In areas with significant water level fluctuations in inland rivers,steel components of port engineering are subjected to the effects of water flow scouring and sediment impact,leading to severe damage of surface coatings on steel components.Once local coating failure occurs,the steel components are directly exposed to the humid environment,making significant water level fluctuation regions become the most severely corroded areas for steel structures in inland river ports,which poses a serious threat to the bearing capacity and operational safety of wharf structures.To effectively simulate and predict the corrosion characteristics of steel components in these regions,we conduct an accelerated cyclic deterioration test combining water-sediment scouring and steel corrosion,taking into account the environmental grade of inland rivers.By analyzing corrosion test data of steel specimens under different scour-corrosion time,erosion angles,and cycle numbers,we develop a corrosion model for hydraulic steel components,incorporating both laboratory and field data.The results show that the water-sediment scouring and steel corrosion tests can simulate the corrosion state of steel components in regions with significant water level fluctuations.Corrosion depth of steel components in such regions increases from top to bottom,and the corrosion becomes more severe with more cycles.The normal service life of steel components in these regions is far shorter than their designed service life.