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Landsat TM과 KOMPSAT-1 EOC 영상을 이용한 토지피복분류 및 SCS-CN 직접유출량 산정
권형중,김성준,고덕구,Kwon Hyong Jung,Kim Seong Joon,Koh Deuk Koo 한국관개배수위원회 2000 한국관개배수논문집 Vol.7 No.2
The purpose of this study is to obtain land cover classification map by using remotely sensed data : Landsat TM and KOMPSAT-1 EOC, and to estimate SCS-CN direct runoff by using point rainfall(Thiessen network) and spatial rainfall(surface interpolation) f
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.
GIS 및 다시기 RS 자료를 이용한 토양손질량 변화 및 이동경로 추정
권형중,박근애,김성준 한국공간정보학회 2002 한국공간정보학회지 Vol.10 No.1
본 연구는 토양손실 추정 모형인 RUSLE를 이용하여 안성천의 평택수위관측소 (건교부)를 중심으로한 유역의 토양손실량 및 유실된 토사의 이동경로를 분석하고자 하였다. 모형의 입력자료로 사용되는 지형정보 자료를 RS와 G1S 기법을 이용하여 구축함으로써 RUSLE 모형의 적용성을 평가하였다. 과거에 비하여 다양한 토지피복 형태가 변화된 안성천 유역(583.9 km)에 대하여 Landsat MSS 및 TM 위성자료를 이용하여 토지피복 변화에 대한 GIS 입력자료를 구축하였다. 강우자료는 2개의 강우 관측소의 1993년부터 2000년까지의 연평균 강우자료를 surface interpolation을 수행하여 지점강우를 공간강우로서 변환하여 구축하며 토양손실량을 산정하였다. 그 결과 1990년에 비하여 2000년의 토양손실변화는 25.3 ㎢ 줄어든 산림지역의 토양손실량은 3751.2 ton/yr 감소한 반면, 22.5 km 늘어난 밭지역의 토양손실량은 5395.4 tou/yr 증가하였다. 따라서, 산림지역은 1.1배의 면적감소에 대하여 1.2배의 토양손실량이 감소된 반면, 밭지역은 1.3배의 면적증가에 대하여 4.4배의 토양손실량의 증가를 보여 밭지역이 토양손실량 변화 에 민감함을 확인할 수 있었고, 유역 전체의 토양손실량은 5.4 kg/㎡/yr로 증가하였다. The purpose of this study is to estimate temporal soil loss change according to long-term land cover changes using G1S and RS. Revised USLE(Universal Soil Loss Equation) factors were prepared by using point rainfall data, DEM(Digital Elevation Model), soil map and land cover map. During the past two decades, land cover changes were traced by using Landsat MSS and TM data. As a result, forest area in 2000 has decreased 25.3 $km^2$ compared with that in 1990. Soil loss has decreased 3751.2 tou/yr. On the other hand, upland area has increased 22.5 $km^2$. Soil loss of upland has increased 5395.4 to/yr. Therefore, soil loss in 2000 increased 6.3 kg/$m^2$/yr compared with that in 1990. This was mainly caused by the increased upland area.
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.
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 준분포형 수문학적 가뭄평가 연구
권형중,박현진,홍대의,김성준 한국수자원학회 2006 한국수자원학회논문집 Vol.39 No.8
수문학적인 가뭄평가를 위하여 SWSI 가뭄지수를 보완한 MSWSI 개발하였다. MSWSI의 적용을 위하여 가뭄에 영향을 미치는 수문인자가 동질한 지역 즉, 댐, 하천, 지하수, 강수 지역으로 전국을 32개의 지역으로 분할하였다. 각각의 지역에 MSWSI를 적용하여 공간적으로 준분포형의 수문학적 가뭄 정보를 획득하였으며, 시간적으로 1974년부터 2001년까지의 한달 간격으로 평가하였다. 과거 가뭄 사상 년도에 대하여 기상학적 가뭄지수인 PDSI와의 비교 A hydrological drought index, MSWSI (Modified Surface Water Supply Index) was suggested based on SWSI. South Korea was divided into 32 regions considering the distribution of available gauge station of precipitation, dam storage, stream water level and na