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通过对拉日铁路沿线(年木乡-日喀则段)工作区的实地调查,结合工作区泥石流发育与地形地貌、气象、水文、岩体类型、地质构造、新构造运动等因素分析,初步探讨了泥石流的基本性质及分布规律。研究表明,工作区典型泥石流沟(群)44处,“U”型沟谷型泥石流沟23处;“V”型坡面型泥石流21处。泥石流中水石流41处,占93.18%,具有暴雨性、高频性、发生发展具有多期性等特征。泥石流分布受地形地貌控制、地质构造制约、岩体类型影响,表现为区域分异的特征。
Based on the field survey of the work area along the Riyu railway (Nimugu-Shigatse section) and the analysis of the debris flow development in the work area and the topographic and geomorphological, meteorological, hydrological, rock type, geological structure and neotectonic movement, Debris flow of the basic nature and distribution. The study shows that there are 44 typical debris flow ditches (groups) in the work area, 23 “U” type gully debris flow ditches and 21 “V” type slope debris flows. There are 41 water stone flows in the debris flow, accounting for 93.18%. It has the characteristics of heavy rainfall, high frequency, occurrence and development of multi-period. Debris flow distribution is controlled by topography and geomorphology, geological structure constraints and rock mass types, which are characterized by regional differentiation.