水科学进展2013，Vol.24Issue(2)：212-219,8.
淤长型泥质潮滩双凸形剖面形成机制
Mechanisms for the evolution of double-convex cross-shore profile over accretional mudflats
摘要
Abstract
Taking the accretional mudflats on the Jiangsu central coast as an example, a process-based morphodynam-ic numerical model is built. Mechanisms for the evolution of double-convex cross-shore profile are studied for the dominant long-shore tidal current and sufficient supplies of abundant sediments. The result shows that the flow velocity decreases sharply from the subtidal flats to the low waterline, and then decreases slowly landwards. The abrupt change in flow regime brings a high sedimentation rate along the low waterline, and forms the upper convex point in the area. During neap tides, the sedimentation rate will be greater than the erosion rate during spring tides over the middle sub-tidal flats, inducing a higher siltation rate. Furthermore, weak ebb current over the middle intertidal flats is unable to transport sufficient upwind sediment seawards, which induces a lower sediment concentration and a lower siltation rate over the upper subtidal flats during the final stage of ebb tides. Eventually, a low convex point will be formed over the middle subtidal flats. With the accretion of tidal flats, the levels of the upper and lower convex points will have a shift trend to high water level and low water level, respectively. Our results may not be in good agreement with other studies. More field observations are needed to support further researches.关键词
淤泥质潮滩/地貌动力学/凸形剖面/江苏海岸/潮汐不对称性Key words
mudflats/morphodynamics/convex cross-shore profile/Jiangsu coast/tidal asymmetry分类
建筑与水利引用本文复制引用
龚政,张长宽,陶建峰,蔡辉..淤长型泥质潮滩双凸形剖面形成机制[J].水科学进展,2013,24(2):212-219,8.基金项目
国家自然科学基金资助项目(51009062 （）
51179067) （）
