새만금유역 농업비점오염 저감기법개발 2차년도 연구결과

장정렬 ( Jeong Ryeol Jang ),조재필 ( Jae Pil Cho ),신유리 ( Yu Ri Shin ),정지연 ( Ji Yeon Jung ) 한국물환경학회 ( 구 한국수질보전학회 ) 2012 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2012 No.-

간척지 논 농업배수 처리에 적합한 인공습지 설계 기법

장정렬,신유리,정지연,최강원,Jang, Jeong-Ryeol,Shin, Yu-Ri,Jung, Ji-Yeon,Choi, Kang-Won 한국관개배수위원회 2011 한국관개배수논문집 Vol.18 No.1

The standard design methodology was suggested to construct wetland system for reducing non-point source pollution from Saemangeum reclaimed paddy land. To set for the design flow and concentrations, runoff and water quality survey were conducted during the irrigation period in 2008 at Gyehwa reclaimed paddy land located at near Saemangeum lake. It is rational that 1ha is the optimum constructed wetland size. To meet this size, the moderate drainage area of reclaimed paddy field was 50ha under the conditions that rainfall is 30mm, average runoff coefficient is 0.83, and runoff capture ratio is 0.6. At these condition, the runoff volume from 50ha was 10,520 $m^3/d$ including base flow during irrigation period. To select the optimum wetland system, several case studies were conducted by focusing on the tidal reclaimed land areas having wetland systems in Seokmun. Pond-Wetland system was selected as the standard model because of showing the highest reduction efficiency. Single variable regression equation were delivered to estimate effluent water concentrations from the designed wetland by using long-term monitoring data from the Seokmun experiment site. The effluent concentration from the designed wetland using these equation were showed moderately range.

연구보문 : 수질환경 ; 영농방법에 따른 논에서의 배출부하량 모의

송정헌 ( Jung Hun Song ),강문성 ( Moon Seong Kang ),송인홍 ( In Hong Song ),장정렬 ( Jeong Ryeol Jang ) 한국환경농학회 2012 한국환경농학회지 Vol.31 No.4

BACKGROUND: For Non-Point Source(NPS) loads reduction, pollutant loads need to be quantified for major farming methods. The objective of this study was to evaluate impacts of farming methods on NPS pollutant loads from a paddy rice field during the growing season. METHODS AND RESULTS: The height of drainage outlet, amount of fertilizer, irrigation water quality were considered as farming factors for scenarios development. The control was derived from conventional farming methods and four different scenarios were developed based combination of farming factors. A field scale model, CREAMS-PADDY(Chemicals, Runoff, and Erosion from Agricultural Management Systems for PADDY), was used to calculate pollutant nutrient loads. The data collected from an experimental plot located downstream of the Idong reservoir were used for model calibration and validation. The simulation results agreed well with observed values during the calibration and validation periods. The calibrated model was used to evaluate farming scenarios in terms of NPS loads. Pollutant loads for T-N, T-P were reduced by 5 ∼62%, 8∼37% with increasing the height of drainage outlet from 100 mm of 100 mm, respectively. When amount of fertilizer was changed from standard to conventional, T-N, T-P pollutant loads were reduced by 0∼22%, 0∼ 24%. Irrigation water quality below water criteria Ⅳ of reservoir increased T-N of 9∼65%, T-P of 9∼47% in comparison with conventional. CONCLUSION(S): The results indicated that applying increased the height of drainage after midsummer drainage, standard fertilization level during non-rainy seasons, irrigation water quality below water criteria Ⅳ of reservoir were effective farming methods to reduce NPS pollutant loads from paddy in Korea.

물꼬높이 조절에 따른 논 비점 배출부하 저감효과 모니터링

송정헌 ( Jung Hun Song ),강문성 ( Moon Seong Kang ),송인홍 ( Inhong Song ),김계웅 ( Kye Ung Kim ),장정렬 ( Jeong Ryeol Jang ) 한국농공학회 2013 한국농공학회 학술대회초록집 Vol.2013 No.-

비점오염원 관리를 위해서는 농경지내 발생원 관리가 가장 효과적인 것으로 알려져 있으며 시비 방법 개선, 효율적인 물관리 등을 통한 비점오염원 발생 저감 방안 개발이 요구 되고 있다. 특히, 논의 물꼬 높이를 올리면, 강우 또는 관개수를 저장함에 따라 배수량이 감소하여 배출부하량을 크게 저감할 수 있으며, 관개수량을 절약할 수도 있는 것으로 보고되고 있다. 본 연구에서는 논에서의 물꼬높이 조절에 따른 비점오염 배출량 저감효과를 평가하기 위하여, 물꼬 높이 조절 처리구 및 대조구 모니터링 시스템을 구축하고, 처리구와 대조구의 비점오염 배출부하량을 비교ㆍ분석하고 평가하고자 한다. 물꼬 높이 조절에 따른 비점오염 배출량 저감효과를 평가하기 위해 전라북도 익산시 춘포면 용연리 일대에 시험포장을 구성하였다. 시험포장의 처리방법은 관행 영농방법 적용 시험포, 물꼬 높이 조절 시험포로 2처리 2반복으로 하였다. 대조구의 물꼬 높이는 관행 물꼬 높이를 반영하였으며, 대조군은 관행 물꼬 높이를 기준으로 5 cm 높게 구성하였다. 시비량은 새만금 유역에서의 관행적으로 이루어지고 있는 양으로 시비하였다. 물수지 분석을 위하여 관개수량 측정을 위한 유량계, 침투량 측정을 위한 침투량계, 담수심 측정을 위한 초음파 수위계, 포장 배수량 측정을 위한 위어 및 부자식 수위계를 설치하여 물수지 요소를 측정하였다. 물질수지 분석을 위하여 2주 1회 빈도로 정기 조사를 실시하여 관개수와 논물의 수질을 측정하였으며, 영농 초기 및 강우 시에는 집중조사를 위해 10분 ∼ 2시간 간격으로 논물 및 유출수의 수질을 측정하였다. 본 연구결과는 논에서의 주요 물관리 인자인 물꼬 높이 조절에 따른 비점오염 배출기작을 구명하고, 영농방법개선 방안 수립에 기초자료가 될 것으로 기대된다.

새만금유역의 배출부하 특성

정재운,장정렬,최강원,임병진,이영재,강재홍,박혜린,조소현,Jung, Jae-Woon,Jang, Jeong-Ryeol,Choi, Kang-Won,Lim, Byung-Jin,Lee, Young-Jae,Kang, Jae-Hong,Park, Hye-Lin,Cho, So-Hyun 한국관개배수위원회 2010 한국관개배수논문집 Vol.17 No.2

For efficient water quality management of Saemangeum lake, it is very important to accurately analyze discharged load characteristics using investigated pollution sources data from Saemangeum watershed. Investigation of pollution sources was conducted from 2003 to 2007. In this study, pollution sources are largely classified into human population, livestock, industry, and land use. Discharged loads of BOD, T-N and T-P from classified pollution sources were calculated by Korea TMDL (Total Maximum Daily Load) technical guideline. The calculated results showed that the major sources of BOD and T-N were land use, human population, livestock, and industry in order. However, the major sources of T-P were livestock, land use, human population, and industry in order. Our results clearly show that pollution sources of the priority management for water quality enhancement in the Saemangeum lake has represented land use and livestock.

DNDC를 이용한 논의 온실가스 배출량 모의

신민환,장정렬,원철희,정영훈,이수인,임경재,최중대,Shin, Min Hwan,Jang, Jeong Ryeol,Won, Chul Hee,Jung, Young Hun,Lee, Su In,Lim, Kyoung,Choi, Joong Dae 한국농공학회 2014 한국농공학회논문집 Vol.56 No.2

This study was conducted to predict greenhouse gas (GHG) emission from paddy by future climate change scenario in Korea. Chuncheon city in Kangwon province were selected as study area. A1B Special Report on Emission Scenario (SRES) of the IPCC (Intergovernmental panel on climate change) was used to assess the future potential climate change. The rainfall and temperature was projected to increase by 8.4 % and 1.9 % (2040s), 35.9 % and 27.0 % (2060s), 19.2 % and 30.8 % (2090s), respectively, compare to the 2010s value. Under the climate change, Denitrification-Decomposition (DNDC) predicted an increase in $N_2O$, $CO_2$ and $CH_4$ emissions from paddy. The simulations resulted in annual net emissions of 0.4~2.4, 500.5~734.5 and 29.4~160.4 kg/ha/year of $N_2O-N$, $CH_4-C$ and $CO_2-C$, respectively, with a cumulated global warming potential (GWP) of $14.5{\sim}21.7t{\cdot}CO_2/ha/year$ were affected by rainfall, temperature, manure amendment and fertilizer amount. The simulation results suggested that implementation of manure amendment or reduction of water consumption instead of increased fertilizer application rates would more efficiently mitigate GHG emissions.

만경강유역에서의 HSPF 모형의 보정

정재운,장정렬,정지연,최강원,임병진,김상돈,김갑순,윤광식,Jung, Jae-Woon,Jang, Jeong-Ryeol,Jung, Ji-Yeon,Choi, Kang-Won,Lim, Byung-Jin,Kim, Sang-Don,Kim, Kap-Soon,Yoon, Kwang-Sik 한국관개배수위원회 2011 한국관개배수논문집 Vol.18 No.1

The HSPF (Hydrological Simulation Program-Fortran) model was applied to Mangyeong river watershed to examine its applicability through calibration using monitoring data. For the model application, digital maps were constructed for watershed boundary, land-use, Digital Elevation Model of Mangyeong river watershed using BASINS (Better Assessment Science for Intergrating point and Nonpoint Sources) program. The observed runoff was 1976.4mm while the simulated runoff was 1913.4mm from 2007 to 2008. The model results showed that the simulated runoff was in a good agreement with the observed data and indicated reasonable applicability of the model. In terms of water quality, trends of the observed value were in a good agreement with simulated value despite its model performance lower than expected. However, its reliability and performance were with the expectation considering complexity of the watershed, pollutant sources and land use intermixed in the watershed. Overall, we identified application of HSPF model as reliable evidence by model performance.

실경작지 밭의 비점오염물질 저감을 위한 지표피복재 적용

신민환,장정렬,정영훈,금동혁,원철희,이수인,임경재,최중대,Shin, Min Hwan,Jang, Jeong Ryeol,Jung, Young Hun,Kum, Dong Hyuk,Won, Chul Hee,Lee, Su In,Lim, Kyoung Jae,Choi, Joong Dae 한국농공학회 2014 한국농공학회논문집 Vol.56 No.3

Four actual cultivations were prepared and a variety of soybean was cultivated. A H-flume, an automatic water level gauge and an automatic water sampler were installed at the outlet of each plot equipped for the measurement of flow rate and its water quality. The amount of rainfall of the study area in 2013 was measured as 975.6 mm which was much lower than the annual average rainfall of 1,271.8 mm, resulting in less occurrences in rainfall-runoff events. Rainfall-runoff events were occurred three times during the rainfall event of 4~5 July, 23 and 24 August. The characteristics of NPS pollution discharge of the plots and the reduction effect of the selected BMPs were analyzed during these events. The reduction effect of straw mat and soil amendments (Polyacrylamide (PAM) and Gypsum) on runoff ratio ranged between 38.2 and 92.9% (average 71.6%). The NPS pollution load reduced between 27.7 and 95.1% (average 70.0%) by the application of rice straw mat and soil conditioner when compared with that of control plot. Soybean yield (2,133.3 kg/ha) of the straw mat covered plots increased by 14.3% when compared with control (1,866.7 kg/ha). The effect of straw mat on the yield was not economically viable if the material and accompanying labor costs were considered. The data collected and analyzed on different soil textures and crops in this study are expected to be a fundamental reference for the expansion of the results to the application nationwide and the development of NPS pollution management policies.

영농방법에 따른 논 비점오염 배출량 모니터링 및 모델링

송정헌 ( Jung Hun Song ),강문성 ( Moon Seong Kang ),송인홍 ( Inhong Song ),이경도 ( Kyung Do Lee ),장정렬 ( Jeong Ryeol Jang ) 한국농공학회 2012 한국농공학회 학술대회초록집 Vol.2012 No.-

논은 지역이나 토양, 기후 특성, 오염원 종류, 관개 및 시비 등의 경작방법에 따라 배출 양상이 다양하며, 비점오염원관리를 위해서는 농경지내 발생원 관리가 가장 효과적으로 알려져 있다. 특히, 시비 방법 개선, 효율적인 물관리 등 다양한 영농방법 개선을 통한 비점오염원 발생 저감 방안 개발이 요구 되고 있다. 본 연구에서는 시비 방법 개선, 효율적인 물관리에 따른 비점오염 배출량 저감효과를 모니터링 및 모델링 결과를 통해 평가하고자 한다. 화학 비료 비종에 따른 비점오염 배출량 저감효과를 평가하기 위해 국립식량과학원 벼맥류부에 시험 포장을 조성하였고, 질소 무비, 맞춤형 비료 시비, 완효성 비료 시비에 따른 비점오염 배출량을 모니터링하였다. 맞춤형 대비 완효성 비료 시비 후 질소기준비점오염 배출량이 39% 저감되는 것으로 나타났다. 시비량 및 물관리에 따른 비점오염 배출량 저감효과를 평가하기 위해서 논 비점오염모형인 CREAMS-PADDY를 이용하였고, 모형의 보정을 위하여 서울대학교 이동저수지 관개논 시험포장에서 모니터링 되고 있는 자료를 이용하였다. 모형에 적용한 영농방법 시나리오는 쌀의 수량 및 품질에 영향을 미치지 않는 범위를 선정하기 선행 연구결과를 이용하였다. 모형의 보정 결과 논물 총질소 및 총인의 결정계수는 0.95, 0.84, 모형의 효율지수는 0.95, 0.73으로 비교적 높게 나타났다. 영농방법 시나리오 적용 결과 관행시비량 대비 표준시비량 시비 시 총질소는 3∼12 %, 총인은 15∼24% 감소하는 것으로 나타났고, 관행물꼬 높이 대비 물꼬를 200mm 증가시켰을 때 18∼38 % 감소하는 것으로 나타났다. 본 연구결과는 논에서의 비점오염 주요 관리인자의 상호관련성 및 배출기작을 구명하고, 비점오염배출량 저감을 위한 영농방법개선 방안 수립에 기초자료가 될 것으로 기대된다.

새만금 방조제 외해역의 저서생물 군집 변화

정지연,권효근,장정렬,최강원,Jung, Ji-Yeon,Kwon, Hyo-Keun,Jang, Jeong-Ryeol,Choi, Kang-Won 한국관개배수위원회 2010 한국관개배수논문집 Vol.17 No.2

This study was carried out to investigate the changing of benthic macrobenthos community in Saemangeum subtidal area. The distribution of macrobenthic community is important to assume the benthic environment in study area. Macrobenthic community was investigated three times in 2007 (March, June and September) in the Saemangeum subtidal area. The mean density of macrobenthos was $345{\sim}838ind./m^2$ and the most dominant taxa was benthic polychaete. Opportunistic species such as E.cordatum, T.fragilis, H.filiformis, and Tharyx sp. were shown high appearance rate in study area. The dominance of these opportunistic species suggest that the benthic environment of study area was unstable due to environmental disturbance. But, there are only few point that these species were recorded high densities, and also equilibrium species was dominant, too. It means disturbance and un stability of benthic environment in Seamangeum was not serious yet. so the dynamics and trends of these opportunistic species should be concerned.