Análisis de la hidroconectividad del continuo fluvial-marino del Bajo Río Doce (ES, Brasil) por medio de geotecnologías
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Data
2022-11-04
Autores
Miller, Manuel Eduardo
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Universidade Federal do Espírito Santo
Resumo
The Lower Doce River (ES, Brazil) forms a complex hydrographic system composed of different aquatic ecosystems with its genesis influenced by geological, climatic, hydrological, and anthropogenic processes, forming a fluviomarine continuum from the upper basin to the mouth. In this work, spatial and temporal aspects that define the hydroconnectivity of aquatic ecosystems are analyzed concerning the river basin topography and the spatial variability of permanent and transitory water bodies. Along the fluviomarine continuum, natural and anthropogenic river filters were investigated for their role in the transport/transformation of materials in the lower river basin. Permanent and transitory water bodies were mapped with supervised classifications of synthetic aperture radar (SAR) satellite data with a spatial resolution of 10 m and an overall accuracy greater than 93%. These results allowed evaluation of temporal changes for three high-flow events, providing information about the contribution of river materials to the coastal plain, particularly at dates where atmospheric conditions do not allow obtaining data from optical sensors. The spatiotemporal behavior of the wetland system was also detected and mapped with unsupervised multitemporal classifications of SAR data concerning flood and drought pulses, with an overall accuracy of 81.9%. A semiempirical model for measuring surface water turbidity, with an accuracy of 92%, was created using multispectral satellite data as input and adjusted with synchronous in situ turbidity data. This model was applied on different dates for the river water, lakes, and the estuarine plume after the Fundão fluviomarine system. Hydrometeorological variables such as rainfall, wind, river flow, and fluvial level were incorporated into the analysis to contextualize the results obtained throughout the study.
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Filtros fluviales , Humedales , Turbidez