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首页> 外文期刊>American Journal of Environmental Sciences >Rainfall Depth-Duration-Frequency Relationships for South Carolina, North Carolina, and Georgia | Science Publications
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Rainfall Depth-Duration-Frequency Relationships for South Carolina, North Carolina, and Georgia | Science Publications

机译：南卡罗来纳州，北卡罗来纳州和格鲁吉亚的降雨深度频率关系科学出版物

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> The depth-duration-frequency curves and isopluvial maps for the region encompassing South Carolina, North Carolina, and Georgia were developed using the available rainfall data. The aim was to update the existing intensity-duration-frequency curves in the region and obtain these curves at ungauged sites throughout the region using the newly developed rainfall frequency analysis techniques. A total of 17 durations ranging from 15 minutes to 120 hours for return periods of 2, 10, 25, 50, and 100 years were analyzed. The L-moment method with X-10 test was used to search for homogeneous regions within the study area. It was found that the method was either unable to homogeneous regions that were geographically contiguous or too many stations had to be eliminated before a region could be considered homogenous. Finally, at-site statistics were calculated to develop frequency relationships. Normal, lognormal, generalized extreme value, Pearson type III, and log Pearson type III probability distribution functions were used to fit the maximum annual precipitation data at each gauging site for each duration. The chi-squared goodness-of-fit test was used to determine the best fit probability distribution. The new intensity-duration-frequency curves were found to be lower than the existing curves developed in 1986. The difference between the two set of curves was found to be due to the removal of the outliers in the present study and the existence of the post 1986 drought conditions in the region. The spatial interpolation of the rainfall intensity from the depth-duration-frequency curves was found to yield accurate intensity-duration-frequency curves and could be used to develop these curves at ungauged sites in the study area.
机译：>使用可用的降雨数据开发了包含南卡罗来纳州，北卡罗来纳州，北卡罗来纳州和格鲁吉亚的地区的深度频率曲线和等值图。目的是更新该区域中的现有强度持续时间曲线，并使用新开发的降雨频率分析技术在整个地区的未凝固站点获得这些曲线。分析了总共17个持续时间，返回2,10,25,50和100年的返回期间为15分钟到120小时。使用X-10测试的L-矩测试用于在研究区域内搜索均匀区域。结果发现，该方法不能在区域均匀地均匀地被消除地理上邻接或太多站的均匀区域。最后，计算出现场统计数据以开发频率关系。正常，伐木，广义极值，Pearson IID和Log Pearson型III概率分布函数用于适用于每个持续时间的每个测量部位的最大年降水数据。 Chi平方英的拟合性测试用于确定最合适的概率分布。发现新的强度频率曲线低于1986年开发的现有曲线。发现两组曲线之间的差异是由于目前研究中的异常值和柱子的存在1986年的干旱条件。发现来自深度频率曲线的降雨强度的空间插值，从而产生精确的强度持续时间曲线，并且可用于在研究区域中的未凝固位点开发这些曲线。

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