Development of a new agro-meteorological drought index (SPAEI-Agro) in a data-scarce region

Drought complexity may not be accurately characterized by univariate meteorological or hydrological drought indices under the intensification of hydrological cycle due to climate change and human activities. In particular, such drought indices require long series of hydro-meteorological data, which...

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Bibliographic Details
Published in:Hydrological sciences journal 2023-07, Vol.68 (9), p.1301-1322
Main Authors: Kumari, Pallavi, Rehana, Shaik, Singh, Shailesh Kumar, Inayathulla, M.
Format: Article
Language:English
Subjects:
agro-meteorological drought
Catchment area
Catchment scale
Catchments
Climate and human activity
Climate change
Climatology
Drought
Drought characteristics
Drought index
Evapotranspiration
Evapotranspiration-precipitation relationships
Groundwater
Groundwater runoff
Humid climates
Hydrologic cycle
Hydrologic drought
Hydrological cycle
Hydrology
Hydrometeorology
Meteorological data
Potential evapotranspiration
Precipitation
Runoff
SPEI
SSDI
Stream discharge
Stream flow
Subhumid climates
SWAT
Tunga-Bhadra
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Summary:Drought complexity may not be accurately characterized by univariate meteorological or hydrological drought indices under the intensification of hydrological cycle due to climate change and human activities. In particular, such drought indices require long series of hydro-meteorological data, which are unavailable over ungauged and data-scarce catchments. In this study, a multivariate drought index, Standardized Precipitation Actual Evapotranspiration Index-Agro (SPAEI-Agro), is proposed, which combines meteorological and hydrological variables as precipitation (P), actual evapotranspiration (AET), runoff and groundwater (GW) of ungauged catchments and sub-catchment scales with diverse climatology. SPAEI-Agro was able to characterize severe drought events more accurately in humid and dry sub-humid sub-catchments compared to Standardized Precipitation Evapotranspiration Index (SPEI) and Standardized Streamflow Drought Index (SSDI) for Tunga-Bhadra River, India. SPEI (based upon potential evapotranspiration) and SSDI (based on streamflow) showed intensified drought characteristics compared to the new P, AET and GW-based drought indicator SPAEI-Agro in semi-arid and dry sub-humid climates.
ISSN:0262-6667
2150-3435
DOI:10.1080/02626667.2023.2206969