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ArcGIS Model Builder를 이용한 토양유실 우선관리 지역 선정 자동화 모형 개발
금동혁,최재완,김익재,공동수,류지철,강현우,임경재,Kum, Dong-Hyuk,Choi, Jae-Wan,Kim, Ik-Jae,Kong, Dong-Soo,Ryu, Ji-Chul,Kang, Hyun-Woo,Lim, Kyoung-Jae 한국농공학회 2011 한국농공학회논문집 Vol.53 No.1
Due to increased human activities and intensive rainfall events in a watershed, soil erosion and sediment transport have been hot issues in many areas of the world. To evaluate soil erosion problems spatially and temporarily, many computer models have been developed and evaluated over the years. However, it would not be reasonable to apply the model to a watershed if topography and environment are different to some degrees. Also, source codes of these models are not always public for modification. The ArcGIS model builder provides ease-of-use interface to develop model by linking several processes and input/output data together. In addition, it would be much easier to modify/enhance the model developed by others. Thus, simple model was developed to decide soil erosion hot spot areas using ArcGIS model builder tool in this study. This tool was applied to a watershed to evaluate model performance. It was found that sediment yield was estimated to be 13.7 ton/ha/yr at the most severe soil erosion hot spot area in the study watershed. As shown in this study, the ArcGIS model builder is an efficient tool to develop simple models without professional programming abilities. The model, developed in this study, is available at http://www.EnvSys.co.kr/~sateec/toolbox for free download. This tool can be easily modified for further enhancement with simple operations within ArcGIS model builder interface. Although very simple soil erosion and sediment yield were developed using model builder and applied to study watershed for soil erosion hot spot area in this study. The approaches shown in this study provides insights for model development and code sharing for the researchers in the related areas.
시강우량을 이용한 필지별 유출-유사 평가 시스템 및 BMPs 평가 모듈 개발 및 적용성 평가
금동혁 ( Dong Hyuk Kum ),류지철 ( Ji Chul Ryu ),최재완 ( Jae Wan Choi ),신민환 ( Min Hwan Shin ),신동석 ( Dong Suk Shin ),천세억 ( Se Uk Cheon ),최중대 ( Joong Dae Choi ),임경재 ( Kyoung Jae Kim ) 한국물환경학회 ( 구 한국수질보전학회 ) 2012 한국물환경학회지 Vol.28 No.3
Soil erosion has been emphasized as serious environmental problem affecting water quality in the receiving waterbodies. Recently, Best Management Practices (BMPs) have been applied at a field to reduce soil erosion and its effectiveness in soil erosion reduction has been monitored with various methods. Although monitoring at fields/watershed outlets would be accurate way for these ends, it is not possible at some fields/watersheds due to various limitations in direct monitoring. Thus modeling has been suggested as an alternative way to evaluate effects of the BMPs. Most models, which have been used in evaluating hydrology and water quality at a watershed, could not reflect rainfall intensity in runoff generation and soil erosion processes. In addition, source codes of these models are not always public for modification/enhancement. Thus, runoff- sediment evaluation system using hourly rainfall data and vegetated filter strip (VFS) evaluation module at field level were developed using open source MapWindow GIS component in this study. This evaluation system was applied to Bangdongri, Chuncheonsi to evaluate its prediction ability and VFS module in this study. The NSE and R2 values for runoff estimation were 0.86 and 0.91, respectively, and measured and simulated sediment yield were 15.2 kg and 16.5 kg indicating this system, developed in this study, can be used to simulate runoff and sediment yield with acceptable accuracies. Nine VFS scenarios were evaluated for effectiveness of soil erosion reduction. Reduction efficiency of the VFS was high when sediment inflow was small. As shown in this study, this evaluation system can be used for evaluation BMPs with local rainfall intensity and variations considered with ease-of-use GIS interface.
토양유실 저감을 위한 지표피복 저감효과 변수 결정 및 SWAT 모형 유역단위 효과 분석
금동혁 ( Dong Hyuk Kum ),장춘화 ( Chun Hwa Jang ),신민환 ( Min Hwan Shin ),최중대 ( Joong Dae Choi ),김범철 ( Bom Chul Kim ),정교철 ( Gyo Cheol Jeong ),원철희 ( Chul Hee Won ),임경재 ( Kyoung Jae Lim ) 한국물환경학회 2012 한국물환경학회지 Vol.28 No.6
The purpose of this study was to determine parameters of surface cover materials and evaluation the effects on runoff and sediment reductions with rice straw mat with PAM at watershed scale using the SWAT model. In this study, 1) regression equation of CN for rice straw mat +PAM using SCS curve number method was developed, 2) the USLE P factor, being able to reflect simulation of rice straw mat+PAM in the agricultural field, was estimated for various slope scenarios with VFSMOD-w. Then regression equation for CN and USLE P factor were used as input data in the SWAT model. Assuming rice straw mat+PAM is applied to radish and potato fields, occupying 24% of agricultural fields at the study watershed. Result of direct runoff without rice straw mat+PAM was 65,964,368 m3, with rice straw mat+PAM, direct runoff was 65,637,336 m3 327,031.8 m3 reductions compared without it. Also, result of sediment without rice straw mat+PAM was 163,531 ton, with rice straw mat+PAM, sediment was 84,779 ton, 78,752 ton reduction compared without it. This analysis showed that about 48% sediment reductions would be expected with rice straw mat+PAM. As shown in this study, rice straw mat+PAM would be used as an efficient site-specific BMPs to reduce runoff and sediment discharge from field.
STEPL WEB 모형을 이용한 농촌지역 비점오염원저감 대책 모의
박윤식,금동혁,정영훈,조재필,임경재,김기성,Park, Youn Shik,Kum, Dong Hyuk,Jung, Young Hun,Cho, Ja Pil,Lim, Kyoung Jae,Kim, Ki Sung 한국농공학회 2014 한국농공학회논문집 Vol.56 No.5
Sediment-laden water is problematic in aquatic ecosystem and for hydraulic structures in a watershed, and agriculture area in a watershed is one of source areas of nonpoint source (NPS), since soil surface typically exposures due to agricultural activities. Especially, severe sediment might flow into stream when agricultural area is located near stream like the Imha-dam watershed. Soil erosion is affected by precipitation, therefore there is a need to consider precipitation characteristics in soil erosion and best management practices (BMPs) simulation. The Web-based Spreadsheet Tool for the Estimation of Pollutant Load (STEPL WEB) allows estimating long-term sediment loads and the impact of best management practices to reduce sediment loads. STEPL WEB and predicted precipitation data by MIROC-ESM model was used to estimate sediment loads and its reduction by filter strip and conversion of agricultural area to forest in the future 30 years. The result indicates that approximately 70 % of agricultural area requires filter strip installation or that approximately 50 % of agricultural area needs to be converted to forest, for 41 % of sediment load reduction.
서울에서의 인플루엔자 B바이러스 유행감시, 1985-1986
박기덕,조양벽,김영선,백승복,금동혁,신미자,Park, Kee-Duk,Cho, Yang-Byuk,Kim, Young-Sun,Paik, Seung-Bok,Keum, Dong-Hyuk,Shin, Mee-Ja 대한미생물학회 1987 大韓微生物學會誌 Vol.22 No.1
During 31 days (5 week) from December 9th 1985 to January 8th 1986, Influenza B epidemic were observed in Seoul city. Epidemic peak was shown at 52nd week in 1985. The Epidemic associated viruses were determined as B/yamanish/510/84 and B/Ann Arbor/1/86-like strain. From total of 124 specimens of influenza-like illness children virus isolation rate were average 4.0%, much lower than that of influenza A virus isolation experience. In the epidemic influenza B infection were predominantly involved in school age children.