Effects of Floods from Tributaries Upon Backwater in the Stem Stream of the Yellow River in Inner Mongolia

Using mathematical model tool in this paper, numerical Flow Model is established according to the actual situation of the Inner Mongolia reach of the Yellow River [1-6]. The model verification and calculated results of tributaries inflow show that it can truly reflect flow regime of tributaries flow into the Inner Mongolia reach, and variation among related hydraulic elements. The model can be regarded as one of the research methods of the river planning and construction. Large discharges from tributary in the Inner Mongolia can change main-stream flow regime and water-level obviously. Flow direction Changes, water on the floodplain, backwater is the direct result, which should be paid high attention in the regional flood control planning and river regulation.