장성호 수자원 이용 패턴

윤광식 ( Yoon Kwang-sik ),한국헌 ( Han Kuk-heon ),윤석군 ( Yoon Suk-gun ),정재운 ( Jung Jae-woon ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-

The Water resources utilization pattern of Jangsung reservoir was studied. The observed precipitation and existing reservoir operation data such as irrigation amount, reservoir storage, river maintenance requirement, flood control discharge were collected for ten years period and analyzed. Major findings of this study are as follows: The observed average, minimum, maximum annual precipitation were 905.1mm, 1,977.3mm, 1,554.3mm during study period, respectively. The average annual irrigation amount was 554.5mm, irrigation amount of drought years of '92 and '94 was 604.6mm, 679.2mm, respectively. However, irrigation amount of extended drought year '95 was 384.9mm. It showed that supplying capacity of Jangsung reservoir was limited when consecutive 2 year drought occurred. The main water resources usage of Jangsung reservoir was irrigation, but flood control discharge exceed irrigation amount exceptionally when high precipitation occurred. The reservoir operation record revealed that discharge for river maintenance was delivered even drought years.

영산강 IV단계 사업지구 밭관개 실태조사

윤광식,김영주,윤석군,한국헌,김진택,Yoon Kwang Sik,Kim Young Joo,Yoon Suk Gun,Han Kuk Heon,Kim Jin Taek 한국관개배수위원회 2004 한국관개배수논문집 Vol.11 No.2

To devise better development plan, survey was conducted about current farmer's irrigation management on upland in the YoungSan River Irrigation Project District IV. Major upland crops are garlic and onion in this region. Currently, upland irrigation has b

수문모니터링과 물수지법을 이용한 농업용 저수지 유역 유출곡선번호 추정

윤광식,김영주,윤석군,정재운,한국헌,Yoon, Kwang-Sik,Kim, Young-Joo,Yoon, Suk-Gun,Jung, Jae-Woon,Han, Kuk-Heon 한국농공학회 2005 한국농공학회논문집 Vol.47 No.3

The rainfall-runoff potential of Jangseong reservoir watershed was studied based on SCS (Soil Conservation Service, which is now the NRCS, Natural Resources Conservation Service, USDA) runoff curve number (CN) technique. Precipitation and reservoir operation data had been collected. The rainfall-runoff pairs from the watershed for ten years was estimated using reservoir water balance analysis using reservoir operation records. The maximum retention, S, for each storm event from rainfall-runoff pair was estimated for selected storm events. The estimated S values were arranged in descending order, then its probability distribution was determined as log-normal distribution, and associated CNs were found about probability levels of Pr=0.1, 0.5, and 0.9, respectively. A subwatershed that has the similar portions of land use categories to the whole watershed of Jangseong reservoir was selected and hydrologic monitoring was conducted. CNs for subwatershed were determined using observed data. CNs determined from observed rainfall-runoff data and reservoir water balance analysis were compared to the suggested CNs by the method of SCS-NEH4. The $CN_{II}$ measured and estimated from water balance analysis in this study were 78.0 and 78.1, respectively. However, the $CN_{II}$, which was determined based on hydrologic soil group, land use, was 67.2 indicating that actual runoff potential of Jangseong reservoir watershed is higher than that evaluated by SCS-NEH4 method. The results showed that watershed runoff potential for large scale agricultural reservoirs needs to be examined for efficient management of water resources and flood prevention.

Pollutant Load Characteristics of a Rural Watershed of Juam Lake

한국헌,윤광식,정재운,윤석군,김영주,Han, Kuk-Heon,Yoon, Kwang-Sik,Jung, Jae-Woon,Yoon, Suk-Gun,Kim, Young-Joo The Korean Society of Agricultural Engineers 2005 한국농공학회논문집 Vol.47 No.3

A monitoring study has been conducted to identify hydrologic conditions, water quality and nutrient loading characteristics of small watershed in Juam Lake. Climate data of the watershed were collected; flow rate was measured and water quality sampling was conducted at the watershed outlet for this study. Water quality data revealed that T-P concentrations meet I grade of lake water quality standard during non-storm period, but degraded up to II-III grade of lake water quality standard during storm period. The observed T-N concentrations always exceeded lake water quality standard. Therefore, T-P was identified as limiting chemical constituent for eutrophication of Juam Lake. T-P concentration of non-storm period also revealed that point source pollution is not serious in the watershed. Three year monitoring results showed that the observed T-N losses were $10.85\~18.88$ kg/ha and T-P losses were $0.028\~0.323$ kg/ha during six month (Mar. - Oct.), respectively. Major portion of runoff amount discharged by a few storm events a year and nutrient load showed apparent seasonal variation. Huge runoff amounts were generated by intense storms, which make application of water treatment or detention facilities ineffective. Monitoring results confirmed that water quality improvement by abating nonpoint source pollution in rural watershed of monsoon climate should be focused on source control. T-P losses from paddy field seemed to consist of significant amount of total load from study watershed. Therefore, management of drainage from paddy field is considered to be important for preventing algal blooming problem in Juam Lake.

간척지 논 침수 원인 조사와 방재 대책 수립

정주홍,윤광식,최수명,윤석군,고영배,김영택,Jeong, Ju-Hong,Yoon, Kwang-Sik,Choi, Soo-Myung,Yoon,, Suk-Gun,Go, Young-Bae,Kim, Young-Taek 한국관개배수위원회 2010 한국관개배수논문집 Vol.17 No.2

Tidal land reclamation provided water resources and land for agriculture and contributed stable crop production. However, climate change by global warming disrupts the hydrologic circulatory system of the earth resulting in sea level rise and more frequent flood for reclaimed arable land. Recently, Suyu reclaimed paddy field in Jindo-gun experienced prolonged inundation after heavy rainfall and there is a growing risk of flood damage. Onsite survey and flood analysis using GATE_Pro model of Korea Rural Corporation were conducted to investigate causes of flooding. To perform the analysis, input data such as inflow hydrograph, the lowest elevation of paddy field, neap tide level, management level of Gunnae estuary lake at the time of the flood were collected. Flood analysis confirmed that current drainage facilities are not enough to prevent 20year return period flood. The result of analysis showed flooding more than 24hours. Therefore, flood mitigation alternatives such as sluice gate expansion, installation drainage pumping station, refill paddy land, and catch canal were studied. Replacing drainage culvert of Suyu dike to sluice gate and installing drainage pumping station at the Gunne lake were identified as an effective flood control measures. Furthermore, TM/TC (SCADA) system and expert for gate management are required for the better management of drainage for estuary dam and flood mitigation.

비우량 방법에 의한 논 오염부하 원단위 산정시 적용성 평가

정재운 ( Jae Woon Jung ),윤광식 ( Kwang Sik Yoon ),윤석군 ( Suk Gun Yoon ),최우정 ( Woo Jung Choi ),최우영 ( Woo Young Choi ),허유정 ( Yu Jeong Huh ),조경민 ( Kyeong Min Cho ),홍정진 ( Jung Jin Hong ) 한국물환경학회 2009 한국물환경학회지 Vol.25 No.6

슬러리점토의 압밀특성

정규향(Cheong, Gyu Hyang),정종진(Cheong, Jong Jin),김교준(Kim, Gyo Jun),윤석군(Yoon, Suk Gun) 한국해안해양공학회 2005 한국해안해양공학회 논문집 Vol.17 No.1

매립재로 이용되는 준설점토는 일반적으로 함수비가 매우 크며, 작은 압밀하중이 작용하더라도 큰 침하가 일어나는 특성을 지닌다. 이러한 초연약지반을 개량하는 공법설계를 위해서는 압밀특성을 구하는 실험이 실시되어야 한다. 그러나 일반적인 표준압밀시험방법으로는 슬러리상태의 흙이 압밀링의 벽면을 타고 상하부로 흘러나오기 때문에 실험이 불가능하다. 따라서, 본 연구에서는 Rowe cell 시험기를 사용하여 준설점토에 대한 압밀시험을 실시하였으며, 함수비의 변화가 압밀특성에 주는 영향을 검토하기 위해서 함수비를 100%, 110%, 120%, 133%, 150% 등 5종류로 변화시켜서 실험을 실시하였다. 실험결과로부터 준설매립지반의 개량을 위한 설계를 하는 경우, 실제 압밀시험을 하지 않고도, 현장 함수비가 측정되면 개략적인 압축지수와 압밀계수 및 변형률을 예측할 수 있는 식을 제안하였다. Dredged soil from sea has much higher water content than liquid limit of clay and even if small loads apply, it will suffer a great settlement. Therefore it is very difficult to perform a consolidation test with general consolidation apparatus because of high water content. In this study Rowe cell apparatus consolidation tests have been performed with 5 slurry clays of a water content of 100%, 110%, 120%, 133%, and 150%. From the test results the consolidation characteristics such as compression index, secondary compression index, consolidation coefficient, and strain have been investigated with a variation of water content of dredged soil. The equations to get consolidation constants such as a compression index, a coefficient of consolidation, and strain have been proposed with the field water content.