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Numerical Modelling of Flow over Spillway
Holinka, Matouš ; Hodák,, Jiří (referee) ; Jandora, Jan (advisor)
This thesis deals with the solution of numerical modeling. Consequently problems associated with the flow of the water over spillway of the specific water structure. In this case numerical modeling means modeling of fluid movement, which is described by mathematical means. Especially nowadays, when a lot of spillways need to be recalculated, whether it meets the capacity demands, or there is no need to tackle reconstruction. With today's software capabilities there is a wide range of commercial and freeware resources. The numerical model, compared to physical model is less accurate which is, on the otherhand, physical model is usually financially and time-consuming. The following work simulates the behavior of water on the edge of the spillway, in the trough and then behind the trough. The result is a comparison of the water depth in the trough calculated by the numerical and the physical model.
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Study of Possibility to Build Small Dams near Vyškov
Richter, Štěpán ; Žatecký, Stanislav (referee) ; Jandora, Jan (advisor)
This thesis deals with the design of small reservoirs at Vyškov na Moravě. Projected reservoirs’ dams are earth-fill and homogenous and each one is equipped with the bottom water outlet and the emergency spillway. The first reservoir, located on the tributary of the Drnůvka river, has the fountain type emergency spillway and the feed pipe bottom water outlet. The reservoir of the Merchanice river, situated at the Vyškov airport, is equipped with the lateral emergency spillway and the feed pipe bottom water outlet. The third design is the reconstruction of the Marchanka reservoir projecting the dam raise. For this small reservoir two variants of functional installations were elaborated.
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Mathematical modelling of wind waves
Bendová, Gabriela ; Golík, Pavel (referee) ; Jandora, Jan (advisor)
The work deals with mathematical modeling of wind waves on water reservoirs and their effects on different types of slopes. The research work was carried out using a vast array of available literature written on this topic in the Czech Republic and partly abroad. And we also deal with the hydrodynamics problems, creating mathematical and numerical model Further simulations were created in two numerical models. Simulations were created in two programs FLOW-3D and DualSPHysics. Vast variety of situations was created in DualSPHysics program because it seems more appropriate for modeling of this situation. It was created twenty-seven simulations and their results are compared with results coming from valid Czech standard ČSN 75 0255.
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Modelling of Flow over Spillway of a Dam
Desatová, Martina ; Holomek, Petr (referee) ; Jandora, Jan (advisor)
This thesis deals with mathematical modelling of water flow through the safety object. It explains the principle of mathematical modelling and its laws. There is also present-ed the mathematical models used by numerical modelling. The results of mathemati-cal model Koryčany are included in this thesis compared with hydraulic calculations and physical model.
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Safety Assesment of the Rouchovany Dam during Floods
Menšík, Kryštof ; Jobánek, Stanislav (referee) ; Jandora, Jan (advisor)
The main goal of the bachelor’s thesis is the safety assessment of the Rouchovany Dam during floods in accordance with ČSN 75 2935. The thesis contains information about hydraulic structure itself and of its segments, hydraulic calculations, set up permissible water level and control maximal water level. The result of the thesis is the evaluation of current condition of body of hydraulic structure and proposing corrective measures.
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Numerical Modelling of Flow over Spillway in Small Dams
Vaněk, Jakub ; Roth, Tomáš (referee) ; Jandora, Jan (advisor)
The master´s thesis deals with the numerical modeling of flow in the emergency spillways of small dams. It is solved the flow rate capacity of a weir and of spillway called „duckbill-type“. Sharp crested weirs and long crested weirs are modeled using numerical simulations in ANSYS. Hydraulically complex spillway called „duckbill-type“ was modeled in the Flow-3D. The results of the discharge coefficients are compared with data in the hydraulic literature.
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Numerical Modelling of Weir Overflow
Šilhánková, Lenka ; Roth, Tomáš (referee) ; Jandora, Jan (advisor)
This thesis deals with the numerical modeling of water overflow over the front spillway. The aim of the thesis is to calculate various types of turbulent models and to assess the overflow coefficient on a sharp front spillway. The model was created in free software SketchUp, but the modeling itself was carried out in FLOW-3D software. The content of the work is a description of used software, design and calculation.
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Dam Breach of Eartfill Dams Due to Internal Erosion
Kotaška, Stanislav ; Hodák, Jiří (referee) ; Satrapa, Ladislav (referee) ; Jandora, Jan (advisor)
Dam breaches are relatively rare but can be catastrophic. In the event of a earthfill dam breach, a special flood will occur that can cause loss of life and property. While it is difficult to prevent a earthfill dam breach, it is important to focus on protecting the population. Depending on the type of damage expected to the earthfill dam, different measures are taken to protect people. After analysing possible dam failures and calculating the consequences, risks are assessed and then reduced by relocating people and property. Accurate analysis of potential failures and prediction of the flood wave is necessary to predict how a given special flood will propagate in the floodplain below the dam. The thesis clearly summarises the mechanism of earthfill dam breach due to internal erosion and presents mathematical methods for modelling this phenomenon. The main result is an increase in the predictive capability of the AREBA software used to simulate breaches of earthfill dams due to internal erosion and overtopping. An extension to the AREBA software has been introduced to allow the setting of different levels of comparison plane, consumption curves and reservoir characteristics. In addition, the AREBA software has been extended to include water balance equation and additional methods for dealing with water levels below the dam. New methods have also been added to deal with roof collapse of the seepage pipe, friction losses in the seepage pipe and dealing with the roughness coefficient calculations. A Monte Carlo method with LHS sampling was introduced to generate the input parameters. After applying the proposed improvements, a sensitivity analysis was carried out to identify the most sensitive geotechnical model parameters. In addition, other software’s for simulating the failure of earthfill dams due to internal erosion was presented (EMBREA, DL Breach, WinDAM C) and its results were compared with the modified AREBA software on selected case studies.
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Reconstruction of the Pod kravínem Dam
Lehotská, Lívia ; Dvořák, Bořek (referee) ; Jandora, Jan (advisor)
This diploma thesis deals with the reconstruction of small reservoir in collaboration with the company VZD Invest s. r. o. The first part aims at the basic description of the thesis subject – the small reservoir. Characteristics of small reservoir and calculations are processed in the second part. The third part is focused on the description of the current conditions. The main part consist of characteristics calculations of the small reservoir and proposal of the necessary reconstruction for future technical function. In conclusion, safety assessment of the proposed measures are evaluated.
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