Published

2016-05-01

Digital elevation models (DEM) used to assess soil erosion risks: a case study in Boyaca, Colombia

Modelos de elevación digital (DEM) para evaluar los riesgos de erosión del suelo: un estudio de caso en Boyacá, Colombia

DOI:

https://doi.org/10.15446/agron.colomb.v34n2.56145

Keywords:

DEM, erosion, geomorphometric, fuzzy logic (en)
DEM, erosión, geomorfometría, lógica difusa (es)

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Authors

  • Jeiner Yobany Buitrago E. Universidad Nacional de Colombia - Sede Bogotá - Faculty of Agricultural Sciences - Department of Agronomy
  • Luis Joel Martínez M. Universidad Nacional de Colombia - Sede Bogotá - Faculty of Agricultural Sciences - Department of Agronomy
The objective of this research was to develop a model for assessing the risk of erosion, exploring the potential of DEMs from SRTM, ASTER, ALOS PALSAR and one made with interpolation of a 1:25,000 contour map to calculate the variables of the relief that have greater impact on erosion. Several geomorphometric parameters, such as slope, aspect, profile and plan curvature, topographic wetness index, stream power index, and sediment transport capacity were computed from the DEM's elevation, some fuzzy logic functions proposed to evaluate the incidence of each parameter on erosion risk in a mountainous area of Colombia. The results showed that the use of DEM data is a relatively easy, uncostly method to identify, in a qualitative way, the risk of erosion and contribute to the enhancement of erosion information that is obtained with conventional general soil surveys.

El objetivo de esta investigación fue desarrollar un modelo para evaluar el riesgo de erosión, explorando el potencial de los DEM de los sistemas SRTM, ASTER, ALOS PALSAR y uno realizado por interpolación de curvas de nivel a partir de un mapa topográfico escala 1: 25.000. De la elevación de los DEM se calcularon algunos parámetros geomorfométricos como la pendiente, el aspecto, la curvatura horizontal, la curvatura vertical, índice topográfica de humedad, capacidad de transporte de sedimentos, índice de poder de los arroyos que se consideran son tiene el mayor impacto en el riesgo la erosión. Se definieron algunas funciones de lógica difusa para evaluar la incidencia de cada parámetro de riesgos de erosión en una zona montañosa de Colombia. Los resultados mostraron que el uso de datos DEM es un método relativamente fácil y de bajo costo para identificar, de una manera cualitativa, el riesgo a la erosión y contribuir a mejorar la información erosión que se consigue mediante los levantamientos generales de suelos.

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Digital elevation models (DEM) used to assess soil erosion risks: a case study in Boyaca, Colombia. (2016). Agronomía Colombiana, 34(2), 239-249. https://doi.org/10.15446/agron.colomb.v34n2.56145

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