INVERSE MODELLING OF LATERAL INFLOW AND FLOOD FORECASTING IN RIVERS
The basic flood routing equations are an approximation of Saint Venant equations. Lateral inflow continuously distributed along rivers is a big problem in mathematical modelling in rivers.Often the lateral inflows are ignored when solving the Saint Venant equations. However，when the lateral inflows are very large neglect them may lead to important errors for calculating the flows downstream.The objective of extracting information contained in discharge time series at upstream and downstream gauging stations of a reach of river is to inverse model lateral inflow using the basic flood routing equation.An approximate time series for the actual lateral inflow along the reach is determined by applying a filter to remove some of the model errors that are inherent to the calculated lateral inflows.Parametric functions are determined for the kinematic wave speed and attenuation parameter by minimising the mismatch between the observed downstream discharges and calculated discharges.The filtered lateral inflow and rainfall time series observed are then the input of a rainfall runoff model (GR4) for parameters calibration to simulate the lateral inflow along the river.The coupling of the lateral inflow model and the flood routing model is finally to forecast flood along the reaches of river.The approach is applied to the River Wye，UK.
flood forecasting kinematic wave speed attenuation parameter lateral inflow inverse modelling filter optimisation rainfall-runoff model
Wang li Wang xiangdong Cao wenhong Roland k.Price
China Institute of Water Resources and Hydropower Research，Beijing 100044 Hydroinformatics，UNESCO-IHE,2601 DA Delft,The Netherlands
国际会议
High-level International Forum on Water Resources and Hydropower(第一届国际水利水电高层论坛)
北京
英文
576-584
2008-10-17（万方平台首次上网日期，不代表论文的发表时间）