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Hydrological variability of the Soummam watershed (Northeastern Algeria) and the possible links to climate fluctuations

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Hydrological variability of the Soummam watershed (Northeastern Algeria)

and the possible links to climate fluctuations

Authors

Imen Turki, Benoit Laignel, Nicolas Massei, Zeneddine Nouaceur, Nadir Benhamiche, Khodir Madani

Publication date 2016/5/1

Journal

Arabian Journal of Geosciences Volume 9 Issue 6 Pages 477 Publisher

Springer Berlin Heidelberg Description

The long-term variability of rainfall in the Soummam watershed (NE Algeria) has been analysed over the past 108 years using continuous wavelet method in order to identify the interannual modes controlling the rainfall variability. Statistical analyses of rainfall timeseries have shown its distribution following five periods of time, limited by a series of discontinuities around 1935, 1950, 1970 and 1990. The continuous wavelet transform have demonstrated different low frequency modes: 2–4, 4–8, 8–16 and 16–32 years.

The annual band is expanded during the full study period with some pics around 1905, 1920–1935 and 1960; it shows a negative long-term trend, in particular since the period 1970–1990 when a major change has been identified. Then, the relationships between climate patterns of North Atlantic Oscillation (NAO) and Southern Oscillation Index (SOI) and the hydrological variability in …

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