Efficiency of some meteorological drought indices in different time scales, case study: wadi Louza basin (NW-Algeria)

• Autorzy: Djellouli F. , Bouanani A. , Baba-Hamed K.

Identyfikatory

DOI

10.1515/jwld-2016-0034

Warianty tytułu

PL

Efektywność niektórych wskaźników suszy meteorologicznej w różnej skali czasu na przykładzie zlewni uedu Louza w północno-zachodniej Algierii

• Języki publikacji: EN

Abstrakty

EN

Drought is an insidious hazard of nature in many parts of the world. It originates from persistent shortage of precipitation over a specific region for a specific period of time and has a conceptual and operational definition. Drought impact on some activity, group, or environmental sector depends on the extent of water shortage and ground conditions. Algeria and especially the western region has experienced several periods of drought over the last century, since 1975 to the present day. The most recent drought in 1981, 1989, 1990, 1992, 1994 and 1999 was characterized by its intensity and spatial extent. Drought is identified using various drought indices (meteorological, hydrological and agricultural). In this research, we focus on the meteorological drought, to assess the reliability of these indices under changing climatic conditions. Data was recorded for the period of 1980–2009 at wadi Louza catchment (NW-Algeria). For describing and monitoring drought severity periods, we calculated the correlation between both meteorological drought indices: Standardised Precipitation Index (SPI) and Effective Drought Index (EDI). The results show that the watershed of wadi Louza has experienced a severe meteorological drought. The correlation between meteorological drought indices was good for all time steps and the best was found for 9-month time step. The obtained results may provide some scientific support for fighting against droughts.

PL

Susza jest naturalnym zagrożeniem w wielu częściach świata. Powstaje wskutek trwałego ograniczenia ilości opadów w danym regionie i okresie czasu. Jest zdefiniowana w sensie konceptualnym i operacyjnym. Wpływ suszy na różne rodzaje działalności człowieka i na środowisko zależy od rozmiaru deficytu wody i od warunków glebowych. Algieria, szczególnie jej zachodnia część doświadczyła okresów intensywnej suszy już w ubiegłym wieku, począwszy od roku 1975 r., i doświadcza ich po dzień dzisiejszy. Ostatnia susza charakteryzowała się dużą intensywnością i przestrzennym zasięgiem. Suszę identyfikuje się, używając różnych wskaźników meteorologicznych, hydrologicznych lub rolniczych. W badaniach prezentowanych w niniejszej pracy skupiono się na suszy meteorologicznej, aby ocenić wiarygodność tych wskaźników w zmieniających się warunkach klimatycznych. Dane notowano w okresie 1980–2009 w zlewni uedu Louza w północno-zachodniej Algierii. Na potrzeby charakterystyki i monitoringu okresów suszy obliczono korelację między dwoma wskaźnikami – wskaźnikiem standaryzowanego opadu (SPI) i efektywnym wskaźnikiem suszy (EDI). Wyniki dowodzą, że w zlewni uedu Louza wystąpiła głęboka susza meteorologiczna. Korelacja między wskaźnikami suszy meteorologicznej była dobra w odniesieniu do wszystkich kroków czasowych, ale najlepsza w odniesieniu do okresów 9-miesięcznych. Uzyskane wyniki mogą stanowić naukowe wsparcie w walce z suszą.

Słowa kluczowe

EN

drought; effective drought index; standardised precipitation index; wadi Louza

PL

wskaźnik suszy efektywny; susza; ued Louza; wskaźnik standaryzowanego opadu

• Wydawca: Wydawnictwo ITP
• Czasopismo: Journal of Water and Land Development
• Rocznik: 2016
• Tom: no. 31
• Strony: 33--41
• Opis fizyczny: Bibliogr. 31 poz., rys., tab.

Twórcy

autor

Djellouli F.

• University of Tlemcen, Laboratory No. 25, BP119, 13000, Tlemcen, Algeria

autor

Bouanani A.

• University of Tlemcen, Laboratory No. 25, BP119, 13000, Tlemcen, Algeria

autor

Baba-Hamed K.

• University of Tlemcen, Laboratory No. 25, BP119, 13000, Tlemcen, Algeria

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).