ORCID
0000-0002-5627-5412 (Alorda-Kleinglass)
Document Type
Article
Publication Date
2025
DOI
10.1016/j.jhydrol.2025.133616
Publication Title
Journal of Hydrology
Volume
661
Issue
B
Pages
133616 (1-16)
Abstract
Chemical fluxes supplied by Submarine Groundwater Discharge (SGD) can be relevant for coastal ecosystems, particularly lagoonal environments. An appropriate understanding of SGD requires constraining the magnitude and composition of its different pathways. However, the evaluation of SGD pathways is often limited to independent estimations, lacking a comprehensive understanding of the groundwater processes at play. In this study, we combined a Ra mass balance and hydrogeological modeling to simultaneously estimate different SGD pathways flowing into a coastal lagoon. We assessed water fluxes derived from fresh SGD, long-scale recirculation of seawater, and porewater exchange (PEX) into Mar Menor, a highly anthropized coastal lagoon. The evaluation conducted in multiple monthly samplings (n = 17) in 2021–2022 revealed that recirculation pathways accounted for >96 % of total SGD. The magnitude of fresh groundwater discharge ranged from 5.4x10³ to 130x10³ m³ d-¹, long-scale recirculation ranged from 19x10⁵ to 25x10⁵ m³ d-¹, and PEX ranged from 4.8x10⁵ to 41x10⁵ m³ d-¹. PEX water inputs were one order of magnitude higher in summer compared to winter. The seasonality observed in summer is likely influenced by high temperature accelerating infaunal activity within the sediments, enhancing bioirrigation across the lagoon. A preliminary estimation of PEX-derived nutrient release from the sediment to the water column is estimated to be comparable to or exceed all other nutrient sources. This could be contributing to eutrophication processes occurring in this lagoon, particularly in summer. Resolving the PEX contribution is critical for predicting water quality and implementing new management strategies in lagoonal ecosystems.
Rights
© 2025 The Authors.
This is an open access article under the Creative Commons Attribution-NonCommercial 4.0 International (CC-BY-NC 4.0) License.
Data Availability
Article states: "Data will be made available on request."
Original Publication Citation
Rodriguez-Puig, J., Rodellas, V., Diego-Feliu, M., Alcolea, A., Jimenez-Martinez, J., Alorda-Montiel, I., Alorda-Kleinglass, A., Pereira, F., Manzano, M., Gilabert, J., & Garcia-Orellana, J. (2025). Seasonality of submarine groundwater discharge pathways in a coastal lagoon revealed by radium isotopes: The importance of porewater exchange in summer. Journal of Hydrology, 661, 1-16, Article 133616. https://doi.org/10.1016/j.jhydrol.2025.133616
Repository Citation
Rodriguez-Puig, Júlia; Rodellas, Valentí; Diego-Feliu, Marc; Alcolea, Andres; Jiménez-Martínez, Joaquín; Alorda-Montiel, Irene; Alorda-Kleinglass, Aaron; Pereira, Francisco; Manzano, Marisol; Gilabert, Javier; and Garcia-Orellana, Jordi, "Seasonality of Submarine Groundwater Discharge Pathways in a Coastal Lagoon Revealed by Radium Isotopes: The Importance of Porewater Exchange in Summer" (2025). OES Faculty Publications. 543.
https://digitalcommons.odu.edu/oeas_fac_pubs/543
Appendix A. Supplementary Data
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