Debris flows analysis based on dendrochronological approach at Ixtacamaxtitlan, Sierra Norte de Puebla, Mexico
Por:
Pablo-Pablo M.A., Franco-Ramos O., Alcántara-Ayala I.
Publicada:
1 ago 2020
Categoría:
Geology
Resumen:
Owing to their potential consequences, such as the disaster triggered by
hundreds of landslides in October 1999 in the mountain range Sierra
Norte de Puebla, mass movement processes are among the most significant
geomorphological hazards in Mexico. In this paper, we presented the
reconstruction and analysis of debris flows at two valleys located on
the Tenextepecuaco mountain in the Sierra Norte de Puebla, based on
geomorphologic and dendrogeomorphic methods. From 37 Juniperus deppeana
trees we made a Local Reference Chronology, also to dating and mapping
the debris flow events and finally for determine the
stability/instability of the landforms using the age of the trees. The
comparative analysis of the maximum rainfall series in 24 hours, for the
period from May to October from 1992 to 2013, and the tree-ring width
index suggested that in August 2007 and August 2010 two channels of the
western valley were reactivated triggered by heavy rainfall amounting 93
and 56 mm, respectively. As a result of such event, some tree-rings
series recorded a growth suppression, and that was also observed in
satellite images by Google EarthTM through changes in the vegetation
cover. Other trees showed a less growth suppressions in 2013 and the
channels were kept active. Since 2014, some trees showed a growth
release, and recolonization of trees was also identified in the
satellite imagery by Google EarthTM, suggesting an apparent
geomorphological stability. The applied methodology showed the potential
of Juniperus deppeana to be used for dendrogeomorphic studies in Mexico,
also in others geomorphic context. Additionally, particular results of
the study can contribute to the existing efforts on prevention and
mitigation of natural hazards within the regional context.
Filiaciones:
Pablo-Pablo M.A.:
Posgrado en Geografía, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, Ciudad de México, 04510, Mexico
Franco-Ramos O.:
Instituto de Geografía, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, Ciudad de México, 04510, Mexico
Alcántara-Ayala I.:
Instituto de Geografía, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, Ciudad de México, 04510, Mexico
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