河西走廊位于中国西北干旱、半干旱区，受到周边沙漠和戈壁的影响，风沙灾害问题比较严重。依据灾害系统理论，从致灾因子危险性、孕灾环境脆弱性和承灾体易损性3个方面构建区域灾害风险评估体系和评估模型，对河西走廊风沙灾害风险进行评估。结果表明：（1）高风险地区主要分布在河西走廊内部的沙漠区，如酒泉市、玉门市、金塔县、高台县、临泽县以及武威市的北部地区，约占总面积的10.8%；（2）较高风险的地区主要分布在敦煌市、阿克塞哈萨克族自治县和河西走廊的北部，约占总面积的56.5%；（3）低风险地区位于河西走廊的东南部，该区在祁连山的天然屏障下，植被盖度高，雨水丰富；（4）作为风沙灾害的主体和对象，河西走廊的社会经济因素对风沙灾害风险的贡献率较低。而作为风沙灾害的物质基础和动力条件，沙源和风速仍是河西走廊风沙灾害风险的主要诱因；（5）经济发达城市在风沙灾害中具有更高的易损性，应该对城市邻近沙源进行重点防治。
Hexi corridor is located in the arid and semi-arid regions of China. Due to the influence of the surrounding desert and gobi, the area is affected by various forms of sandstorms. Based on the theory of disaster system, this paper constructs the regional wind-blown sand disaster risk assessment system and assessment model from the aspects of the danger of the hazard risk factors, the vulnerability of the hazard pregnant environment and the vulnerability of the hazard-bearing body, and evaluates the risk of wind-blown sand disaster in the Hexi corridor. The results show that:(1) The extremely high risk areas are the desert areas in the Hexi Corridor, accounting for about 10.8% of the total area, such as Dunhuang City, Yumen City, Jinta County, Gaotai County, Linze Conty and the north of Wuwei City. The high risk areas are mainly distributed in Dunhuang City, Aksai Kazak Autonomous County and north of the Hexi Corridor, about 56.5% of the total area. The low risk areas are located in the southeastern part of the Hexi Corridor, where the vegetation cover is high and the precipitation is abundant under the natural barrier of the Qilian Mountains. (2) As the main body and object of the wind-blown sand disaster, the social and cultural factors of the Hexi Corridor contribute less to the result of assessment, as the material basis and dynamic conditions of wind-blown sand disaster, blown sand and wind are still the main causes of wind-blown sand disaster in Hexi corridor. (3) There is a higher vulnerability of wind-blown sand disaster for economically developed cities. We should pay more attention to the sand source near by the cities.
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