The role of flood surge plays in shaping tidal flat
Intertidal flood surge has been studied since 80s and was first defined in 1989. It was argued that tidal flat is shaped by flood surge and which is characterized by flow acceleration. Previous work also claim that rate of water level change decides the temporal and special variation of the process. However, it lacks of credibility of the effect that flood surge has on tidal flat by acceleration process, and the mechanics is yet unknown. This study focused on suspension sediment concentrations in very shallow water and how flood surge shaped the tidal flat. MIDAS-400 was set on the tidal flat to collect data in field. Analysis implied that seawater densities were directly proportional to the rates of water level changes while there was less correlation between water density and flow acceleration. This indicates that flood surge is characterized by the largest rate of water level change. At the beginning of one flood, the weighty mixture of water and sediment tamps on the flat directly, simultaneously, water on the flat is accelerated and resting sediment is started. The suspended particles are taken by succeeding flood water so that seawater densities keep higher for much longer time. The hypothesis coincided with the field data.
flood surger rate of water level change Hammer effect Jiangsu Province
X.Q.Du
School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, 210093, China
国际会议
The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)
上海
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）