PIANC Smart Rivers 2022

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The concept of aimed river pattern of waterway regulation is put forward based on the analysis of riverbed evolution in the long river reach, and the aimed river pattern implies three-fold meanings. First, the concept refers historical especially recent river pattern with reasonable beach layout, excellent depth condition, same flow direction for mid and low flow and micro bending thalweg. Second, the quantities of channel regulation would be economical if the favorable opportunity is seized to make the aimed river pattern through effective engineering measures. Third, the reach is more at risk of obstructing-navigation in dry season when the channel is relatively stable, and the proper channel condition in dry season is optimal for aimed river pattern. The study shows that the target river patterns of distinct reaches are different, which makes the layout of projects different. It is different from the meaning of basic alluvial river pattern for aimed river pattern which is closely combined with the beach layout and channel conditions of the studied reach and used to guide the layout of channel regulation works of the studied reach. For example, the overall project should be implemented by stages when the beach protection project with reasonable location and possible great changes should be implemented in the early stage to create an advantageous beach shape if the channel condition of a studied reach is poor and its beach layout and depth condition are much worse than that of aimed one, and then further measure of channel regulation works should be taken.

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