Interpolation Calculation Methods for Suspended Sediment Concentration in the Yangtze Estuary
Based on the measurement data on the sediment concentration of section AD4 in the north passage of south branch of the Yangtze estuary on April 26, 2009, interpolation calculation of sectional sediment concentration distribution was conducted using inverse distance to a power method, modified Shepards interpolation, polynomial regression interpolation method, Kriging interpolation method and radial basis function interpolation method provided by SURFER 8.0 software, and the calculated values were compared with the actual measured values. As indicated by the measurement result of interpolation accuracy according to the calculation results of absolute error, relative error, root-meansquare error and goodness value of prediction, the Kriging interpolation method gives the best interpolation accuracy of calculation of sectional sediment concentration distribution. Based on the result this, interpolation calculation and comparison were carried out with BP neural network, radial basic function neural network and generalized regression neural network. It is discovered that generalized regression neural network is characterized by high interpolation accuracy, fast convergence speed and convenient operation, being an effective interpolation method. Interpolation calculation of sediment concentration distribution with neural network can simulate the complicated nonlinear relationship between the sediment concentration and section spatial coordinates, and perform nonlinear optimization. In interpolation with neural network, the interpolation points may be free from the limitation of the output form of other interpolation mesh points, thus facilitating research and application.
suspended sediment interpolation method neural network
D.A.WU G.D.HU
state key laboratory of hydrology-water resources and hydraulic engineering,hhu Nanjing,China yangtze river estuary investigation bureau of hydrology and water resource,yrwrc Shanghai,China
国际会议
上海
英文
634-638
2009-11-20（万方平台首次上网日期，不代表论文的发表时间）