Calculating Earth Dam Seepage Using Hydrus Software Applications

Nieć, Jakub; Zawadzki, Paweł; Walczak, Zbigniew; Spychała, Marcin

doi:10.15576/asp.fc/2017.16.3.43

Cited by 7 publications

(7 citation statements)

References 6 publications

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“…Sci and Circumiectus (2017) used a two-dimensional HYDRUS numerical model to estimate the amount of flushing. The model is verified with data measured from the dam [12]. Aghajani et al (2018) have investigated the effect of water sealing walls on the flow rate of earth dams with clay core [13].…”

Section: Introductionmentioning

confidence: 70%

The Effects of Grout Curtain Parameters on Uplift and Piping Phenomenon; Case Study: Sattarkhan Dam

Meshkabadi

Zandi

2019

Hydrology

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Design of earth dams and their issues during and after construction is very important for residents downstream of the dam because of the potential risks and possible breakdowns. In the design of dams, various forces influence the dam body, including uplift pressure and piping phenomenon which should be considered in order to ensure the safety of the dam. Among the measures taken to prevent the washing away phenomenon, the reduction of the output gradient, and the leakage discharge from beneath the hydraulic structures, construction of the grout curtain and installation of the drainage are applicable. Therefore, in order to investigate the effect of various parameters such as the gradient angle of the grout curtain, length, and distance and the number of grout curtains, as well as the length of the drainage on the pressure and output gradient of the numerical models, were considered in current study. For this purpose, the SEEP/W software was used for modeling on Sattarkhan Dam as a case study. The results of the analysis showed that the use of the Qa’im grout curtain at the upstream of the dam has the highest resistance against the pressure and piping phenomenon. The results also showed that increase in the length of the curtain of the water seal increases safety against uplift and piping phenomenon. The use of further spacing between the two grout curtains under the core of the dam led to increase in overall pressure or reduction in safety against uplift pressure. Increase in the length of the horizontal drainage reduced the effects of uplift pressure and output gradient. Results show that period of 70 to 110 degree is appropriate for curtain angle and setting curtain in upstream of dam core with angle of 70 to 80 degree is optimum and economic. A length of 30 m is optimum for curtain. The number of 2 curtains is also optimum. Studying various scenarios of distance of 2 curtains in dam core indicates that distance of 6 m is optimum and also length of 18 m for horizontal drainage is optimum.

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Section: Introductionmentioning

confidence: 70%

The Effects of Grout Curtain Parameters on Uplift and Piping Phenomenon; Case Study: Sattarkhan Dam

Meshkabadi

Zandi

2019

Hydrology

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“…The following Ackers-White formula is given. The sediment concentration, c, is then given in weightppm (g•m -3 ) [36]: (4) …where F gr is mobility number (m), h is depth (m•s -1 ), U is the velocity (m•s -1 ), m, n, A, C are compute parameters, and u* shear velocity (m•s -1 ).…”

Section: Sediment Transport Calculations Using the Ssiim Modelmentioning

confidence: 99%

“…Similar to the other type of mode simulation, the same parameters as in the model formula were saved; the extra term in Navier-Stokes equation was applied, turbulence model was based on (k = ω), and the sand slide algorithm was chosen for the angle 30°. In calculating sediment movement we applied Ackers and White's formula (4).…”

Section: Model Dmentioning

confidence: 99%

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Modelling Velocity Distributions and River Bed Changes Using Computer Code SSIIM below Sills Stabilizing the Riverbed

Hämmerling¹,

Walczak²,

Nowak

et al. 2019

Pol. J. Environ. Stud.

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The construction of Jeziorsko Reservoir on the Warta River in 1986 interfered with the continuity of sediment transport, resulting in an intensification of riverbed erosion downstream from the reservoir [1]. Additional factors increasing erosion of the riverbed and river banks downstream from reservoirs are the increased kinetic energy and turbulence of the water flow that occurs primarily in the local scour downstream of a weir or sill. The first sills, PR.-1 and PR.-2, were located in 240 m and 360 m after the dam and were designed in order to prevent riverbed erosion behind the dam and

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“…The use of computer software in predicting seepage under an earth dam has become more popular, but as noted by Šimůnek et al [14] and Li et al [15], it is important that these tools should be properly calibrated and validated, especially on the basis of values measured in the field [16]. Numerical analysis using HYDRUS code can be successfully used to describe seepage under the earth dam in different cases [17]. The attempt to determine the influence of clogged nonwoven geotextile on water flow in soil using HYDRUS (two-dimensional/three-dimensional (2D/3D)) Standard is another challenge.…”

Section: Introductionmentioning

confidence: 99%

Small Dam Drainage with Nonwoven Geotextile after 40 Years of Exploitation

2019

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Synthetic materials such as nonwovens, mats and membranes have been commonly used in civil engineering for many years. The changes of geotextile characteristics in time (permeability, porosity, etc.) are poorly understood. Many authors have presented the changes in the properties of synthetic materials, mainly based on laboratory tests. The studies on geotextile samples taken from working hydraulic structures are not so many. Over 40 years, the reduction in the permeability of nonwoven geotextile was about four-fold. Probably the reason for that reduction is mechanical clogging caused by fine particles which have moved from the earth dam soil to the nonwoven geotextile. Over 40 years of operations, despite the reduction in permeability of the nonwoven geotextile, the drainage worked properly. The experiment was conducted in the field and laboratory and a two-dimensional numerical model built in software package HYDRUS (two-dimensional/three-dimensional (2D/3D)) Standard was proposed. The field measurements allow calibration and validation of the numerical model. The conducted simulations showed that at a maximum water level in the reservoir equal to 3.32 m, the water supply to the drainage is higher from upstream than from downstream. Particularly, water supply from above to the drainage is absent.

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Calculating Earth Dam Seepage Using Hydrus Software Applications

Cited by 7 publications

References 6 publications

The Effects of Grout Curtain Parameters on Uplift and Piping Phenomenon; Case Study: Sattarkhan Dam

The Effects of Grout Curtain Parameters on Uplift and Piping Phenomenon; Case Study: Sattarkhan Dam

Modelling Velocity Distributions and River Bed Changes Using Computer Code SSIIM below Sills Stabilizing the Riverbed

Small Dam Drainage with Nonwoven Geotextile after 40 Years of Exploitation

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