Description on distributary channel sandbodies in Linnan area,Huimin Depression;

Based on core datum,logging informations,seismic datum and geological datum,the author constructs the sedimentary mode of Chang 61 in the area and compartmentalizes five microfacies including subaqueous distributary channel,interd.

Mud gravel is often found in the base of distributary channel sediment,plant root and lignite often develop in the swamp sediment.

Characteristics of water flow and sediment motion in braided river and their effects on fluvial evolution;

There are many braided rivers of two braches or many braches in our country, such as Yangzi River, Beijiang River, Xijiang River, Xinyi River in the north of Jiangsu Province etc.

Spur dike has a critical effect on the diversions of main channel and branch channel in the process of regulating bifurcated channel,and different layout of spur dike has a different effect on diversion ratio.

The goose\|neck bifurcated channel is the one with the most complicated shape, the biggest broaden\|rate and the largest in number in the middle and lower reaches of the Changjiang(Yangtze) river, and its length is almost 40 percent of that of the whole bifurcated channel.

The bifurcated channel is a common river type, and there exists realistic meaning for the study on the division characteristics of the bifurcated channel.