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A Detailed 2D Hydraulic Model for the Lower Fraser River
The Lower Fraser River (LFR) refers to the Fraser River reach from the Trans-Canada Highway 1 Bridge at Hope, British Columbia to the river mouth at the Salish Sea. Its floodplains and the coastal areas adjacent to the river mouth are inhabited by approximately 3.1 million people. The LFR also has a long history of flooding. A two-dimensional (2D) hydrodynamic model was developed for the LFR using the software MIKE 21 model with flexible mesh. The model extent includes the LFR and its key tributaries–the Harrison and Pitt Rivers. It was calibrated and validated using the 1972, 2012, and 2017–2020 flood events with the flow range from 5000 m3/s to 13,000 m3/s. Two roughness scenarios were developed to adapt the flow range: the roughness scenario for low river levels and the roughness scenario for high river levels. The model results for the 2018 flood event were in excellent agreement with the observed data since the digital elevation model, which was used for the 2D model, was built based on the river bathymetry data surveyed in less than one year before the 2018 freshet. The model results for the other flood events were also in good (2012 and 2017—2020) or reasonable (1972) agreement with the observed data. The model will be used to calculate the LFR design flood profiles. It can also be used for many other LFR hydraulic modeling applications in a regional scale with a broad flow range.
A Detailed 2D Hydraulic Model for the Lower Fraser River
The Lower Fraser River (LFR) refers to the Fraser River reach from the Trans-Canada Highway 1 Bridge at Hope, British Columbia to the river mouth at the Salish Sea. Its floodplains and the coastal areas adjacent to the river mouth are inhabited by approximately 3.1 million people. The LFR also has a long history of flooding. A two-dimensional (2D) hydrodynamic model was developed for the LFR using the software MIKE 21 model with flexible mesh. The model extent includes the LFR and its key tributaries–the Harrison and Pitt Rivers. It was calibrated and validated using the 1972, 2012, and 2017–2020 flood events with the flow range from 5000 m3/s to 13,000 m3/s. Two roughness scenarios were developed to adapt the flow range: the roughness scenario for low river levels and the roughness scenario for high river levels. The model results for the 2018 flood event were in excellent agreement with the observed data since the digital elevation model, which was used for the 2D model, was built based on the river bathymetry data surveyed in less than one year before the 2018 freshet. The model results for the other flood events were also in good (2012 and 2017—2020) or reasonable (1972) agreement with the observed data. The model will be used to calculate the LFR design flood profiles. It can also be used for many other LFR hydraulic modeling applications in a regional scale with a broad flow range.
A Detailed 2D Hydraulic Model for the Lower Fraser River
Lecture Notes in Civil Engineering
Gupta, Rishi (editor) / Sun, Min (editor) / Brzev, Svetlana (editor) / Alam, M. Shahria (editor) / Ng, Kelvin Tsun Wai (editor) / Li, Jianbing (editor) / El Damatty, Ashraf (editor) / Lim, Clark (editor) / Qu, Junying (author)
Canadian Society of Civil Engineering Annual Conference ; 2022 ; Whistler, BC, BC, Canada
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 ; Chapter: 48 ; 775-798
2023-08-17
24 pages
Article/Chapter (Book)
Electronic Resource
English
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