Assessment of groundwater ingress to a partially pressurized water-conveyance tunnel using a conduit-flow process model: a case study in Iran

Gholizadeh, Hossein; Peely, Ahmad Behrouj; Karney, Bryan W.; Malekpour, Ahmad

doi:10.1007/s10040-020-02213-y

Cited by 10 publications

(2 citation statements)

References 40 publications

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“…Additionally, variations in lining thickness occur due to shifts in the surrounding geological conditions; consequently, these tunnels are commonly classified as non-prismatic water conveyance tunnels [2,3]. Because the tunnel is divided by different hydraulic sections, an unpredictable flow pattern, discharge, and vacuum can occur that are harmful to the project [4][5][6][7]. Consequently, it is very important to predict the characteristics of hydraulic performance in the tunnel and to propose corresponding protective measures.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Hydraulic Performance and Arrangement Optimization of Non-Prismatic Water Conveyance Tunnel—A Case Study of Project X

Li,

Yuan,

Zhao

et al. 2024

Water

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The water conveyance tunnel is an important hydraulic structure in water conservancy projects. Typically, it manifests as a non-prismatic tunnel due to variations in the cross-sectional geometry, which give rise to an unpredictable flow pattern that significantly impacts the secure and stable operation of the tunnel. This study takes water conservancy project X as a case and investigates the hydraulic performances of a non-prismatic water conveyance tunnel using a scale model test and numerical simulation; the hydraulic performance, such as flow pattern, discharge, flow velocity, and water depth profile are analyzed for both free flow and submerged flow conditions. The results show that the simulation data fit well with the experimental value observed in the scale model test for free flow; however, a substantial discrepancy emerges under submerged flow conditions. This discrepancy is attributable to the presence of a vacuum in the distortional plan section. Notably, the effect of water entrainment phenomena on flow rate and velocity is diminished in the scale model test, emphasizing the advantage of numerical simulation in predicting hydraulic parameters for the prototype. On this basis, the optimization of the gate shaft arrangement is executed through numerical simulation; the results indicate that the vacuum issues in the contraction section were partially resolved through structure optimization. The simulation values are close to the experimental results, and the modified design of the tunnel can be used in a water conveyance project.

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Section: Introductionmentioning

confidence: 99%

Investigation of Hydraulic Performance and Arrangement Optimization of Non-Prismatic Water Conveyance Tunnel—A Case Study of Project X

Li,

Yuan,

Zhao

et al. 2024

Water

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“…Several methods are available for evaluating fluctuations in groundwater heads, including in situ measurements, numerical hydrological simulation [14], and geophysical techniques such as electrical resistivity and ground-penetrating radar [15][16][17]. In typical groundwater hydrographs, shallow groundwater heads often exhibit fluctuation patterns.…”

Section: Introductionmentioning

confidence: 99%

Correlating Groundwater Storage Change and Precipitation in Alabama, United States from 2000–2021 by Combining the Water Table Fluctuation Method and Statistical Analyses

Oluwaniyi,

Zhang,

Gholizadeh

et al. 2023

Sustainability

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The complexity of aquifers poses a challenge for fully comprehending the impact of climate change on groundwater. In this study, we employed a suite of hydrological and statistical methods, including the water table fluctuation (WTF) method, wavelet analysis, the Hurst exponent, and temporal trend analysis, to assess groundwater storage (GWS) changes and their correlation with precipitation in Alabama, located in the southeastern United States. These approaches were used to evaluate the temporal variability of GWS as derived from well data and large-scale model estimates that incorporated satellite observations. The results unveiled a nuanced and regionally variable relationship between GWS changes and precipitation over the past two decades. While the Mann–Kendall test did not reveal any statistically significant overarching trends in GWS changes, Sen’s slope analysis indicated subtle regional variations, including a minor decline of −0.2 mm/year for GWS in southern Alabama and modest increases of 0.5 mm/year and 0.38 mm/year in the western and northern regions, respectively, from 2000–2021. Wavelet coherence analysis showed significant co-variation between GWS and precipitation in cycles ranging from 8 to 32 months, suggesting potential cyclic or intermittent influences. Furthermore, we detected strong persistence within the groundwater system using the Hurst exponent, indicating the substantial temporal memory impact. These findings are useful for developing effective groundwater management strategies in a changing climate.

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Restoring groundwater levels after tunneling: a numerical simulation approach to tunnel sealing decision-making

et al. 2021

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Assessment of groundwater ingress to a partially pressurized water-conveyance tunnel using a conduit-flow process model: a case study in Iran

Cited by 10 publications

References 40 publications

Investigation of Hydraulic Performance and Arrangement Optimization of Non-Prismatic Water Conveyance Tunnel—A Case Study of Project X

Investigation of Hydraulic Performance and Arrangement Optimization of Non-Prismatic Water Conveyance Tunnel—A Case Study of Project X

Correlating Groundwater Storage Change and Precipitation in Alabama, United States from 2000–2021 by Combining the Water Table Fluctuation Method and Statistical Analyses

Restoring groundwater levels after tunneling: a numerical simulation approach to tunnel sealing decision-making

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