• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.1412-1412
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• 2003

• 한국수자원학회논문집
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• 제52권6호
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• pp.381-395
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• 2019

본 연구의 목적은 농업용 저수지 저수율 예측을 위해 개발된 회귀식에 미래 기후변화 시나리오 및 3개월 기반의 농업용 저수지 저수율 자료 및 기상자료를 이용하여 미래 저수율을 예측하는 것이다. 예측된 저수율을 3개월 자료기반의 저수지 가뭄지수로 지수화하여 가뭄 지속기간, 심도 및 규모를 산정하고 미래 가뭄을 평가하였다. 극한사상의 추정을 위해 6개의 RCP 8.5 기후변화 시나리오(HadGEM2-ES, CESM1-BGC, MPI-ESM-MR, INM-CM4, FGOALS-s2, and HadGEM3-RA)를 3개의 미래 평가기간(S1: 2011~2040, S2: 2041~2070, S3: 2071~2099)으로 구분하여 미래 저수율을 산정하였다. 산정 결과, 강수량 및 기온의 상승이 가장 큰 HadGEM2-ES 시나리오에서의 미래 저수율이 6개의 시나리오 중 S3 기간에 평년 저수율(1976~2005 기간, 77.3%)보다 가장 큰 폭으로 감소한 60.2%로 나타났다. 강수량 및 기온의 상승이 가장 적은 INM-CM4 시나리오의 저수율은 S3에서 72.8%로 가장 적게 감소했으며, CESM1-BGC, MPI-ESM-MR, FGOALS-s2, 및 HadGEM3-RA 시나리오에서 S3 구간 미래저수율은 각각 72.6%, 72.6%, 67.4%, 64.5%로 감소하였다. 미래 저수율을 이용해 RDI를 산정하고 절단수준 -0.25 이하의 심한 가뭄 경향성이 S3 기간으로 갈수록 빈번하게 나타나며 심도가 -2.0까지 나타났다.

• 한국농공학회논문집
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• 제48권2호
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• pp.37-43
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• 2006

A hydrological drought index, MSWSI (Modified Surface Water Supply Index) was suggested based on SWSI (Surface Water Supply Index). With the available data of spatially distributed observation station of precipitation, dam storage, stream water level and natural groundwater level, South Korea was divided into 32 regions. This was conducted to represent the calculated index as a spatially distributed information. Monthly MSWSI was evaluated for the period of 1974 and 2001. It is necessary to compare this result with PDSI (Palmer Drought Severity Index) and SPI (Standard Precipitation Index), and check the applicability of the suggested index in our hydrological drought situation.

• 한국습지학회지
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• 제8권1호
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• pp.49-58
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• 2006

가뭄은 인간이 극복하기 힘든 자연재해로 시간규모가 다양하고 누적된 효과가 천천히 나타나기 때문에 인지가 어려우며 이로 인해 피해가 커지는 경향이 있다(최영진, 1995). 가뭄에 적절히 대처하기 위해서는 가뭄의 감시(Monitoring) 체계가 필요하고, 객관적이고 널리 적용될 수 있는 가뭄의 정의와 가뭄의 정도를 정량적으로 나타낼 수 있는 지표가 필요하다. 기상학 및 수자원에서는 가뭄 감시를 위해 현 상태에 대한 정량적인 가뭄심도를 나타내는 가뭄지수를 사용하고 있으며 원격탐사 분야에서는 다중시기의 식생지수 및 지표면 열지수 등을 활용하여 가뭄여부를 판단하는 노력을 수행하고 있다. 본 연구에서는 과거 10년간 남한의 가뭄시점에 대한 가뭄지수 분석을 통하여 가뭄의 심도를 파악하였고, 정규식생지수(NDVI)와 식생상태지수(VCI)를 활용하여 가뭄현황을 판별하였다. 또한, 식생지수와 가뭄지수의 상관성분석을 통하여 식생지수를 이용한 정량적인 가뭄분석의 가능성을 모색하였다.

• 한국농공학회논문집
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• 제61권3호
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• pp.77-88
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• 2019

Drought is the recurrent natural disasters which harshly affect agricultural production and society in various parts in Bangladesh. Information on the spatiotemporal variability of drought events plays a vital role to take necessary action towards drought mitigation and sustainable development. This study aims to analyze the spatial and temporal variation of meteorological drought in Bangladesh during 1981-2015 using Effective Drought Index (EDI). Monthly precipitation data for 36 years (1980-2015) were obtained from 27 meteorological stations. Drought frequency (DF) and areal extent of drought were considered to investigate the spatiotemporal structure of drought. The DF analysis showed that the northern, southwestern and central regions of the country are comparatively vulnerable to meteorological drought. The frequency of drought in all categories has considerably increased during the recent five years from 2011 to 2015. Furthermore, the most significant increasing trend of the drought-affected area was found over the central region especially for pre-monsoon (March-May) season during this period while the decreasing trend of the affected area was found within the eastern region during the study period. To prevent and mitigate the damages of drought disasters in Bangladesh, agricultural and government managers should pay more attention to those regional drought events that occur in pre-monsoon season. The outcome of the present study can be used as explanatory data in building the strategies to drought monitoring and mitigation activities in Bangladesh.

• 한국농공학회논문집
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• 제61권3호
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• pp.1-14
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• 2019

North Korea has frequently suffered from extreme agricultural crop droughts, which have led to food shortages, according to the Food and Agriculture Organization (FAO). The increasing frequency of extreme droughts, due to global warming and climate change, has increased the importance of enhancing the national capacity for drought management. Historically, a meteorological drought index based on data collected from weather stations has been widely used. But it has limitations in terms of the distribution of weather stations and the spatial pattern of drought impacts. Satellite-based data can be obtained with the same accuracy and at regular intervals, and is useful for long-term change analysis and environmental monitoring and wide area access in time and space. The Evaporative Stress Index (ESI), a satellite-based drought index using the ratio of potential and actual evaporation, is being used to detect drought response as a index of the droughts occurring rapidly over short periods of time. It is more accurate and provides faster analysis of drought conditions compared to the Standardized Precipitation Index (SPI), and the Palmer Drought Severity Index (PDSI). In this study, we analyze drought events during 2015-2017 in North Korea using the ESI satellite-based drought index to determine drought response by comparing with it with the SPI and SPEI drought indices.

• 한국농공학회논문집
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• 제63권5호
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• pp.95-105
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• 2021

Drought is a disaster that causes prolonged and wide scale damage. Recently, the severity and frequency of drought occurrences, and drought damage have been increased significantly due to climate change. As a result, a quantitative study of drought factors is needed to better understand and prevent future droughts. In the case of agricultural drought, several existing studies examine the economic damage caused by droughts and their causes, but these studies are not well suited to estimating crop-oriented agricultural drought damage and the factors that absolutely affect agricultural drought. This study determines which factors most affect agricultural drought. It examines meteorological factors and those related to agricultural water supplied by irrigation facilities. Rice paddy production per unit area is lower than the average from the last two years where agricultural drought occurred. We compare the relative frequency of agricultural drought impacts with irrigation facilities, effective reservoir storage, the number of water supply facilities, and the meteorological drought index such as Standardized Precipitation Index (SPI). To identify factors that affect agricultural drought, we correlate rice paddy production anomalies with irrigation water supply for the past two years. There was a high positive correlation between rice paddy production and irrigation water usage, and there was a low or moderate negative correlation between rice paddy production anomalies compared to the average of the past two years and SPI. As a result, agricultural water supply by irrigation facilities was judged to be more influential than meteorological factors in rice paddy production. This study is expected to help local governments establish policies related to agricultural drought response.

• 한국농공학회논문집
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• 제62권3호
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• pp.51-61
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• 2020

Drought events are not clear when those start and end compared with other natural disasters. Because drought events have different timing and severity of damage depending on the region, various studies are being conducted using satellite images to identify regional drought occurrence differences. In this study, we investigated the applicability of drought assessment using the Evaporative Stress Index (ESI) based on Moderate Resolution Imaging Spectroradiometer (MODIS) satellite images. The ESI is an indicator of agricultural drought that describes anomalies in actual and reference evapotranspiration (ET) ratios that are retrieved using remotely sensed inputs of Land Surface Temperature (LST) and Leaf Area Index (LAI). However, these approaches have a limited spatial resolution when mapping detailed vegetation stress caused by drought, and drought hazard in the actual crop cultivation areas due to the small crop cultivation in South Korea. For these reasons, the development of a drought index that provides detailed higher resolution ESI, a 500 m resolution image is essential to improve the country's drought monitoring capabilities. The newly calculated ESI was verified through the existing 5 km resolution ESI and historical records for drought impacts. This study evaluates the performance of the recently developed 500 m resolution ESI for severe and extreme drought events that occurred in South Korea in 2001, 2009, 2014, and 2017. As a result, the two ES Is showed high correlation and tendency using Receiver Operating Characteristics (ROC) analysis. In addition, it will provide the necessary information on the spatial resolution to evaluate regional drought hazard assessment and and the small-scale cultivation area across South Korea.

• 한국방재학회 논문집
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• 제5권4호
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• pp.59-69
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• 2005

가뭄을 미리 발견하고 감시하는 것은 어려우나, 가뭄지수를 이용하면 가뭄의 파악이 용이하다. PDSI는 통상적으로 가장 널리 이용되나 운영상 제한성을 가지고 있다. 최근 들어 가뭄을 인지하고 감시하는 능력이 향상된 SPI가 개발되었으며, 이는 기존의 지수들에 비해 모든 시간간격에 적용이 가능하고 간단하게 이용이 가능하다. KBDI는 상부토양층의 누적수분부족량을 산출함에 있어서 증발산과 강수량의 순영향을 나타내는 지수로 정의하였다. 본 연구에서는 PDSI, SPI, KBDI를 이용하여 산정된 가뭄지수의 상호비교 연구를 통하여 표준 가뭄지수를 제안하고자 한다. 이를 위하여 우리나라 8개 수계의 30년 이상의 기상자료를 보유한 기상청 강우관측소 자료를 이용하였다. 그 결과 PDSI는 누적되는 강우의 부족으로 가뭄심도를 나타내는 데 유리하고, SPI와 KBDI는 단기간 강우부족을 나타내는데 유리한 것으로 나타났다.

• 한국농공학회논문집
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• 제61권1호
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• pp.145-159
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• 2019

A good number of drought indices have been introduced and applied in different regions for monitoring drought conditions, but some of those are region-specific and have limitations for use under other climatic conditions because of the inherently complex characteristics of drought phenomenon. Standardized Precipitation Index (SPI) indices are widely used all over the world, including Bangladesh. Although newly developed, studies have demonstrated The Effective Drought Index (EDI) to perform better compared to SPIs in some areas. This research examined the performance of EDI to the SPI for detecting drought events throughout 35 years (1981 to 2015) in Bangladesh. Rainfall data from 27 meteorological stations across Bangladesh were used to calculate the EDI and SPI values. Results suggest that the EDI can detect historical records of actual events better than SPIs. Moreover, EDI is more efficient in assessing both short and long-term droughts than SPIs. Results also indicate that SPI3 and the EDI indices have a better capability of detecting drought events in Bangladesh compared to other SPIs; however, SPI1 produced erroneous estimates. Therefore, EDI is found to be more responsive to drought conditions and can capture the real essence of the drought situation in Bangladesh. Outcomes from this study bear policy implications on mitigation measures to minimize the loss of agricultural production in drought-prone areas. Information on severity level and persistence of drought conditions will be instrumental for resource managers to allocate scarce resources optimally.