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NTIS 바로가기Journal of Korea Water Resources Association = 한국수자원학회논문집, v.51 no.5, 2018년, pp.425 - 438
김상욱 (강원대학교 공과대학 토목공학과) , 이철응 (강원대학교 공과대학 토목공학과)
Existing studies that analyze the causes and effects of water circulation use mostly rainfall - runoff models, which requires much effort in model development, calibration and verification. In this study, hydrological sensitivity analysis which can separate quantitatively the impacts by natural fact...
핵심어 | 질문 | 논문에서 추출한 답변 |
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모수적 검정이란? | 관측된 시계열 자료에 있어서 특정 시점을 전후로 모집단의 평균 및 분산 특성이 동일한지의 여부를 규명하기 위해서는 통계학적 가설 검정(statistical hypothesis test)이 활용될 수 있으며, 통계학적 가설은 모수적 검정(parametric test)과비모수적 검정(non-parametric test)으로 구분된다. 모수적 검정은 모집단의 통계적 특성이 정규분포 등의 특정 분포를 따른다는 가정이 활용됨에 따라 이 같은 가정이 만족되지 않는 경우 검정력의 신뢰성이 감소될 수 있는 단점이 있으나 두 모집단의 평균 및 분산특성을 규명함에 있어 가장 기본적으로 사용될 수 있는 기법이다. | |
통계학적 가설 검정 진행은 어떻게 되는가? | 두 모집단의 평균에 대한 통계학적 가설 검정은 주로 두 모집단의 평균의 차이가 통계적으로 유의한지의 여부를 검정하게 되며, 이를 위해서는 두 모집단의 분산인 1과 2에 대한정보수집의 유무와 관측값 크기의 대 ․ 소여부에 따라 검정을 위한 분포 및 검정절차의 선택이 결정된다. 즉 대표본(일반적으로 자료개수가 30 이상)인 경우 two sample Z-test를, 소표본(일반적으로 자료개수가 30 미만)인 경우 two sample t-test를 사용하며, 모집단의 분산을 모르는 경우는 표본 표준편차를 이용한 검정절차를 진행하게 된다. | |
유량 또는 댐유입량는 무엇에 의해 변동되는가? | 특정 지점에서 관측된 유량 또는 댐유입량 자료는 관측된 상류지점에서의 강수, 온도, 증발산 등의 자연적 요인(natural factor)과 토지이용도의 변화, 댐 건설, 취수 등의 인위적 요인(anthropogenic factor)이 총체적으로 반영된 자료로 시간에 따라 변동된다. 수문순환에 영향을 미치는 요인을 분석하기 위한 기존 연구는 주로 수문학적 요인들과 자연적 요인 및 인위적 요인들 사이의 관계를 규명하는 데 초점을 두고 진행되었다(Pike 1964; Nash and Gleick 1991; Burn 1994). |
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