一、冲淤演变特性黄河河工的名言“大水出好河”,反映了黄河的重要演变特性,也适用于近口河道。多年资料表明,多来大水,河口就越变越好;相反地,连年小水,河口就要变坏。河槽、滩地的冲刷和淤积,在河床演变上的效果是不一样的。滩地淤积、河槽冲刷,水流将更集中于河槽内,使河槽变窄深通畅,输水输沙能力大大增强,河道也随而变得稳定;反之 First, the evolution of scouring and deposition Yellow River workers famous saying “good water out of good river”, reflecting the evolution of the Yellow River important characteristics, but also for the near mouth of the river. Years of data show that more and more floods, the estuary becomes better; on the contrary, year after year, the estuary will deteriorate. Fluvial, beach erosion and siltation, the evolution of the riverbed effect is not the same. The sedimentation of the beach and the scouring of the river channel will make the water flow more concentrated in the river channel, narrowing and deepening the river channel, greatly increasing the capacity of transporting water and sediment, and the river channel will also become stable. On the contrary,