黄河是世界上著名的多泥沙河流。黄河下游河道系粉土细沙质河床，河道宽阔平坦多弯曲。河水的强大水力作用，把河床冲刷、淤积成典型的蜿蜒性河床地貌；不同的地貌形态又反过来影响水流结构，使水面形成不同的水流形态。认识和掌握水流形态与水下地 The Yellow River is the world famous multi-silt rivers. The lower reaches of the Yellow River silt is fine silty riverbed, wide and flat river curved. River water powerful hydraulic action, the riverbed erosion, silting into a typical meandering riverbed landform; different topography in turn affect the water flow structure, the water surface to form a different flow patterns. Understand and master the flow pattern and underwater