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断面泥沙通量估算的误差主要来源于计算方法、测点布局等,通量模式应该建立在通量估算统计误差最小的原则基础之上.在断面网格设计中采用统计误差最小的等面积单元网格,在泥沙通量估算中采用泥沙组分浓度,在流速变量插值上垂向采用对数函数插值,横向采用第一边界三次方样条函数插值.这样建立的潮汐河口悬沙断面通量组分模式较以往的任何模式更完善,断面通量估算的误差最小.将该模式应用于长江河口南港断面悬沙通量估算及其输移机制分析,断面泥沙通量表现为大潮期大进大出、大出大于大进;小潮期小进小出、小出大于小进;主要输移机制是拉格朗日输移和潮泵.
The error of section sediment flux estimation mainly comes from calculation method, measuring point layout, etc. The flux pattern should be based on the principle that the statistical error of flux estimation should be minimum, and the area with the smallest statistical error Element grid, sediment concentration is used in the estimation of sediment fluxes, logarithmic function interpolation is used vertically in interpolation of flow velocity variables, and the first boundary cubic spline function is used in horizontal direction interpolation. The model of cross-section flux component is more perfect than any previous model, and the error of cross-section flux estimation is the least. This model is applied to the estimation of suspended sediment flux of Nangang Section of Yangtze River estuary and its transport mechanism. Big tide big big big big bigger than large big; Small tide small into small out small out small into small; The main mechanism of transport is the Lagrange transport and tidal pump.