[1]MA Qin,ZHANG Xiao-ping,WAN Long,et al.Fitting of the PMP Values and Identifying Its Spatiotemporal Characteristics in the Helong Section on the Loess Plateau[J].Research of Soil and Water Conservation,2012,19(02):71-76.
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Fitting of the PMP Values and Identifying Its Spatiotemporal Characteristics in the Helong Section on the Loess Plateau
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
19
Number of periods:
2012 02
Page number:
71-76
Column:
Public date:
2012-04-20
- Title:
- Fitting of the PMP Values and Identifying Its Spatiotemporal Characteristics in the Helong Section on the Loess Plateau
- Keywords:
- PMP; GEV distribution; Gumbel distribution; Helong Section; Loess Plateau
- CLC:
- P468.0+24
- DOI:
- -
- Abstract:
- There is high frequency of the heavy precipitation events in the Helong Section on the Loess Plateau.And the heavy precipitation events can cause severe soil erosion.The paper deals with the estimation of the return period of precipitation extremes in the Helong Section on the Loess Plateau.In this study,the daily precipitation datasets at 24 meterological stations from 1957—2009 were used to estimate the probable maximum precipitation (PMP) in the Helong Section.Two extreme distribution models of probability estimations were compared to identify the applicability:the GEV distribution and the Gumbel distribution.The spatiotemporal characteristics for the extreme events were detected.The results showed that:(1) for the return period less than 10 years,there was little difference between the two distributions for estimation of the PMP.But for the return period greater than 20a,the GEV distribution was properly more than the Gumbel distribution to estimate the PMP in the Helong Section.When there were several heavy precipitation events with the similar precipitation values,the Gumbel distribution is properly more than the GEV distribution;(2) the PMP values in the Helong Section for the return period of 2a,5a,10a,20a,50a,100a were between 40~70,50~85,60~100,70~110,85~130,95~150mm,respectively.The PMP value for a given return period was higher in the Yanhe River in the south and in the Ordos Desert in the northwestern Helong Section.However,it was lower in the northeastern part.The PMP values estimated by the daily precipitation data of the three period of 1950s—1960s,1970s—1980s,1990s—2000s were varied.The PMP values estimated by the datasets of 1950s—1960s in the Taiyuan and Yulin stations were higher.However,at the Dongsheng,Xingxian and Yanan stations,the estimated PMP values were higher for the datasets of 1970s—1980s.
- References:
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