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REN MEI'E,ZHANG RENSHUN and YANG JUHAI(Department of Geography,Nanjing University)  
Along the 18,000 km coast line of China's mainland,tidal mud flat is widely distributed.The tidal mud flat in Jiangsu Province is perhaps the longest and widest one in China.This paper deals with a prograding tidal mud flat along the open coast in the Wanggang area,Jiangsu Province.The recorded profile of Wanggang flat is 11.5 km long.Along the profile,a 25 hr.survey of the whole tide hydrographe and silts was carried out.Besides,usual laboratory analysis of sediments is made,and lacquer peels were taken.Sediments of the tidal mud flat are largely of silt size,which is closelyrelated to the source of sediments.Most sediments come directly or indir-ectly from the abandoned Huanghe River.The grain size is finest in sup-ratidal and upper intertidal zones,whereas the lower intertidal zone,subjected to wave and stronger tidal currents,is composed of coarser sediments,with some herringbone cross bedding.In the intertidal flat,thinly and coarsely inte'rlayered beddings are well developed.Their genesis is closely related to spring-neap cycle and annual cycle of variation of monthly mean sea level.The lack of flaser bedding in this region is probably due to the fact that its environment of deposition is considerably different from the North Sea Coast of Europe.No.14 typhoon of 1981 brought about widespread scour on the surface of the intertidal flat and deposition of coarse sediments with near horizontal bedding and cross bedding on the scoured surface.Finally,a model of vertical sequences of mud flat of meso-tidal open coast is proposed,a significant feature of which is the presence of many layers of storm deposits.
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