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山区卵砾石河流在西部山区广泛分布,其阻力关系是认识水流泥沙输移规律、模拟山洪演进过程的制约因素。通过在四川龙溪河的现场观测,获得了水力学、泥沙、地貌等要素的数据,分析了阻力系数与卵砾石特征粒径、坡降、流量、河床结构强度等参数的关系,检验了已发表的多个山区河流阻力公式的适用性。结果表明,由于山区卵砾石河流存在不同发育程度的河床结构以及卵砾石的部分可动性,阻力系数与山区河流的流量、坡降、河床结构发育程度参数等有密切关系;Rickenmann及Ferguson阻力公式在龙溪河具有较好的适用性。本文仅仅是山区河流阻力的初步成果,今后将进一步开展阻力关系的深入研究。
The pebbly river in mountainous area is widely distributed in western mountainous area. The resistance relationship is the restriction factor to recognize the law of water and sediment transport and simulate the evolution of mountain torrent. Through the field observation in Longxi River in Sichuan Province, the data of elements such as hydraulics, sediment and geomorphology were obtained. The relationship between the drag coefficient and characteristic parameters of gravel, slope gradient, flow rate and riverbed structure strength was analyzed. Applicability of published mountain river resistance formulas. The results show that the resistance coefficient is closely related to the flow rate, slope gradient and the degree of structural development of riverbed in the riverbed structure of pebbles in mountainous areas and the partial mobility of pebbles. The Rickenmann and Ferguson resistance formulas Longxi River has good applicability. This article is only the initial result of mountain river resistance. In the future, further research on the relationship between resistance and resistance will be carried out.