Changes in heavy rainfall in midwestern United States
Changes in heavy rainfall in midwestern United States
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DOI：
10.1061/(asce)0733-9496(1997)123:4(246
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发表时间：
1997-07-01
期刊：
影响因子：
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通讯作者：
Huff, FA
中科院分区：
文献类型：
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作者：
Angel, JR;Huff, FA
暴雨事件的特征在输水建筑物的设计、农业、人工影响天气和监测气候变化方面具有重要意义。传统上，人们假定极端降雨量时间序列是平稳的，没有趋势。对于美国中西部的部分地区来说，这一假设可能不成立。追溯到1901年的304个站点的最新数字化降水记录被用来检验这一假设。整个中西部地区的结果显示，气象站更有可能经历近年来最强的降雨事件。对年最大值时间序列变化的地理分布的分析表明，在整个中西部地区，年最大值时间序列的变化可能对确定降雨频率值和随后的径流计算产生重大影响。这些结果表明，降雨频率研究应定期更新，以最大限度地发挥作用。
Characteristics of heavy rainfall events are important in the design of water-handling structures, agriculture, weather modification, and in monitoring climate change. Traditionally it is assumed that the extreme rainfall time series are stationary with no trends. This assumption may not be true for portions of the Midwestern United States. A newly digitized record of precipitation for 304 sites that extends back to 1901 was used to examine this assumption. Results for the entire Midwest show that stations are more likely to experience their heaviest rainfall events in more recent years. An analysis of the geographic distribution of changes in the annual maximum time series shows areas of increases across the Midwest, The impact of the changes in the annual maximum time series can be significant in determining rainfall frequency values and consequent runoff calculations. These results suggest that rainfall frequency studies should be updated on a regular basis for maximum usefulness.