Quantitatively defining megadrought based on drought events in central Chile
Megadroughts represent droughts with a high-intensity, long-lasting duration, and extensive spatial extent. However, as these characteristics have not been quantitatively proposed, a reasonable guideline for identifying megadroughts has not been determined. This study aims to identify the quantitati...
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| Veröffentlicht in: | Geomatics, natural hazards and risk natural hazards and risk, 2022-12, Vol.13 (1), p.975-992 |
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| creator | Kim, Youngkyu Kim, Sunmin Jeong, Hoseong An, Hyunuk |
| description | Megadroughts represent droughts with a high-intensity, long-lasting duration, and extensive spatial extent. However, as these characteristics have not been quantitatively proposed, a reasonable guideline for identifying megadroughts has not been determined. This study aims to identify the quantitative characteristics of a megadrought and suggest a guideline for detecting the occurrence of the megadrought. This study focused on the central Chile megadrought that occurred from 2010 to 2016 in central Chile. The megadrought was analyzed using the standardized precipitation index (SPI) while increasing its timescale. The 60-month timescale spatially represented that more than 60% of all stations in central Chile experienced a drought indicating moderate or more drought intensity (SPI ≤ −1) for a long duration of more than 36 months in the megadrought period. Then, guidelines were suggested based on the timescale, drought intensity, and spatial extent of drought as the criteria to detect the occurrence of the megadrought. In the criteria of moderate or more drought intensity and the spatial extent of 50% or 60%, the 60-month timescale detected the occurrence of the megadrought the earliest and most appropriately. This study will be used as a useful guideline to define and detect megadroughts that will occur in the future. |
| doi_str_mv | 10.1080/19475705.2022.2060763 |
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However, as these characteristics have not been quantitatively proposed, a reasonable guideline for identifying megadroughts has not been determined. This study aims to identify the quantitative characteristics of a megadrought and suggest a guideline for detecting the occurrence of the megadrought. This study focused on the central Chile megadrought that occurred from 2010 to 2016 in central Chile. The megadrought was analyzed using the standardized precipitation index (SPI) while increasing its timescale. The 60-month timescale spatially represented that more than 60% of all stations in central Chile experienced a drought indicating moderate or more drought intensity (SPI ≤ −1) for a long duration of more than 36 months in the megadrought period. Then, guidelines were suggested based on the timescale, drought intensity, and spatial extent of drought as the criteria to detect the occurrence of the megadrought. In the criteria of moderate or more drought intensity and the spatial extent of 50% or 60%, the 60-month timescale detected the occurrence of the megadrought the earliest and most appropriately. This study will be used as a useful guideline to define and detect megadroughts that will occur in the future.</description><identifier>ISSN: 1947-5705</identifier><identifier>EISSN: 1947-5713</identifier><identifier>DOI: 10.1080/19475705.2022.2060763</identifier><language>eng</language><publisher>Abingdon: Taylor & Francis</publisher><subject>Central Chile ; Criteria ; Drought ; guideline ; megadrought ; SPI ; Standardized precipitation index ; Time</subject><ispartof>Geomatics, natural hazards and risk, 2022-12, Vol.13 (1), p.975-992</ispartof><rights>2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. 2022</rights><rights>2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. 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| subjects | Central Chile Criteria Drought guideline megadrought SPI Standardized precipitation index Time |
| title | Quantitatively defining megadrought based on drought events in central Chile |
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