River runoff estimation with satellite rainfall in Morocco

Hydrological assessment of different satellite precipitation products in semi-arid basins in Morocco

“…Nevertheless, the median values of bias ranged from 0.5 to 2.5 mm/day for CREST and 0.5 to 1.8 mm/day for MISDc (Additional details in the Supplementary material). The models' low performance has been observed in various studies conducted in semi-arid regions (Massari et al, 2014;Camici et al, 2018;Tramblay et al, 2023). This can be attributed to the high interannual variability of climate conditions (Bouizrou et al, 2023).…”

“…The MISDc showed good results using observed precipitation (and to some extent using PERCDR). The basins #8 and #9 gave good results in term of KGE compared to the other basins when considering observed precipitation for both hydrological models, this is likely to be due to the strong interactions between the quality of the observed discharge data in the different catchments, which can influence model calibration and validation (Tramblay et al, 2023). The KGE of the best set of parameters from the 100 sets is compared to the area of the basins for each product.…”

“…This can be explained by the fact that the large basins represented in this study are mountainous, which results in the low performance of the IMERG product. Tramblay et al (2023) tested IMERG on the same largest basins (#8 and #9) and obtained the lowest performance by this product.…”

“…They concluded that TRMM (Huffman et al, 2010), CHIRPS (Funk et al, 2015), IMERG (Hou et al, 2014) and PERSIANN CDR (Ashouri et al, 2015) are the most accurate SPPs in the Moroccan context. However, only few studies have conducted hydrological assessments of SPPs using hydrological models using different time steps, from hourly data using GPM-IMERG Early Run for flood modeling (Saouabe et al, 2020) and daily for flood modeling (Ouaba et al, 2022) and Continuous modeling of a northern basin of Morocco and 12 basins in Morocco using different SPPs (Tramblay et al, 2016(Tramblay et al, , 2023. Nonetheless, the hydrological evaluation is essential, especially in data scarce regions, to have general guidelines about which SPPs should be used for different hydrological applications.…”

“…The different hydrological applications using SPPs as input in Morocco are focused on water resources studies applied over one basin at daily time step (Tramblay et al, 2016;Camici et al, 2018;Saouabe et al, 2020;Karmouda et al, 2022;Ouaba et al, 2022) or on several basins using unevaluated satellite precipitation products against observed precipitation (Tramblay et al, 2023). This lack of hydrological applications studies using different hydrological models and SPPs, showed the need to validate hydrological simulations against observed discharge data to assess the capacity to build an operational system for water management and flood forecasting (Trigg et al, 2016).…”