Discussion on water surface profile calculation method of Lijiang River based on flood survey
Major floods have occurred frequently in Lijiang River in recent years,and the losses caused by floods is increasing.Guilin is a famous international tourist city,so flood disasters also bring certain international impacts.Therefore,with the development of Guilin's tourism industry and economy,the requirements for flood control are be-coming higher and higher.11 sections along the Lijiang River from Guilin City to Yangshuo County were selected to analyze and calculate the water surface profiles under floods of different frequencies.The survey data of three floods occurred in June of 1998,June of 2008 and July of 2017 were used to calculate the roughness and slope.Analysis was made on the flow data of Guilin Hydrological Station and Yangshuo Hydrological Station at different frequen-cies,and the water level corresponding to the flow was calculated according to Manning formula.Based on above the water surface profiles at different frequencies were calculated,which provide technical support for water surface pro-file calculation of Lijiang River Basin.
calculation of water surface profileflood surveyanalysis of flood frequencyselection and measurement of large sectionroughnessslopeLijiang River