干旱区生态环境知识资源中心(Arid): Analysis of the Spatio-Temporal Variability of Precipitation and Drought Intensity in an Arid Catchment in South Africa

Arid

DOI	10.3390/cli8060070
	Analysis of the Spatio-Temporal Variability of Precipitation and Drought Intensity in an Arid Catchment in South Africa
	Mengistu, Achamyeleh G.; Tesfuhuney, Weldemichael A.; Woyessa, Yali E.; van Rensburg, Leon D.
通讯作者	Mengistu, AG
来源期刊	CLIMATE
EISSN	2225-1154
出版年	2020
卷号	8 期号:6
英文摘要	Water deficit is high and precipitation varies spatio-temporally in arid areas. This study was conducted to analyse the spatio-temporal variability of precipitation and drought intensity in an arid catchment in South Africa. The Soil and Water Assessment Tool (SWAT) was used to estimate the spatio-temporal precipitation where nine meteorological stations were used as input to the model. The model was calibrated and validated by regionalization with a physical similarity approach. SWAT only predicts precipitation at sub-basin level. Hence, the mean precipitation was further interpolated by using the inverse distance weighted method (IDW). The Mann-Kendall trend test shows that there was no trend in annual precipitation whereas in the monthly precipitation there was a 0.01 mm decrease. Daily precipitation varied from 0.1 to 4 mm whereas in a monthly basis, it varied from 6 mm (September) to 43.4 mm (February). The annual precipitation varied from 169 mm (1983) to 415 mm (2003) with a long-term mean of 280.8 mm. Precipitation is also highly variable in space throughout the catchment. Generally, annual precipitation decreased from north to south; however, during the winter season, the reverse was true due to the influence of rain-bearing condition from the south-western direction. Based on the aridity index (AI), the catchment is categorized as arid. The SPI shows that the 1983 drought was the worst whereas the 2003 and 2004 years were relatively wet. The results from this study provide baseline information for further research in climate change adaptation and environmental monitoring programs in the region.
英文关键词	arid catchments drought intensity precipitation deficit South Africa spatio-temporal variation trend analysis
类型	Article
语种	英语
开放获取类型	DOAJ Gold
收录类别	ESCI
WOS记录号	WOS:000551179500009
WOS关键词	RAINFALL VARIABILITY ; CLIMATE-CHANGE ; WATER-BALANCE ; TRENDS ; MODEL ; TOPOGRAPHY ; REGION ; SERIES ; WET ; DRY
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/334491
作者单位	[Mengistu, Achamyeleh G.; Tesfuhuney, Weldemichael A.] Univ Free State, Dept Soil Crop & Climate Sci, ZA-9300 Bloemfontein, South Africa; [Woyessa, Yali E.] Cent Univ Technol, Dept Civil Engn, ZA-9300 Bloemfontein, South Africa; [van Rensburg, Leon D.] Vans Lab Soil Plant & Water Anal, ZA-9338 Bloemfontein, South Africa
推荐引用方式 GB/T 7714	Mengistu, Achamyeleh G.,Tesfuhuney, Weldemichael A.,Woyessa, Yali E.,et al. Analysis of the Spatio-Temporal Variability of Precipitation and Drought Intensity in an Arid Catchment in South Africa[J],2020,8(6).
APA	Mengistu, Achamyeleh G.,Tesfuhuney, Weldemichael A.,Woyessa, Yali E.,&van Rensburg, Leon D..(2020).Analysis of the Spatio-Temporal Variability of Precipitation and Drought Intensity in an Arid Catchment in South Africa.CLIMATE,8(6).
MLA	Mengistu, Achamyeleh G.,et al."Analysis of the Spatio-Temporal Variability of Precipitation and Drought Intensity in an Arid Catchment in South Africa".CLIMATE 8.6(2020).