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研究天然河流，特别是感潮河口段河流的泥沙冲淤问题时，由于其复杂性和多变性，使得数学模型成为一种重要研究手段。本文采用天然冲积河道中缓变非恒定一维水流泥沙方程组建立了研究徒骇河感潮河段泥沙冲淤变化的数学模型。数值模拟时对河道进行了梯形断面概化。通过过河道子测站的实测资料对数值计算结果进行验证，二者吻合较好，在此基础上对徒骇河上游坝上处建闸后该河段在各级径流量影响下的冲淤变化趋势作出了模拟。
When studying the sediment erosion of natural rivers, especially the tidal estuaries, the mathematic model has become an important research method due to its complexity and variability. In this paper, a mathematical model was established to study the variation of sediment deposition and erosion in tidal reach of Tuhahe River by using the variable one-dimensional unsteady flow and sediment equations in natural alluvial rivers. During the numerical simulation, the trapezoidal profile is generalized. Based on the measured data of the river sub-station, the numerical results are verified and the two agree well with each other. Based on this, The trend has been simulated.