Parameter Estimation to Penman Combination Equation in Stream Using Latent Heat Flux and Hydrometeorological Data

Recently, floods and droughts have become more frequent due to climate change and climate variability, leading to an increase in uncertainty regarding water resources management. For reliable water resources management, it is necessary to estimate available water through the water budget analysis accounting for hydrologic circulation. However, evaporation loss in the stream is not fully considered in the water budget analysis for water resources planning in South Korea. Evaporation is a critical component of the hydrological cycle that is affected by energy exchange between the water surface and the atmosphere. Therefore, we used latent heat flux data obtained from the flux tower system to quantify evaporation. This study formulated a stream evaporation formula based on PCE(Penman combination equation) equation and estimated the associated parameters in the Bayesian modeling framework that can effectively consider evaporation loss in the entire water budget analysis. We expect that this study will contribute to water management planning by adopting the regionally calibrated PCE formula in the estimation of available water more effectively.

Acknowledgement : This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT). (No. 2019R1A2C2087944)