Browsing by Author "Pacheco Nivelo, Jheimy Lorena"

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Evaluación de productos satélite de precipitación y temperatura para la determinación de caudales en la cuenca alta del río Paute
(Universidad de Cuenca, 2023-07-24) Guamán Mendoza, Anthony Esteban; Lema Zúñiga, Carlos Josué; Avilés Añazco, Alex Manuel; Zhiña Villa, Darío Xavier; Pacheco Nivelo, Jheimy Lorena
The research focused on evaluating different satellite products (SP) of precipitation (SPP) and temperature (SPT) for hydrological modeling processes and estimating flows in the upper area of the Paute river basin, which contemplate the sub-basins; Tomebamba, Tarqui and Yanuncay. The SP were collected on a daily time scale, then PS were filtered based on the utility for the study area. As a result, the products selected were ERA5-LAND as SPT and CHIRPS, IMERG, PERSIANN-CCS, PERSIANN-CCS-CDR, PDIRNOW, ERA5-LAND and MSWEP as SPP. The observed hydrometeorological data were obtained from gauge network with 8 stations (five for precipitation data, two for temperature data and three for river discharge data) on a daily scale provided by ETAPA-EP. Initially, these SP data were used for a statistical validation and the results indicated that; the SP with the best approximation to reality are MSWEP and ERA5-LAND, followed by the PERSIANN products and IMERG. Subsequently, the simulation of the flow for each sub-basin was carried out in the HBV-LIGHT software using each SP. In addition, the automatic calibration was based on Monte Carlo and GAP simulations. Results showed low efficiencies, due to different considerations such as; SP re-analysis, HBV-LIGHT structure, evapotranspiration and the availability of observed data. Finally, it is proposed for future research work to improve the quality of SP and ground stations through; downscaling, spatial interpolation, integration of multiple meteorological networks and use of other hydrological models that are mostly specialized in the region.
Sensitivity exploration of water balance in scenarios of future changes: a case study in an andean regulated river basin
(2020) Avilés Añazco, Alex Manuel; Palacios Garate, Karina Fernanda; Pacheco Nivelo, Jheimy Lorena; Jimenez Yucta, Stalin Daniel; Zhiña Villa, Dario Xavier; Delgado Inga, Victor Omar
Effects of climate change on water resources availability have been studied extensively; however, few studies have explored the sensitivity of water to several factors of change. This study aimed to explore the sensitive of water balance in water resources systems due to future changes of climate, land use and water use. Dynamical and statistical downscaling were applied to four global climate models for the projections of precipitation and temperature of two climate scenarios RCP 4.5 and RCP 8.5. Land use projections were carried out through a combination of Markov chains and cellular automata methods. These projections were introduced in a hydrologic model for future water supply evaluation, and its interactions with water use projections derived from a statistical analysis which served to assessment deficits and surplus in water to 2050. This approach was applied in the Machángara river basin located in the Ecuadorian southern Andes. Results showed that the water supply exceeds the water demand in most scenarios; however, taking into account the seasonality, there were months like August and January that would have significant water deficit in joint scenarios in the future. These results could be useful for planners formulating actions to achieve water security for future generations.