Investigation of changes in the parameters of ship demolition in the alignment of the bridge crossing

This article presents a study of the possibility of improving safety on inland waterways and reducing accidents of the "ship – bridge" type. Due to the complexity of the wiring of ships in the alignment of the bridge crossing, it is necessary to identify the causes of the bulk of ships on the bridge supports, for which an analysis of the flow behavior and possible demolition of the vessel when passing in the area of bridge supports is performed. Three calculation areas have been identified: I - on the approach to the bridge; II - in the alignment of the bridge crossing; III – behind the bridge. According to the results of the study, formulas were obtained that allow determining the angle of demolition of the vessel depending on its location relative to the bridge crossing. For zone II, it is proposed to introduce a new lateral drift coefficient Kc, which will take into account the effect of longitudinal and circulating currents formed in the narrowing area of the channel at the bridge supports and leading to the bulk of the vessel on them. The proposed Kc coefficient was obtained analytically and statistically by calculating it through various changing parameters depending on a number of factors. Channel characteristics (slope of the free water surface I and roughness of the channel n) and geometric characteristics of bridge supports (width of the support B) are assumed to be changing factors. Factor variation allows us to obtain dependences of the priority influence of parameters on the resulting Kc.