DOI: 10.1016/j.crm.2017.04.004
Scopus记录号: 2-s2.0-85018372135
论文题名: Precipitation intensity-duration-frequency curves and their uncertainties for Ghaap plateau
作者: Tfwala C.M. ; van Rensburg L.D. ; Schall R. ; Mosia S.M. ; Dlamini P.
刊名: Climate Risk Management
ISSN: 22120963
出版年: 2017
卷: 16 起始页码: 1
结束页码: 9
语种: 英语
英文关键词: Generalized extreme value distribution function
; Ghaap plateau
; Precipitation intensity-duration-frequency curves
; Uncertainty levels
英文摘要: Engineering infrastructures such as stormwater drains and bridges are commonly designed using the concept of Intensity-Duration-Frequency (IDF) curves, which assume that the occurrence of precipitation patterns and distributions are spatially similar within the drainage area and remain unchanged throughout the lifespan of the infrastructures (stationary). Based on the premise that climate change will alter the spatial and temporal variability of precipitation patterns, inaccuracy in the estimation of IDF curves may occur. As such, prior to developing IDF curves, it is crucial to analyse trends of annual precipitation maxima. The objective of this study was to estimate the precipitation intensities and their uncertainties (lower and upper limits) for durations of 0.125, 0.25, 0.5, 1, 2, 4, and 6 h and return periods of 2, 10, 25, 50 and 100 years in the Ghaap plateau, Northern Cape Province, South Africa using the Generalized Extreme Value (GEV) distribution. The annual precipitation maxima were extracted from long-term (1918–2014) precipitation data for four meteorological stations (Postmasburg, Douglas, Kuruman and Groblershoop) sourced from the South African Weather Services (SAWS). On average, the estimated extreme precipitation intensities for the plateau ranged from 4.2 mm/h for 6 h storm duration to 55.8 mm/h for 0.125 h at 2 years return period. At 100 year return period, the intensity ranged from 13.3 mm/h for 6 h duration to 175.5 mm/h for the duration of 0.125 h. The lower limit of uncertainty ranged from 11.7% at 2 years return period to 26% at 100 year return period, and from 12.8% to 58.4% for the upper limit for the respective return periods. This methodology can be integrated into policy formulation for the design of stormwater and flood management infrastructures in the Ghaap plateau, where mining is the main economic activity. © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/58965
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: University of the Free State, PO Box 339, Department of Soil, Crop and Climate Sciences (54), Bloemfontein, South Africa; University of the Free State, PO Box 339, Department of Mathematical Statistics and Actuarial Science (75), Bloemfontein, South Africa; University of the Free State, PO Box 339, School of Mathematics Natural Science and Technology (62), Bloemfontein, South Africa
Recommended Citation:
Tfwala C.M.,van Rensburg L.D.,Schall R.,et al. Precipitation intensity-duration-frequency curves and their uncertainties for Ghaap plateau[J]. Climate Risk Management,2017-01-01,16