University of Twente Student Theses
Small scale dam break flood scenario studies for risk reduction in Jian River, Sichuan, China
Islam, Shah Md. Rajibul (2012) Small scale dam break flood scenario studies for risk reduction in Jian River, Sichuan, China.
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| Abstract: | Lack of a dam break flood study is problem for understanding the dynamics and consequences of dam break floods and hampers the development of appropriate risk reduction measures and strategies. Therefore this study aimed to estimate the dynamics and impact of a landslide-dam break flood in Jian River, Sichuan China; for disaster preparedness. With this regard, three specific objectives guided this research to assess the impact of a landslide dam break flood: to prepare flood maps for different dam break scenarios, to investigate the elements at risk and their vulnerability in the downstream area and to evaluate the results for disaster preparedness. Several scientific methods and techniques were used to achieve these objectives: SOBEK 1D2D flood modelling, elements at risk identification by image interpretation and ground truth survey, stage-damage function of Netherlands for vulnerability assessment, event damage calculation, spatial multi criteria evaluation for risk assessment, local officials’ interview, group discussion with local people, questionnaire survey were carried out. The results reveal that, the spatial extent of the flood for 50% dam break scenario is five times higher than the spillway. Furthermore, the elements at risk investigated in the study area are population, buildings, agricultural products, forest, and essential facilities such as schools, hospitals, fire brigades and police station. Vulnerability results obtained from the stage-damage function shows that in case of 25% dam break and 50% dam break scenarios the level of the vulnerability for different elements at risk are noticeable. The comparison of three different scenarios in SMCE has revealed that the percentage of high risk level has increased consecutively for spill way, 25% and 50% dam break flooding. In addition, risk is highly associated with population and resource distribution. For a developing country case study, small scale flood scenario could be a very effective way for risk assessment especially concerning the data poor environment. In conclusion, lack of awareness among the people about the evacuation policy and potential flood danger make the people more susceptible to flood that indicates the need of awareness generation for effective disaster preparedness. Key words: DTM, SOBEK 1D2D, Friction, Hazard, Elements at Risk, Vulnerability, Event damage, Risk |
| Item Type: | Essay (Master) |
| Faculty: | ITC: Faculty of Geo-information Science and Earth Observation |
| Programme: | Geoinformation Science and Earth Observation MSc (75014) |
| Link to this item: | https://purl.utwente.nl/essays/93419 |
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