江苏淤泥质潮滩剖面演变现场观测

Surface elevation variation of the Jiangsu mudflats: Field observation

为探究江苏中部沿海双凸型剖面演变特性,在江苏盐城川东港南侧潮间带布设了10个水准观测站,2012年9月至2013年11月对该潮滩剖面演变过程开展了现场观测。结果表明:该潮滩剖面呈现出双凸型特征,平均高、低潮位线附近的滩涂形成淤积率较高的地形凸点;潮间上带受潮流影响小,滩面高程相对稳定;平均高、低潮位之间的区域滩面高程季节性变化明显,总体呈现冲刷状态;潮间下带冲刷显著,滩面坡度增大。全剖面自岸向海呈现"稳定—淤积—稳定—淤积—冲刷"的双凸型剖面特征。

To investigate the characteristics of double-convex cross-shore mudflat profiles, ten benchmarks were set on the intertidal flats in the south of Chuandong River （ Yanchen, Jiangsu）. The surface elevation of the intertidal flats was monthly measured from September 2012 to November, 2013. Two convex points are found close to the mean high and low tidal levels. The upper intertidal flats are less affected by tidal currents and relatively stable. The elevations of the mudflats located between the mean high and low tidal levels vary considerably during different seasons and appear to be erosive at a year-long scale. The lower intertidal fiats are subjected to severe erosion and the associated seaward slope becomes steeper. From the upper to lower mudflat, the cross-shore profile shows a ＇ stable--accretional--stable--accretional--erosional＇ characteristic with two siltation peaks.