Caractérisation hydro-chimique des eaux souterraines et son aptitude à l’irrigation, cas de la plaine de Mellagou (Bouhmama- Khenchela-)
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Date
2017-06-28
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Université Abbes Laghrour -Khenchela-
Abstract
Abstract
In the Mellagou plain (north-west of Khenchela), it character by a semi-arid climate
and strong evapotranspiration, the irrigation is very important for all most crops. Water’s
analysis of 11 wells are using for irrigation showed a chemical dominant sulphate calcic
facies. The "SAR" alkalinity risk analysis showed that the waters of boreholes intended for
irrigation in the study area have a high salinity, which entail a high risk (C3) or very high risk
(C4) of soils salinity under the influence of irrigation.A "SAR" alkalinity risk map
interpolated by the kriging method was prepared.
The map shows that "SAR" values are less than 10 throughout the study area, which
means a moderate risk of sodisation. The wells of the Mellagou plain are suitable only for
salt-tolerant crops irrigation, on well-drained or good-permeability soils.