Two-dimensional urban flood modeling for real time flood forecasting for Dhaka city, Bangladesh | |
| Author | Alam, Jahangir Md. |
| Call Number | AIT Thesis no.WM-02-06 |
| Subject(s) | Flood forecasting--Bangladesh--Dhaka Hydrologic models--Bangladesh--Dhaka |
| Note | A Thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Flooding is a severe problem for many cities in the world. The situation is more aggravated in developing countries like Bangladesh. The cities are experiencing water logging due to inadequate drainage capacity, poor maintenance of the drainage system and the effect of heavy storm runoff resulting from rapid urbanization. An efficient flood management can help in reducing flood damages and associated risks, considerably. With the growing concern of modeling accuracy, a new recommendation for urban flood modeling approach has come out from the various urban flooding studies all over the world which is a combined two-dimensional modeling for surface runoff with one-dimensional pipe flow model. The present study has been aimed to develop and evaluate such a new approach which has been applied for urban flooding problem in Dhaka City. Recently developed MOUSE-MIKE21 coupling tool has been used for this present study, which is the first time in use with real data. The main difficulty was to formulate the governing equations, couple two models and simulate MOUSE-MlKE21 model smoothly. The different flow exchange concepts have been developed and incorporated in the model during this study. A time centering technique has been tested for smooth transition of flow between surface and pipe flow model so that model can be stable during simulation. The MOUSE-MlK.E21 model has been simulated successfully, and the results have been compared with 1-D model results as well as with observed flooding for evaluation. The model has produced sufficiently accurate result in terms of flood depth, timing of peak flow and flood extent as well for Dhaka City. However, due to some limitations of this new tool, the flow exchange has been predicted in one direction only i.e. from sewer to surface. Another finding is that hydrological model is needed to be incorporated with the surface model so that runoff hydro graph can be assigned on the surface instead of sewer manhole, which is more realistic. The MOUSE-MIKE21 model could not be applied for online operation for Dhaka City since it takes high computational time. Further study is suggested so that computational time can be reduced for online operation. The model is very suitable for flood risk and damage assessment and offline study. |
| Year | 2003 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Mark, Ole ;Sutat Weesakul |
| Examination Committee(s) | Gupta, Ashim Das ;Tawatchai Tingsanchali ;Tripathi, Nitin Kumar |
| Scholarship Donor(s) | Danish International Development Assistance (Danida), Denmark |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2003 |