宝鸡地区近1400a洪涝灾害及其影响

Flood disaster and its social impacts in Baoji area during the past 1400 years

根据地方史料记载,统计出宝鸡地区公元600年至2000年洪涝灾害的发生规律。结果表明：宝鸡地区洪涝灾害可划分为轻度涝灾、中度涝灾、大涝灾、特大涝灾4级灾害,以中度和大涝灾为主,占灾害记录总数的71.55%,特大洪涝灾害较少发生,占灾害记录总数的8.94%。公元600-2000年1400a的时段可以分为14个洪涝灾害发生阶段：10、11、12、13、14、15世纪为无洪涝灾害或极少洪涝灾害发生阶段,7、8、9、16、17、18、19、20世纪为洪涝灾害多发阶段。洪灾集中于夏、秋两季。宝鸡地区洪涝灾害的发生主要是由地理位置、气候异常波动以及人为活动综合因素影响的结果。

The frequencies of flood disasters and their impacts in Baoji during 600 - 2000 were analyzed according to the statistics of local historical disaster data and relating information. The results show that in Baoji area the flood disaster level might be divided into small,middle,great and the greatest. Flood disasters with middle and great danger were at the main station,and their took 71. 55% of total. The flood disasters with the greatest danger occurred scarcely,and their took 8. 94% of total. The period could be divided into six phases,in 10, 11,12,13,14 and 15 century there were no or scarcely flood disasters,and in 7,8,9,16,17,18,19and 20 century there were plenty of flood disasters. Seasonally,the disaster occurrence frequency concentrated on summer and autumn. Main factors producing flood disaster are geography position,climatic anomaly undulation and the synthetically action of artificial flexible affection.