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2019 Vol.52, Issue 12

Research Article

Evaluation of the behavior and quality in soil moisture data: A case study of Yongdam study watershed

토양수분 데이터의 거동 및 품질 평가: 용담시험유역 사례연구

Seulchan Leea
,
Jongjin Baikb
,
Minha Choic
,
Younghyun Chod*
이 슬찬a
,
백 종진b
,
최 민하c
,
조 영현d*
aGraduate Student, Department of Water Resources, Sungkyunkwan University
bPh.D, Center for Built Environment, Sungkyunkwan University
cProfessor, Department of Water Resources, Sungkyunkwan University
dPrincipal Researcher, Water Resources Research Center, K-water Research Institute
a성균관대학교 수자원학과 석박통합과정
b성균관대학교 에코-스마트 WaterNEXUS 창의인재양성사업팀 박사후연구원
c성균관대학교 수자원학과 부교수
dK-water연구원 물순환연구소 책임연구원
* Corresponding Author
31 December 2019. pp. 951-962
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Abstract

Producing consistent, accurate soil moisture data to be utilized as a reference dataset for researches related to hydrological cycle and natural disaster is being critical, but such techniques (e.g. quality control) are still limited to improve reliability of soil moisture data. In this study, analyses of soil moisture‘s behavior and quality control based on International Soil Moisture Network’s (ISMN’s) criteria were carried out in Yongdam study watershed, which is UNESCO-IHP’ representative examination area in South Korea, to suggest a direction to improve the quality of soil moisture data. The results of the behavior analysis showed normal increasing/decreasing patterns following precipitation events in all stations except two (i.e. Bugui, Ancheon). As a result of applying quality flagging technique, there were no observation recordings in abnormal range, and freezing of soil moisture occurred within general range (∼20%). Soil moisture rise without prior rainfall appeared about 4% and there were less than 0.01% for spike and 5% for plateau. Producing more reliable reference data will be possible if site-specific criteria for quality control are considered enough in the future.

Keywords
Yongdam study watershed
Point scale soil moisture
Behavior of soil moisture
ISMN
Quality control

최근 수문 순환 및 자연재해 관련 연구에 기초자료로 활용될 수 있도록 일관성과 정확성이 높은 토양수분 자료 생산의 필요성이 대두되고 있으나, 국내에서는 토양수분 데이터의 품질관리 기법 등 신뢰도를 확보할 수 있는 연구 개발이 부족한 실정이다. 이에 본 연구에서는 국내 UNESCO-IHP 대표 시험유역인 용담댐 유역의 토양수분 관측소 6개 지점을 대상으로 토양수분의 거동을 분석하고 International Soil Moisture Network (ISMN)의 품질관리 기법을 적용하여 토양수분 데이터의 품질을 향상시킬 수 있는 방향을 제시하고자 하였다. 거동 분석 결과 두 관측소의 경우(i.e., 부귀, 안천 관측소)를 제외한 모든 관측소에서 정상적인 토양수분 거동 형태를 보이는 것을 확인할 수 있었다. 품질관리 기법을 적용한 결과, 이상 범주에 해당되는 관측 값은 없었고, 토양수분의 동결이 일어나는 경우도 일반적인 범위(∼20%) 내에서 나타나는 것을 확인하였다. 선행 강우 없이 토양수분이 증가하는 경우 또한 ∼4% 이내로 나타났으며, spike의 경우 0.01%, plateau의 경우 ∼5% 수준으로 선별되어 매우 양호한 결과를 확인할 수 있었다. 추후 관측소별 토양 특성이 고려된 Site-specific한 품질관리 기준이 마련된다면, 보다 신뢰도 높은 토양수분 기초자료의 생산을 가능케 할 것으로 기대된다.

키워드
용담시험유역
점 관측 토양수분
토양수분의 거동
ISMN
품질관리 기법
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 52
  • No :12
  • Pages :951-962
  • Received Date : 2019-10-07
  • Revised Date : 2019-11-15
  • Accepted Date : 2019-11-15
  • DOI :https://doi.org/10.3741/JKWRA.2019.52.12.951
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