A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The Impact of Small Tributaries Flood in the Braided Plain of Large River
Flooding of the braided Brahmaputra-Jamuna River causes significant economic losses in the northern region of Bangladesh every year. Presently, the intensity and timing of floods are mainly captured by the water level at a few selected stations of the river. Flood Forecasting and Warning Centre (FFWC) of the Bangladesh Water Development Board (BWDB) is officially mandated to regularly disseminate the water level for several rivers during the flood season. The water levels along the Brahmaputra-Jamuna at some strategic stations (such as Chilmari, Bahadurabad, Sirajganj etc.) are playing an important role for the above flood warning system in the North-Central part of Bangladesh. The right bank tributaries to the Brahmaputra-Jamuna River—the Teesta and the Dharla—are contributing rapid (flashy in nature) flow to the system, the effects of which are still unidentified. This study investigates the effects of the variations of flood flow of these tributaries on the flooding of the Brahmaputra-Jamuna basin at the local level by using the 2D hydrodynamic model. A 225 km long hydrodynamic model domain was set along the Brahmaputra-Jamuna, including the most vulnerable floodplain of Dharla and Teesta at Kurigram and Jamalpur districts, respectively. The results show that the variation of flow of the tributaries is trivial to the flood level at the stations where BWDB is capturing water-level data. However, the tributaries’ flow has considerable effects on Charland flooding. In addition, the results demonstrate that the flood depth of some places in the char lands varies more than one metre for the variation of the contribution it receives from the tributaries. These observations indicate that the above fact for flood forecasting and warning systems will be important, especially for the Charland area in the Brahmaputra-Jamuna system.
The Impact of Small Tributaries Flood in the Braided Plain of Large River
Flooding of the braided Brahmaputra-Jamuna River causes significant economic losses in the northern region of Bangladesh every year. Presently, the intensity and timing of floods are mainly captured by the water level at a few selected stations of the river. Flood Forecasting and Warning Centre (FFWC) of the Bangladesh Water Development Board (BWDB) is officially mandated to regularly disseminate the water level for several rivers during the flood season. The water levels along the Brahmaputra-Jamuna at some strategic stations (such as Chilmari, Bahadurabad, Sirajganj etc.) are playing an important role for the above flood warning system in the North-Central part of Bangladesh. The right bank tributaries to the Brahmaputra-Jamuna River—the Teesta and the Dharla—are contributing rapid (flashy in nature) flow to the system, the effects of which are still unidentified. This study investigates the effects of the variations of flood flow of these tributaries on the flooding of the Brahmaputra-Jamuna basin at the local level by using the 2D hydrodynamic model. A 225 km long hydrodynamic model domain was set along the Brahmaputra-Jamuna, including the most vulnerable floodplain of Dharla and Teesta at Kurigram and Jamalpur districts, respectively. The results show that the variation of flow of the tributaries is trivial to the flood level at the stations where BWDB is capturing water-level data. However, the tributaries’ flow has considerable effects on Charland flooding. In addition, the results demonstrate that the flood depth of some places in the char lands varies more than one metre for the variation of the contribution it receives from the tributaries. These observations indicate that the above fact for flood forecasting and warning systems will be important, especially for the Charland area in the Brahmaputra-Jamuna system.
The Impact of Small Tributaries Flood in the Braided Plain of Large River
Tarekul Islam, G. M. (editor) / Shampa, Shampa (editor) / Chowdhury, Ahmed Ishtiaque Amin (editor) / Hussain, Md. Manjurul (author) / Shampa (author) / Islam, Juwel (author) / Ahmed, Md. Shibbir (author) / Rahman, Md. Ashiqur (author) / Rahman, Md. Munsur (author)
Water Management: A View from Multidisciplinary Perspectives ; Chapter: 12 ; 231-248
2022-03-26
18 pages
Article/Chapter (Book)
Electronic Resource
English
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