Flood discharging capacity of the outlet section of Nandu river based on MIKE21-FM model
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Abstract:
In order to predict and analyze the influence of the construction of Riverside West Park on the flood discharging capacity of the outlet section of Nandu River, we established a two-dimensional flow numerical model based on the hydrody namic model of MIKE21 FM. Firstly , we used the measured flood data of the hydrological stations to calibrate and verify the roughness coefficient of the main channel and tidal flats. We adopted local roughness correction method and local topographic correction method as the generalization methods of the park model. Then, we simulated the water level and flow field changes at the outlet section under three typical conditions of flood and tide combinations. The calculation results of the two generalization methods were basically consistent. The topography and roughness of the river channel would change after the park is built, leading to the increase of the water level and main flow velocity. The water level increase value calculated by the local roughness correction method was slightly larger, but the water level was still lower than the design water level of the flood embankment. The construction of the park would not reduce the discharging capacity of the outlet section of Nandu River. A high-velocity area would appear near Simapo Island. It is necessary to take corresponding measures to prevent scouring .
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