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Geosciences 2018, 8(8), 300; https://doi.org/10.3390/geosciences8080300

Improving Flood Maps in Ungauged Fluvial Basins with Dendrogeomorphological Data. An Example from the Caldera de Taburiente National Park (Canary Islands, Spain)

1
Department of Geodynamics, Complutense University of Madrid, E-28040 Madrid, Spain
2
Geological Survey of Spain (IGME), Ríos Rosas 23, E-28003 Madrid, Spain
3
Forest Engineering Technic School, Technic University of Madrid, E-28040 Madrid, Spain
4
Mining and Geological Engineering Department, University of Castilla-La Mancha, E-45071 Toledo, Spain
5
Institute of Oceanography and Global Change, University of Las Palmas de Gran Canaria, E-35003 Las Palmas de Gran Canaria, Spain
*
Author to whom correspondence should be addressed.
Received: 28 June 2018 / Revised: 3 August 2018 / Accepted: 7 August 2018 / Published: 10 August 2018
(This article belongs to the Section Natural Hazards)
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Abstract

Flash floods represent one of the more usual natural hazards in mountain basins, and, combined with the lack of reliable flow data and the recreational use of the drainage basin by tourists and hikers, there is a significant risk of catastrophe. Here, we present a dendro-geomorphological reconstruction of a past flash flood event in the Caldera de Taburiente N.P. (Canary Islands, Spain), an ungauged drainage basin in the SW side of the volcanic island of La Palma. We couple two-dimensional hydraulic modelling in a highly-resolved topographic environment (LiDAR data) with (1) peak flow data for various Tyear return periods from an uncalibrated hydrological model and (2) a data set of scars on trees, to investigate the magnitude of a 1997 dated flash-flood. From the results, flood hazards and associated risks would be clearly underestimated by using only the unique available hydrological data (a rainfall gauge station downstream of the study area). Hydraulic models using scars data show a higher flood hazard scenario, improving the flood hazard map by using all available flood evidence. Moreover, all this will allow for better implementation of appropriate adaptation policies by National Park managers, and therefore the mitigation of future disasters. View Full-Text
Keywords: flood hazard; ungauged basin; Dendro-geomorphological data; 2D hydraulic model; Canary Islands flood hazard; ungauged basin; Dendro-geomorphological data; 2D hydraulic model; Canary Islands
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Garrote, J.; Díez-Herrero, A.; Génova, M.; Bodoque, J.M.; Perucha, M.A.; Mayer, P.L. Improving Flood Maps in Ungauged Fluvial Basins with Dendrogeomorphological Data. An Example from the Caldera de Taburiente National Park (Canary Islands, Spain). Geosciences 2018, 8, 300.

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