연단위 관개효율 변화를 고려한 관개지구 용수 공급량 모의

송정헌,송인홍,김진택,강문성,Song, Jung Hun,Song, Inhong,Kim, Jin Taek,Kang, Moon Seong 한국수자원학회 2015 한국수자원학회논문집 Vol.48 No.6

The objective of this study was to evaluate simulation of agricultural water supply considering yearly variation of irrigation efficiency. The water supply data of the Idong reservoir from 2001 through 2009 was collected and used for this study. Total 6 parameters including irrigation efficiency (Es), drainage outlet height, and infiltration, were used for sensitivity analysis, calibration, and validation. Among the parameters, the Es appeared to be the most sensitivity parameter. The Es was calibrated on a yearly basis considering sensitivity and time-varying characteristic, while other parameters were set to fixed values. The statistics of percent bias (PBLAS), Nash-Sutcliffe efficiency (NSE), and root means square error to the standard deviation of measured data (RSR) for a monthly step were 2.7%, 0.93, and 0.26 for the calibration, and 3.9%, 0.89, and 0.32 for the validation, correspondently. The results showed a good agreement with the observations. This implies that the modeling only with appropriate parameter values, apart from modeling approaches, can simulate the real supply operation reasonably well. However, the simulations with uncalibrated parameters from previous studies produced poor results. Thus, it is important to use calibrated values, and especially, we suggest the Es's yearly calibration for simulating agricultural water supply.

복합영농 관개지구의 배수량 모의 모형의 개발

송정헌,강문성,송인홍,황순호,박지훈,안지현,Song, Jung-Hun,Kang, Moon-Seong,Song, Inhong,Hwang, Soon-Ho,Park, Jihoon,Ahn, Ji-Hyun 한국농공학회 2013 한국농공학회논문집 Vol.55 No.3

The objectives of this study were to develop a hydrologic simulation model to estimate surface drainage for irrigation districts consisting of paddy and protected cultivation, and to evaluate the applicability of the developed model. The model consists of three sub-models; agricultural supply, paddy block drainage, and protected cultivation runoff. The model simulates daily total drainage as the sum of paddy field drainage, irrigation canal drainage, and protected cultivation runoff at the outlets of the irrigation districts. The agricultural supply sub-model was formulated considering crop water requirement for growing seasons and agricultural water management loss. Agricultural supply was calculated for use as input data for the paddy block sub-model. The paddy block drainage sub-model simulates paddy field drainage based on water balance, and irrigation canal drainage as a fraction of agricultural supply. Protected cultivation runoff is calculated based on NRCS (Natural Resources Conservation Service) curve number method. The Idong reservoir irrigation district was selected for surface drainage monitoring and model verification. The parameters of model were calibrated using a trial and error technique, and validated with the measured data from the study site. The model can be a useful tool to estimate surface drainage for irrigated districts consisting of paddy and protected cultivation.

저수지 관개 광역 논의 영양물질 수지 분석

송정헌,강문성,송인홍,황순호,박지훈,전상민,김계웅,장정렬,Song, Jung-Hun,Kang, Moon-Seong,Song, Inhong,Hwang, Soon-Ho,Park, Jihoon,Jun, Sang-Min,Kim, Kye-Ung,Jang, Jeong-Ryeol 한국농공학회 2013 한국농공학회논문집 Vol.55 No.6

The objective of this study was to investigate the nutrient load balance in the reservoir irrigated paddy block during growing seasons. Idong reservoir irrigation paddy block of 10.3 ha in size was selected to collect hydrologic and water quality data. Irrigation, canal flows, and paddy field drainage were measured using a water level gauge, while water samples were collected and analysed for water quality. The water balance analysis showed that 81 % and 75 % of total outflow were through paddy and irrigation canal drainage during 2011 and 2012, respectively. The water quality of paddy field drainage varied greatly depending on rice cultivation stage ranging from 0.05 to 24.55 mg/L and from 0.01 to 0.76 mg/L for T-N and T-P, correspondently. Paddy field drainage loads during May through June account for 64 % and 76 % in 2012 and 2013, while 82 % and 81 % for T-P in 2011 and 2012, respectively. The Pearson correlation analysis showed that rainfall was significantly correlated with nutrient loads during July through August due to runoff, and irrigation was related with nutrient loads of drainage during some period of July through September due to irrigation return flow. This study results showed characteristics of inflow and outflow nutrient loads from plentiful irrigated paddy block.

저수지 관개지구의 농업용수 회귀 특성 분석

송정헌,송인홍,김진택,강문성,Song, Jung Hun,Song, Inhong,Kim, Jin-Taek,Kang, Moon Seong 한국농공학회 2015 한국농공학회논문집 Vol.57 No.1

The objective of this study was to investigate characteristics of irrigation return flow from paddy block in a reservoir irrigated district during growing seasons. The irrigation return flow was divided into three parts, quick return flow from irrigation canal (RFI), quick return flow from drainage canal (RFD), and delayed return flow (DRF). The RFI was calculated from water level and stage-discharge relationships at the ends of the irrigation canals. The DRF was estimated using measured infiltration amount from paddy fields of the irrigated district. A combined monitoring and modeling method was used to estimate the RFD by subtracting surface runoff from surface drainage. The paddy block irrigated from the Idong reservoir was selected to study the irrigation return flow components. The results showed that daily agricultural water supply (AWS), the RFI, and the RFD were $27.4mm\;day^{-1}$, $4.9mm\;day^{-1}$, and $19.8mm\;day^{-1}$, respectively in May, which were greater than other months (p<0.05). The return flow ratio of the RFI and the RFD were the greatest in July (34.6%) and May (72.3%), respectively. The daily AWS was closely correlated with the RFD (correlation coefficients of 0.76~0.86) in except for July with, while correlation coefficient with the RFI were 0.56 and 0.42 in June and July, respectively (p<0.01). The total irrigation return flow was 1,965 mm in 2011, and 1,588 mm in 2012, resulting in total return flow ratio of 84.6% and 79.1%, respectively. This results indicate that substantial amounts of agricultural water were returned to streams as irrigation return flow. Thus, irrigation return flow should be fully considered into the agricultural water resources planning in Korea.

COMFARM을 이용한 농업용저수지 유역 수문 모델링

송정헌,박지훈,김계웅,류정훈,전상민,김진택,장태일,송인홍,강문성,Song, Jung-Hun,Park, Jihoon,Kim, Kyeung,Ryu, Jeong Hoon,Jun, Sang Min,Kim, Jin-Taek,Jang, Taeil,Song, Inhong,Kang, Moon Seong 한국농공학회 2016 한국농공학회논문집 Vol.58 No.3

The component-based modeling framework for agricultural water-resources management (COMFARM) is a user-friendly, highly interoperable, lightweight modeling framework that supports the development of watershed-specific domain components. The objective of this study was to evaluate the suitability of the COMFARM for the design and creation of a component-based modeling system of agricultural reservoir watersheds. A case study that focused on a particular modeling system was conducted on a watershed that includes the Daehwa and Dangwol serial irrigation reservoirs. The hydrologic modeling system for the study area was constructed with linkable components, including the modified Tank, an agricultural water supply and drainage model, and a reservoir water balance model. The model parameters were each calibrated for two years, based on observed reservoir water levels. The simulated results were in good agreement with the observed data. In addition, the applicability of the COMFARM was evaluated for regions where reservoir outflows, including not only spillway release but also return flow by irrigation water supply, substantially affect the downstream river discharge. The COMFARM could help to develop effective water-management measures by allowing the construction of a modeling system and evaluation of multiple operational scenarios customized for a specific watershed.

미처리하수지구 논에서의 수질 및 토양 특성 분석

송정헌,정한석,박지훈,송인홍,강문성,박승우,Song, Jung Hun,Jeong, Han Seok,Park, Ji Hoon,Song, In Hong,Kang, Moon Seong,Park, Seung Woo 한국농공학회 2014 한국농공학회논문집 Vol.56 No.6

The objectives of this study were to monitor and analyse water quality and soil property in paddy fields where untreated wastewater is irrigated. Three paddy fields where streamflow mixed with untreated wastewater has been irrigated (untreated wastewater district, UWD) were selected for monitoring, and five paddy fields in Yongin area (Yongin district, YID) where water from Idong agricultural reservoir (well-managed) has been irrigated were selected for comparative evaluation. Electronic conductivity (EC), suspended solids (SS), total nitrogen (T-N), total phosphorous (T-P), $NO_3-N$, $Ca^{2+}$, $Mg^{2+}$, $Na^+$, total coliform (TC), fecal coliform (FC), and E. coli of the irrigation water in the UWD were significantly higher than those in the YID. Relatively high concentrations of EC, T-N, T-P, TC, FC, E. coli, copper (Cu), lead (Pb), zinc (Zn), and aluminium (Al) were shown in the irrigation water of the UWD especially during May to June. In general, the paddy soil in the UWD contained more Pb, Zn, and Cu than in the YID although the soil heavy metal contents in the UWD still meet the Korean soil contamination warning standards. No temporal trends in the heavy metal concentrations were found in paddy soils of the UWD. This study showed that the use of untreated wastewater to paddy fields has the possibility of negative impacts on water quality and soil, although long-term monitoring is needed to fully evaluate its effects.

통합 물환경 평가를 위한 수량지표 조사

송정헌 ( Jung-hun Song ),김학관 ( Hakkwan Kim ),최지용 ( Ji Yong Choi ) 한국농공학회 2023 한국농공학회 학술대회초록집 Vol.2023 No.0

국가물관리기본계획에서는 물관리 추진전략으로 물환경의 자연성 회복을 공표하고 있다. 물환경 관리 기준 및 관리체계 개선을 위해서는 수질·수생태계·수량의 통합 관리체계 마련 및 관리지표 기반 평가가 필요하하며, 이를 위한 세부 지표는 수질지표, 수생태계지표, 수량지표 등으로 구분할 수 있다. 그 중 수량지표는 수질 및 수생태지표와 중복성이 없어야 하며 수질지표가 좋은 수질을 평가하고, 수생태지표는 건강한 수생태를 평가한다면 수량지표는 자연에 가까운 건전한 유황을 유지하고 있는지를 평가할 수 있어야 할 것이다. 본 연구에서는 유역 물환경 평가를 위해, 자연성 회복 및 건전한 유황 개념을 포함하는 유량기준을 조사하고 수량지표(안)을 제안하고자 한다. 수량지표 제안을 위한 첫 단계로 우리나라 대표적인 유량기준 하천유지유량과 환경생태유량의 현황을 비교·분석하였다. 조사 결과, 하천유지유량과 환경생태유량 모두 자연성 회복을 위한 유량개념을 포함하고 있는 것으로 조사되었다. 자연성 회복을 고려하기 위해서는 하천의 평상시 유황을 반영할 필요가 있으며, 수문학적 방법이 현실적인 방안인 것으로 조사되었다. 두 번째 단계로는유량기준 현황을 바탕으로 월별 Q50, Aquatic Base Flow 등의 유량기준 후보를 선정하여 제시하였으며, 세 번 째로는 물환경 상태를 평가하기 위해서 생태학적 가문 분류 기반의 등급을 선정하였다. 마지막으로 이러한 유량기준과 유량등급을 기반으로 물환경을 정량적으로 평가하는 수량 지표를 제안하였다. 제안된 통합 물환경 평가 수량지표(안)은 가평교, 양양대교, 선산 지점을 대상유역으로 선정하여 그 적용성을 평가하였다. 평가 결과, 월별 유량의 특성을 반영한 유량 기준은 현재의 유량이 과거 평균에서 얼마나 이상치를 보이는지를 평가할 수 있으므로 수량지료로서의 의미를 충분히 가질 것으로 사료된다. 또한, 생태학적 가뭄 분류 기반의 평가 등급을 통해 자연에 가까운 건전한 유황 여부를 평가할 수 있었다. 본 연구에서 제안하고 있는 수량지표(안)은 향후 전문가 의견 수렴 과정 등을 통해 추가 조사 및 보완이 필요할 것 사료되며, 향후 통합 물관리 평가를 위한 관리지표로 이용될 수 있기를 기대한다.

양식 수산물 브랜드화의 기능과 전략 구축 방안

송정헌(Jung-Hun SONG) 한국수산해양교육학회 2020 수산해양교육연구 Vol.32 No.2

저수지 수위 자료와 전문가 지식을 연계한 유입량 및 방류량 추정 프레임워크

송정헌 ( Jung-hun Song ),김학관 ( Hakkwan Kim ),허용구 ( Younggu Her ),강문성 ( Moon-seong Kang ) 한국농공학회 2022 한국농공학회 학술대회초록집 Vol.2022 No.-

저수지 유입량과 방류량 산정은 효율적인 저수지 관리를 위한 중요한 요소로 물수지 분석을 기반으로 한 후속 분석의 기초자료로 이용되기 때문에 대상지역의 유역특성을 반영한 정확한 값의 이용이 중요하다. 하지만 저수지 유입량의 산정은 측정으로는 현실적으로 불가능하다. 일부 저수지에서는 저수지 상류에서 흘러들어오는 주요 하천에 대해 유량을 실시간으로 측정하는 경우가 있으나, 모든 저수지를 대상으로 현실적인 한계가 있다. 설령 주요 하천의 유량을 측정했을지라도, 저수지 유입량은 그 저수지로 유입되는 모든 지류에서 수량을 포함하는 개념이기에 오차가 발생할 수밖에 없다. 저수지 방류량은 수자원공사에서 관리하는 대규모 댐의 경우 측정이 이루어지나, 농어촌공사에서 관리하는 중소규모 저수지에서는 측정하지 않는 경우가 대다수이다. 한편, 농어촌공사에서는 유효저수량 10만톤 이상 저수지에 대해 수위 계측기를 설치하여 수위 자료를 관측하고 있으며, 이는 수위-내용적 곡선을 통해 저수량으로 변환할 수 있다. 하지만, 저수지 유입량과 방류량은 여전히 미지수이며, 이는 방정식의 수는 한 개(저수지 물수지 식)이나 미지수의 수는 두 개(유입량과 방류량)인 부정정 문제이다. 저수지 유입량과 방류량 자료가 확보되지 않은 경우, 전문가 지식을 이용하여 저수지 수위의 변화를 분석하면 유입량과 방류량을 예측하기 위한 정보를 제공할 수 있다. 본 연구에서는 국내에서 용이하게 취득할 수 있는 저수지 수위 자료로부터 유입량과 방류량을 예측하는 프레임워크를 개발하였다. 개발된 프레임워크에서는 저수지 운영에 관한 전문가 지식을 이용하여 부정정 방정식을 특정 구간에 대한 정정 방정식으로 변환하였으며, 이와 같이 부분적으로 확보된 유입량 자료를 수문모델링 기술과 연계하여 연속적인 유입량과 방류량 자료로 재구성함으로써 부정정 문제를 해결하였다. 개발된 프레임워크는 실무에서 관행적으로 사용하던 매개변수 지역화식 기반 추정 방법을 대체하여 농업용 저수지 운영에 활용될 수 있을 것으로 기대된다.

부산 어묵 가공업의 클러스터 조성 방안에 관한 연구

송정헌 ( Jung Hun Song ) 한국수산경영학회 2012 수산경영론집 Vol.43 No.2

This study aimed to examine the establishment of fish-paste processing industrial cluster in Busan. In order to successfully promote the fish-paste processing industrial cluster in Busan, first of all, it is required to implement various fish-paste processing related infra-structures and foundations. In addition to this, the agreements among fish-paste processing related organizations and businesses are inevitable to secure plans of inter-working with fisheries policies, to make efficient conditions for the stable supply of raw materials, and to pursue various supports from central and local governments for a viable development of fish-paste processing business companies in Busan.