RT Journal Article T1 Unmanned Aerial System‑Based Multispectral Water Quality Monitoring in the Iberian Pyrite Belt (SW Spain) A1 Isgró, Melisa A. A1 Basallote Sánchez, María Dolores A1 Barbero González, Luis Carlos AB AbstractFew studies have assessed mining-associated water pollution using spectral characteristics. We used high-resolution multispectraldata acquired by unmanned aerial drones combined with in situ chemical data to assess water quality parametersin 12 relatively small water bodies located in the Tharsis complex, an abandoned mining area in the Iberian pyrite belt(SW Spain). The spectral bands of Micasense RedEdge-MX Dual and spectral band combinations were used jointly withphysicochemical data to estimate water quality parameters and develop reliable empirical models using regression analysis.Physicochemical parameters including pH, ORP, EC, Al, Cu, Fe, Mn, S, Si, and Zn were estimated with high accuracy levels(0.81 < R2< 0.99, 4 < RMSE% < 75, 0.01 < MAPE < 0.97). In contrast, the observed and modelled values for Ba, Ca, andMg did not agree well (0.42 < R2< 0.70). The best-fitted models were used to generate spatial distribution maps, providinginformation on water quality patterns. This study demonstrated that using empirical models to generate spatial distributionmaps can be an effective and easy way to monitor acid mine drainage. PB Mine Water and the Environment SN 1025-9112 SN 1616-1068 (electrónico) YR 2021 FD 2021 LK http://hdl.handle.net/10272/20786 UL http://hdl.handle.net/10272/20786 LA eng NO Isgró, M. A., Basallote, M. D., & Barbero, L. (2021). Unmanned Aerial System-Based Multispectral Water Quality Monitoring in the Iberian Pyrite Belt (SW Spain). In Mine Water and the Environment. Springer Science and Business Media LLC. https://doi.org/10.1007/s10230-021-00837-4 NO This study was supported in part by the ErasmusMundus Joint Master Degree (EMJMD) in Water and Coastal Management(WACOMA) with the contribution of the Erasmus+ Programmeof the European Union. This work was also supported by Plan Andaluzde Investigación RNM 166 Environmental radioactivity research group(LB). UAS equipment from University of Cádiz Drone Service supportedby MINECO infrastructure projects (EQC2018-00446-P andUNCA-2013-1969). M.D. Basallote thanks the Spanish Ministry ofScience and Innovation for the Postdoctoral Fellowships granted underapplication reference IJC2018-035056-I. The authors also thank to the editors and two anonymous reviewers for their support and comments,which notably improved the quality of the original paper. DS Repositorio Institucional de la Universidad de Huelva RD 31 may 2026