Erodable dam breaching patterns due to overtopping

There have been numerous studies on dam breaching that have been carried out for a long time, but this area still needs further investigation. Dams which have failed due to breach mechanism have caused disastrous effects to the downstream area, such as loss of lives, property damages, economic and e...

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Main Author:	Mat Lazin, Nor Ain
Format:	Thesis
Language:	English
Published:	2014
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/50676/25/NorAinMatLazinMFKA2014.pdf
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id	my-utm-ep.50676
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spelling	my-utm-ep.506762020-07-08T03:48:53Z Erodable dam breaching patterns due to overtopping 2014-04 Mat Lazin, Nor Ain TA Engineering (General). Civil engineering (General) There have been numerous studies on dam breaching that have been carried out for a long time, but this area still needs further investigation. Dams which have failed due to breach mechanism have caused disastrous effects to the downstream area, such as loss of lives, property damages, economic and environmental damages. This is due to the complex process of breaching which involves many factors such as cohesiveness of the embankment material, the height of the dam and the slope of the embankment dam. Hence, the aim of this study was to investigate the breach patterns and breach grows when breaching takes place. Besides, this study is also focused on the breach hydrograph that is produced after the failure of embankment. The embankment dam of 0.1m was tested in 11m length and 0.6m width channel. The equation used to measure the outflow discharge was Q = 8/15 (Cd)(2g)0.5 tan (θ/2) (h)2.5. Different embankment parameters were considered, i.e. the embankment materials (coarse and medium sand), the inflow rates (Q1 = 0.6 m3/s, Q2 = 0.9 m3/s and Q3 = 1.2 m3/s) and the slope of the embankment dam (1V:2H and 1V:3H). Most of the embankment dam tested showed that vertical erosion occurred first until a certain point before lateral action took place. Higher inflow rate produced higher peak outflow and shorter peak time. Besides, higher inflow rate flushed away all the embankment materials towards downstream and formed a wedge shape at the end of the process, as observed from the side view. For different embankment slopes used, the flatter slopes prolonged the erosion process about 7.7 % and also reduced the peak outflow value of about 15.8 %. Different grain sizes of soil were also used in the tests and it proved that the smaller grain size of soil reduced the peak outflow value (6.5%) and prolonged the peak time about 13.3%. Process of dam breach is clearly influenced by the embankment material, the embankment slope and the inflow rate. 2014-04 Thesis http://eprints.utm.my/id/eprint/50676/ http://eprints.utm.my/id/eprint/50676/25/NorAinMatLazinMFKA2014.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:84873 masters Universiti Teknologi Malaysia, Faculty of Civil Engineering Faculty of Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Mat Lazin, Nor Ain Erodable dam breaching patterns due to overtopping
description	There have been numerous studies on dam breaching that have been carried out for a long time, but this area still needs further investigation. Dams which have failed due to breach mechanism have caused disastrous effects to the downstream area, such as loss of lives, property damages, economic and environmental damages. This is due to the complex process of breaching which involves many factors such as cohesiveness of the embankment material, the height of the dam and the slope of the embankment dam. Hence, the aim of this study was to investigate the breach patterns and breach grows when breaching takes place. Besides, this study is also focused on the breach hydrograph that is produced after the failure of embankment. The embankment dam of 0.1m was tested in 11m length and 0.6m width channel. The equation used to measure the outflow discharge was Q = 8/15 (Cd)(2g)0.5 tan (θ/2) (h)2.5. Different embankment parameters were considered, i.e. the embankment materials (coarse and medium sand), the inflow rates (Q1 = 0.6 m3/s, Q2 = 0.9 m3/s and Q3 = 1.2 m3/s) and the slope of the embankment dam (1V:2H and 1V:3H). Most of the embankment dam tested showed that vertical erosion occurred first until a certain point before lateral action took place. Higher inflow rate produced higher peak outflow and shorter peak time. Besides, higher inflow rate flushed away all the embankment materials towards downstream and formed a wedge shape at the end of the process, as observed from the side view. For different embankment slopes used, the flatter slopes prolonged the erosion process about 7.7 % and also reduced the peak outflow value of about 15.8 %. Different grain sizes of soil were also used in the tests and it proved that the smaller grain size of soil reduced the peak outflow value (6.5%) and prolonged the peak time about 13.3%. Process of dam breach is clearly influenced by the embankment material, the embankment slope and the inflow rate.
format	Thesis
qualification_level	Master's degree
author	Mat Lazin, Nor Ain
author_facet	Mat Lazin, Nor Ain
author_sort	Mat Lazin, Nor Ain
title	Erodable dam breaching patterns due to overtopping
title_short	Erodable dam breaching patterns due to overtopping
title_full	Erodable dam breaching patterns due to overtopping
title_fullStr	Erodable dam breaching patterns due to overtopping
title_full_unstemmed	Erodable dam breaching patterns due to overtopping
title_sort	erodable dam breaching patterns due to overtopping
granting_institution	Universiti Teknologi Malaysia, Faculty of Civil Engineering
granting_department	Faculty of Civil Engineering
publishDate	2014
url	http://eprints.utm.my/id/eprint/50676/25/NorAinMatLazinMFKA2014.pdf
_version_	1747817509217632256

Erodable dam breaching patterns due to overtopping

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