2018 CSDMS meeting-117: Difference between revisions

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|CSDMS meeting abstract=The watershed of the Tapartó and Farallones rivers and the La Arboleda stream in the central zone of the Colombian Cordillera Occidental, are characterized by presenting important debris flows events at historical level, in turn, show geomorphological evidences that suggest a complex dynamic associated with the conditions of high slope, high rainfall and a soil profile with an important development.
|CSDMS meeting abstract=The watershed of the Tapartó and Farallones rivers and the La Arboleda stream in the central zone of Colombia’s western mountain range are known to have experienced important debris flow events historically. In the same manner, there is geomorphological evidence that suggests a complex dynamic associated with the conditions of high slope, heavy rainfall and a soil profile with an important development.
The geomorphological analysis carried out in these watersheds allowed the recognition of different levels of deposits, in addition to the stratigraphic characterization of the same. Likewise, radiocarbon dating allowed to establish ages between 100 +/- 30 and 2010 +/- 30 years for the different levels of deposits characterized. The integration of geomorphological, stratigraphic information and radiocarbon dating allowed to differentiate the debris flows dynamics of each of the basins and suggests the establishment of three phases, the first of them of an ancient character (with deposits older than 2000 years), a sub-recent dynamic (represented by levels between 1500 and 2000 years) and a current dynamic, with low incised deposits systems and ages not exceeding 500 years. Finally, it was established that, although these basins have a great potential for the generation of debris flows events of significant magnitudes, the deposits show a tendency to decrease their magnitude in the last 1000 years.
 
These analyzes and their results constitute an input for the construction of knowledge in relation to the understanding of the phenomenon in tropical environments and the generation of elements that allow addressing the problem in other sectors with similar characteristics in the country.
The geomorphological analysis carried out in these watersheds enabled recognition of different levels of deposits in addition to their stratigraphic characterization. Likewise, radiocarbon dating allowed the establishment of ages between 100 +/- 30 and 2010 +/- 30 years for the different levels of deposits characterized. The integration of geomorphological and stratigraphic information along with radiocarbon dating allowed for the differentiation of the debris flow dynamics of each of the basins and suggests the existence of three phases. The first is an ancient one (with deposits older than 2000 years), followed by a sub-recent dynamic (represented by levels between 1500 and 2000 years old) and a current dynamic, with low incised deposits systems and ages that do not exceed 500 years. Finally, it was established that even though these basins have great potential for the generation of debris flow events of significant magnitude, the deposits show a tendency of decreasing magnitudes in the last 1000 years.
 
These analyses and their results are input to the construction of knowledge in relation to the understanding of this phenomenon in tropical environments and the generation of elements that would allow to address the problem in other zones with similar characteristics in throughout the country.
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Revision as of 17:44, 1 April 2018





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Comparative geomorphological analysis applied to the hazard assessment by debris flows in three watersheds of the Central Cordillera of Colombia

Ana María Pérez-Hincapié, EAFIT University Medellín , Colombia. aperez@eafit.edu.co
Marco Gamboa, EAFIT University Medellín , Colombia. mgamboa@eafit.edu.co
Geovany Bedoya, EAFIT University Medellín , Colombia. gebedoya@eafit.edu.co
Juan Felipe Paniagua-Arroyave, University of Florida Gainesville Florida, United States. jf.paniagua@ufl.edu


The watershed of the Tapartó and Farallones rivers and the La Arboleda stream in the central zone of Colombia’s western mountain range are known to have experienced important debris flow events historically. In the same manner, there is geomorphological evidence that suggests a complex dynamic associated with the conditions of high slope, heavy rainfall and a soil profile with an important development.

The geomorphological analysis carried out in these watersheds enabled recognition of different levels of deposits in addition to their stratigraphic characterization. Likewise, radiocarbon dating allowed the establishment of ages between 100 +/- 30 and 2010 +/- 30 years for the different levels of deposits characterized. The integration of geomorphological and stratigraphic information along with radiocarbon dating allowed for the differentiation of the debris flow dynamics of each of the basins and suggests the existence of three phases. The first is an ancient one (with deposits older than 2000 years), followed by a sub-recent dynamic (represented by levels between 1500 and 2000 years old) and a current dynamic, with low incised deposits systems and ages that do not exceed 500 years. Finally, it was established that even though these basins have great potential for the generation of debris flow events of significant magnitude, the deposits show a tendency of decreasing magnitudes in the last 1000 years.

These analyses and their results are input to the construction of knowledge in relation to the understanding of this phenomenon in tropical environments and the generation of elements that would allow to address the problem in other zones with similar characteristics in throughout the country.