Study On The Influences Of Unsteady Flow Of Ganlanba Power Station On Water Level In Manting River Reach

Manting Dashaba is a famous navigation-obstructing shoal on Lantsang. now, thechannel has reached the standard of Ⅴchannel after more than ten years channelimprovements. Ganlanba power station will build with the development of cascadehydropower station in Lantsang, which locate in the upper6km of Manting Dashaba.The discharge unsteady fiow of Ganlanba power station will influences the navigationsafety of Manting river reach. There are many researches on discharge flood and dailyregulation of power stations, but they have large differences because of differentchannel conditions and power station scales. Mathematical model can increase the scopeof experiment and simulate in multiple conditions efficiently and easily, but physicalmodel can`t do that. So this paper use the one-dimensional flow-sediment mathematicalmodel to analyse the influences of navigation in Manting Dashaba river reach by thedischarge unsteady flow of Ganlanba power station. The article can not only analyse theinfluences of navigation in Manting Dashaba river reach, but also offer support fornavigation safety researches by discharge unsteady fiow of power stations, and also isbeneficial to China shipping development.This paper build the flow-sediment mathematical model of Manting river reach,simulate the design discharge unsteady flow of Ganlanba power station, and analyse theinfluences of navigation in Manting Dashaba river reach by discharge unsteady flow ofGanlanba power station befor and after the riverbed undercutting. Main research worksand conclusions are as follows:①The relevant literature and report at home and abroad get examinedsystematically, and the scientific research achievements and development trends aboutthe study has summarized.②Based on actual measurement datas, builded the one-dimensionalflow-sediment mathematical model. Validated the mathematical model`s flowconditions and sediment transport, based on the measurement datas and physical modeldates. The Validation results show that the mathematical model can simulate the flowand sediment transport of Manting river reach well. It is reliable, and can satisfy theengineering demand.③Analysed the bed scour situation of Manting river reach through the numericalmodel, and compared the calculated results with the movable-bed test results. The results show that the calculated results and the movable-bed test results have the samechange rules. The calculated results are reliable.④Based on the sediment transport calculated results, the unsteady flowNumerical simulation plans are confirmed with the topography before and after the bedincised in Manting channel. Though the calculated Navigable dimensions, range ofstage and water surface slope change, analysed the influences of navigation in MantingDashaba river reach. The calculated results show that the unsteady flow of Ganlanbapower station have great influence on navigable dimensions at the tail of Manlongzhouafter the riverbed incised.