TY  - JOUR
TI  - Meteorological Drought Analysis for Helmand River
Basin, Afghanistan
AB  - This study evaluates drought at Lashkargah, Farah, Adraskan, and Gardandiwal stations in
Helmand River Basin (HRB) in Afghanistan to determine appropriate drought indices for the
basin. Thirty seven years of monthly recorded precipitation data from 1979 to 2015 are
employed with different drought index (DI) methods which include the Standardized
Precipitation Index (Normal-SPI, Log-SPI, and Gamma-SPI), the Percent of Normal (PN),
and the Deciles. All the methods are applied to the annual long term precipitation data. The
log-SPI and the gamma-SPI predict extreme drought conditions, whereas, the normal-SPI
determines wet and less dry conditions. The results emphasize that the PN and the Deciles
methods predict more drought years in comparison to the SPI methods. The Deciles method
shows longer period of extreme and severe drought than other methods. The five methods
indicate various drought intensities in 1985, 1987, 1994, 1997, 1999, 2000, 2001, 2002, 2003,
and 2004 at all the stations. The extreme drought condition in 2001 at all the stations confirms
to the recorded drought reports for the same region. It is noted that since the log-SPI and the
gamma-SPI capture the historical extreme and severe drought periods successfully, these are
recommended as the drought monitoring indices for Helmand River Basin.
AU  - TAYFUR, GOKMEN
AU  - Alami, Mohammad Musa
DO  - 10.18400/tekderg.868595
PY  - 2022
JO  - Teknik Dergi
VL  - 33
IS  - 4
SN  - 1300-3453
SP  - 12223
EP  - 12242
DB  - TRDizin
UR  - http://search/yayin/detay/536247
ER  -