过去十年中,在泥沙水力学方面,尤其是关于泥沙的输送、冲蚀和沉淀等现象的基本力学,已有很大的进步。然而发现了,在许多方面,工程师解决泥沙问题应用的工具还是不够的。美国垦殖周在已办的和拟办的工程中,常常遇到有关泥沙的问题。这些问题包括泥沙的采样技术和计算方法,稳定土渠的设计,现有渠道在自然状态掺乱后的稳定性,水库中泥沙的沉积和其对于蓄水损失的影响,建筑物上游河床的升高和下游河床的降低,以及把进入灌溉渠道和水电厂渠道中的泥沙排除方法等。在解决这些问题时,关于泥沙输送、冲刷和沉积的一切已有知识和启发,均已经用过。然而,几乎在每一方面,尤其是在增加各种公式的可靠性和应用范围的意义上,及发展能够用来解决各种问题的实际办法的意义上,都需要研究和发展。本文指出垦殖局在其工作中所经验到的泥沙水力学方面需要更多研究的一些问题。 Over the past decade, great progress has been made in sediment hydraulics, especially in the basic mechanics of sediment transport, erosion and sedimentation. However, it has been discovered that in many ways, engineers are not enough tools to solve the sediment problem. The U.S. Reclamation Week has often encountered problems with sediment in projects that have been and are planned to be implemented. These include the sampling techniques and computational methods for sediment, the design of stable soil channels, the stability of the existing channels after they have been upset by natural conditions, the sediment deposition in reservoirs and their impact on water loss, the upstream river bed As well as the reduction of the downstream riverbed, as well as the methods of removing sediment into the channels of irrigation and hydropower plants. In solving these problems, all the available knowledge and inspiration about sediment transport, erosion and sedimentation have been used. However, research and development is needed in almost every aspect, especially in the sense of increasing the reliability and scope of application of the various formulas and of developing practical solutions that can be used to solve various problems. This paper points out some problems that need to be studied more by the Bureau of Reclamation in terms of sediment hydraulics experienced in their work.