Hydrogeomorphology of asymmetric meandering channels: experiments and field evidence

Abad, J. D.; Motta, Davide; Guerrero, Leo; Paredes, Marco A.; Kuroiwa, Julio; García, Marcelo H.

doi:10.1002/essoar.10512722.1

Cited by 2 publications

(2 citation statements)

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“…Figure 1E shows that the P-S wetland includes different river systems: self-formed meandering (Ucayali, Huallaga, Tigre, Tapiche, Puinahua), underfit-scavenger-formed meandering (Yanayacu, Frontiers in Environmental Science frontiersin.org Pacaya, Samiria), and anabranching (Marañon, Amazonas). The Huallaga, Ucayali, and Tapiche Rivers enter the P-S wetland with an increase in the valley angle-50, 55, and 70 °, respectively, thus avulsion processes and meandering migration rates are enhanced (Abad et al, 2022a;Abad et al, 2022b). As observed in Figure 1E, there is a reduction in valley angle, promoting the birthplace of the Frontiers in Environmental Science frontiersin.org Amazon River as the confluence of the Marañon and Ucayali Rivers (Garcia et al, 2022;Guerrero et al, 2022).…”

Section: Study Areamentioning

confidence: 99%

Free and underfit-scavenger river dynamics dominate the large Amazonian Pacaya-Samiria wetland structure

Rojas

Abad²,

Roque³

et al. 2023

Front. Environ. Sci.

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The Peruvian Amazon is known for harboring the greatest biodiversity on the planet, with a world record for biodiversity per unit area. Previous studies suggested that the high ecological value depends on correlations between ecosystem functionality and seasonal inundation control vegetation patches. However, the knowledge on how river morphodynamics and its complex erosion-depositional processes influence the aquatic mosaic and fishing activity in the region is still incipient. This study examines the hydrogeomorphology of the Peruvian tropical wetland of Pacaya Samiria, located in Western Amazonia, and its role in the distribution of aquatic habitats. By using remote sensing techniques, the hydrogeomorphological connectivity that bounds the Pacaya Samiria National Reserve is characterized by ancient to modern river processes. Additionally, river signatures developed by the Ucayali, Marañon, Huallaga, Pacaya, and Samiria Rivers overlap with fish extraction and dominant vegetation to describe how geomorphology is associated with the spatial distribution of fishing zones. Results indicated that paleochannels regulate wetland drainage within the Ucamara Depression, supporting stational water stagnation, vegetation cover, and formation of carbon rich detritus, relevant aspects to understand fish traits. Moreover, the Ucayali River dominates river dynamics in the Pacaya Samiria wetland, thus playing a pivotal role in shaping the complexity of streams and lakes. Furthermore, underfit-scavenger meandering rivers are observed in areas where paleochannels from large rivers are found. A geomorphological characterization of drainage patterns in freshwater environments, such as Amazonian wetlands, is crucial to develop sound management strategies. This methodological approach is expected to support decision-making in conservation actions in Amazonian environments based on understanding wetland connectivity and hydrogeomorphological behavior and their influence on commercial fisheries.

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Section: Study Areamentioning

confidence: 99%

Free and underfit-scavenger river dynamics dominate the large Amazonian Pacaya-Samiria wetland structure

Rojas

Abad²,

Roque³

et al. 2023

Front. Environ. Sci.

View full text Add to dashboard Cite

show abstract

“…The post-processed data from experiments and field measurements is available in the Zenodo repository (Abad, 2023), which can be accessed at https://zenodo.org/record/7921103.…”

Section: Data Availability Statementmentioning

confidence: 99%