This paper mainly aims to illustrate an irrigation management tool to simulate scheduling of dist... more This paper mainly aims to illustrate an irrigation management tool to simulate scheduling of district-level water needs over the course of an irrigation season. The tool is mostly based on a daily model for simulating flow of water (and solutes) in heterogeneous agri-environmental systems (called FLOWS-HAGES). The model produces information on the daily evolution of: soil water contents and pressure potentials in the soil profile; water uptake and actual evapotranspiration; stress periods for each crop; return fluxes to the groundwater and their quality in terms of solute concentrations (e.g., nitrates). FLOWS-HAGES provides a daily list of hydrants to be operated according to water or crop-based criteria. The daily optimal sequence of hydrant use may thus be established by passing the volumes to be delivered on to the model for simulating the hydraulics of the irrigation network, in order to ensure that the discharges flowing inside the network of distribution pipes are delivered under optimal pressure head distribution in the system. All the above evaluations can be carried out in a stochastic framework to account for soil heterogeneity and climate changes. To illustrate the potential of FLOWS-HAGES, a case study was considered for a selected sector of the Irrigation District 10 in the "Sinistra Ofanto" irrigation system (southern Italy, Apulia region). In a 139 ha area (Sector 6 of the Irrigation District), soil profiles were analyzed for characterization of hydraulic properties variability. Hydraulic properties were determined by a combination of field and laboratory measurements. Model simulations were validated by comparing soil water storage simulated and measured by a sensor based on electromagnetic induction technique. Irrigation water volumes and frequency calculated by the model were compared to the volumes actually supplied by the farmers. Compared to the farmers behavior, the model simulates more frequent irrigations with lower irrigation volumes. Finally, some indexes of irrigation performance were calculated for each farm under study. The resulting maps provide useful information on the spatial distribution of farmer behavior, indicating the abuse or underuse of water as well as the fraction of the water lost by drainage following the irrigation method applied.
This paper mainly aims to illustrate an irrigation management tool to simulate scheduling of dist... more This paper mainly aims to illustrate an irrigation management tool to simulate scheduling of district-level water needs over the course of an irrigation season. The tool is mostly based on a daily model for simulating flow of water (and solutes) in heterogeneous agri-environmental systems (called FLOWS-HAGES). The model produces information on the daily evolution of: soil water contents and pressure potentials in the soil profile; water uptake and actual evapotranspiration; stress periods for each crop; return fluxes to the groundwater and their quality in terms of solute concentrations (e.g., nitrates). FLOWS-HAGES provides a daily list of hydrants to be operated according to water or crop-based criteria. The daily optimal sequence of hydrant use may thus be established by passing the volumes to be delivered on to the model for simulating the hydraulics of the irrigation network, in order to ensure that the discharges flowing inside the network of distribution pipes are delivered under optimal pressure head distribution in the system. All the above evaluations can be carried out in a stochastic framework to account for soil heterogeneity and climate changes. To illustrate the potential of FLOWS-HAGES, a case study was considered for a selected sector of the Irrigation District 10 in the “Sinistra Ofanto” irrigation system (southern Italy, Apulia region). In a 139 ha area (Sector 6 of the Irrigation District), soil profiles were analyzed for characterization of hydraulic properties variability. Hydraulic properties were determined by a combination of field and laboratory measurements. Model simulations were validated by comparing soil water storage simulated and measured by a sensor based on electromagnetic induction technique. Irrigation water volumes and frequency calculated by the model were compared to the volumes actually supplied by the farmers. Compared to the farmers behavior, the model simulates more frequent irrigations with lower irrigation volumes. Finally, some indexes of irrigation performance were calculated for each farm under study. The resulting maps provide useful information on the spatial distribution of farmer behavior, indicating the abuse or underuse of water as well as the fraction of the water lost by drainage following the irrigation method applied.
Nitrate pollution in groundwater of Mitidja, increases the risk of deterioration in the quality ... more Nitrate pollution in groundwater of Mitidja, increases the risk of deterioration in the quality of water resources and creates a health risk to people and the environment. This study aims to establish an inventory of groundwater pollution by nitrates in the groundwater of the Mitidja, monitor its temporal evolution and spatial distribution map using the ARC Gis software. The spatial distribution of nitrates in groundwater of the Mitidja shows that the majority of the points of catchments affected by this pollution are superimposed on agricultural areas. The temporal distribution of groundwater nitrate of Mitidja shows an increase facing agricultural intensification knows that this region, which may aggravate the situation quickly, thus inducing the deterioration of the quality of groundwater in this region and thus on the environment.
Biskra or Zibans, is located in a structural transition zone between the chain of the Saharan Atl... more Biskra or Zibans, is located in a structural transition zone between the chain of the Saharan Atlas Mountains and the Sahara. It is an arid region where the superficial water resource is the mild, hence the importance of the lithological description and the evaluation of aquifers rock’s volumes, which are highly dependent on the mobilized water contained in the various reservoirs (Quaternary, Mio-Pliocene, Eocene and Continental intercalary). Through a data synthesis which is particularly based on stratigraphic logs of drilling, the description of aquifers heterogeneity and the determining of the spatial variability of aquifer appearance became possible, by using geostatistical analysis, which allowed the representation of the aquifer thicknesses mapping and their space variation. The different thematic maps realized focus on drilling position, the substratum shape and finally the aquifers thicknesses of the region. It is found that the high density of water points especially these of drilling points are superposed on the hydrologic reservoirs with significant thicknesses.
La région des Zibans se situe dans une zone de transition géologique, hydrogéologique et climatiq... more La région des Zibans se situe dans une zone de transition géologique, hydrogéologique et climatique entre le domaine atlasique et le Sahara. La région de Biskra est marquée par de faibles précipitations et un intense pouvoir évaporant, ce qui a conduit à une exploitation accrue des eaux souterraines pour répondre aux besoins en particuliers agricoles. Cette ressource en eau est considérée comme peu renouvelable et dans ce contexte, l’analyse des épaisseurs du réservoir hydrogéologique Mio-Pliocène revêt une importance dans l’évaluation quantitative des eaux souterraines. A l’aide de 91 logs stratigraphiques, il a été réalisé la carte krigée des épaisseurs de la nappe Mio-Pliocène. Elle montre une large variabilité dans la répartition spatiale des courbes isopaches de l’aquifère en particulier selon les directions NE-SW et NW-SE.
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Papers by SENGOUGA Asma
The spatial distribution of nitrates in groundwater of the Mitidja shows that the majority of the points of catchments affected by this pollution are superimposed on agricultural areas. The temporal distribution of groundwater nitrate of Mitidja shows an increase facing agricultural intensification knows that this region, which may aggravate the situation quickly, thus inducing the deterioration of the quality of groundwater in this region and thus on the environment.
Through a data synthesis which is particularly based on stratigraphic logs of drilling, the description of aquifers heterogeneity and the determining of the spatial variability of aquifer appearance became possible, by using geostatistical analysis, which allowed the representation of the aquifer thicknesses mapping and their space variation.
The different thematic maps realized focus on drilling position, the substratum shape and finally the aquifers thicknesses of the region. It is found that the high density of water points especially these of drilling points are superposed on the hydrologic reservoirs with significant thicknesses.