Effects of digital elevation model (DEM) spatial resolution on the parameters of semi-distributed hydrological model

Resumen

This study assesses the effect of digital elevation models (DEM) resolution in the parameter value estimation of a semi-distributed hydrological model. The selected hydrological model is TOPMODEL, which is a physical and topographically based model. Four Colombian basins, from different regions and with several hydro-climatic regimes, were delineated using six DEM resolutions; from them, the topographic inputs into the hydrological model were assessed. The climatic inputs came from CHIPRSv2 (precipitation fields), and ERA5 (potential evapotranspiration fields). The hydrological model parameters were calibrated for each DEM, and a Principal Components Analysis (PCA) and Random Forest were made to find relations between the parameters and DEM resolution, The results show no evident effects of the DEM resolution on the TOPMODEL parameters. But the prediction of some of the TOPMODEL parameters using characteristics of topographic and morphometric, by random forest model can be done.

Fecha de lectura	01 ago. 2023
Idioma original	Inglés
Institución de lectura	Pontificia Universidad Javeriana