【摘要】 本文通过对与一场降雪能否成灾有关的各种因素进行分析，确定了对一场降雪能否成灾进行判断的判别因子体系，并通过对西藏那曲地区十多年历史积雪气候资料的统计分析，确定了判别因子的分级标准。且运用这些判别因子和分级标准，在判别模型支持下对那曲历史雪灾及其危险程度进行判别与归类，结果与实情基本吻合，说明此判别因子体系及分级标准是可行的。更多还原

【Abstract】 The assessing parameter system to decide whether a snowfall can become disaster is set up in this paper by analyzing various factors connected with snow disaster. The classification criteria of assessing parameters are determined by statistical analysis of past accumulation snow and climate data in more than ten years in Naqu,Xizang. These assessing parameters and classification criteria are used to assess and classify the past snow disasters and their degrees of dangerousness in the support of the assessing model. The results are generally identical with the reality,indicating the assessing parameter system and classification criteria are feasible.更多还原