Abstract
Studying the distribution of longshore current velocity has important practical significance for coastal sediment transport and nearshore material transport and diffusion. Based on the experimental results of 1:100 slope and 1:40 slope mild slope longshore current, this essay adopts MATLAB software and uses different functions to fit and analyze the mean longshore current velocity distribution under mild slope in two cases. The results show that the maximum value of 1:100 mean longshore current velocity have a concave trend on the nearshore side, three kinds of functions can properly fit the mean longshore current velocity distribution. In the case of 1:40, three kinds of functions cannot appropriately show the mean longshore current velocity distribution. Therefore, the distribution characteristics that the convex trend is on the coastal side of the 1:40 mild slope can be better described by proposing a custom piecewise function and relevant constraints.
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