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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-21 20:36 |
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Conference: Bucharest University Faculty of Physics 2008 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Drought monitoring using the Standardized Precipitation Index, the Palmer Drought Severity Index and the Palmer Hydrological Drought Index (POSTER)
Authors:
Monica Ghioca
Affiliation:
Schlumberger
E-mail
mghioca@yahoo.com
Keywords:
SPI, PDSI, PHDI
Abstract:
The Standardized Precipitation Index (SPI) is an index based on the probability of precipitation for a number of consecutive months. An SPI in one region can be directly compared to an SPI in a completely different climate zone. Another advantage is that the SPI can be computed for various time scales (e.g., 1, 3, 6, 36, 72 months, etc.). The nature of the SPI allows to determine the rarity of a drought or an anomalously wet event at a particular time scale for any location in the world that has a precipitation record. The Palmer Drought Severity Index (PDSI) attempts to measure the duration and intensity of the long-term drought-inducing circulation patterns. Long-term drought is cumulative, so the intensity of drought during the current month is dependent on the current weather patterns plus the cumulative patterns of previous months. Since weather patterns can change almost literally overnight from a long-term drought pattern to a long-term wet pattern, the PDSI can respond fairly rapidly.
The hydrological impacts of drought (e.g. discharges, reservoir levels, groundwater levels, etc.) take longer to develop and it takes longer to recover from them. The Palmer Hydrological Drought Index (PHDI), another long-term drought index, was developed to quantify these hydrological effects. The PHDI responds more slowly to changing conditions than the PDSI. These indices have been used for the purpose of defining and monitoring drought over the Jiu basin, showing the temporal and spatial variability of the drought.
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