A Numerical Model And Its Application For Icy Flood Season Channels With Natural Bed Topography

Rivers in high latitude areas usually form ice cover, ice jam or ice dam during winters. The traditional open current has turned into covered one by the forming of the ice jam or ice dam, which always changes the conditions of flowing, heat and geometry profiles of the river. Many serious adverse results have been caused by these changes. The forming of ice jam can block the cross sections, make the water level rise up, and submerge houses and farmlands, or even damage the offshore constructions. Besides these, it may interrupt the supply of water plants. The erosion caused by ice jam can deeply affect the deformation of the bed and bank of natural rivers, in where it turns to damage the habitats of fishes and other aquatic and unearth the buried equipments.With the rapid development of our country's economy since the Opening Policy, the industries and agricultures in north areas are highly developed. For this reason, the menace from ice-flood is even more suffering. So it is high time to carry out the study of hydrodynamic research in river ice dynamics.On the foundation of former results, considering the special hydrology and climate characters of Yellow River drainage basin, a numerical model has been formed for water and sediment transportation, and the simulation results has been compared with field data, which can be used as a decision-making aiding for local governments or support the synthesized models in the future:(1) Analyzing the special characters of Yellow River drainage basin, summarizing the general disadvantages of icy flood, a particular analysis has been made for the reasons of such phenomena and currently measurements for defending.(2) A numerical model has been formed on the ground of particular analysis of general roughness and ice-covered water/sediment transportation in Yellow River during icy periods.(3) The model has been used to a study the reach from Ai Shan to Li Jin for results confirmation with some year's field data.(4) Based on the analysis of simulation results, the insufficiencies are suggested and a prospect has been made also.