산림논복합 소유역에서의 비점부하 강우유출 특성 및 EMC 산정

송인홍,강문성,황순호,송정헌,Song, In-Hong,Kang, Moon-Seong,Hwang, Soon-Ho,Song, Jung-Hun 한국농공학회 2012 한국농공학회논문집 Vol.54 No.4

This study was aimed to characterize non-point source (NPS) pollutant runoff and estimate event mean concentrations (EMCs) from a small rural watershed located at the headwater area of the Gyeongan stream. The study watershed consists of the two major landuse, forest (72 %) and paddy field (28 %). The nine rainfall events ranging from 18.5 to 192.6 mm in amount were monitored in this study. Stream flow was measured at the watershed outlet using a water level gauge, while a number of water samples for each event were collected and analysed for water quality. Event pollutant loads varied greatly depending on rainfall events varying from 22.6 to 3,134.2 mg/L, 0.32 to 24.56 mg/L, 0.090 to 1.320 mg/L, and 2.3 to 149.8 mg/L for SS, TN, TP, and COD, correspondently. The respective mean EMCs were estimated by 104.2, 1.00, 0.168, and 7.9 mg/L. The Pearson correlation analysis showed that COD EMC was significantly correlated with those of SS, TN, and TP. Rainfall runoff ratio appeared to be negatively correlated with EMCs of SS, TP, and COD, although not statistically significant. The event loads from the largest rainfall was greater than the sum of those from the remaining eight events. The study results suggest that the appropriate management of intensified storm events are of greater importance in curbing NPS loads, while the estimated EMCs provide base data for the unit pollutant loads determination for the forest-paddy composite upstream watershed.

Water Use Efficiency of Subsurface Drip Irrigation and Furrow Irrigation

송인홍,피터 월러,최연식,권순국,Song, In-Hong,Waller Peter. M.,Choi, C. Yeon-Sik,Kwun, Soon-Kuk The Korean Society of Agricultural Engineers 2007 한국농공학회논문집 Vol.49 No.2

The primary objective of this study was to compare water use efficiencies between subsurface drip irrigation and furrow irrigation. The uniformity of used drip lines was tested to determine if clogging would be a threat to the long-term success of a subsurface drip irrigation system. Three crops, cantaloupe, lettuce, and bell pepper, were grown in four plots for each irrigation system. Significantly less water was applied with subsurface drip irrigation than with furrow irrigation (29.5 % less for cantaloupe and 43.2 % less for bell poppet) in order to produce similar crop yields. Water use efficiencies with subsurface drip irrigation were significantly higher than those with furrow irrigation fur cantaloupe (P-value = 0.018) and bell pepper (P-value ${\leq}$ 0.001). Drip-irrigated lettuce, a shallow-rooted crop, had moderately higher water use efficiency during the first two seasons, while no difference was observed in the third season. After the experiment, the uniformity of the drip lines was 92.1 % on average and classified as good. The high values fur water use efficiency and uniformity indicate that subsurface drip irrigation can be a sustainable method for conserving irrigation water.

농촌 소하천에서의 재폭기 계수 추정

송인홍 ( Song In Hong ),권순국 ( Kwun Soon Kuk ) 한국농공학회 2001 韓國農工學會誌 : 전원과 자원 Vol.43 No.5

Reaeration phenomena, the physical process of absorption of oxygen from atmosphere, is one of the important parameters of dissolved oxygen simulation in streams. This study was aimed at predicting reaeration coefficients in rural small streams, examining the influence of drop structure on reaeration and the seasonal fluctuation of reaeration coefficients. Reaeration coefficients of five strams including four tributaries of Bokha watershed in Gyeonggi Ichon and Onyang stream in Chungnam Onyang were measured. Constant rte injection (CRI) method using propane and Rhodamine-WT as gas and dye tracer was adopted. Reaeration Coefficients ranged between 6.16 and 29.16 reciprocal day, higher than those in USGS database. Prediction equation. K₂ = CV^0.593, was regressed from the measured data at 95% confidence level, with an absolute error of 21.2% and a standard error of 4.0 reciprocal days. Reaeration coefficients of experimental reaches with drop structure showed percentile increases of 42.3 to 159.2 compared to those without it, an indication that drop structure plays and important role on stream reaeration. Taking into consideration the seasonal fluctuation of reaeration coefficients, the values measured during September and October were the highest. Mainly due to the removal of aquatic plants, by intensive rainfall during summer.

농촌지역의 유량ㆍ부하량관계식 산정

송인홍 ( Song In Hong ),박병흔 ( Park Byung Heun ),권순국 ( Kwun Sun Kuk ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-

This study was initiated to collect background pollutant data for rural watersheds. The effluent/run-off pollutant load and run-off ratio of the study areas were calculated and the two types of regression equations, L=aㆍQ+b and L=c ㆍQ^d where L and Q are the pollutant load(L) and discharge(Q), were derived. We acquired that the correlation coefficients of (he two types of regression equations were over than 90% except for BOD. Therefore, L-Q equations would be a measure to predict water quality of rural watersheds.

농촌 소하천의 재폭기 계수 추정

송인홍 ( Song In Hong ),권순국 ( Kwun Soon Kuk ) 한국농공학회 2000 한국농공학회 학술대회초록집 Vol.2000 No.-

In this study, using modified tracer method(Constant Rate Injection, CRI method), reaeration rates were measured in the territories of Bokha stream. In case of Kwanri stream, reaeration rates of a diversion were measured simultaneously. Propane gas and Rhodamine-WT were used as gas and dye tracer, respectively. The experimental results show that reaeration rates of the stream were ranged from 6.16 to 24.52 1/day and those of a diversion in Kwanri stream were ranged from 28.39 to 123.61 1/day. It is resulted that mean velocity of stream is a dominant factor in reaeration process and diversion significantly influence on reareation process.

농촌유역 모형의 모의요소별 적용기법

송인홍 ( Song In-hong ),강문성 ( Gang Mun-seong ),김진택 ( Kim Jin-taek ) 한국농공학회 2012 韓國農工學會誌 : 전원과 자원 Vol.54 No.1

Sentinel-2 위성영상을 이용한 하계 논벼와 동계작물 재배 필지 분류 및 정확도 평가

홍주표 ( Hong Joo-pyo ),장성주 ( Jang Seong-ju ),박진석 ( Park Jin-seok ),신형진 ( Shin Hyung-jin ),송인홍 ( Song In-hong ) 한국농공학회 2022 한국농공학회논문집 Vol.64 No.1

Up-to-date statistics of crop cultivation status is essential for farm land management planning and the advancement in remote sensing technology allows for rapid update of farming information. The objective of this study was to develop a classification model of rice paddy or winter crop fields based on NDWI, NDVI, and HSV indices using Sentinel-2 satellite images. The 18 locations in central Korea were selected as target areas and photographed once for each during summer and winter with a eBee drone to identify ground truth crop cultivation. The NDWI was used to classify summer paddy fields, while the NDVI and HSV were used and compared in identification of winter crop cultivation areas. The summer paddy field classification with the criteria of -0.195<NDWI<0.15 was 90.9% accurate on average when compared with ground truth. Model performance for the winter crop field classification was also excellent showing the accuracy greater than 98.2% on average for both models. However, cloud and greenhouses appeared to demonstrate optical similarity with paddy in the NDWI values, implying additional caution should be taken when removing cloud and greenhouse effects. Overall the developed methods for paddy and winter crop classification performed reasonably well at the irrigation district level and further studies are needed to investigate model performance at regional or national scales.

Irrigation with Microbial-Contaminated Water and Risk of Crop Contamination

최연식,송인홍,권순국,Choi, C. Yeon-Sik,Song, In-Hong,Kwun, Soon-Kuk The Korean Society of Agricultural Engineers 2007 한국농공학회논문집 Vol.49 No.2

The aim of this study was to compare crop contamination between two irrigation methods using microbial-contaminated water. The effect of relative humidity on microbial survival of the three indicator microorganisms was also investigated. Escherichia coli ATCC 25922, Clostridium perfringens ATCC 3624, and coliphage PRD1 were applied to irrigation water to grow cantaloupe, lettuce, and bell pepper. Half of the sixteen plots were subsurface drip irrigated (SDI) and the other half were furrow irrigated (FI). Two relative humidity levels were controlled at 15-65 % and 55-80 % for the dry and humid condition experiments, respectively. Samples of produce, surface soil, and subsurface soil at a depth of 10 cm were collected over a two-week period following the application of the study microorganisms. Overall, greater contamination of both produce and soil occurred in the FI plots. For the SDI plots, preferential water paths and resulting water appearance on the seed beds seemed to be responsible for produce contamination. Relative humidity levels did not appear to affect microbial survival in soil. PRD 1 showed lower inactivation rates than 5. coli in both dry and humid conditions. C. perfringens did not experience significant inactivation over the experimental period, suggesting this microorganism can be an effective indicator of fecal contamination.

하천 수질에 대한 어류의 서식처적합도지수 산정 - 피라미를 대상으로 -

홍록기 ( Hong Rokgi ),박진석 ( Park Jinseok ),장성주 ( Jang Seongju ),송인홍 ( Song Inhong ) 한국농공학회 2021 한국농공학회논문집 Vol.63 No.6

The conservation of stream habitats has been gaining more public attention and fish habitat suitability index (HSI) is an important measure for ecological stream habitat assessment. The fish habitat preference is affected not only by physical stream conditions but also by water quality of which HSI was not available due to the lack of field data. The purpose of this study is to estimate the HSI of Zacco platypus for water quality parameters of water temperature, dissolved oxygen (DO), and biochemical oxygen demand (BOD) using the water environment monitoring data provided by the Ministry of Environment (ME). Fish population data merged with water quality were constructed by spatio-temporal matching of nationwide water quality monitoring data with bio-monitoring data of the ME. Two types of the HSI were calculated by the Instream Flow and Aquatic Systems Group (IFASG) method and probability distribution (Weibull) fitting for the four major river basins. Both the HSIs by the IFASG and Weibull fitting appeared to represent the overall distribution and magnitude of fish population and this can be used in stream fish habitat evaluation considering water quality.

축분종류에 따른 가축분퇴비의 화학성분 특성분석

안지현,송인홍,강문성,Ahn, Ji-Hyun,Song, In-Hong,Kang, Moon-Seong 한국농공학회 2013 한국농공학회논문집 Vol.55 No.2

The aim of this study was to investigate chemical characteristic of livestock compost in association with livestock manure types (poultry, cattle, swine, and mixed manure). The livestock compost was collected from local nonghyup branches on a si-gun level. Chemical composition (nutrients, heavy metals etc.) of the samples was analyzed and Pearson's correlation analysis was performed. Quality of most compost samples met the standard of fertilizer specifications. Poultry compost contains greater nutrients especially $P_2O$ (p-value<0.01) and $NH_4$-N (p-value<0.05). Meanwhile swine compost has higher concentration in water content (p-value<0.05) and heavy metals (p-value<0.01 for Cd, Cu and Zn). Overall, poultry compost was correlated positively with nutrients while swine compost has positive correlation with water content and heavy metals. We expect that the study results can provide base data for determining compost types and amount for crop production.