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张涛, 李亮亮, 李建. 2022: 云贵高原两个国家基准站降水特性比较. 暴雨灾害, 41(1): 50-57. DOI: 10.3969/j.issn.1004-9045.2022.01.006
引用本文: 张涛, 李亮亮, 李建. 2022: 云贵高原两个国家基准站降水特性比较. 暴雨灾害, 41(1): 50-57. DOI: 10.3969/j.issn.1004-9045.2022.01.006
ZHANG Tao, LI Liangliang, LI Jian. 2022: Comparison of rainfall characteristics of two national reference stations in Yunnan-Guizhou plateau. Torrential Rain and Disasters, 41(1): 50-57. DOI: 10.3969/j.issn.1004-9045.2022.01.006
Citation: ZHANG Tao, LI Liangliang, LI Jian. 2022: Comparison of rainfall characteristics of two national reference stations in Yunnan-Guizhou plateau. Torrential Rain and Disasters, 41(1): 50-57. DOI: 10.3969/j.issn.1004-9045.2022.01.006

云贵高原两个国家基准站降水特性比较

Comparison of rainfall characteristics of two national reference stations in Yunnan-Guizhou plateau

  • 摘要: 为更好地理解和认识小尺度地形对降水特性的影响,利用位于云贵高原地区相近的两个国家基准站太华山和昆明站2006—2018年雨季(5—10月)小时降水资料,统计分析了两站降水精细化的时空特征。结果表明,两站的海拔高度差约500 m、站距约5 km,暖季降水量差异不大,但降水的精细特征却存在明显差异,主要表现为:(1)两站的降水量和平均降水强度年际差异不明显,但太华山站多数年份的降水频次远多于昆明站;(2)降水日变化上,太华山站在11—20时的累积降水量要高于昆明站;两站降水频次均具有双峰型特征,但在03—09时和11—17时太华山站的降水频次要明显高于昆明站,00—13时和21—23时昆明站的平均降水强度高于太华山站。(3)两站的降水事件特征不同,太华山站的降水事件次数和累积降水量都明显多于昆明站,主要由持续时间在6 h以上的降水事件贡献。(4)两站降水事件主要为共有降水事件,降水特性差异也主要由共有降水事件造成。太华山站先开始(结束)降水的共有降水事件次数比昆明站多(少),持续时间(降水频次)比昆明站长(多),短、长时降水事件的降水量(降水频次)比昆明站大(多),平均降水持续时间比昆明站多0.36 h。(5)两站单独降水事件占总降水事件的39.9%,太华山站的单独降水事件数是昆明站的1.83倍,而且平均持续时间长于昆明站。

     

    Abstract: To better understand the influence of small-scale terrain on precipitation, the temporal-spatial variation features of precipitation were statistically analyzed using hourly precipitation data from two adjacent Taihuashan and Kunming national reference stations in Yunnan-Guizhou Plateau during the rainy season of 2006-2018. The altitude difference between the two stations is about 500 m and the station distance is about 5km. Results show that their rainy season precipitation amounts are similar, but the fine-scale characteristics of hourly precipitation are significantly different. The hourly precipitation differences between the two stations are as follows. (1) There are no obvious differences in the interannual variations of rainfall amount and rainfall intensity, but the rainfall frequency at Taihuashan station is higher than that at Kunming station in most years. (2) For diurnal variations, the cumulative precipitation amounts at Taihuashan station during 11:00-20:00 BT are larger than that at Kunming station. The precipitation frequency exhibits double diurnal peaks in both stations. The precipitation frequency at Taihuashan station is higher than that at Kunming station during 03:00-09:00 BT and 11:00-17:00 BT while the precipitation intensity at Taihuashan station is weaker than that at Kunming station during 00:00-13:00 BT and 21:00-23:00 BT. (3) The characteristics of precipitation events at the two stations are different. The number of precipitation events and cumulative precipitation at Taihuashan station are significantly higher than those at Kunming station, which is mainly contributed by the rainfall events longer than 6 hours. (4) For most rainfall events, rainfall can be observed at both two stations. Their rainfall differences are mainly caused by these coexistent events. These events more easily start at Taihuashan station while they more easily end at Kunming station. The duration and precipitation frequency contributed by these events at Taihuanshan station is also longer than that at Kunming station. The average precipitation duration of Taihuashan station is 0.36 h, which is longer than that of Kunming station. (5) The proportion of rainfall events that are only observed at one station is 39.9%. The number of rainfall events only occurring at Taihuashan station is 1.83 times than that at Kunming station. The duration of individual-rainfall-event at Taihuashan station is longer than that at Kunming station.

     

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