• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2023년도 학술발표회
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• pp.119-119
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• 2023

본 연구에서는 Terra MODIS(MODerate resolution Imaging Spectroradiometer) 위성영상과 토양수분 부족지수(Soil Water Deficit Index, SWDI)를 이용하여 2012년부터 2022년까지 한반도 전국의 1km 공간 증발산량을 산정하였다. 공간 증발산량을 산정하기 위한 과정은 크게 두 가지로 구분된다. 첫 번째로 MODIS의 LST(Land Surface Temperature), NDVI(Normalized Difference Vegetation Index), 선행강우 및 무강우 누적일수를 이용해 1 km 공간 토양수분을 산정하였다. 농촌진흥청 토양수분관측망 자료 중 토지피복, 토양 속성을 고려하여 선정된 70개소 토양수분 실측데이터와 비교한 결과 지점별 평균 R² 0.63~0.90으로 유의미한 상관성을 나타내었다. 산정된 공간 토양수분은 생장저해수분점과 초기위조점의 관계를 이용한 SWDI로 변환하였다. 두 번째로 순 복사량, 기온 및 NDVI의 적은 수문인자를 통해 증발산량 산정이 가능한 MS-PT(Modified Satellite-based Priestley-Taylor) 모형을 기반으로 계절별 식생과 토양수분 상태를 고려하여 1 km 공간 증발산량을 산정하였다. MS-PT 모형에서 가정한 대기 증발 변수 Diurnal temperature (DT)와 지표 수분의 상관성 문제를 해결하기 위해 DT를 SWDI로 적용하였다. 모형 결과의 검증을 위해 국내 플럭스 타워 (설마천, 청미천, 덕유산) 증발산량 관측자료와의 결정계수(Coefficient of determination, R²), RMSE(Root Mean Square Error) 및 IOA(Index of Agreement)를 산정하였다. 본 연구의 결과로 생산되는 국내 증발산량의 시, 공간적 변동성은 증발산량을 통한 수문학적 가뭄지수 및 급성 가뭄을 파악하는데 활용될 수 있을 것으로 판단된다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.7-9
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• 2004

The purpose of this study was to analyze the climatic water balance of the Korean peninsula using meteorological data and the evapotranspiration (ET) derived from NOAA/AVHRR. Quantifying water balance components is important to understand the basic hydrology. In this study, a simple method to estimate the ET was proposed based on a regression approach between NDVI and Morton's actual ET using NOAA/AVHRR data. The Morton's actual ET for land surface conditions was evaluated using a daily meteorological data from 77 weather stations, and the monthly averaged Morton's ETs for each land cover was compared with the monthly NDVIs during the year 2001. According to the climatic water balance analysis, water deficit and surplus distributed maps were created from spatial rainfall, soil moisture, and actual and potential ETs map. The results clearly showed that the temporal and spatial characteristics of dryness and wetness may be detected and mapped based on the wetness index.

• 한국농공학회논문집
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• 제47권1호
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• pp.3-9
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• 2005

The purpose of this study was to analyze the climatic water balance of the Korean peninsula using meteorological data and the evapotranspiration (ET) derived from NOAA/AVHRR, Quantifying water balance components is important to understand the basic hydrology, In this study, a simple method to estimate actual ET was proposed based on a regression approach between NDVI and Morton's actual ET using NOAA/AVHRR data, The Mortons actual ET for land surface conditions was evaluated using a daily meteorological data from 77 weather stations, and the monthly averaged Morton's ETs for each land cover was compared with the monthly NDVIs during the year 2001. According to the climatic water balance analysis, water deficit and surplus distributed maps were created from spatial rainfall, soil moisture, and actual and potential ETs map, The results clearly showed that the temporal and spatial characteristics of dryness and wetness may be detected and mapped based on the wetness index.

• Journal of Forest and Environmental Science
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• 제21권1호
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• pp.92-97
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• 2005

1. 상엽의 기공증산속도는 광도가 증가함에 따라 계속적인 증가를 나타냈지만, 중엽과 하엽은 광도 약 $100{\mu}mol\;m^{-2}S^{-1}$ 이상에서 기공증산의 포화가 나타났다. 포화광도 $1,200{\mu}mol\;m^{-2}S^{-1}$)에서 기공증산은 상엽($1.29mmol\;H_2O\;m^{-2}S^{-1}$) > 중엽($0.56mmol\;H_2O\;m^{-2}S^{-1}$) > 하엽($0.31mmol\;H_2O\;m^{-2}S^{-1}$)순위였다. 2. 엽의 수분이용효율은 광도 $600{\mu}mol\;m^{-2}S^{-1}$ 까지 빠르게 증가하다가 그 이상의 광도에서는 감소한 반면, 중엽과 하엽은 광도 $400{\mu}mol\;m^{-2}S^{-1}$ 까지는 증가하였지만 그 이상의 광도에서는 증가를 보이지 않았다. 3. 엽의 광도증가에 따른 수증기압결핍은 직선적으로 감소하는 경향을 나타냈다.

• 생물환경조절학회지
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• 제31권2호
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• pp.125-132
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• 2022

본 연구는 유럽계 장과형과 중과형 오이 품종을 고온·다습 조건에서 재배하여 품종별 생육과 수량 특성 및 수분소모량을 비교 분석하여 중과형 오이 품종에 대해 사막기후 적용 가능성을 검토하고자 수행되었다. 유럽형 장과종 오이 2품종(Cucumis sativus 'Gulfstream', 'Imea')과 중과종 오이 2품종(C. sativus 'Nagene', 'Sausan')을 연동형 플라스틱온실에서 2020년 3월 2일부터 6월 20일까지 코이어 수경재배로 재배하였다. 개체당 생산한 상품과수는 장과종 'Gulfstream'이 31.3개, 'Imea'가 30.7개, 중과종 'Nagene'이 57.8개, 'Sausan'이 56개로 마디수가 더 많았던 중과종이 상품과수가 더 많았으며 개체당 생산된 총상품과중은 유의차가 없었다. 과실 200g을 생산하기 위해 소요된 물량은 'Nagene'이 2.39L로 가장 적었으며, 수분이용이용효율(WUE)은 'Nagene' 품종이 가장 높았다. 따라서, 상품과수와 물소비량을 고려할때 장과종보다는 중과종인 'Nagene'이 사막 고온 적응성이 더높을 것으로 판단되고 앞으로 더 많은 중과종 품종에 대한 검증이 필요할 것으로 보인다.

• 한국주거학회논문집
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• 제16권1호
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• pp.27-35
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• 2005

It has seen the significant increase of water consumption rate due to rapid industrialization, high-densities of city, and increasing the population; thereby leads further water resource required in near future. In order to solve this deficit there are one of solution that gray water method demonstrates advantages regarding the questions of optimal water utility and thereby master plan of water. The method of study is analysis of investigation data through interview and research of sewage treatment plants in Daegu City. Through these analysis, this paper examines the capacity of graywater and optimal graywater facility.

• 한국자원식물학회지
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• 제12권1호
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• pp.10-19
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• 1999

The water status of Pinus densiflora and P. koraiensis was observed after the treatment of simulated acid rain for every month August 1997 to March 1998. Both of the species showed increase of dry weight, water saturation deficit and epidermis transpiration after treatment of simulated acid rain (pH 3.5) for first three months. On the contrary, water content was decreased in both the species after three month of simulated acid rain treatment. The effect of simulated acid rain, however, became weaker after that and no big difference was observed after seven month of treatment. Water potential of the leaf of both species became lower than that of the control(pH 5.6) after seven month treatment of simulated acid rain. The cuticle layers of the epidermis and florins ring were damaged seriously and the size of the gap between stomata became bigger after the treatment of simulated acid rain.

• 농촌계획
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• 제9권2호
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• pp.29-37
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• 2003

The objectives of this study are to develop an agricultural drought evaluation model based on administrative boundaries and to assist the effective drought-related decision-making of local governments. The model which was named ADEM(Administrative Drought Evaluation Model for Paddies) is designed to simulate daily water balance between available water quantities from various agricultural water facilities such as reservoirs, wells, pump stations, etc. and water requirements in paddies. And in order to numerically describe the agricultural drought severity, two indices were defined; One is ADFP(Agricultural Drought Frequency for Paddies) which is calculated with a frequency analysis of monthly water deficit, and the other is ADIP(Agricultural Drought Index for Paddies) with a scale of $-4.2{\sim}+4.2$. The developed model was applied to Yeoju district and showed good correspondence with the historical records of drought.

• 한국자원식물학회지
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• 제13권2호
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• pp.131-139
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• 2000

The effects of the simulated acid rain on the growth response and water status of Glycine soja was observed in 2 months-old seedlings. The seedlings were treated with acid rain(pH 3.5), three times per week. Glycine soja showed significant reduction in the total length, total weight, dry weight, water contents and top/root ratio after treatment of simulated acid rain(pH 3.5) for 56 days. The growth of shoot was more susceptible to acid rain than that of roots. On the contray, Number of lateral roots, water saturation deficit and epidermis transpiration was higher than that of control(pH 5.6) after 56 days treatment of simulated acid rain.

• 한국조경학회지
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• 제27권1호
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• pp.122-131
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• 1999

Indoor environments are usually less than optimal for the growth of ferns, especially in regards to the water condition. These studies were performed to investigate responses involved in causing growth of ferns and presume management plan against the water deficit under indoor conditions. The effect of air humidity and soil moisture on the ferns was examined in Adiantume raddianum and Selaginella kraussiana. Results of experiments are as follows; 1. Under a low humidity condition, having a 25-50% RH. ornamental value of ferns decreased much more than under a 90% RH. Under a low soil moisture, such as sand treatment, ornamental value of ferns also decreased. 2. Leaf chlorophyll content, water content and stomata situations increased as air humidity and soil moisture went up. 3. Even if air humidity and soil water were not enough for ferns growth, the extending of irrigation cycle was helpful. 4. Under extremely low air humidity conditions, some water management, namely, using water holding soil or extending of irrigation cycle was desirable. Other methods of increasing air humidity, including water instruments such as ornamental pools, waterfalls, or fountains, grouping plants together were also helpful. But spraying water on leaves increased injury to ferns growth because of excess evaporation from the leaves. Though these studies, we learn that ferns are susceptible to water condition such as air humidity, soil water and water management. If other environmental factos are maintained with optimal conditions, water condition plays an important role in ferns growth in indoor environments.