Simulation of Water Level Fluctuations in a Hydraulic System Using a Coupled Liquid-Gas Model

Wang, Chao; Yang, Jiandong; Nilsson, Håkan

doi:10.3390/w7084446

Cited by 14 publications

(7 citation statements)

References 36 publications

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“…Particularly interesting, then, is the oscillatory behavior after the third anomaly. Qualitatively, similar oscillations can be observed in two-phase pipe-relief valve systems in industrial applications, e.g., in hydropower stations (see engineering application presented by Wang et al [47]). Nevertheless, the oscillations at Hartoušov lasted almost 24 h with changing amplitudes and frequencies (see Figure 12C).…”

Section: Tentative Hydro-mechanical Modelsupporting

confidence: 62%

Effect of Pressure Perturbations on CO2 Degassing in a Mofette System: The Case of Hartoušov, Czech Republic

Woith

Vlček

Vylita³

et al. 2022

Geosciences

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Mofettes are gas emission sites where high concentrations of CO2 ascend through conduits from as deep as the mantle to the Earth’s surface and as such provide direct windows to processes at depth. The Hartoušov mofette, located at the western margin of the Eger Graben, is a key site to study interactions between fluids and swarm earthquakes. The mofette field (10 mofettes within an area of 100 m × 500 m and three wells of 28, 108, and 239 m depth) is characterized by high CO2 emission rates (up to 100 t/d) and helium signatures with (3He/4He)c up to 5.8 Ra, indicating mantle origin. We compiled geological, geophysical, geochemical, and isotopic data to describe the mofette system. Fluids in the Cheb basin are mixtures between shallow groundwater and brine (>40 g/L at a depth of 235 m) located at the deepest parts of the basin fillings. Overpressured CO2-rich mineral waters are trapped below the mudstones and clays of the sealing Cypris formation. Drilling through this sealing layer led to blow-outs in different compartments of the basin. Pressure transients were observed related to natural disturbances as well as human activities. External (rain) and internal (earthquakes) events can cause pressure transients in the fluid system within hours or several days, lasting from days to years and leading to changes in gas flux rates. The 2014 earthquake swarm triggered an estimated excess release of 175,000 tons of CO2 during the following four years. Pressure oscillations were observed at a wellhead lasting 24 h with increasing amplitudes (from 10 to 40 kPa) and increasing frequencies reaching five cycles per hour. These oscillations are described for the first time as a potential natural analog to a two-phase pipe–relief valve system known from industrial applications.

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Section: Tentative Hydro-mechanical Modelsupporting

confidence: 62%

Effect of Pressure Perturbations on CO2 Degassing in a Mofette System: The Case of Hartoušov, Czech Republic

Woith

Vlček

Vylita³

et al. 2022

Geosciences

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“…The aforementioned Saint-Venant equations are first-order quasi-linear hyperbolic partial differential equations; generally, an analytical solution cannot be obtained directly, and instead an approximate solution is obtained using a discrete numerical method [21]. After comprehensive comparison, we used the Preissmann four-point weighted implicit difference scheme with good stability, high calculation accuracy, and fast convergence to discretize the Saint-Venant equations [22], and we used the chase method to solve them [23]. The form of the discretization grid [24] is shown in Figure 3.…”

Section: One-dimensional Hydrodynamic Modelmentioning

confidence: 99%

Model and application of inversion data cleaning for flow monitoring stations in the middle route of the South-to-North Water Diversion Project

et al. 2023

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For a long-distance open-channel water transfer project, the correctness of the hydrological state study and hydrodynamic numerical simulation is impacted directly by the spatiotemporal and consistency of the flow monitoring data along the project. Reported here is an inverted data cleaning model for flow monitoring stations based on the principle of water dynamic balance and the longest sequence method of interval flow, targeting the abnormal phenomenon of unequal flow at monitoring stations in the dispatching operation and using the middle route of the South-to-North Water Diversion Project in China as the research object. As an example, a hydrodynamic model is built for verification using flow and water level data after model cleaning as the upper and lower boundaries, respectively, for the middle-route project from the Baihe River to Huangjin River. The findings indicate that the cleaning model enhances the accuracy of flow monitoring data and reduces both the mean absolute error of the water level in front of the gate and the root-mean-square error by 0.0757 and 0.0895 m, respectively. In terms of data spatial consistency and logic, the cleaned flow data are superior to the measured flow data.

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“…The Preissmann four-point implicit difference method was used to discretize the Saint Venant equations due to its advantages of fast convergence, high efficiency, and good stability [40], and the chasing method was used to solve the discrete equation [41]. See [6] for detailed steps.…”

Section: Water Conveyance Structurementioning

confidence: 99%

A Simple Method for the Control Time of a Pumping Station to Ensure a Stable Water Level Immediately Upstream of the Pumping Station under a Change of the Discharge in an Open Channel

Yan

Zhang

Lei

et al. 2021

Water

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For an open channel with cascade pumping stations, the water level immediately upstream of the pumping station should be kept constant to ensure pumping stability and lining safety. In this study, a simple method was proposed to determine the control time of the pumping station to ensure a stable water level immediately upstream of the pumping station using reverse analysis. The variable discharge process and fixed water level were taken as the upstream and downstream boundaries of the one-dimensional open channel hydrodynamic model, and the discharge process of the pumping station was obtained under ideal conditions. The control time was determined by the equivalent water volume change considering the step change of the discharge of the pumping station. A case study was performed using the Jiaodong water diversion project from Songzhuang sluice to Huibu pumping station (G1–P1), and the effects of the initial discharge, variable discharge, and downstream water level on the control time were investigated. The results show that (1) the larger the initial discharge, the shorter the control time; (2) increasing the upstream discharge reduced the control time, while decreasing the upstream discharge increased the control time; (3) the control time decreased with the increase of the water depth immediately upstream of the pumping station.

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Simulation of Water Level Fluctuations in a Hydraulic System Using a Coupled Liquid-Gas Model

Cited by 14 publications

References 36 publications

Effect of Pressure Perturbations on CO2 Degassing in a Mofette System: The Case of Hartoušov, Czech Republic

Effect of Pressure Perturbations on CO2 Degassing in a Mofette System: The Case of Hartoušov, Czech Republic

Model and application of inversion data cleaning for flow monitoring stations in the middle route of the South-to-North Water Diversion Project

A Simple Method for the Control Time of a Pumping Station to Ensure a Stable Water Level Immediately Upstream of the Pumping Station under a Change of the Discharge in an Open Channel

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