4.7 Article

Analysis of two sources of variability of basin outflow hydrographs computed with the 2D shallow water model Iber: Digital Terrain Model and unstructured mesh size

Journal

JOURNAL OF HYDROLOGY
Volume 612, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.jhydrol.2022.128182

Keywords

SRTM; IGN; Digital elevation model; Iber; Mesh size; Runoff

Funding

  1. Min?o-Sil River Basin Management Au-thority (CHMS)
  2. Xunta de Galicia [ED481B-2021-108]
  3. Conselleria de Cultura, Educacion e Universidade [ED431C 2021/44, ED431C 2018/56]
  4. European Regional Development Fund [0034_RISC_ML_6_E]
  5. Universidade da Coruna/CISUG

Ask authors/readers for more resources

This study examines the influence of Digital Terrain Model (DTM) accuracy and resolution on the results and runtime of a hydrological model. The results suggest a correlation between the vertical accuracy of the DTM and its horizontal resolution.
Modelling hydrological processes with fully distributed models based on the shallow water equations implies a high computational cost, which often limits the resolution of the computational mesh. Therefore, in practice, modellers need to find a compromise between spatial resolution, numerical accuracy and computational cost. Moreover, this balance is probably related to the accuracy and resolution of the underlying Digital Terrain Model (DTM). In this work, it is studied the effect of the DTM resolution and the size of the computational mesh on the results and on the runtime of a hydrological model based on the 2D shallow water equations. Seven rainfall events in four different basins have been modelled using 3 DTMs and 3 different mesh resolutions. The results obtained highlight the relevance of the vertical accuracy versus the horizontal resolution of the DTMs. Furthermore, it has been observed that mesh resolutions greater than 25 m, together with LiDAR-based DTMs with horizontal resolution greater than 25 m, provide comparable outflow hydrographs.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available