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Local strategies to manage groundwater depletion under climate change scenarios—a case study: Hamedan-Bahar Plain (Iran)

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Abstract

Climate changes and the unremitting overexploitation of groundwater in the Hamedan-Bahar Plain have raised concerns about the sustainability of groundwater resources. The current research focused on the development of an integrated system dynamics model to examine the long-term effects of employing five adaptation strategies on groundwater. The model was calibrated and validated using a 21-year historical data set, and the strategies were combined into 21 management and climate change scenarios (seven management scenarios in tandem with three climate change scenarios) to project groundwater levels for the period 2020–2050. Future climatic conditions were projected by downscaling the data of the CanESM2 general circulation model under three representative concentration pathway scenarios (RCP2.6, RCP4.5, and RCP8.5). By applying the business-as-usual management scenario, the groundwater table change rates will be −0.37, −0.45, and −0.44 m/year under the RCP2.6, RCP4.5, and RCP8.5 scenarios, while the corresponding rates for the most efficient management scenario are +0.22, +0.11, and +0.13 m/year, respectively. The strategies have been ranked according to their effectiveness as follows: (i) reducing irrigated agriculture in favor of rainfed agriculture or fallow fields, (ii) applying an adaptive cropping pattern, (iii) developing early-maturing cultivars, (iv) practicing deficit irrigation, and (v) enhancing irrigation efficiency. The findings indicate that the local management strategies will play a greater role in future groundwater sustainability than global climate change.

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Data availability

The authors do not have the permission to share the database that supports the findings of this study, due to RWCH and HWW data access permissions. However, one can apply for the databases using the following contact information: info@hmrw.ir and info@hww.ir.

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Code availability

The corresponding author confirms that the model used in this study is available upon request.

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Correspondence to Hamid Zare Abyaneh.

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The authors declare that they have no competing interests.

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Responsible Editor: Amjad Kallel

Appendix

Appendix

Fig. 9
figure 9

Stock-and-flow diagram of the agricultural groundwater demand and soil water balance subsystem

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figure 10

Stock-and-flow diagram of the municipal (urban and rural) and industrial water demands subsystem

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figure 11

Stock-and-flow diagram of the groundwater storage subsystem

Table 5 The variables of the HanBarSD model

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Afruzi, A., Zare Abyaneh, H. & Abdolabadi, H. Local strategies to manage groundwater depletion under climate change scenarios—a case study: Hamedan-Bahar Plain (Iran). Arab J Geosci 14, 1548 (2021). https://doi.org/10.1007/s12517-021-07773-1

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  • DOI: https://doi.org/10.1007/s12517-021-07773-1

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