Correction model for flow calculation of plain river network
Complex water movement and fewer measuring points are the unfavorable factors in improving the accuracy of flow calculation of river networks.For this reason,a correction model for a plain river network was developed based on the three-step method in dealing with the water levels at key nodes of a looping river network,with the coefficients in the equation considered to be the media carrying the correction information.The correction information of the model errors at observation stations was transmitted to the other cross sections of the river network to correct the forecasted values of water levels and discharges at the cross sections of neighboring rivers.A case study was conducted in the river network of the Chengtong section of the Yangtze River.Hydrological data in September 2004 were selected for model calculation.The results show that the proposed model can effectively transmit the correction information of model errors in a certain spatial range and has practical significance in improving the accuracy of forecasts for river networks.