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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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