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天然情况下，河流泥沙组成多为非均匀沙。河流床沙及其粒径组成的非均匀性是影响水流阻力的主要因素之一，研究床沙组成的非均匀性对水流阻力的影响，具有重要的理论和实际意义。本文在大量实验和实测资料的基础上，首次系统考虑床沙级配及其组成的非均匀性对水流阻力的影响，认识了床沙组成非均匀性对水流阻力的影响关系，初步得出非均匀性对水流阻力影响的规律，丰富了人们对床面泥沙组成非均匀性的认识，为进一步深入研究奠定了基础。
Under natural conditions, the sediment of rivers is mostly composed of non-uniform sand. The inhomogeneity of river bed sand and its particle size is one of the main factors affecting water flow resistance. It is of great theoretical and practical significance to study the influence of nonuniformity of bed sand composition on water flow resistance. Based on a large number of experimental and measured data, we first systematically considered the effects of bedding-sand gradation and its compositional heterogeneity on water flow resistance, and realized the relationship between bedding sand compositional heterogeneity and water flow resistance. The influence of uniformity on water flow resistance has enriched the understanding of the heterogeneity of sediment composition on the bed and laid the foundation for further study.