On the Sensitivity of Standardized-Precipitation-Evapotranspiration and Aridity Indexes Using Alternative Potential Evapotranspiration Models
نویسندگان
چکیده
This paper examines the impacts of three different potential evapotranspiration (PET) models on drought severity and frequencies indicated by standardized precipitation index (SPEI). The precipitation-evapotranspiration is a recent approach to operational monitoring analysis severity. combines temperature data, quantifying as difference in timestep between PET. thus represents hydrological processes that drive events more realistically than at expense additional computational complexity increased data demands. principally due need estimate PET within each time step. was originally defined using Thornthwaite model. However, numerous researchers have demonstrated sensitive model adopted. requiring sparse meteorological inputs, such model, particular utility for scarce environments. aridity (AI) investigates spatiotemporal changes hydroclimatic system. It ratio precipitation. used characterize wet (humid) dry (arid) regions. In this study, sensitivity indexes carried out models; namely, Penman–Monteith temperature-based parametric undertaken six gauge stations California region where long-term occurred. Having estimating index, our findings highlight presence uncertainty defining drought, especially large timescales (12 months 48 months), preferable both indexes. latter outcome worth further consideration when climatic studies are under development areas full required variables assessment not available.
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ژورنال
عنوان ژورنال: Hydrology
سال: 2023
ISSN: ['2330-7609', '2330-7617']
DOI: https://doi.org/10.3390/hydrology10030064