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雷向杰, 李芳, 赵晓萌. 2016: 延安市2013年7月极端连续降水致灾评估分析. 暴雨灾害, 35(6): 521-528. DOI: 10.3969/j.issn.1004-9045.2016.06.004
引用本文: 雷向杰, 李芳, 赵晓萌. 2016: 延安市2013年7月极端连续降水致灾评估分析. 暴雨灾害, 35(6): 521-528. DOI: 10.3969/j.issn.1004-9045.2016.06.004
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LEI Xiangjie, LI Fang, ZHAO Xiaomeng. 2016: Evaluation and analysis of extreme continuous precipitation induced disasters of Yan' an city in 2013 July. Torrential Rain and Disasters, 35(6): 521-528. DOI: 10.3969/j.issn.1004-9045.2016.06.004
Citation: LEI Xiangjie, LI Fang, ZHAO Xiaomeng. 2016: Evaluation and analysis of extreme continuous precipitation induced disasters of Yan' an city in 2013 July. Torrential Rain and Disasters, 35(6): 521-528. DOI: 10.3969/j.issn.1004-9045.2016.06.004
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延安市2013年7月极端连续降水致灾评估分析

Evaluation and analysis of extreme continuous precipitation induced disasters of Yan' an city in 2013 July

    摘要
  • 摘要: 利用陕西省延安市12个气象站建站至2013年7月的降水资料和延安市降水引发的地质灾害资料，从1 h、3 h、6 h、12 h、日最大降水量、3 d连续最大降水量和月降水量等方面分析了延安市2013年7月连续降水的极端性和致灾特点。结果表明：延安市2013年7月全市平均降水量419 mm，为1 000 a一遇极端降水。过程累积地质灾害次数(DL)和过程累计降水量(RL)关系密切，两者关系可以用分段函数描述。延安市RL＜137 mm时，无群发地质灾害；137mm≤RL＜200 mm且日降水量(RR)＜50 mm时，有群发地质灾害但较少；RL≥200 mm或200 mm＞RL≥137 mm且RR≥50 mm时，群发地质灾害多。经济比较发达、防灾减灾能力较强的延安市宝塔区2013年7月降水量568 mm，超过1 000 a一遇，其RL＜332 mm时，无群发地质灾害；RL≥332 mm时，群发地质灾害多。

     

    Abstract: By using the precipitation data and geographic disasters data, in this study we analyzed the characteristics of extreme and disastrous precipitation in Yan' an City during July 2013 from several angles including maximum precipitation during 1 h, 3 h, 6 h, 12 h and daily maximum precipitation, 3-day continuous maximum precipitation and monthly precipitation and so on. In the study we also analyzed the relationship between process accumulated precipitation (RL) and process accumulated geological disaster frequency (DL), daily precipitation (RR) and daily geological disaster frequency (DR). The results show that: (1) The monthly mean precipitation in Yan'an city during July 2013 is 419 mm, which is a thousand year frequency extreme precipitation. (2) RL is closely related to DL, and the relationship between the two can be described by piecewise function. (3) There are no group geological disasters in Yan' an city when RL < 137 mm, seldom when 200 mm > RL≥137 mm and RR < 50 mm, and frequent when RL≥200 mm or 200 mm > RL≥137 mm and RR≥50 mm. (4) The precipitation of Baota district in July 2013 is 568 mm, exceeding a 1 000-year frequency. There are no group geological disasters when RL < 332 mm, and frequent group geological disasters when RL≥332 mm.

     

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