Connectivity and hydrological efficiency dynamics at active volcanoes, Mexico
Por:
Ortiz-Rodriguez, A. J., Capra, L., Muñoz-Robles C., Coviello, V, Borselli, L.
Publicada:
1 ene 2020
Resumen:
Connectivity is an emergent property that describes how complex topography favors or impedes sediment transfer processes. In active volcanic areas, high connectivity may lead to extremely efficient processes, such as lahars. The aim of the present study is to examine the behavior (activation–deactivation) of sub-basins affected by volcanic and anthropogenic processes by studying the changes in connectivity and hydrological efficiency. Two volcanic zones in Mexico were selected: Volcán de Colima and Popocatépetl volcano, the two most active and dangerous volcanoes in the country. The joint index of connectivity (ICJ) and lateral hydrological efficiency index (LHEI) were calculated for both volcanic areas in basins recently affected by eruptive activity (Volcán de Colima) and co-seismic landslides (Popocatépetl). The analyses enabled the identification of eleven recently activated sub-basins (3.82 km2) at the Volcán de Colima and fifteen (3.77 km2) at the Popocatepetl volcano, as a consequence of natural processes and economic activities. Critical thresholds indicating the percentage area of land cover/use at which a sub-basin reaches high or very high LHEI values and the percentage of land cover/use change required for a sub-basin to modify its behavior (activation–deactivation) were identified using classification trees. The holistic capacity of the concepts of connectivity and hydrological efficiency permits analyzing the spatiotemporal variations of sediment transport based on the interactions between the hydrogeomorphological dynamics of volcanic processes and the territorial impact of socio-economical activities. Through this approach, new active areas have been identified in both volcanoes; the knowledge of the processes that occurred in these areas represents a key factor for hazard and risk assessment for the population in the near future. © 2020 Elsevier B.V.
Filiaciones:
Ortiz-Rodriguez, A. J.:
Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla 300, Querétaro, Qro 76230, Mexico
Univ Nacl Autonoma Mexico, Ctr Geociencias, Blvd Juriquilla 300, Queretaro 76230, Qro, Mexico
Capra, L.:
Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla 300, Querétaro, Qro 76230, Mexico
Univ Nacl Autonoma Mexico, Ctr Geociencias, Blvd Juriquilla 300, Queretaro 76230, Qro, Mexico
Muñoz-Robles C.:
Instituto de Investigación de Zonas Desérticas, Universidad Autónoma de San Luis Potosí, Altair No. 200, Col. Del Llano, San Luis Potosí, S.L.P. C.P. 78377, Mexico
Coviello, V:
Free University of Bozen-Bolzano, Facoltà di Scienze e Tecnologie Piazza Università, Bolzano, 5 - 39100, Italy
Free Univ Bozen Bolzano, Fac Sci & Tecnol, Piazza Univ 5, I-39100 Bolzano, Italy
Borselli, L.:
Instituto de Geología, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava No. 5. Zona Universitaria, San Luis Potosí, S.L.P. C.P. 78240, Mexico
Univ Autonoma San Luis Potosi, Inst Geol, Av Manuel Nava 5, San Luis Potosi 78240, San Luis Potosi, Mexico
Univ Autonoma San Luis Potosi, Inst Invest Zonas Desert, Altair 200, San Luis Potosi 78377, San Luis Potosi, Mexico
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