KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Capability of Evapotranspiration Estimation with Short Field Data

자료가 빈약한 지역에서의 증발산량 산정 가능성

Oh, Nam-Sun;Lee, Khil-Ha;Ko, Young-Chan
오남선;이길하;고영찬

  • Published : 2002.11.30

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Abstract

This paper presents the application of the different methods to evaluate the evapotranspiration. A high degree of accuracy in calculating potential evaporation might not be possible since various assumptions and simplifications of model inputs were required due to the limited nature of the input data. Some methods presented here is, however, encouraging in that they are feasible in the area in which many parameters required as input have measured in no field experiments. First, evapotranspiration is evaluated by a physically-based Soil-Vegetation Atmosphere Transfer Scheme (SVATS), and next, comparatively simple semi-empirical methods are utilized to evaluate evapotranspiration. Both are compared with a field experimental data. The results shows a tolerable accuracy and Hargreaves equation is very encouraging because of it's less requirement of input parameters. In the following, it is expected to contribute to the effective and consistent management of the water resources.

이 연구에서는 네 가지의 방법을 이용하여 증발산량을 산정하고 이를 비교하였다. 증발산량의 산정은 많은 가정과 자료의 제약으로 정확한 산정이 어렵다. 물리적 이론을 바탕으로 한 Soil-Vegetation Atmosphere Transfer Scheme(SVATS)에 의하여 증발산량을 계산하였으며, 이에 비하여 상대적으로 간단한 반경험식 들을 이용하여 증발산량을 계산하여 현장 측정자료와 비교되었다. 반경험식으로는 Penman 공식, Priestly-Taylor 공식 그리고 Hargreaves 공식을 이용하였으며, 모든 결과가 적절한 범위의 정확도를 가지고 있는 것으로 나타났다. 각각의 방법들은 서로 다른 입력자료를 필요로 하기 때문에 실제 사용에 있어서는 이에 대한 고려가 필요할 것이다. 특히 우리나라와 같이 입력자료가 풍부하지 않은 지역에서는 Hargreaves공식과 같이 적은 입력자료가 필요하고 상대적으로 간단한 증발산량 공식을 이용할 수 있다 향후 실제 우리나라의 입력자료를 이용한 연구와 검증이 필요할 것이다.

Keywords

References

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