四川山区河流,河口浅滩多数是沙卵石河床,游荡不定,治理比较困难。所以,我们试想通过对沙卵石河口浅滩的原型观测来弄清其成滩原因、冲淤变化的演变规律情况等,进而提出设计治理一般沙卵石河口浅滩的方案。为此,我们选择具有代表性的沱江口小北门滩在疏浚治理施工时和施工后进行了两期三年的原型观测,通过观测和分析,使我们对确定沙卵石河床河口浅滩挖槽设计 Sichuan mountain rivers, estuaries shoal mostly sandy pebbles, wandering, governance more difficult. Therefore, we try to find out the causes of the formation of sand banks and the evolvement rules of erosion and silting changes through the prototype observation of sand and gravel estuarine shoals, and then put forward the plan of designing and managing the shoals of general gravel estuaries. For this reason, we selected Xiaobeimen Beach, a typical Tuojiang River estuary, for two-year and three-year prototype observation during the construction of dredging and construction. Through observation and analysis,