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DOI	10.1016/j.scitotenv.2021.152464
	Using soil-moisture drought indices to evaluate key indicators of agricultural drought in semi-arid Mediterranean Southern Africa
	Watson, Andrew; Miller, Jodie; Kunne, Annika; Kralisch, Sven
通讯作者	Watson, A (corresponding author)，Stellenbosch Univ, Water Inst, Private Bag X1, ZA-7602 Matieland, South Africa.
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2022
卷号	812
英文摘要	Droughts are natural disasters that globally affect large numbers of people each year. While different forms of drought exist, their severity and extent are dependent on critical points of onset. Understanding these onsets is crucial for water, food and energy security, as well as to develop climate change adaptation strategies. This study used the JAMS/J2000 hydrological model to detect agricultural drought using the Soil Moisture Deficit Index (SMDI). The Berg River catchment in Mediterranean South Africa was used as the pilot study area, which experienced a severe drought between 2015 and 2018 and where meteorological drought progressed into agricultural drought that resulted in significant crop reductions and job losses within the agricultural sector. To combat the effects of meteorological shortfalls, water resource management opted to curb agricultural reservoir releases, forcing farmers to rely on groundwater. Modelling results illustrated the importance of detecting headwater stress within the catchment, where in 2015/2017 headwater areas were affected for the first time over the 35-year simulation. Furthermore, regional changes to the groundwater system, during which severe to extremely severe SMDI values (-3 to -4) were simulated, is postulated to be caused by wide-spread groundwater overuse resulting in a 47% reduction in winter (JJA) anda 68% reduction in spring (SON) streamflow. Immediate streamflow reductions were observed, illustrating the low resilience of these systems to meteorological and agricultural droughts, as well as the impacts of water use behavioural changes. By using SMDI in conjunction with a well constrained hydrological model, crucial drought onset triggers can be detected as well as tipping points regarding water use behaviour. As climate change drives an increase in the occurrence of meteorological droughts in many parts of the world, understanding the advance of severe long-term effects is important for the development of effective adaption strategies to promote water, food and energy security.
英文关键词	Drought Hydrological change Rainfall/runoff modelling Soil Moisture Deficit Index
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000744505200012
WOS关键词	CLIMATE-CHANGE ; WEST-COAST ; MODEL ; MIGRATION ; IMPACT
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376872
作者单位	[Watson, Andrew] Stellenbosch Univ, Water Inst, Private Bag X1, ZA-7602 Matieland, South Africa; [Miller, Jodie] Stellenbosch Univ, Dept Earth Sci, Private Bag X1, ZA-7602 Matieland, South Africa; [Kunne, Annika; Kralisch, Sven] Friedrich Schiller Univ Jena, Inst Geog, Loebdergraben 32, D-07743 Jena, Germany
推荐引用方式 GB/T 7714	Watson, Andrew,Miller, Jodie,Kunne, Annika,et al. Using soil-moisture drought indices to evaluate key indicators of agricultural drought in semi-arid Mediterranean Southern Africa[J],2022,812.
APA	Watson, Andrew,Miller, Jodie,Kunne, Annika,&Kralisch, Sven.(2022).Using soil-moisture drought indices to evaluate key indicators of agricultural drought in semi-arid Mediterranean Southern Africa.SCIENCE OF THE TOTAL ENVIRONMENT,812.
MLA	Watson, Andrew,et al."Using soil-moisture drought indices to evaluate key indicators of agricultural drought in semi-arid Mediterranean Southern Africa".SCIENCE OF THE TOTAL ENVIRONMENT 812(2022).