and optimize the dewatering system [13,7,14] This paper aims to introduce a numerical approach for the optimal design of dewatering schemes specifically tailored for deep foundation pits. The study focuses on a case in Thu Thiem, Thu Duc City, Ho Chi Minh City, where the piezometric heads remain close to the surface and poses challenges for pit excavation.…”

Section: Introductionmentioning

confidence: 99%

Numerical approach for the optimal design of dewatering schemes for deep foundation pits

Si,

Tan,

Long

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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In recent years, underground spaces have expanded widely in the urban zone. The appropriate estimation number of dewatering well with economical costs and securing soil stability at construction sites is challenging in designing pumping schemes. This paper aims to present the numerical approach for the optimal number of wells for designing a dewatering deep foundation pit. First, the estimated hydraulic conductivity was selected among the Theis, Cooper-Jacod, and reverse groundwater modeling methods. The estimated hydraulic conductivity via reverse groundwater modeling shows the lowest error with the monitoring pumping test. Second, hydraulic conductivity was input to groundwater modeling to estimate the groundwater level of four pumping schemes with the same total pumping rate (20 wells, 17 wells, 14 wells, and 13 wells). The number of wells was optimal from four random pumping schemes concerning the cost and the drawdown outside the pit. As a result, the pumping scheme with 16 wells is suitable, satisfying the cost and safety outside the drawdown of the foundation pit. The numerical approach could apply to estimate the number of wells for dewatering projects with economic costs and less impact on surrounding construction sites.

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“…It is to be proved that Visual Modflow is efficient in groundwater flow modeling and hence the ability to simulate *Address correspondence to this author at the Department of Civil Engineering, Faculty of Engineering, University of Nottingham Malaysia Campus, Jln Broga, Semenyih, Selangor, 43500 Malaysia; Tel: +6 03 89248604; E-mail: vramanibai@gmail.com the system to investigate seawater intrusion hazards. Su et al (1998) [1] proposed a numerical model to study ground deformation caused by lowering of the water table from a single pumping well. The model used the finite element method to study the problem.…”

Section: Introductionmentioning

confidence: 99%

Coastal Erosion Due to Seawater Intrusion into Groundwater Aquifers

Bai¹

2012

TOHYDJ

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Problem Statement: In general, the drinking water systems sourced from ground water (GW) contains chemicals at double the current maximum contaminant levels (MCL) of colloids. However, due to increasing demand of water, groundwater may be subjected to over-exploitation and the natural equilibrium is thus disturbed. A steady-state condition is established between seawater and freshwater in a coastal aquifer. This results in aggressive groundwater-surface water interaction, which may even reach the inland aquifer. Approach: The objectives of this research are to determine the level of contamination of groundwater by seawater intrusion and to identify its hazard. A flow model is created using the study area, Kanchong Darat in state of Selangor in West Malaysia in Visual MODFLOW environment. By a transient-state analysis the environmental impact due to groundwater pumping has been studied and the results of are obtained. Conclusion: The simulation results revealed that GW would get lower, and finally the interface between fresh and saltwater could gradually move inland if the abstraction of GW is continued and become over-exploited. In the model the drawdown (DD) at the top most aquifer (depth of 55 m) has been found with a depression cone of radii around 3650 m after 1 day of pumping; the radii reached 7500 m with depth of DD 55.5 m after 10 days, while after 30 days of pumping; it reached about 10 km with DD 56.8m. These models are useful for better water resource management and to understand the coastal hazards into inland resources wherein 75% of the water resource is based on groundwater system.

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A numerical model of ground deformation induced by single well pumping

Cited by 14 publications

References 6 publications

Short‐Time Geodetic Determination of Aquifer Storage Coefficient in Taiwan

Short‐Time Geodetic Determination of Aquifer Storage Coefficient in Taiwan

Numerical approach for the optimal design of dewatering schemes for deep foundation pits

Coastal Erosion Due to Seawater Intrusion into Groundwater Aquifers

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