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冰川冻土  2013 

新疆冰川、积雪对气候变化的响应(Ⅱ):灾害效应

DOI: 10.7522/j.issn.1000-0240.2013.0151, PP. 1355-1370

Keywords: 冰雪灾害,冰雪洪水,气候变化,适应性对策,新疆

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Abstract:

新疆地区冰川、积雪广泛分布,在其融水补给河川径流的同时,也常伴有冰川洪水、融雪洪水、冰湖突发洪水、冰川泥石流、冰雪崩和风吹雪等冰雪灾害发生,这些灾害对当地居民居住地以及重要国防干线的安全运营形成较大威胁.冰川、积雪变化直接影响到冰雪灾害发生的程度与影响范围,新疆的冰川洪水和冰湖突发洪水灾害主要发生在塔里木河流域的喀喇昆仑山、昆仑山以及天山南坡西部一带,融雪洪水灾害主要发生在新疆北部的阿勒泰地区、塔城地区和天山北坡一带,冰川泥石流、冰雪崩灾害主要发生在帕米尔高原、天山西段和西昆仑山地区,风吹雪主要在天山中、西段地区.随着全球气候变暖,尤其是新疆从1987年开始的气候由暖干向暖湿的转型,冰川退缩加剧,融水量增大,冰川洪水和冰川泥石流灾害随着冰川融水径流的增加而增多;而融雪洪水、雪崩和风吹雪随着气候变化引起的冬季积雪增加和气温升高,其灾害强度在增强;冰崩灾害随着气温升高引起的高山冰体崩解而呈增加趋势.在新疆地区,冰雪灾害主要表现为冰雪洪水,已观测到近十几年来在气候变化影响下冰雪洪水发生的频次和强度有增加的趋势,塔里木河流域的冰湖溃决洪水和冰川洪水及北疆春季的冰凌和融雪洪水已对当地的生命财产和社会经济发展带来巨大危害,新疆的水资源安全、灾害等问题日益凸显.预计未来,随着气候增温引起的冰雪融水径流的增加,相关的冰雪灾害增多,因而增加了冰雪灾害的危险程度,并可能形成若干新的灾害点.面对气候变化诱发的众多冰川、积雪灾害,目前还缺乏对灾害监测、预测预警方面的适应对策.因此,在全球气候变化不断加速的趋势下,冰雪灾害应引起有关方面的足够重视,加强气候变化对冰雪灾害的影响评估和适应性管理对策研究,使科学技术在减灾方面发挥主导作用.

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