Effect Of The Flow And Sediment Processes On Channel Health In The Lower Yellow River

With social economic development, climatic changes and human unreasonably exploitation have caused series of problems such as the river function declination and river health deterioration. The factors affecting river health include natural factors and human factors. The changes of river health resulted from the natural factors or human factors by changing river flow and sediment process. Anywhere, the flow and sediment process is the fundamental factors of river health, and the change of river flow and sediment process is the fundamental cause resulted in deteriorating health, especially in the Yellow River with less water and more sediment.Channel health is the main contents and the foundation of river health, The channel health of the Lower Yellow River is the key to maintaining the whole the Lower Yellow River’s health. The research goals of this paper are to maintain the health of the Lower Yellow River. Based on a large number of measured data from the Lower Yellow River, this paper put the river health assessment and the channel health assessment, study the impact mechanism and laws of the changes in flow and sediment process on the river health by analyzing the river health changes under different flow and sediment processes, study the impact laws of water and sediment process on the river health by analyzing the river health changes. It was concluded that the main factors affecting river health is annual runoff and flood sediment coefficient. The Predictive value from the corresponding fitting formula and fuzzy evaluation value coincide quite well. This result reveals the impact mechanism of flow and sediment process on river health and it is quite good to predict the channel health. The paper points out that maintaining coordination and reasonable water and sediment process is an important measure to maintain river health. It provides the theoretical basis and control objectives for maintaining and restoring river health.