海洋地质前沿2024，Vol.40Issue(3)：48-54,7.DOI:10.16028/j.1009-2722.2023.040
三沙湾潮滩涨落潮和大小潮冲淤特征及其动力机制
Scouring and silting characteristics and dynamic mechanism of ebb and flow and spring-neap tidal cycles in Sansha Bay
摘要
Abstract
The variation rules of tidal flat at different scales has always been one of the main contents in the study of surface processes.The high-precision instruments ADV,CTD,and OBS were used to observe the scouring and silting characteristics of ebb and flow and spring-neap tide on May 26 to June 5,2020 in Sansha Bay,Fujian,SE China.Results show that during the tidal cycle,the scouring and silting of the tidal flat are characterized by scour-ing at the beginning of rising tide,silting at the end of falling tide,and stabilizing in the middle period,the aver-age scouring was 4.05 mm within 30 min when water depth is less than 1 m at the beginning of flood tide,and the average siltation was 3.72 mm within 30 min when water depth was less than 1 m at the end of ebb tide,and was in dynamic stability in the middle period.During the spring-neap tide period,the average siltation from mid tide to neap tide was 3.4 mm,and the average scouring from neap tide to spring tide was 8.2 mm.The correlation analys-is on impact factors including velocity,turbulent energy,water depth,and suspended sediment concentration to the scouring and siltation showed that in tidal cycle,fluctuations in velocity and turbulent kinetic energy determ-ined the changes of scour at the beginning of flood tide and siltation at the end of ebb tide.During spring-neap tides,the characteristics of more flood scouring than ebb siltation determined the scouring from spring tide to neap tide,and less flood scouring than ebb siltation determined the siltation from neap tide to spring tide.This study on scouring and silting mechanism in ebb and flow periods and spring and spring tides provided a reference for the study of tidal flat dynamic geomorphology and dynamic sedimentology.关键词
三沙湾/潮滩/潮周期/冲淤/动力机制Key words
Sansha Bay/tidal flat/tidal period/scouring and silting/dynamic mechanism分类
海洋科学引用本文复制引用
赵元楷,张雯彦,彭旦,李茂田,曾剑威,陈静,刘晓强,姚慧锟,刘演,樊春,谭子杰..三沙湾潮滩涨落潮和大小潮冲淤特征及其动力机制[J].海洋地质前沿,2024,40(3):48-54,7.基金项目
中国地质调查局项目"长江下游及东南沿海生态地质调查"(DD20221778) （DD20221778）
国家自然科学基金(41971007 （）
42261144741) （）
