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금동혁 ( Donghyuk Kum ),유지철 ( Jichul Ryu ),최재완 ( Jaewan Choi ),강형우 ( Hyunwoo Kang ),장춘화 ( Chun Hwa Jang ),신동석 ( Dong Suk Shin ),이재관 ( Jae Kwan Lee ),임경재 ( Kyoung Jae Lim ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.1
Recently various Best Management Practices have been applied at a field to reduce soil erosion. Hourly Runoff and Sediment Model for Best Management Practices (HRSM4BMP) model could be used to evaluate soil erosion reduction for various agricultural BMPs at fields. Runoff and sediment yield from source areas have to be predicted with greater accuracies to evaluate sediment reduction efficiently with BMPs. To achieve this the best parameters related with runoff and sediment modules of the HRSM4BMP model should be identified with proper calibration processes. Although manual calibration is often utilized in calibrating runoff and sediment using the HRSM4BMP objective calibration method would be recommended. The purpose of the study was to develop an automatic calibration tool of the HRSM4BMP model with PARASOL method. This automatic calibration tool was applied to Bangdongri Chuncheon-si to evaluate its calibration performance. The R² NSE and RMSE value for runoff estimation were 0.92, 0.92, 0.3 m³ and for sediment yield estimation were 0.94 0.94 0.0027kg. As shown in this result automatic calibration tool of HRSM4BMP model would be used to determine the best parameters and can be used to simulate runoff and sediment yield with acceptable accuracies.
미래 기후 변화에 따른 임하댐 유역 토양유실량 변화 비교 평가
장춘화 ( Chun Hwa Jang ),강현우 ( Hyunwoo Kang ),금동혁 ( Donghyuk Kum ),양재의 ( Jay E Yang ),김성철 ( Sung Chul Kim ),최우영 ( Woo Young Choi ),임경재 ( Kyoung Jae Lim ) 한국농공학회 2012 한국농공학회 학술대회초록집 Vol.2012 No.-
기후 변화란 현재의 기후가 자연적인 요인과 인위적인 요인에 의하여 점차 변화하는 것을 뜻하나, 고도로 도시화가 이루어진 현재는 자연적인 요인에 의한 변화 보다는 인위적인 요인인 인간 활동에 의해 발생하는 변화를 주로 말한다. 기후변화에 영향을 미치는 인위적인 요인에는 화석연료 과다 사용에 의해 발생한 온실기체에 따른 대기조성변화, 도시, 산업 발달에 따른 토지이용변화 등이 있다. 이러한 기후변화는 도시, 산업 개발이 계속됨에 따라 지속적으로 이루어지고 있으며, 기후변화에 따른 토양유실량 변화 또한 지속적으로 변동될 것으로 전망한다. 현재 우리나라는 자원으로써의 토양 보전을 위해 다양한 정책들이 실시되고 있으나 기후변화에 대비한 정책 수립과 연구는 미비한 실정이다. 따라서 본 연구에서는 기후변화센터(CCIC)에서 제공하는 SRES A1B 시나리오의 한반도 자료를 이용하였으며, 편이보정을 통해 미래의 기상자료를 현재 기상자료에 적용할 수 있도록 보정하여 사용하였다. 미래 기후 자료는 2020세기(2015년 ~ 2025년), 2040세기(2035년 ~ 2045년), 2060세기(2055년 ~ 2065년), 2080세기(2075년 ~ 2085년)의 강우자료를 이용하여 토양유실량 평가를 위한 USLE R factor를 산정을 위해 사용하였다. 본 연구의 대상지역은 토양유실에 따른 탁수문제가 다년간 지속되고 있는 낙동강 수계에 위치한 임하댐 유역이며, 토양유실량 산정을 위해서 USLE 방법을 사용하였다. 2020세기, 2040세기, 2060세기, 2080세기 미래 기후변화에 따른 토양유실량 변화를 비교 분석하고 수 년 간의 현장조사를 통해 제시한 평균 토양유실량과의 비교를 통하여 미래 기후 변화가 임하댐 토양유실량에 미치는 영향을 평가하였다. 본 연구를 통하여 미래 기후변화에 따른 토양유실량의 변동성을 파악할 수 있으며, 미래 기후변화에 따른 정책 및 기준수립이 필요함을 전망할 수 있다.
장춘화(Chun Hwa Jang),류지철(Jichul Ryu),강현우(Hyunwoo Kang),금동혁(Donghyuk Kum),김영석(Youngsug Kim),박화용(Hwa Yong Park),김기성(Ki Sung Kim),임경재(Kyoung Jae Lim) 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.6
Universal Soil Loss Equation (USLE) has been used to estimate potential long-term soil erosion in the fields. However, the USLE does not estimate sediment yield due to lack of module considering sediment delivery ratio (SDR) for watershed application. For that reason, the Sediment Assessment Tool for Effective Erosion Control (SATEEC) system was developed and applied to compute the sediment yield at watershed scale. However, the R factor of current SATEEC Ver. 2.1 was estimated based on 5-day antecedent rainfall, it is not related with fundamental concept of R factor. To compute R factor accurately, the energy of rainfall strikes should be considered. In this study, the R module in the SATEEC system was enhanced using formulas of Williams, Foster, Cooley, CREAMS which could consider the energy of rainfall strikes. The enhanced SATEEC system ver. 2.2 was applied to the Imha watershed and monthly sediment yield was estimated. As a result of this study, the R2 and NSE values are 0.591 and 0.573 for calibration period, and 0.927 and 0.911 for validation period, respectively. The results demonstrate the enhanced SATEEC System estimates the sediment yield suitably, and it could be used to establish the detailed environmental policy standard using USLE input dataset at watershed scale.
USLE모형과 시강우를 고려한 토양유실 평가 시스템을 이용한 연간 토양유실량 비교 분석
금동혁(Donghyuk Kum),류지철(Jichul Ryu),강현우(Hyunwoo Kang),장춘화(Chun Hwa Jang),신민환(Min Hwan Shin),신동석(Dong Shuk Shin),최중대(Joongdae Choi),임경재(Kyoung Jae Lim) 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.6
Soil erosion and sediment has been known as one of pollutants causing water quality degradation in water bodies. With global warming issues worldwide, various soil erosion studies have been performed. Although on-site monitoring of sediment loss would be an ideal method to evaluate soil erosion condition, modeling approaches have been utilized to estimate soil erosion and to evaluate various best management practices on soil erosion reduction. Although the USLE has been used in soil erosion estimation for the last 40 years, the USLE model has limitations in estimating event-based soil erosion reflecting rainfall intensity and rainfall duration for long-term period. Thus, the calibrated model, capable of simulating soil erosion using hourly rainfall data, was utilized in this study to evaluate the effects of rainfall amount and rainfall intensity on soil erosion. It was found that USLE soil erosion value is 3.06 ton ha<SUP>-1</SUP> yr<SUP>-1</SUP>, while soil erosion values from 2006 ~ 2010 were 2.469 ton ha<SUP>-1</SUP> yr<SUP>-1</SUP>, 0.882 ton ha<SUP>-1</SUP> yr<SUP>-1</SUP>, 1.489 ton ha<SUP>-1</SUP> yr<SUP>-1</SUP>, 2.158 ton ha<SUP>-1</SUP> yr<SUP>-1</SUP>, 1.602 ton ha<SUP>-1</SUP> yr<SUP>-1</SUP>, respectively. Especially, soil erosion from single storm event for 2008-2010 would be responsible for 30% or more of annual soil loss. As shown in this study, hourly soil erosion estimation system would provide more detailed output from the study area. In addition, the effects of rainfall intensity on soil erosion could be evaluated with this system.
Nickel supported on low-rank coal for steam reforming of ethyl acetate
Ruhswurmova, Nikola,Kim, Soohyun,Yoo, Jiho,Chun, Donghyuk,Rhim, Youngjoon,Lim, Jeonghwan,Kim, Sangdo,Choi, Hokyung,Lee, Sihyun Elsevier 2018 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.43 No.33
<P><B>Abstract</B></P> <P>Ethyl acetate is a volatile organic compound (VOC) that has emerged as a major environmental pollutant and also one of representative components of bio-oil. In this study, mostly metallic Ni particles (size: <10 nm) were finely dispersed on low-rank coal (LRC) by the ion-exchange process. Catalytic steam reforming of ethyl acetate (EA) was performed over Ni supported on Eco LRC (Ni/Eco) to reduce EA emissions and simultaneously produce H<SUB>2</SUB>. EA reforming over 17.7 wt% Ni/Eco at 400 °C results in H<SUB>2</SUB> yield of 70%–80%; this is comparable to that achieved with reforming over commercial Ni/Al<SUB>2</SUB>O<SUB>3</SUB>. Advantageously, metallic Ni particles are dominant over Ni oxides on LRC, and therefore, the pre-reduction step routinely required for an alumina-supported catalyst can be skipped. Furthermore, deactivation by coking is slower with Ni/Eco than with Ni/Al<SUB>2</SUB>O<SUB>3</SUB> during long-term operation, probably because of the smaller particle size and preferential adsorption on the coal support.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nano-dispersion of Ni on low rank coal (LRC) is achieved. </LI> <LI> LRC-supported Ni catalyses the steam reforming of ethyl acetate. </LI> <LI> Ni particles on LRC are mostly in active metallic form. </LI> <LI> Ni on LRC is less susceptible to coking-related deactivation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>