STORM-RELATED TIDAL FLAT SEDIMENTATION ON NORTHERN BANK OF THE HANGZHOU BAY, EAST CHINA

The less human-influenced Caojing Tidal Flat on the northern bank of the Hangzhou Bay has been selected for a detailed study of the effect of typhoon on sedimentation of tidal flats. Before, during and after No. 14 Typhoon, 1981, systematic field observation and sampling and laboratory analyses had been carried out mainly on surface morphology and sedimentary characteristics in different parts of the area studied. Characteristic surface morphology, sedimentary textures and structures, minerals, as well as pollen and spores indicative of storm facies, and the sequence of sedimentary structures of storm deposits are given in this paper. The storm deposits are interbedded with the normal deposits, forming a rhythmic succession. This seems to show that typhoon-induced storm tides, though lasting only a short time, is of great geological importance.