Flood sedimental characteristic and its mark on the middle reaches of Yangtze River

Flood record is a foundation studying flood happen law. In order to establish the identification mark of flood sediment in the flooded area at the middle reaches of the Yangtze River,We study the flood sediments in 1998,1999 and 2002. The results show that the flood sediments are obviously different from the normal channel deposits on sediment body shape, sedimental texture and sediment composition in the middle reaches of Yangtze River. The results of study can provide the feasibility and basis for the history flood events identification in the field.The sedimentary characters of the flooded deposits on crevasse splay sedimentary,flooded flat and shore side are studied and summarized in the paper.