Development of a framework for assessing public health risk due to pluvial flooding : a case study of Sukhumvit, Bangkok | |
| Author | Pokharel, Pratima |
| Call Number | AIT Thesis no.UWEM-19-08 |
| Subject(s) | Rain and rainfall--Thailand--Bangkok Floods--Risk assessment--Thailand--Bangkok Health risk assessment--Social aspects--Thailand--Bangkok--Case studies |
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Science in Urban Water Engineering and Management Jointly offered by Asian Institute of Technology, Thailand and UNESCO - IHE, Delft Institute for Water Education the Netherlands |
| Publisher | Asian Institute of Technology |
| Abstract | When sewer overflow due to rainfall in urban area, this lead to public health risk when an individual is exposed to that contaminated floodwater. Nevertheless, still it is not clear the degree of how the contaminants in floodwater pose a risk to public health. This study analysed reported diarrhoeal cases by month and age in Bangkok, Thailand. The results showed that the cases are reported highly in wet season than in dry season. It was also found that in Bangkok probability of infection of diarrhoeal diseases in wet season is higher to the age group between 15 to 44. However, the probability of infection is highest to the kids under 5 years but they are not influenced by wet weather. Further, this study introduced vulnerability that leads to health risk from urban flooding. This study has found some vulnerability variables that contribute to health risk from flooding. Thus, for vulnerability analysis, the study has chosen two variables economic status and age that contribute to health risk. Assuming that the people economic status depends on the types of house they are living, the study shows the spatial distribution of economic status in the vulnerability maps. The vulnerability map result shows that people living in Sukhumvit have low vulnerability to health risk with respect to types of house they are living. In addition, from age, the probability of infection of diarrhoea was analysed. Moreover, field survey was carried out to validate the vulnerability of people. It showed that health vulnerability depends on the economic status, income level and education. The result depicts that people with low income and poor living conditions are more vulnerable to health risk. Further, the dispersion of faecal coliform concentration in the drainage network was simulated carrying out 1D Hydrodynamic Advection-Dispersion modelling with 2-year rainfall event and for the overland flow 1D/2D Hydrodynamic modelling was carried out. The 1D result denotes dry weather flow with higher concentration and a large dilution of concentration on rainfall event starting that cause concentration drop down due to runoff generated after rainfall. Whereas the model produced flood depth, flood duration and faecal coliform concentration maps, which were transferred to ArcGIS to produce hazard and risk maps. In addition, the study also simulates the 5-year and 10-year rainfall simulation to show the variation in health hazard and risk. It was found that even the hazard coverage is very high with 10-year rainfall event among three rainfall events, the risk was observed same with 5-year and 10-year rainfall event. |
| Year | 2019 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) + School of Engineering and Technology (SET) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Urban Water Engineering and Management (UWEM) |
| Chairperson(s) | Sutat Weesakul;Vojinovic, Zoran |
| Examination Committee(s) | Babel, Mukand Singh;Thammarat Koottatep;Torres, Arlex Sanchez; |
| Scholarship Donor(s) | Netherlands Fellowship Programmes (NFP);UNESCO-IHE;Asian Institute of Technology; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology - UNESCO-IHE, 2019 |