NIT Rourkela

Seminar Title

Evolution of Dam Breach and Routing of the Flood Waves at the Downstream Reaches

Seminar Type

Synopsis Seminar

Department

Civil Engineering

Speaker Type

Student

Speaker Name

Sachin, Roll No.-514CE10903

Date & Time

17 Jul 2018 4.30PM

Venu

Seminar Room, Civil Engg. Deptt.

Contact

Prof. M. R. Barik Ph:2303

Abstract

Every structure has a limit to which it can build to withstand the forces applied. An unexpected and unforeseen natural event increases the applied forces that trigger the failure of the structure. Potential embankment failure is one of such events which produce flash flood that causes significant loss to human lives and property. To quantify the risk associated with embankment failure, one needs to understand the breaching process effectively. The phenomenon of breach is strongly correlated to embankment geometry, geotechnical and hydraulic properties. There is significant lack of understanding on hydraulic, geotechnical as well as construction aspects of embankments that dominate the breach mechanism. It is also observed that many aspects are neglected in laboratory studies that have significant effect on breach mechanism. Some of them are grain size of soil, compaction effort applied while construction, compaction moisture content, moisture content of embankment soil prior to the overtopping, cracks present in the embankment and others. The present work brings these aspects into the study and is focused to investigate the breach information of overtopping failure of twenty embankments that are constructed with different soil properties, compaction moisture content and compaction effort in the hydraulics lab of NIT Rourkela. The results shows high correlation between the embankment construction and geotechnical parameters with overtopping breach evolution and are presented in empirical equations. Also, Indian dams failure data along with the world data of past dam failures is used to develop the regression equations for breach parameters that suits Indian dam failure conditions. Further, these equations are applied in hydrodynamic model to estimate the consequences of four dam failures on Brahmani River in term of water levels, travel time of flood waves, and flood inundation.

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