Application Research Of Flood Routing Method In Bailong River Flood Forecasting

The disaster, especially landslide、mudflow and flash flood, exist broadly in Bailong basin. Projects about hydroelectric and water-resources development which distribute intensively along the main stream and tributaries, have growing influence on watershed hydrology. It is essential to establish a flood control decision support system. This paper established model to study the evolutionary process of the river flood and forecast floods on partly channel of Bailong river, by using Muskingum method and MIKE11HD model.This paper selected stream segment as well as the attached branches between Lijie hydrologic station and Wudu hydrologic station as the modeling area, established the hydrology modeling of river course flood routing applying Muskingum method, combined hydraulics method with trial and error to calibrate parameters, meanwhile analyzed the flow’s influence on the parameter conditions, got parameter model under different levels of flow and completed the model validation finally. We used MIKE11HD model combined with analysis tools such as ArcGIS at the same reach to establish one-dimensional hydrodynamic model for river network, analysis confirmed the model’s main parameter roughness(n), it met the realistic simulation precision. Comparing the models based on the two different methods, according to the results, good simulation effect had been achieved in calculating the flood on Bailong river, both of them could able to be applied to the river channel flood forecasting. Comparatively speaking, MIKE11model have a higher simulation accuracy.Nowadays, hundreds of hydropower stations had been planning and constructing on Bailong river basin, there are13stations with leading water within the research area. The headwork dam has an impact on the river’s flood discharging ability. Utilizing the established model MIKE11HD, this article installs structures in the overflow weir acordding to the designing parameters of power station.By the way of researching the variation in process of water level or discharge for downstream of the outlet section and the specific section of the river under flooding condition, we find some techniques for settling the issue of Watercourse-Flood Forecast under the influence of cascade hydropower stations.