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简述三峡工程变动回水区的青岩子河段概况，分析该河段的自然演变规律及原因，并探讨了川江“走沙水”的形成机理。
The general situation of the Qingyanzi reach in the fluctuating backwater area of the Three Gorges Project is analyzed. The natural evolution regularities and causes of the reach are analyzed. The forming mechanism of the “walking sand” in the Chuanjiang River is also discussed.