Hydro-Climate Symposium

Oral

395463 - ANALYZING URBAN FLOODS IN DHAKA USING EARTH OBSERVATION

Tuesday, June 5
4:00 PM - 5:30 PM
Location: Lake Superior B
Co-Authors: Ali Shafqat Akanda, 203 Bliss Hall, 1 Lippitt Road, Kingston, RI, 02881 – University of Rhode Island

Urban floods have become an increasingly frequent and damaging disaster throughout the world. With rapid urbanization and unplanned expansion occurring in many regions of the world due to high population growth, a large portion of the dwellers in these cities have become vulnerable to natural disasters and are suffering due to floods caused by sudden downpours and intense rainfall events. Dhaka, the capital city of Bangladesh is one of the fastest growing and densely populated cities with unplanned urban expansion. A large number of people are moving from rural areas to Dhaka due to various problems associated to climate change such as river bank erosion, sea level rise. Low lying lands, rivers, canal, and waterbodies are increasingly being filled to construct new accommodations on lands that previously worked as natural drainage channels. Artificial drainage is also hampered due to manmade reasons such as unplanned construction and other land use pattern changes. Therefore, the city experiences urban floods and waterlogging following heavy precipitation almost every year. In recent years, urban floods occur quickly rather than previous years. Previously it took 2-3 days of heavy rainfall for water logging or urban flood; whereas now such events occur within around 6 hours of rainfall. In this paper we shall investigate the possible reasons of urban floods by analyzing earth observation data from the Tropical Rainfall Measuring Mission (TRMM) and recent observations from Global Precipitation Measurement (GPM) data for Dhaka and surrounding areas to observe the relationship among urban floods, the intensity, and fluctuations of the arrival of rainfall and land use change in past and recent years to better understand the problem.
Keywords: urban flood, urban expansion, earth observation, natural drainage system, land use

Farah Nusrat

Graduate Student
University of Rhode Island

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