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Climate variability and changes in shallow groundwater quality on Indonesia’s small tropical island

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Abstract

Generally, the water resources in small islands depend on limited shallow groundwater influenced by rainwater. So, understanding the climate variability affecting shallow groundwater is needed for the sustainability of water resources management on small islands. This study aims to determine the climate variability and other factors influencing the change in shallow groundwater quality on Pari Island, a small island in Indonesia. The study used Standardized Precipitation Evapotranspiration Index (SPEI) analysis to assess anomalous climate conditions. Traditional hydrochemistry analysis methods (Piper, Durov, Scholler, and Gibbs diagrams), ion ratios, and correlation were applied to determine the change in water quality and the factors that influence it. The results showed that high-intensity precipitation events are becoming more frequent. The correlation between electrical conductivity and short-term timescale SPEI was very strong, indicating groundwater quality's sensitivity to precipitation variations. The results of groundwater hydro-chemical analysis showed that differences in shallow groundwater quality in the dry and wet seasons were due to reverse ion exchange, rock weathering, and evaporation. Although the characteristics of freshwater were more substantial in the wet season than in the dry season, it was difficult to find true freshwater on Pari Island. Geographically, the influence of climate variability on Pari Island weakened from west to east, corresponding to patterns related to the direction of the monsoon winds of tropical Indonesia. The total organic carbon value also shows the same due to tidal seawater intrusions or domestic activities that still require further study to determine the source of organic matter.

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All data used for this study are included within the manuscript.

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Acknowledgements

The authors would like to thank to funding agency and all of the program managers on the COREMAP–CTI 2021-2022 project. The authors also thank each of the Pari Island communities who supported this study. The authors also acknowledge the facilities and scientific support from Advanced Characterization Laboratories Bandung, National Research and Innovation Agency, Republic of Indonesia through ELayanan Sains, Badan Riset dan Inovasi Nasional.

Funding

The study was fully funded by the COREMAP–CTI 2021-2022 (17/A/DK/2021) project titled Ketahanan Sumber Daya Air dan Lingkungan Pulau Pari Menuju Resilient Small Island (RSI).

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All authors have equal contributions to the study design and writing of this article, and read and approved the final manuscript.

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Correspondence to Dyah Marganingrum.

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The authors declare that there are no financial interests/personal relationships which may be considered as potential competing interests.

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Ethical clearance to conduct this study was granted by the Research Ethics Commission of Indonesian Institute of Sciences.

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The work described in this manuscript has not been published before and is not under consideration for publication anywhere else. It has been approved by all co-authors for publication.

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Marganingrum, D., Santoso, H., Wulan, D.R. et al. Climate variability and changes in shallow groundwater quality on Indonesia’s small tropical island. Sustain. Water Resour. Manag. 9, 79 (2023). https://doi.org/10.1007/s40899-023-00857-8

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  • DOI: https://doi.org/10.1007/s40899-023-00857-8

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