Linking the Evolution of the Andalién River Morphology (Central–Southern Chile) to Anthropogenic Interventions by Using a New QGIS Tool

Author:

Nardini Andrea Gianni Cristoforo1ORCID,Gonzalez Constanza2,Contreras Angela3,Velásquez Germán4,Vargas-Baecheler José2,Piégay Hervé5ORCID,Espinoza Joaquin3,Yépez Santiago6ORCID

Affiliation:

1. Fundación Centro de Recuperación de Ecosistemas Acuáticos (CREACUA), Riohacha 440001, La Guajira, Colombia

2. Departamento de Ingeniería Civil, Facultad de Ingeniería, Universidad de Concepción, Concepción 4030000, Chile

3. Departamento Ciencias de la Tierra, Ciencias Químicas, Universidad de Concepción, Concepción 4030000, Chile

4. Instituto de Geología Económica Aplicada—GEA, Universidad de Concepción, Casilla 160-C, Concepción 4030000, Chile

5. UMR 5600, CNRS EVS, ISIG Platform, University of Lyon, Site ENS de Lyon, 15 Parvis René Descartes, F-69362 Lyon, France

6. Departamento Manejo de Bosques y Medio Ambiente, Facultad de Ciencias Forestales, Universidad de Concepción, Concepción 4030000, Chile

Abstract

In recent decades, the interplay of several factors, including land use change (particularly urbanization) and global warming, has resulted in harsher flooding, often associated with geomorphic disruption. These events in Latin America are predominantly driven by the El Niño Southern Oscillation (ENSO) phenomenon. The Andalién River basin is no exception, with a notable incident occurring in July 2006. This reality points out the need to study the geomorphological behavior of rivers. Geomatic tools can contribute to address this issue, thereby improving the planning and management of water courses. This paper presents the assessment of the morphological evolution of the Andalién River, downstream to the city of Concepción in a period of 75 years (1945–2020), in response to changes in land use and anthropogenic interventions on the river itself. Based on temporal satellite imagery and historical aerial images (from 1945 to 2020) combined with digital elevation models (LiDAR and TamDEM-X data), morphological alterations are revealed, which were caused by urbanization and anthropogenic activities. We demonstrate how the South River Toolbox (SRT), an original GIS tool developing in QGIS (in-house), enables the extraction of key geomorphological features of a river and their analysis, including their time evolution. This retrospective analysis includes an innovative method and tool to measure the lateral migration rate of the active channel. Ultimately, this study provides valuable insights for future management strategies, offering a comprehensive basin-level analysis of the Andalién River and a cartographic framework to aid decision-making, planning, and management of the fluvial corridor.

Publisher

MDPI AG

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