【Author】HU Chun-hong; ZHANG Zhi-hao

【Abstract】 Using the methods of the field data analyses, the relationship between the bank-full discharge in the tail channel and the flow-sediment are studied. The research results show that the bank-full discharge has decreased from 6 000 m3/s at the beginning of the formation of the flow river to 3 000 m3/s in the early of 21th century. The bank-full discharge has double memory effect, that is, the strongest memory lasts nearly two years with the short-term effect, and the deeper memory lasts nearly six years with the long-rang effect. The incoming flow is much bigger and the incoming sediment coefficient is much smaller, so the bank-full discharge becomes much bigger, and on the contrary, the bank-full discharge becomes much smaller. If the bank-full discharge maintains 4 000 m3/s, the annual incoming flow must be bigger than 23.3 billion m3, the incoming flow in annual flood season is bigger than 14.1 billion m3, and incoming sediment coefficient in the flood season is about 0.03.

【Key words】 Yellow River estuary; process of flow-sediment; tail channel; bank-full discharge; response relationship; estuary regulation