Annual Variability in Evapotranspiration and Terrestrial Water Storage : Insights Obtained from Real Catchments Data
- 주제(키워드) Evapotranspiration , Terrestrial water storage , Catchment water balance
- 발행기관 고려대학교 대학원
- 지도교수 백경록
- 발행년도 2019
- 학위수여년월 2019. 8
- 유형 Text
- 학위구분 석사
- 학과 대학원 건축사회환경공학과
- 세부전공 물과 환경 전공
- 원문페이지 52 p
- 실제URI http://www.dcollection.net/handler/korea/000000084556
- UCI I804:11009-000000084556
- DOI 10.23186/korea.000000084556.11009.0000935
- 본문언어 영어
- 제출원본 000045999039
초록/요약
Water balance equation has been a fundamental problem in hy-drology. Since water balance analysis provides basic sense of available water amount in the system, it is important to quantify each components of water balance and understand their variabil-ity. In this thesis, two different partitioning issues are studied, which are 1) partitioning the loss, difference between precipita-tion and runoff, into evapotranspiration and terrestrial water stor-age change; 2) partitioning precipitation into runoff and the loss. Various data sets on evapotranspiration (GLEAM, Global ET, GLDAS NOAH) and terrestrial water storage (GRACE SH, GRACE MC, GLDAS NOAH) are investigated to understand the variability of both hydrological components in catchment scale. It is confirmed that the inter-annual variability of “the loss”, dif-ference between precipitation and runoff, is mostly due to terres-trial water storage change, and multi-year average loss follows mean annual evapotranspiration in annual water balance. It is found that the combination of Global ET and GRACE MC best describes the water balance of catchments in South Korea. In ad-dition, linear correlation between precipitation and runoff offset by the loss is validated by taking real catchment data from 14 dam catchments in South Korea and Kyushu. All the data well supports the linear correlation between precipitation and runoff. For each catchment, it is confirmed that the inter-annual variabil-ity of terrestrial water storage change mostly cause the scatter in the linear correlation between precipitation and runoff. On the other hand, evapotranspiration generates regional difference be-tween catchments. Regional variability of evapotranspiration is much higher in Kyushu than South Korea.
more목차
1 Introduction 1
2 Evaluation of evapotranspiration and terrestrial water storage products on the basis of catchment water balance 5
2.1 Introduction 5
2.2 Data sets and Study sites 7
2.3 Results and discussions 12
2.3.1 Comparison between products of E 12
2.3.2 Comparison between products of S 13
2.3.3 Evaluation of product combinations 18
2.4 Conclusions 21
3 Linear correlation between precipitation and runoff in annual water balance 22
3.1 Introduction 22
3.2 Study sites and data 24
3.3 Precipitation-runoff relation at annual time scale 26
3.4 Investigation of the variability of evapotranspiration 32
3.5 Conclusions 35
4 Summary and Conclusions 36
