Besides the extension length of sedimentation, the factors that effected the river course are channel pattern, process of water and sediment and dredging.
影响河口河道好坏的因素，除淤积延伸长度外，还应包括河槽形态、水沙过程、河口疏浚等。
2
Tarim river lies in Takilamakan desert, so studies on riverbed evolvement process and channel regulation have significance for the river protection.
塔里木河位于塔克拉玛干沙漠，其河床演变和河道整治对保护塔里木河具有重要的意义。
3
Taking the changing tendency forecast of the channel patterns as an example, we have further discussed the application of geomorphic thresholds to the channelprocess in the Lower Yellow River.