RT Journal Article T1 Application of the Comparison of Multibeam Echo-Sound Records to the Study of Stability of a Toxic Waste Stockpile Located on the Margin of a Tidal System: Tinto Estuary, Huelva, SW Spain A1 Carro Flores, Berta A1 Reyes, Alejandro A1 Morales González, Juan Antonio A1 Borrego Flores, José AB For more than 40 years, the industrial complex which developed near Huelva (in SW Spain)produced a huge amount of phosphogypsum as a waste product of manufacturing fertilizers. Thiswaste was stockpiled in a stack 25 m high, covering 1200 ha of what was once a salt marsh. Theweight of that enormous amount of waste produced active subsidence in the underlying sediment.Part of the sediment was injected into the marginal areas, where the load pressure is minor, causingsignificant vertical movement in the floor of the estuarine channel. This manuscript describes severalsurficial features using multibeam echosound. A crest formed by cones and a bulge area could beinterpreted as injection structures. The evolution of the topographic position of the floor was alsoanalyzed by comparing different records of the estuarine bed in the margins of the stockpile. Thedata in this work document the changes in the dynamics of the estuary in relation to these verticalmovements. These changes in dynamicsled to erosion and deposition in various areas of the bed PB MDPI SN 2072-4292 (electrónico) YR 2021 FD 2021 LK http://hdl.handle.net/10272/20941 UL http://hdl.handle.net/10272/20941 LA eng NO Carro, B. M., Reyes, A., Morales, J. A., & Borrego, J. (2021). Application of the Comparison of Multibeam Echo-Sound Records to the Study of Stability of a Toxic Waste Stockpile Located on the Margin of a Tidal System: Tinto Estuary, Huelva, SW Spain. In Remote Sensing (Vol. 13, Issue 21, p. 4364). MDPI AG. https://doi.org/10.3390/rs13214364 NO This research was funded by the project “Balsas de Fosfoyesos”, Especial action 2017–2020of the Junta de Andalucia (Regional government): General Direction of Universities and co-fundedby the Ayuntamiento de Huelva (City Council of Huelva).We strongly acknowledge the technical support given by A. Palmeiro fromNautilus Oceanica S.L., who filtered and processed the multibeam records. We also acknowledge thecomments of three anonymous reviewers who contributed to substantially improving this article.The help of Alastair Peacocke regarding the English language also improved the original manuscrip DS Repositorio Institucional de la Universidad de Huelva RD 1 jun 2026