NOAA/AVHRR 위성영상을 이용한 기후학적 물수지 분석

권형중,신사철,김성준,Kwon, Hyung-Joong,Shin, Sha-Chul,Kim, Seong-Joon 한국농공학회 2005 한국농공학회논문집 Vol.47 No.1

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.

SWSI를 이용한 준분포형 수문학적 가뭄 평가

권형중,김성준,Kwon Hyung-Joong,Kim Seong-Joon The Korean Society of Agricultural Engineers 2006 한국농공학회논문집 Vol.48 No.2

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.

Estimation of Monthly Actual Evapotranspiration Using NOAA-AVHRR Satellite Images

권형중,신사철,김성준,Kwon, Hyung-Joong,Shin, Sha-Chul,Kim, Seong-Joon The Korean Society of Agricultural Engineers 2004 한국농공학회논문집 Vol.46 No.1

The purpose of this study is to estimate monthly evapotranspiration (ET) using normalized difference vegetation index (NDVI) obtained from NOAA-AVHRR data sets. Actual evapotranspiration was evaluated by the complementary relationship, and monthly NDVI was obtained by maximum value composite method from daily NDVI images in the Korean peninsula for the year 2001 The monthly actual ETs for each land cover were compared with the monthly NDVIs to determine relationships between actual ET and NDVI for each land cover category, There was a high correlation between monthly NDVI and monthly mean actual ET. This study presents an alternative approach for land surface evapotranspiration based on remote sensing techniques.

SWSI 가뭄지수를 보완한 농촌용수구역 단위의 가뭄 평가

권형중 ( Hyung Joong Kwon ),임혁진 ( Hyuk Jin Lim ),김성준 ( Seong Joon Kim ) 한국지리정보학회 2007 한국지리정보학회지 Vol.10 No.1

본 논문의 목적은 농촌용수구역(안고 및 안서용수구역)에 대하여 보완된 SWSI를 이용하여 농업가뭄을 평가하는 것이다. 농업가뭄을 평가하기 위한 보완된 SWSI의 입력자료는 강수량, 농업용 저수지의 유입 및 저류량을 사용하였다. 강수량 자료는 대상 용수구역에서 가장 가까운 기상청의 천안관측소 자료를 획득하였고 저수지 저수량 자료는 한국농촌공사로부터 획득하였으며 저수지 유입량 자료는 저수지 상류유역에 대하여 SLURP 모형을 이용하여 산정하였다. 1983년부터 2001년까지 SWSI 기반의 농업가뭄을 평가한 결과, 전국적으로 가뭄이 극심하였던 1994년 7월, 1995년 6월, 2001년 5월에 극심한 가뭄을 나타내었으며 이러한 결과를 PDSI와 SWSI와 비교하였다. The purpose of this study is to assess agricultural drought using modified SWSI(Surface Water Supply Index) in Ango and Anseo agricultural district. Precipitation, reservoir inflow and storage data were used for input data of modified SWSI. Precipitation data was obtained from KMA(Korea Meteorological Administration) and reservoir storage data was obtained from KARICO(Korea Agricultural & Rural Infrastructure Corporation) and reservoir inflow data was simulated by SLURP(Simple LUmped Reservoir Parametric). SWSI based agricultural drought index was evaluated for the period of 1983 and 2001. As results, for the drought periods(July-1994, June-1995, May-2001) agricultural drought indices represented extremely drought states. The result was compared with PDSI and SWSI and checked the applicability of the suggested index in our agricultural drought situation.

기후변화 대응방안 수립을 위한 농업용 저수지 이수안전도 평가

권형중 ( Kwon Hyung-joong ),남원호 ( Nam Won-ho ),최경숙 ( Choi Gyeong-suk ) 한국농공학회 2020 한국농공학회논문집 Vol.62 No.2

This study assessed the reliability of the agricultural water supply based on future climate change scenarios, and suggested plans to improve the reliability in order to promote the adaptability of irrigation water in agricultural reservoirs to climate change. The assessment of agricultural water supply reliability was performed on reservoirs which had a lower water quantity than their design basis and which had recently been subject to drought. In other words, from the irrigation districts of main intake works among the reservoirs managed by the Korea Rural Community Corporation, 1∼2 districts in each province-that is, a total of 13 districts -that were recently designated as a district for securing agricultural water (drought prevention district) were selected. Climate change scenarios were applied to the selected districts to analyze their future water supply reliability compared to the current level. All districts selected showed a drought frequency of 4 years or shorter, which demonstrated the need to establish climate change response plans. As plans for responding to climate change, a plan that utilizes supplemental intake works to reduce the area of the irrigation districts of main intake works, and another one that increases the capacity of main intake works were adopted to reanalyze their water supply reliability. When the area of the irrigation districts of main intake works was reduced by about 30∼40%, the drought frequency dropped to more than 10 years, securing the reliability of water supply. To secure the reliability by increasing the capacity of main intake works, it was calculated that about 19,000∼2,400,000 tons need to be added to each reservoir. In addition, climate change response plans were suggested to improve the reliability of the water supply in each district based on the results of economic analysis.

국가 지하수 관측망 자료를 이용한 가뭄평가 방법 연구

권형중(Kwon Hyung Joong),김성준(Kim Seong Joon) 대한토목학회 2007 대한토목학회논문집 B Vol.27 No.2B

본 연구의 목적은 GIMS(National Groundwater Information Management and Service Center)에서 운영하고 있는 국가 지하수관측망의 지하수의 자료를 이용하여 가뭄을 평가할 수 있는 방법을 제시하고 2001년 가뭄시상에 대하여 그 활용성을 검토하는 것이다. 가뭄지표로서 지하수위 자료를 활용하기 위해서는 가뭄단계별 지하수위 임계값을 결정하는 것이 필요하며 이를 위하여 두 가지 방법을 제시하였다. 방법 ① 지하수위와 기 개발된 MSWSI 적용 결과와의 상관분석을 통한 가뭄단계별 지하수의 임계값 결정, 방법 ② 지하수위 자료의 시계열 확률분석을 통한 가뭄단계별 지하수위 임계값 결정. 제시된 두 가지 방법을 적용한 결과, 방법 ①은 상대적으로 높은 신뢰도로서 제한된 유역에서만 적용이 가능한 반면, 방법 ②는 지역별 가뭄 평가의 신뢰도가 다소 떨어질 수 있으나 간단한 알고리즘을 통하여 유역 전반에 걸쳐 가뭄평가가 가능하였다. The objective of this study is to suggest methods for evaluating drought using groundwater level data of GIMS (National Groundwater Information Management and Service Center) and to check the applicability of the suggested methods in 2001 drought situation. It is necessary to identify threshold level of each drought classification for applying groundwater level data to evaluate drought. Two methods were suggested for identifying threshold level of each drought classification: ① Linear regression analysis between groundwater level data and MSWSI results, ② Probability analysis using multi-temporal groundwater level data. As results of two methods application, method ① had comparative high accuracy and could be applied in case of specific watersheds. Method ② could be applied in all watersheds even though there were low accuracies regionally.

TOPMODEL과 Muskingum 기법을 이용한 안성천유역의 홍수유출분석

권형중 ( Kwon Hyung-joong ),김성준 ( Kim Seong-joon ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-

In this study, a topography based hydrologic model (TOPMODEL) was tested on the Anseong-cheon watershed. Pit in watershed was removed by liner trend surface interpolator. The DTM Analysis program is used to derived a distribution of ln(tanβ) values from DEM (Digital Elevation Model) using the MDF (Multiple Direction Flow) algorithm of Quinn et al (1995). Current TOPMODEL program limits are number of time step, ln(tanβ) increment, delay histogram ordinate and size of subcatchment pixel maps. Therefore, TOPMODEL is not suitable for application of large watershed. Muskingum method and watershed division enhance grid pixel resolution for rainfall-runoff simulation accuracy.

SWSI 가뭄지수를 보완한 수문학적 가뭄평가지수 개발

권형중 ( Kwon Hyung Joong ),임혁진 ( Lim Hyuk Jin ),박민지 ( Park Min Ji ),김성준 ( Kim Seong Joon ),김수근 ( Kim Soo Geun ),박현진 ( Park Hyun Jin ) 한국농공학회 2004 한국농공학회 학술대회초록집 Vol.2004 No.-

① MSWSI의 입력자료로서 강우, 하천수위, 댐저수율, 지하수위자료를 사용하였다. 강우자료는 기상청 산하의 61개소의 기상관측소 자료를 사용하였고 유역에 대한 평균강우량을 추출하기 위하여 공간강우자료로서 변환한 후 각각의 유역에 대하여 년도별/월별 평균 강우량을 추출하였다. 하천수위자료는 총 335개의 하천수위관측소 중에서 자료보유년도 및 가뭄에의 하천수위 반응 정도를 분석하여 14개(1차년도)의 관측소를 key station으로 선정하였다. 댐저수율자료는 한국수자원공사에서 관리하는 주요 댐 관측소 7개소의 월저수율 자료를 사용하였다. 지하수위자료는 지하수정보센터에서 관리하는 지하수위관측공 자료를 대상으로 1995년과 1996년에 설치하여 관측된 52개 관측공 중 가뭄에 대한 반응 정도를 분석하여 21개의 key station을 선정하였다. ② 준 분포형 형태의 가뭄평가를 위하여 전국을 32개의 유역으로 분할하였다. MSWSI를 산정하기 위해서는 유역의 가뭄에 영향을 미치는 수문인자를 결정하고 결정된 각종 수문인자에 확률의 개념을 추가하여 시계열을 분석을 통하여 월별 확률밀도함수를 산정하고, 이를 이용하여 누가확률분포함수를 산정하여 비초과확를을 구하였다. 가중계수를 구하기 위해서 각종 수문인자의 상대적인 기여를 첨가하여 가중계수를 취하는 Mckee 방법을 채택하였다. ③ 1974년부터 2001년까지의 MSWSI 가뭄지수를 산정하였다. 1974년부터 1995년까지는 지하수관측공의 지하수위자료가 없으므로, 강우, 하천수위, 댐수위 자료만을 이용하여 산정하였으며, 1996년부터 2001년까지는 지하수위 자료를 추가하여 산정하였다. ④ 현재, 하천수위관측소는 14개소, 주요댐은 7개소, 지하수위관측소는 21개소를 key station으로 선정하였다. 향후, key station 개수와 유역분할 개수를 점차적으로 늘려 100여 개의 유역으로 나누어 적용하고자 한다. 수자원단위지도의 중권역은 117개로서 행정구역상의 시군구 형태와 비교할 수 있으며, 본 연구에서도 연구의 최종목표는 시군구 단위, 수자원단위지도의 중권역 단위의 수문학적 가뭄평가를 하고자 한다. A hydrological drought index, MSWSI (Modified Surface Water Supply Index) was suggested based on SWSI. With the available data of spatially distributed gauge 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 and SPI, and check the applicability of the suggested index in our hydrologic drought situation.

웹기반의 하천환경생태주제도 정보시스템 시범구축

권형중(Kwon Hyung Joong),이근상(Lee Geun Sang),황의호(Hwang Eui Ho),고덕구(Koh Deuk Koo) 대한토목학회 2007 대한토목학회논문집 D Vol.27 No.3D

현재 국가에서는 2004년에 구축된 하천관리지리정보시스템(RIMGIS; River Information Management Geographic Information System)의 활용성 증대방안 사업을 진행하고 있다. 이를 통하여 RIMGIS를 웹기반 시스템으로 전환하여 업무지원 기능을 확대하며 시스템에서 제공하는 하천관련 주제도의 다양화를 추진하고 있다. 본 연구는 하천관련 사업에서 조사되는 환경생태 정보를 DB화하고 정보 활용의 극대화를 위해서 GIS 기반의 하천환경생태 주제도(14개)를 시범유역(안성천 및 오산천)에 대하여 구축하였으며 효율적인 정보 서비스를 위해 웹기반의 하천환경생태 정보시스템을 구축하였다. 이를 위하여 하천관련 사업(하천정비기본계획 및 하천환경정비사업)에서 조사되는 환경생태 정보들을 생물, 화학, 물리 분야로 분류하여 14개의 주제도 작성 및 구축 프로세스를 제시하였으며 구축된 주제도 및 환경생태 정보들에 대한 데이터모델을 설계하고 공간 및 속성레이어를 정의를 통하여 35개의 웹페이지를 설계 및 구축하였다. Currently, the government tries to improve the applicability of RIMGIS (River Information Management Geographic Information System). CS (Client Server)-based RIMGIS was replaced by Web-based RIMGIS, and various thematic maps were established to expand service function of RIMGIS. The objectives of this study were to construct database of river environmental and ecological information, and to produce 14 river environmental and ecological thematic maps, and finally to build web-based information reference system. River environmental and ecological information of water-related national project was categorized into 4 fields (biological, chemical and physical field) and the production processes of each thematic map were suggested. According to established data models of each thematic map and defined spatial/attributive layers, 35 web pages were designed.

NOAA/AVHRR 위성영상을 이용한 한반도 증발산량 산정

권형중 ( Kwon Hyung Joong ),임혁진 ( Lim Hyuk Jin ),신사철 ( Shin Sha Chul ),김성준 ( Kim Seong Joon ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-

The purpose of this study is to estimate monthly evapotranspiration (ET) using normalized difference vegetation index (NDVI) from NOAA/ A VHRR Korea peninsula images. Morton actual ET for land surface conditions was evaluated by using 73 daily meteorological data, and the monthly averaged Morton ETs for each land cover were compared with the monthly maximum NDVIs of a year, 2001. There was a high correlation between monthly maximum NDVI and monthly averaged Morton ET. It was concluded that the monthly ET can be estimated from the NDVI information of NOAA/AVHRR.