Doctoral Dissertation Research: Sediment Transport by Laminar Overland Flow

Li，Gang SUNY-Buffalo该提案涉及土壤侵蚀模型，特别是在这样一个模型中，地表径流的泥沙输运能力。 未来模型预测土壤侵蚀的能力取决于侵蚀和沉积的预测精度，而侵蚀和沉积又取决于粗糙表面上坡面流的可靠输运能力方程的发展。 这项研究将发展出一个适用于细沟间层流的坡面流方程。 第二个目标是调查悬浮和跃移泥沙对流速剖面和流动阻力的影响。 这些目标将通过使用不同粗糙度元素和不同强度的模拟降雨进行水槽实验来实现。 在第二组实验中，将使用热膜风速计测量速度分布，并根据分布计算流阻。 泥沙输移对浅层层流的影响以前没有研究过。 确定的影响有重要的意义，为我们进一步了解水力学的层流坡面流。 统计分析，特别是多元回归，将用于开发必要的预测方程。

Li, Gang SUNY-Buffalo This proposal deals with a soil erosion model and specifically within such a model the sediment transport capacity of overland flow. The ability of future models to predict soil erosion depends upon the predictive accuracy of erosion and deposition which in turn is contingent upon the development of a reliable transport capacity equation for overland flow on rough surfaces. The proposed research will develop such an equation for laminar interrill overland flow. A secondary goal is the investigation of the effect of suspended and saltating sediment on the velocity profile and flow resistance. These goals will be pursued by performing flume experiments using differing roughness elements and simulated rainfall at differing intensities. In a second set of experiments, a hot-film anemometer will be used to measure velocity profiles and flow resistance will be calculated from the profiles. The effect of sediment transport on shallow laminar flows has not been investigated previously. The determination of the effects has important implications for our further understanding of the hydraulics of laminar overland flow. Statistical analyses, especially mutiple regression, will be used to develop the necessary predictive equations.