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Modelling soil moisture and solute transport under water reuse irrigation and climate change scenarios in the Nile Delta Region
Zitatschlüssel 2021_sabri_5th_arabwater_forum
Autor Sabri,D., Tischbein, B. & Hinkelmann, R.
Jahr 2021
Wie herausgegeben Arab Water Council: 5th Arab Water Forum, Sep. 21-23, 2021, Abu Dhabi, UAE, conference paper and oral presentation
Zusammenfassung Egypt has been reported to be among the most vulnerable countries to climate change. Egyptian agriculture is entirely dependent on irrigation and its sole source is the Nile River. Any increase in temperature may affect water resources which would increase the stress on agricultural production. Adaptation policies should therefore be developed to cope with the adverse impacts of climate change and should address three areas: crop management, water management, and land management. This field experiment was carried out in two fields (F1, F2) in Mahalet-Roh near Tanta city in the Nile Delta to investigate potential impacts of the reuse water on soil characteristics and groundwater quality. A climate change scenario was considered to simulate the effect of reuse water for irrigation presuming an increase in temperature by 2025. Experimental fields were irrigated with mixed water from the irrigation canal and the surface drain characterized by electrical conductivity (EC) ranging between 1.0 to 1.4 dS/m. While F1 has tile, drains installed at lateral spacings of 30 m and drain depth of 1.5 m installed, no tile pipes were installed in F2. HYDRUS-2D software was used to simulate soil water movement and solute transport during the cropping season. The simulated soil water contents curves were in good agreement with the observations soil water content. HYDRUS 2D calibration and validation process were evaluated by the root-mean-square-error (RMSE). RMSE values for fields F1 and F2, ranged from 0.068 to 0.074 and 0.052 to 0.063 cm3 / cm3, respectively. Values of the resulting RMSE indicated a very good fit of measured and simulated data. Overall, salinity distribution showed that higher soil salinity was recorded in field F2 when compared to F1 indicating that salt accumulation increased in the absence of drainage network under the same irrigation water salinity which enhances leaching, and hence could be used as a measure for soil salinity management in irrigation schemes.
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