Presenter: Prof. Boosik KANG, Dankook University
Co-author(s): Miss. Eunji KIM, K-wate
Sub-theme
6. Innovation for Water Governance and Management
Topic
6-8. Creative technology and tools for water resources management
Body
Evapotranspiration is an essential factor in preparing in planning efficient water management through the estimation of water loss. It is an energy exchange process that occurs between the atmosphere and the surface of land or water, and it is difficult to measure the absolute amount of evapotranspiration that actually occurs at a specific area. In particular, in terms of the hydrologic cycle, there are technical limitations in estimating areal evapotranspiration occurring in a watershed. The objective of this study is to validate the Complementary Relationship of areal Evapotranspiration (CRE) of the Yongdam dam basin based on the evapotranspiration data from multiple sources. The Yongdam Dam basin, located upstream of the Geum river basin, which is the third largest in South Korea, has been designated as a test-bed for the development of advanced water manage technologies and various equipment such as the flux tower are operated to provide hydrometeorological data. The data used to verify the CRE hypothesis were evapotranspiration flux as actual evapotranspiration (AET), pan evaporation as potential evapotranspiration (PET), and surface evaporation of reservoir as wet evapotranspiration (WET). The observation period of the data is from 2011 to 2020, and the evapotranspiration data during the winter period (December to February), when the temperature continues below freezing, were excluded from the analysis due to the low reliability of the data quality. The CRE of the Yongdam dam basin based on the observed evapotranspiration data has an asymmetry relationship. The ratio of AET to PET is 1:1.3, and the coefficient of determination (R2) is 0.6273, which indicates that the relationship between the observed data and the CRE hypothesis is acceptable. If the CRE of based on observed evapotranspiration data is identified, it is expected that it will be possible to establish a water resources plan that the considered the amount of water loss due to evapotranspiration only with limited data from unmeasured basins.