PIANC Smart Rivers 2022

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The 2020 hydrological year is featured with the high-water level and high flow period far exceeding the previous hydrological years. The sediment deposition in flood season shallowed and impeded the channel. Based on the hydrological analysis of 2020, the impact of the catastrophic flood year on the channel conditions in the upper shallow area of Nangang, and the reasons for the deterioration of the channel conditions in the shallow area are analyzed. Meanwhile, channel maintenance countermeasures, the necessity of emergency dredging, and the specific dredging scheme are proposed accordingly. The results show that: the upper shallow area of Nangang followed the law of silting in flood season and scouring in the dry season during a hydrological year. The channel conditions depend on the comparison between silting in the flood season and scouring after the flood season. In 2020, the flood lasted for a long time, so the water-falling period was relatively insufficient after flood season, and the upper shallow area was not sufficiently scoured, which resulted in navigation obstruction in the upper shallow area. Therefore, emergency dredging was necessary to be implemented on the channel, the dredging site was designed from #10 navigational mark to #9 navigational mark, the dredging bottom elevation was 4.2m below the design water level, and the dredging width was 200 m. Considering the hysteresis of riverbed deformation, it is suggested to pay continuous attention to the water conditions and channel variation in the upper shallow area of Nangang in the future, and to formulate corresponding channel maintenance countermeasures.

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