Trend detection of hydroclimatic parameters in central coastal basin of Oran in Algeria: is there any impact on water resources?

Autor: Djelloul Baahmed, Abdelkader Iddou, Rym Ait-Mohamed Amer, El Amine Cherif
Rok vydání: 2021
Předmět:
Zdroj: Arabian Journal of Geosciences. 14
ISSN: 1866-7538
1866-7511
Popis: The present work aims to study the climate variability as well as the rainfall and temperature trends; it also tries to examine their impact on the annual runoff along with the piezometric level of aquifers in north-western Algeria. The time series that were recorded and analyzed during the period extending from 1927 to 2012 concerned four subwatersheds that belong to the central coastal basin of Oran. Some nonparametric tests (at the 5% level) were carried out; they allowed detecting significant decreasing rainfall and runoff trends and strongly increasing temperature trend, during the period between 1927 and 2012 in the four subbasins. In addition, the breakup dates were detected in 1975 and 1981 for the rainfall time series, with a decrease between 24 and 39 %; the runoff time series were detected 1974 and 1975, in with a drop between 52 % and 70 %; the temperature time series were observed in 1985 with an increase of about 5%. In addition to the agricultural and industrial activities, the rainfall decrease and temperature increase also affected the piezometric level of the aquifers in the western watershed under study. Indeed, this level diminished significantly from 1 to −130m, after the break date (tipping point) in the rainfall time series.
Databáze: OpenAIRE
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