关键词: 冲刷深度; 过江管道; 数学模型; 水槽模型试验验; 富春江;

Abstract: The Fuchun River-crossing position of the natural gas pipeline belongs to a stretch of the Qiantang River estuary.In the case of extreme flooding, the riverbed is seriously scoured.The determination of maximum scour depth in the pipeline section is one of the key problems during pipeline design.In this paper, firstly, the river regime near the project was analyzed, and the two-dimensional mathematical model was established and validated.On this basis, the hydrodynamic calculation for the section was carried out.Secondly, considering the complexity of geological conditions, the WANG Zhaoyin formula was used to estimate the scour depth of the section.Finally, the model scale and model sand were reasonably selected, and a water-tank experiment was performed to obtain the maximum scour depth at each drilling hole position.The lowest scour elevation design values of the section under the designed hydrological conditions of once in 100 years were calculated by subtracting the scour depth of corresponding points from that of the lower envelope over the years.

Key words: scour depth; river-crossing pipeline; mathematical model; water-tank experiment; Fuchun River;