:Flood channel is one of the important geomorphologic units. The study of evolution and regulation of flood channels in estuaries will enrich the contents of estuarine dynamic geomorphology in theory and guide the construction of port and navigation channel and so on in practice. Flood channels should include the flood holes, flood channels and flood courses according to the current studies. In fact the research works about flood channels in estuaries from national to international literatures are still rar...