Iván Vergara

Iván Vergara
Center for Climate and Resilience Research | CR2

Geologist; PhD in Earth Sciences

About

18
Publications
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174
Citations
Introduction
My research focuses on current earth surface processes in the Andes, with an emphasis on geo-climatic hazards like landslides. Currently, I am also interested in the effects of climate change on glacial sediment dynamics and the physicochemical laws governing Earth’s denudation.

Publications

Publications (18)
Article
Full-text available
Glaciers are thinning and retreating as climate warms, thus eroding less of the Earth’s surface. However, other hydrological factors in glacierized catchments are likely producing a transient increase in sediment delivery, resulting in ‘peak sediment’. Estimating the trajectory of the peak sediment is ecologically and socially important but scienti...
Preprint
Full-text available
Denudation is the opposite process of mountain uplift and plays a major role in the Earth system. Despite the research to constrain its environmental control, uncertainties remain about which are the dominant physicochemical processes at play. Here, the 10Be-derived denudation rate, encompassing time windows from 102 to 105 yr, was modelled in over...
Article
Understanding how the environmental factors that determine erosion operate is essential to know the past and future evolution of the Earth and adequately manage natural resources. In this work, the main controlling factors of the current sediment export in the western side of the extratropical Andes (20°-55°S) are investigated using multidecadal se...
Preprint
Understanding how operate the environmental factors that determine erosion is essential to know the past and future evolution of the Earth and to carry out an adequate management of natural resources. Analyses using data from recent decades and much longer time windows (thousands to millions of years) are complementary because they allow to underst...
Article
Full-text available
A major storm impacted the subtropical Andes during 28–31 January 2021 producing 4-days accumulated precipitation up to 100 mm over central-south Chile. These are high accumulations even for winter events but the storm occurred in the middle of the summer when precipitation in virtually absent, conferring it an extraordinary character. Similar stor...
Article
Full-text available
Climate change may affect sediment fluvial export from high mountain regions, leading to downstream environmental disruptions and direct impacts on human activities. In this paper, three decades (1990–2020) of turbidity measurements, along with climate and hydro‐glaciological variables, were used to investigate the interannual and interdecadal vari...
Article
The systematic monitoring of landslides is an essential input for their characterization and subsequent reduction of their risk. Along the western subtropical Andes, field monitoring is scarce, so alternative methods that can improve the monitoring are valuable. In this work, the capacity of fluvial suspended sediment to detect the occurrence of la...
Preprint
Full-text available
A major storm impacted the subtropical Andes during 28-31 January 2021 producing 4-days accumulated precipitation up to 100 mm over central-south Chile. These are high accumulations even for winter events but the storm occurred in the middle of the summer when precipitation in virtually absent, conferring it an extraordinary character. Similar stor...
Article
Full-text available
This review paper compiles research related to debris flows and hyperconcentrated flows in the central Andes (30°-33° S), updating the knowledge of these phenomena in this semiarid region. Continuous records of these phenomena are lacking through the Andean region; intense pre-cipitations, sudden snowmelt, increased temperatures on high relief moun...
Article
Full-text available
Detecting and understanding historical changes in the frequency of geo-climatic hazards (G-CHs) is crucial for the quantification of current hazards and project them into the future. Here we focus in the eastern subtropical Andes (32–33∘ S), using meteorological data and a century-long inventory of 553 G-CHs triggered by rainfall or snowfall. We fi...
Preprint
Full-text available
Abstract. Detection and understanding of historical changes in the frequency of geo-climatic hazards (G-CHs) is crucial for the quantification of current hazard and their future projection. Here we focus in the eastern subtropical Andes (32–33° S), using meteorological data and a century-long inventory on 553 G-CHs triggered by rainfall or snowfall...
Article
Full-text available
Este trabajo presenta evidencias de la incidencia del ascenso de la temperatura en la degradación o fusión del permafrost y su asociación con descargas de flujos de detritos en la región andina (30º-32ºS). Este resultado permite enfatizar la relación entre los colapsos de laderas y la temperatura permitiendo vincular la inestabilidad de las laderas...
Article
Full-text available
Debris flows triggered from rapid melt of seasonal snow, and/or ice within the active layer have not been studied in periglacial areas of the semi-arid Andes. Therefore, through a representative watershed we investigated the thermo-radiative characteristics, the possible water sources, and the current and future frequency of these debris flows. Inf...
Article
Full-text available
The probabilities for the generation of hyperconcentrated flows, and debris and mud flows in the middle basin of Elqui River (Chile) are determined. The objective was achieved collecting, for a period of 14 years, the precipitation events generating highdischarge flows, as well as the larger precipitation events that did not generate this process....
Article
Full-text available
Since Holocene time, above-mean precipitations recorded during the El Niño warm ENSO phase have been linked to the occurrence of severe debris flows in the arid Central Andes. The 2015–2016 El Niño, for its unusual strength, began driving huge and dangerous landslides in the Central Andes (32°) in the recent South Hemisphere summer. The resulting d...
Article
Full-text available
This paper analyzes the geomorphological evolution of the Negro River’s mouth to understand how aerodynamic and hydrodynamic states of the Atlantic coast have developed to this date. Accordingly, the morphometry of the beach and the historical river flow record were studied. The results indicate a dichotomous state for this coast. The SW area is ch...
Conference Paper
Global climate change linked to meso-scale environment modifications such as regional above average precipitations, stronger El Niño-ENSO warm phase, global warming, permafrost degradation, and glacier retreatment could promote slope instability. However, which of these mechanisms is leading landslide activity in the high mountain landscape of Cent...
Article
Full-text available
The Central-West region of Argentina was seriously affected by a series of convective summer storms on January–February of 2013 generating many debris flows and rockfall in the Central Andes mountain regions. In particular, the unreported 8th February event caused the sad death of a 10-year-old child being completely ignored by society and local au...

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