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中文摘要：
根据地方史料记载,统计出清代汉江上游陕南段洪涝灾害的发生规律。结果表明：清代洪涝灾害总体上表现出增加的趋势,公元1814年以前平均3.09年发生1次;公元1814年以后明显增多,且出现了两次洪涝灾害的高发期。其中1814～1853年间发生34次,平均1.18年1次;1884～1893年间发生了9次,平均1.11年1次。受到东南季风、西南季风和西北季风大气环流形势演变的影响,夏秋两季是汉江上游洪涝发生频率较高的时期,其中又以初夏和秋季为主。这些洪涝灾害的发生与气候变化及移民垦殖对于流域植被的破坏有密切关系。
英文摘要：
The frequencies of flood disasters and their impacts in Qing Dynasty in northern Shannxi were analyzed according to the statistics of local historical disaster data collection and relating information.It showed that the frequency of flood disaster was lower in 1644 - 1804,1 time per 3.09 year;it was higher in 1814 - 1854 and 1814-1853,1 time per 1.18 year and 1 time per 1.11 year.Flood disaster occured mainly in summer and autumn;Grade two and grade three disaster were relatively more.There had a significant relationship between the flood disaster occurrence and the local climate changes,topography and the reclamation activity of migration.Flood disaster had affected the economic and social development,agriculture and natural enviroment.
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