Flow field downstream of the pier were divided two parts, the main channel area, and the pier area. On the basis of the main flow stress, the formula of main flow velocity variation along the distance was deduced. Combined with the formula of bridge pier scour depth in the handbook, the downstream local scour depth, affected by an upstream pier, can be calculated. As a case in point, the calculated scour depth of the Wulongjiang bridge pier was compared with the experimental value and found similar.
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