Efectos de las fuentes cartográficas en los resultados de la modelación hidráulica de crecidas

A. Casas Planes, Gerardo Benito Ferrández, Varyl R. Thorndycraft, M. Rico

Resumen

En este trabajo se ha analizado el efecto de la cartografía en los resultados derivados de los modelos hidráulicos. Se han creado siete modelos de elevaciones del terreno (MDT) desarrollados a partir de tres fuentes cartográficas diferentes: un levantamiento por posicionamiento global GPS, un modelo digital de elevaciones a partir de datos altimétricos de alta resolución LiDAR (Light Detection And Ranging) y una cartografía vectorial de curvas de nivel. Los modelos cartográficos de partida han sido analizados y los resultados del modelo hidráulico se evaluaron en tres contextos diferentes: 1) los propios resultados del modelo: relación caudal-altura de la lámina de agua, 2) la sensibilidad relativa del modelo hidráulico a cambios en el parámetro de resistencia al flujo según el modelo cartográfico utilizado y 3) la delineación del área de inundación. Los cálculos hidráulicos se han basado en un modelo unidimensional (HEC-RAS). El trabajo demuestra la importancia de los modelos cartográficos, al obtener variaciones de 4.5 m en la determinación de la altura de la lámina de agua y de un 50% en la estimación del área inundada para las mismas condiciones de contorno.

Palabras clave

Modelo Hidráulico; GPS; Batimetría; SIG; LIDAR; MDT; Río Ter; HEC-RAS

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