I Congreso de Postgrado fcfm: ingeniería, ciencias e innovación

182 Santiago, 10 al 12 de agosto, 2022 THE BENEFITS OF REMOTELY SENSED OBSERVATIONS FOR THE REALISM OF DISTRIBUTED HYDROLOGICAL MODELS IN MOUNTAINOUS CATCHMENTS Vásquez, Nicolás¹*, Cortés-Salazar, Nicolás¹, Mizukami, Naoki², Mendoza, Pablo A. 1,3 ¹Department of Civil Engineering, Universidad de Chile, Chile. ²National Center for Atmospheric Research (NCAR). ³Advanced Mining Technology Center (AMTC), Universidad de Chile, Chile. *Email: nicolas.vasquez.pl@uchile.cl ABSTRACT Over the past decades, remote sensing products have contributed with additional information on various com - ponents of the water cycle, especially in sparsely monitored areas. Although including spatial patterns derived from satellite products can improve the performance of distributed hydrological models, simulating streamf low at interior points remains a challenge. In this study, we characterize the added value of incorporating remote- ly sensed soil moisture, fractional snow covered area, evapotranspiration and land surface temperature in the calibration of a distributed hydrological model. To this end, we configure the variable infiltration capacity (VIC; Liang et al., 1994) model at a 0.05°x0.05° horizontal resolution, coupled with the mizuRoute model (Mizukami et al., 2016) in a catchment located in Southern Chile. We conduct calibration experiments with only streamf low data, and combining streamf low with remotely sensed spatial patterns. Specifically, we examine: (i) the effects at interior “ungauged” points, (ii) the benefits of including additional variables, and (iii) the benefits of adding gauging points in the calibration process. Our results suggest that incorporating information from remote sens - ing products improves the overall performance of the simulations, and also at interior ungauged points. Similarly, including spatial patterns is as good as including more streamf low gauges, with lower variance among the best parameters sets for each configuration. Furthermore, and as expected, when including more variables, the model performance for these variables increases. However, not all the aspect of the variables improves. ACKNOWLEDGMENT • The authors acknowledge the fundings from the Fondecyt Project N°11200142 • "Powered@NLHPC: This research/thesis was partially supported by the supercomputing infrastructure of the NLHPC (ECM-02)" REFERENCES Liang, X., Lettenmaier, D. P., Wood, E. F., & Burges, S. J. (1994). A simple hydrologically based model of land surface water and energy f luxes for general circulation models. Journal of Geophysical Research . https://doi. org/10.1029/94jd00483 Mizukami, N., Cla rk, M. P., Sampson, K., Nijssen, B., Mao, Y., Mc Millan, H., et al. (2016). mizuRoute version 1: a river network routing tool for a continental domain water resou rces applications. Geoscientific Model Development, 9(6), 2223–2238. https://doi.org/10.5194/gmd-9-2223-2016 R E CU R SOS H Í D R I COS 16