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Impact of rainfall structure and climate change on soil and groundwater salinization

Author

Listed:
  • Fairouz Slama

    (University of Tunis El Manar)

  • Emna Gargouri-Ellouze

    (University of Tunis El Manar)

  • Rachida Bouhlila

    (University of Tunis El Manar)

Abstract

Irrigated areas, mainly in arid regions, are threatened by salinization processes. Climate change inducing temperature rise and rainfall depletion are expected to enhance these processes. Numerical models are often used to predict salinization in the root zone as well as water and solute fluxes reaching groundwater. Climatic data, mainly rainfall, have an important influence on the estimation of those fluxes. The present paper studies the impact of rainfall structure and climate change on soil and groundwater salinization. Soil samples were collected in three drip-irrigated plots in Korba semi-arid coastal plain in Tunisia during dry and wet seasons. Collected field data (water contents and soil salinities) are used to define the initial solute and flow conditions and to estimate the soil hydraulic parameters for numerical modeling. Daily rainfall structure and annual rainfall transition under both Markov Chain and climate change (RCP4.5 and RCP8.5) are assessed. Different climatic scenarios are then introduced as boundary conditions in HYDRUS-1D, to test the influence of rainfall on the salinity evolution in the soil profile and groundwater. Results show that both annual rainfall amounts and daily structure have an impact on soil concentrations and solute fluxes quantities reaching groundwater. The influence of rainfall paths is more important for larger unsaturated zone thickness when considering the dry and median rainfall conditions. Climate change scenarios show significant accumulation of salts in the root zone implying the imperative use of adequate irrigation practices.

Suggested Citation

  • Fairouz Slama & Emna Gargouri-Ellouze & Rachida Bouhlila, 2020. "Impact of rainfall structure and climate change on soil and groundwater salinization," Climatic Change, Springer, vol. 163(1), pages 395-413, November.
    • Handle: RePEc:spr:climat:v:163:y:2020:i:1:d:10.1007_s10584-020-02789-0
    DOI: 10.1007/s10584-020-02789-0
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    References listed on IDEAS

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    1. Richard G. Taylor & Martin C. Todd & Lister Kongola & Louise Maurice & Emmanuel Nahozya & Hosea Sanga & Alan M. MacDonald, 2013. "Evidence of the dependence of groundwater resources on extreme rainfall in East Africa," Nature Climate Change, Nature, vol. 3(4), pages 374-378, April.
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    Cited by:

    1. Guoshuai Wang & Bing Xu & Pengcheng Tang & Haibin Shi & Delong Tian & Chen Zhang & Jie Ren & Zekun Li, 2022. "Modeling and Evaluating Soil Salt and Water Transport in a Cultivated Land–Wasteland–Lake System of Hetao, Yellow River Basin’s Upper Reaches," Sustainability, MDPI, vol. 14(21), pages 1-23, November.
    2. Azhgaliyeva, Dina & Rahut, Dil, 2022. "Promoting Green Buildings: Barriers, Solutions, and Policies," ADBI Working Papers 1331, Asian Development Bank Institute.
    3. José-Luis Molina & Susana Lagüela & Santiago Zazo, 2021. "Methodology to Evaluate Aquifers Water Budget Alteration Due to Climate Change Impact on the Snow Fraction," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 35(8), pages 2569-2583, June.

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