闽江通海航道冲淤演变规律分析

Analysis on erosion and silting evolution of the Minjiang River seaward channel

为了解闽江通海航道水下地形冲淤演变规律,基于1999年—2020年闽江口地形、水沙系列资料,分析了闽江通海航道自1999年以来河床演变情况。结果表明:近20 a来闽江通海航道总体呈冲刷趋势,马尾至粗芦岛航段刷深较大,河床总体平均刷深约4.6 m,平均冲刷强度0.22 m/a,近5 a平均冲刷强度0.19 m/a,内外沙航段变化幅度较小,近5 a平均冲刷强度0.07 m/a。研究成果为闽江航运整治提供了科学依据,也为今后闽江通海航道维护和增深工程提供科学依据。

To understand the erosion and siltation evolution of underwater topography in the Minjiang Estuary from 1999 to 2020,the riverbed evolution of the Minjiang Estuary since 1999 was analyzed based on the topography,water and sediment data.The results show that the sea-crossing channel of Minjiang River has a general scouring trend in the past 20 years.The average scouring depth of the Mawei to Culudao section is about 4.6 m,and the average scouring intensity is 0.22 m/a,and the average scouring intensity is 0.19 m/a in recent 5 years.The variation range of the inner and outer sand section is small,and the average scouring intensity is 0.07 m/a in recent 5 years.The research results provide scientific basis for shipping regulation of Minjiang River and promote the economic development along the Minjiang River.It provides scientific basis for future maintenance and deepening project of Minjiang seaward channel.