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NTIS 바로가기한국물환경학회지 = Journal of Korean Society on Water Environment, v.31 no.3, 2015년, pp.272 - 285
이혁 (국립환경과학원 물환경평가연구과) , 강태구 (국립환경과학원 물환경평가연구과) , 남기범 (국립환경과학원 물환경평가연구과) , 하림 (국립환경과학원 물환경평가연구과) , 조경화 (울산과학기술대학교 도시환경공학부)
Accurate assessment of chlorophyll-a (Chl-a) concentrations in inland waters using remote sensing is challenging due to the optical complexity of case 2 waters. and the inherent optical properties (IOPs) of natural waters are the most significant factors affecting light propagation within water colu...
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핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
원격탐사 기법은 어떤 요소에 기초를 두고 있는가? | 수체를 구성하는 물질의 농도를 원격탐사 기법을 이용해 추정하기 위한 많은 방법들은 기본적으로 원격반사도(Rrs(λ))와 흡수(a(λ)), 산란(bb(λ))과 같은 고유광특성 (Inherent Optical Properties, IOPs - 편의를 위해 본 논문에서 사용된 기호 및 약어표를 부록에 제시하였다)의 상호관계에 기초를 두고 있다(Gordon et al., 1988). | |
분광복사계는 어떤 역할을 하는가? | 한편, 현장에서 사용되는 분광복사계는 수체의 광학적 특성들을 바탕으로 반사율 함수를 이용하여 광자들의 감쇠량을 측정한다. 복사량과 반사율과 같은 이러한 측정값들을 외재적 광특성(Apparent Optical Properties, AOPs)이라고하며, 빛의 흡수와 산란과 같은 IOPs의 함수로 표현된다. | |
왜 내해에서 조류에 의한 흡수계수인 achla를 추정하기 어려운가? | 물과 조류에 의한 흡수가 지배적인 외해에서는 전통적으로 Chl-a 농도 추정을 위해 청색과 녹색파장을 이용해왔다(Gordon and Morel, 1983; Morel and Prieur, 1997). 하지만 각종 부유물질로 인해 탁도가 상대적으로 높은 내륙 수체에서는 용존유기물(Colored Dissolved Organic Matter, CDOM)과 조류 이외의 입자성물질(Non-Algal Particles, NAP)에 의한 흡수영향과 Chl-a 농도와 스펙트럼 간의 비선형성 및 중첩성으로 인해 청색 및 녹색 파장을 이용해 Chl-a 농도를 추정하기 어려운 상황이다(Dall’Olmo et al., 2003; Gitelson, 1992; Gitelson et al. |
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