Juan Camilo Restrepo
Alice Newton
Barend Van Maanen
Juan Darío Restrepo-Angel
Marius Becker- 1Physics and Geosciences Department, Grupo de Investigación en Geofísica GEO4, Universidad del Norte, Barranquilla, Colombia
- 2Department of Earth, Environmental and Marine Sciences, University of Algarve, Faro, Portugal
- 3Department of Geography, University of Exeter, Exeter, United Kingdom
- 4Department of Earth Sciences, School of Sciences, Universidad Eafit, Medellín, Colombia
- 5Institute of Geosciences, Kiel University, Kiel, Germany
Editorial on the Research Topic
Highly intervened estuaries: impacts, dynamics and system responses
1 Background
Estuaries are among the most degraded and threatened environments worldwide (Scown et al., 2023; Syvitski and Saito, 2007). Highly intervened estuaries with altered environments are the result of human-engineered interventions (e.g., sluice gates, jetties, dikes, impoundments, training walls, port facilities, and dredging), land reclamation, changes in upstream land use, and human-induced pollution (e.g., Nichols et al., 1986; Lotze et al., 2005; Pye and Blott, 2014). Human interventions have modified the hydrodynamics, morphology, and geochemistry of these systems, leading to large deviations from the expected natural state and functioning (e.g., Jiang et al., 2012; Brunier et al., 2014; Zhu et al., 2017; Zarzuelo et al., 2018; Wang and Liu, 2019; Van der Spek and Elias, 2021). Such deviations exhibit non-linear patterns, adding greater complexity to the dynamics of estuarine systems under climate change scenarios. Moreover, anthropogenic actions have altered the estuarine capability to adjust to the environmental change, including responding to increased pressures in the context of climate change. As a result, highly intervened estuaries exhibit a broad range of anomalous responses, including changes in circulation patterns, disturbances in mixing conditions, accelerated siltation, closure of distributary channels, shifts in residence time, severe shoreline retreat, estuarine turbidity maximum zone changes, and the accelerated loss of ecosystem services (e.g., filtering and nutrient recycling) (e.g., Yang et al., 2003; De Jonge et al., 2014; Yang et al., 2015; Restrepo et al., 2020; Guo et al., 2021).
Despite decades of human interventions in these estuarine ecosystems, the interactions between the different impacts, their effects, and the resulting dynamic response are still not fully understood and are becoming even more complex because of the multitude of anthropic pressures (Guo et al., 2021; Dunn et al., 2023). Human interventions lead to synergic effects, triggering not just differential responses in the estuarine components but also on different timescales (Yang et al., 2003; Van der Spek and Elias, 2021). Such a level of complexity raises questions about the degree of loss in ecosystem function and services, the resilience and capacity of assimilation or recovery, and the existence of physical, chemical, and ecological thresholds required to manage and restore highly intervened estuaries.
This article Research Topic highlights the analysis of altered processes in estuaries; brings insights into the responses to human disturbances, considering varying timescales and effects in the different components of estuarine systems; and promotes discussion about management and restoration strategies in highly intervened estuaries. The article Research Topic includes original research papers dealing with i) morphological and hydrodynamic responses of estuarine systems, considering different scenarios of engineered intervention and timescales; ii) assessment of significant changes in natural functions of estuaries (i.e., nutrients cycling, pollutant filtering, and critical habitats) after human interventions; iii) physicochemical degradation in estuaries triggered by heavily polluted river inputs and basin-scale processes; and iv) potential strategies to restore and recover ecosystem function and services in degraded estuarine systems.
Specifically, in this article Research Topic, van Maren et al. present the development and application of a methodology to estimate the estuarine response timescales against human interventions using available morphological and hydraulic data. Velasquez et al. offer a detailed comparison of the effects on hydrodynamic and morphological patterns in tidal inlets derived from coastal protection interventions (from gray to green infrastructure). Gallo et al. and Leyva et al. provide a socio-ecological assessment of two heavily altered systems, applying a multi-dimensional approach, that highlights the sources and drivers of pollution and degradation, the need for preserving and restoring critical habitats, and the barriers and gaps to obtain sustainable development. Overall, this article Research Topic spotlights the response time and magnitude of a system to human interventions, as determined by the processes driving the change, the size of the system, and the magnitude of such interventions. Nevertheless, distinctive effects must consider the unique patterns of each specific site. The Research Topic also highlights the interest in addressing approaches aimed at recovering and increasing the environmental resilience of these valuable ecosystems.
Author contributions
JR: writing–original draft and writing–review and editing. AN: writing–review and editing. BM: writing–review and editing. JR-A: writing–review and editing. MB: writing–review and editing.
Acknowledgments
As guest editors, they highly acknowledge all authors and reviewers who contributed to this Research Topic. Their effort, commitment, and innovation ensured the high quality of the accepted papers. The editors are incredibly grateful to the Editor in Chief of the journal and Frontiers’ specialist team for their support and patience.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors, and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
References
Brunier, G., Anthony, E., Goichot, M., Provansal, M., and Dussouillez, P. (2014). Recent morphological changes in the Mekong and Bassac river channels, Mekong delta: the marked impact of river-bed mining and implications for delta destabilisation. Geomorphology 224, 177–191. doi:10.1016/j.geomorph.2014.07.009
De Jonge, V., Schuttelaars, H., van Beusekom, J., Talke, S., and de Swart, H. (2014). The influence of channel deepening on estuarine turbidity levels and dynamics, as exemplified by the Ems estuary. Estuar. Coast. Shelf Sci. 139, 46–59. doi:10.1016/j.ecss.2013.12.030
Dunn, F., Cox, J., Scown, M., Du, H., Triyanti, A., Middelkoop, H., et al. (2023). Sedimentation-enhancing strategies for sustainable deltas: an integrated socio-biophysical framework. One Earth 6 (12), 1677–1691. doi:10.1016/j.oneear.2023.11.009
Guo, L., Xu, F., van der Wegen, M., Townend, I., Wang, Z., and He, Q. (2021). Morphodynamic adaptation of a tidal basin to centennial sea-level rise: the importance of lateral expansion. Cont. Shelf Res. 226, 104494. doi:10.1016/j.csr.2021.104494
Jiang, C., Li, J., and Swart, H. (2012). Effects of navigational works on morphological changes in the bar area of the Yangtze estuary. Geomorphology 139–140, 205–219. doi:10.1016/j.geomorph.2011.10.020
Lotze, H., Lenihan, H., Bourque, B., Bradbury, R., Cooke, R., Kay, M., et al. (2005). Depletion, degradation, and recovery potential of estuaries and coastal seas. Science 312, 1806–1809. doi:10.1126/science.1128035
Nichols, F., Cloern, J., Luoma, S., and Peterson, D. (1986). The modification of an estuary. Science 231 (4738), 567–573. doi:10.1126/science.231.4738.567
Pye, K., and Blott, S. (2014). The geomorphology of UK estuaries: the role of geological controls, antecedent conditions and human activities. Estuar. Coast. Shelf Sci. 150, 196–214. doi:10.1016/j.ecss.2014.05.014
Restrepo, J. C., Orejarena, A., Consuegra, C., Pérez, J., Llinas, H., Otero, L., et al. (2020). Siltation on a highly regulated estuarine system: the magdalena river mouth case (northwestern south America). Estuar. Coast. Shelf Sci. 245, 107020. doi:10.1016/j.ecss.2020.107020
Scown, M., Dunn, F., Dekker, S., van Vuuren, D., Karabil, S., Sutanudjaja, E., et al. (2023). Global change scenarios in coastal river deltas and their sustainable development implications. Glob. Environ. Change 82, 102736. doi:10.1016/j.gloenvcha.2023.102736
Syvitski, J. P. M., and Saito, Y. (2007). Morphodynamics of deltas under the influence of humans. Glob. Planet. Changes 57 (3), 261–282. doi:10.1016/j.gloplacha.2006.12.001
Van der Spek, A., and Elias, E. (2021). Half a century of morphological change in the Haringvliet and Grevelingen ebb-tidal deltas (SW Netherlands) – impacts of large-scale engineering 1964-2015. Mar. Geol. 432, 106404. doi:10.1016/j.margeo.2020.106404
Wang, Z., and Liu, C. (2019). Two-thousand years of debates and practices of Yellow River training strategies. Int. J. Sediment Res. 34, 73–83. doi:10.1016/j.ijsrc.2018.08.006
Yang, S. L., Belkin, I. M., Belkina, A. I., Zhao, Q. Y., Zhu, J. R., and Ding, P. X. (2003). Delta response to decline in sediment supply from the Yangtze River: evidence of the recent four decades and expectations for the next half-century. Estuar. Coast. Shelf Sci. 57, 689–699. doi:10.1016/s0272-7714(02)00409-2
Yang, Z., Wang, T., Voisin, N., and Copping, A. (2015). Estuarine response to river flow and sea level-rise under future climate change and human development. Estuar. Coast. Shelf Sci. 156, 19–30. doi:10.1016/j.ecss.2014.08.015
Zarzuelo, C., López-Ruiz, A., D’Alpaos, A., Carniello, L., and Ortega-S´anchez, M. (2018). Assessing the morphodynamic response of human-altered tidal embayments. Geomorphology 320, 127–141. doi:10.1016/j.geomorph.2018.08.014
Keywords: morphological and hydrodynamic responses, timescales, human interventions, altered processes, management and restoration
Citation: Restrepo JC, Newton A, Van Maanen B, Restrepo-Angel JD and Becker M (2024) Editorial: Highly intervened estuaries: impacts, dynamics and system responses. Front. Earth Sci. 12:1414862. doi: 10.3389/feart.2024.1414862
Received: 09 April 2024; Accepted: 23 April 2024;
Published: 23 May 2024.
Edited and reviewed by:
Sabine Schmidt, Centre National de la Recherche Scientifique (CNRS), FranceCopyright © 2024 Restrepo, Newton, Van Maanen, Restrepo-Angel and Becker. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Juan Camilo Restrepo, cmVzdHJlcG9jakB1bmlub3J0ZS5lZHUuY28=