국제회의 참가기 - 일본 수문.수자원학회 학술발표회 참가기

노재경,Noh, Jae-Kyung 한국관개배수위원회 2011 한국관개배수회지 Vol.47 No.-

홍수조절용량 설정에 따른 증고저수지의 용수공급능력 변화

노재경,Noh, Jae-Kyoung 한국관개배수위원회 2010 한국관개배수논문집 Vol.17 No.2

This study was performed to analyze the affect of water supply capacity followed by allocating flood control volume in heightening reservoir, of which Baekgog reservoir was selected as a case study in here. Baekgog reservoir is located in Jincheon county, Chungbuk province, of which full water level will be heightened from EL. 100. 1m to EL. 102.1m, and total storage from 21.75M $m^3$ to 26.67M $m^3$. Flood inflow with 200year frequency was estimated to 997 $m^3$/s in peak flow and 22.54M $m^3$ in total volume. Reservoir flood routing was conducted to determine flood limited water levels, which was determined to have scenarios such as EL 97-98-99m in periods of 6.21.-7.20., 7.21.-8.20., and 8.21.-9.20., respectively, EL 97-97-97m, EL 98-98-98m in present reservoir, and EL 99-100-101m, EL 99-99-99m, and EL 100-100-100m in heightened reservoir. Reservoir inflow was simulated by DAWAST model. Annual paddy irrigation requirement was estimated to 33.19M $m^3$ to 2,975ha. Instream flow was allocated to 0.14mm/d from October to April. Operation rule curve was drawn using inflow, irrigation and instream flow requirements data. In case of withdrawal limit reservoir operation using operation rule curve, reduction rates of annual irrigation supply before and after flood control by reservoir were 2.0~4.3% in present size and 1.5~3.6% in heightened size. Reliability on water supply was decreased from 77.3% to 63.6~68.2% in present size and from 81.6% to 72.7~79.5% in heightened size. And reduction rates of water storage at the end of year before and after flood control by reservoir were 7.3~16.5% in present size and 7.7~16.9% in heightened size. But water supplies were done without any water deficiency through withdrawal limit reservoir operation in spite of low flood regulating water level.

저수량 오차에 의한 장찬저수지의 유역외 유입량 추정

노재경,Noh, Jae-Kyoung 한국농공학회 2010 한국농공학회논문집 Vol.52 No.5

Jangchan reservoir is located in Okcheon county, Chungbuk province, of which watershed area is $29.4\;km^2$ from outside, and $5.1\;km^2$ from inside watershed, effective storage capacity is $392{\times}10^4\;m^3$, paddy area to be irrigated is 474 ha. To determine inflows from Keumcheon weir located in outside watershed on an optimum level, a repeated procedure which is composed of simulation of inflows to Keumcheon weir, setting of range of water taking at Keumcheon weir, simulation of inflows to Jangchan reservoir, estimation of paddy water from Jangchan reservoir, and simulation of water storages in Jangchan reservoir was selected. Parameters of DAWAST model for simulating inflows to Jangchan reservoir were determined to UMAX of 315 mm, LMAX of 21 mm, FC of 130 mm, CP of 0.018, and CE of 0.007 with absolute sum of errors in reservoir water storages minimized using unconstrained Simplex method because of no inflows data. Inflows to Keumcheon weir were simulated to $2,132{\times}10^4\;m^3$ on an annual average. Optimal range of water taking at Keumcheon weir to transfer to Jangchan reservoir were $0.81{\sim}50\;mm/km^2/d$, which were summed up to $1,397{\times}10^4\;m^3$ in 66% of total on an annual average. Inflows to Jangchan reservoir were simulated to $1,739{\times}10^4\;m^3$ on an annual average of which were 80 % from Keumcheon weir of outside watershed. Requirements to paddy water from Jangchan reservoir were estimated to $543{\times}10^4\;m^3$ on an annual average.

유역배율이 작은 저수지의 이수관리방법

노재경,Noh, Jae-Kyoung 한국관개배수위원회 2011 한국관개배수논문집 Vol.18 No.1

To provide a operation rule curve for reservoir with low ratio of watershed area to paddy field area, Duckyong reservoir with watershed area of $15.8km^2$ and paddy field area of 1,071ha was selected, in which 4 meters are being heightened and full water levels will be increased from EL.26.0m to EL.30.0m, total water storages from 365.6M $m^3$ to 708.0M $m^3$. There was no operation rule curve that satisfied over 90% reliability of water supply in reservoir with watershed area of 1.48 times of paddy field area. The differences between observed and simulated reservoir daily water storages were minimized to determine parameters for simulating reservoir inflow in case of paddy field area of 550ha from 1991 to 2010. A operation rule curve was drawn to have a maximum storage with total water storage, which was in paddy field area of 700ha with ratio of 2.3 between watershed area and paddy field area. This case showed that annual irrigation water supply was 668M $m^3$ and instream flow of 57M $m^3$, water supply reliability of 55.6% in normal operation, and annual irrigation water supply was 605M $m^3$ and instream flow of 38M $m^3$, water supply reliability of 95.6% in withdrawal limited operation. Water supply reliabilities showed 35.6% without flood regulation and 17.8% with flood regulation in existing reservoir before heightening.

유역외 보의 연계운영에 의한 유역배율이 작은 저수지의 유입량 확보 가능성

노재경,Noh, Jae-Kyoung 한국농공학회 2011 한국농공학회논문집 Vol.53 No.1

This study was performed to ascertain the possibility of securing inflows to reservoir with low ratio of watershed to paddy field areas by outside diversion weir. The case of Maengdong reservoir and Samryong diversion weir was selected. Most of inflows to Maengdong reservoir with watershed area of $7.06\;km^2$ and total storage capacity of $1,269{\times}10^4\;m^3$ are filled with intake water from outside Samryong diversion weir. Only using water storage data in Maengdong reservoir from 1991 to 2009, the range of water intake in Samryong diversion weir to Maengdong reservoir was optimized to 0.135~30 mm/d, from which water intake to Maengdong reservoir was $1,672.9{\times}10^4\;m^3$ (70.1 %) and downstream outflow to Weonnam reservoir was $714.4{\times}10^4\;m^3$ (29.9 %). The parameters of DAWAST model for reservoir inflow were determined to UMAX of 313.8 mm, LMAX 20.3 mm, FC 136.8 mm, CP 0.018, and CE 0.007. Inflows to Maengdong reservoir were $427.1{\times}10^4\;m^3$ (20.3 %) from inside watershed, and $1,672.9{\times}10^4\;m^3$ (79.7 %) from outside. Paddy irrigation water requirements were estimated to $1,549{\times}10^4\;m^3$ on annual average. Operation rule curve was drawn by using daily inflow and irrigation requirement data. By securing the amount of inflow to Maengdong reservoir to about 80 % from outside Samryong diversion weir, water supply capacity for irrigation of $1,549{\times}10^4\;m^3/yr$ was analyzed to be enough. Additional water supplies for instream flow were analyzed to $1,412\;m^3/d$ in normal reservoir operation, $36,000\;m^3/d$ in withdrawal limit operation by operation rule curve from October to March of non irrigation period.

유역배율에 따른 저수지의 하천유지용수 공급량

노재경(Jaekyoung Noh),이재남(Jaenam Lee) 충남대학교 농업과학연구소 2011 Korean Journal of Agricultural Science Vol.38 No.2

To provide variation of water supply for instrearn flow from reservoirs with various magnifications of paddy irrigation area to watershed area, 8 reservoirs were selected to draw operation rule curve and to analyze water supplies from reservoirs. Reliability of 90% for supplying irrigation water from reservoir was able to maintain and instream flow water was able to be supplied only in the reservoir with maginification of paddy irrigation area to watershed area above 3. The more magnification of paddy irrigation area to watershed area increased, the more ratio of irrigation water to total water storage decreased, and the more ratio of instream flow water to total water storage increased. From the heightening 113 reservoirs in Korea, annual irrigation water was estimated to 1,146.05 Mm³ in normal operation, 839.57 Mm³ in withdrawal limited operation, and annual instream flow water was estimated to 149.68 Mm³ in normal operation, 283.19 Mm³ in withdrawal limited operation. It was concluded that withdrawal limited operation was followed to have the premise of saving irrigation water, more instream flow water was able to be supplied from reservoirs with high magnification of paddy irrigation area to watershed area.

저수지 수위와 방류량이 저수지 유입량 산정에 미치는 영향

노재경 ( Jackyoung Noh ),이재남 ( Jaenam Lee ),김윤호 ( Yunho Kim ),서광석 ( Kwangseok Seo ) 한국농공학회 2008 한국농공학회 학술대회초록집 Vol.2008 No.-

In order to analyze the effect of calculating reservoir inflows from water levels and outflows in reservoirs, the Yongdam and the Daecheong multi-purposed dams were applied to calculate the inflows using the existing mass balance method and new mass balance method with water level and outflow smoothed, respectively. The results are summarized as follows; 1. Most of the fluctuations of inflows from the existing mass balance method were removed by using new mass balance method with water level and outflow smoothed. 2. When inflows were calculated by adding the same errors to all water levels, inflows calculated were the same to inflows before treating errors. But if applied different errors, inflows are influenced directly by the amount of water level error multiplied water surface area. 3. When it was applied to outflow errors, inflows calculated were influenced to most of outflow errors.

2020 용담댐 홍수 유입량 분석

노재경 ( Jaekyoung Noh ) 한국농공학회 2020 한국농공학회 학술대회초록집 Vol.2020 No.-

2020년은 유난히 장마가 길었다. 무려 54일의 기록을 경신하였고, 여러 가지 문제를 일으켰다. 기후변화로 앞으로 이 개연성은 충분하다. 이 중 2020년 8월 7일∼8일 폭우로 인한 용담댐 유입량은 2001년부터 댐을 운영한 이래 최대 방류량을 야기하였고, 하류 지역에 많은 침수 피해를 가져왔다. 그 홍수 규모를 10분, 1시간, 일, 월, 년 단위로 비교, 분석하는 것은 의미가 크다. K-water 공공데이터개방포털의 자료를 분석한 결과를 큰 그림 순서의 년, 월, 일, 시간, 10분 단위로 강우량, 유입량, 방류량을 3위까지 살펴보면 다음과 같다. 분석기간은 2001년부터 2020년 까지며, 10분 단위는 2006년부터다. 첫째, 연 단위로 강우량은 1위 2020년 2,045.3mm(9월까지), 2위 2003년 2,044.8mm, 3위 2002년 1,662.0mm를 기록하였다. 유입량은 1위 2003년 15억6,843만㎥, 2위 2020년 14억9,738만㎥, 3위 2011년 11억7,046만㎥였고, 방류량은 1위 2020년의 15억9,696만㎥, 2위 2003년 15억9,028만㎥, 3위 2011년 9억4,264만㎥였다. 둘째, 월 단위로 강우량은 1위 2002년 8월의 745.9mm, 2위 2003년 7월의 681.7mm, 3위 2006년 7월의 655.4mm였고, 유입량은 1위 2003년 7월의 5억9,118만㎥, 2위 2020년 8월의 5억5,403만㎥, 3위 2006년 7월의 4억8,005만㎥였고, 방류량은 1위 2020년 8월의 7억5,522만㎥, 2위 2003년 7월 5억9,554만㎥, 3위 2020년 7월의 3억4,758만㎥였다. 셋째, 일 단위로 강우량은 1위 2020년 8월 8일의 207.5mm, 2위 2005년 8월 3일 186.0mm, 3위 2018년 8월 26일 149.5mm, 유입량은 1위 2020년 8월 8일의 2,170.3㎥/s, 2위 2005년 8월 3일의 1,979.7㎥/s, 3위 2018년 8월 26일의 1,222.5㎥/s, 방류량은 1위 2020년 8월 8일의 2,055.3㎥/s, 2위 2005년 8월 3일의 705.5㎥/s, 3위 2011년 8월 11일의 511.9㎥/s였다. 넷째, 시간 단위로 강우량은 1위 2009년 7월 15일 40.0mm, 2위 2005년 8월 2일 37.2mm, 3위 2010년 8월 13일 35.1mm, 유입량은 1위 2005년 8월 3일 5,519.2㎥/s, 2위 2020년 8월 7일 4,394.9㎥/s, 3위 2010년 8월 13일 2,575.2㎥/s, 방류량은 1위 2020년 8월 8일 2,919.5㎥/s, 2위 2005년 8월 6일 719.2㎥/s, 3위 2003년 7월 14일 603.3㎥/s였다. 다섯째, 10분 단위로 강우량은 1위 2008년 5월 18일 15.5mm, 2위 2019년 7월 25일 12.9mm, 3위 2009년 7월 15일 10.3mm, 유입량은 1위 2020년 8월 7일 4,872.7㎥/s, 2위 2010년 8월 13일 3097.7㎥/s, 3위 2009년 7월 15일 2,601.7㎥/s, 방류량은 1위 2020년 8월 8일 2,922.3㎥/s, 2위 2006년 8월 2일 542.2㎥/s, 3위 2011년 8월 10일 533.4㎥/s였다. 종합하면 2020년 8월 7일부터 8월 9일까지 용담댐의 강우량은 389.2mm, 유입량은 3억4,616만㎥, 방류량은 3억7,360만㎥을 기록하였으며, 이 기록은 2001년부터 2020년까지 연단위로 강우 1위, 유입 2위 방류 1위, 월 단위로 유입 2위, 방류 1위, 일 단위로 강우 1위, 유입 1위, 방류 1위, 시간 단위로 유입 2위, 방류 1위, 10분 단위로 유입 1위, 방류 1위에 상당하였다. 향후 이와 같은 또는 이 이상의 폭우를 예상할 수 있다. 댐 계획과 운영에 이를 충분하게 반영하여 재난에 대비해야 할 것이다.

하구둑의 일 물수지 모형 개발

노재경 ( Noh Jae Kyoung ),이항식 ( Lee Hang Sik ),진용신 ( Jin Yong Shin ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-

In order to analyze water supply capacity in estuary barrage dam, a system was developed in which base model was consisted of daily water balance model and daily inflow model. Agricultural water demand to paddy fields and domestic and industrial water demand were considered in this daily water balance model. Also outflow volume through sluice gate and inside water level at time to start outflow was conditioned initially to simulate reservoir storage. The DAWAST model was selected to simulate daily reservoir inflow in which return flows from agricultural, domestic and industrial water were included to simulate runoff. Using this developed system, water supply capacity in the Keum river estuary reservoir was analyzed.

부사호 양수실적에 의한 논 관개용수 수요량 추정

노재경 ( Jaekyoung Noh ),이재남 ( Jaenam Lee ),유용신 ( Yongsin Yoo ) 한국농공학회 2012 한국농공학회 학술대회초록집 Vol.2012 No.-

부사호는 1991년에 축조되었고, 유역면적 28,800 ha(보령댐 유역 16,360 ha), 저수량 1,085만㎥에 이르는 담수호이다. 수혜면적은 유역외의 남포지구 489 ha, 부사지구 656 ha, 배후지 480 ha, 보충급수지 275 ha 등 1,900 ha에 이른다. 소황 및 증산 양수장으로부터 양수실적에 의한 논 관개용수 공급량과 수정 Penman 공식에 의한 증발산량을 반영한 추정 관개용수 수요량과 비교한 결과는 다음과 같다. 첫째, 2009년부터 2011년까지 부사지구 수혜답의 연 관개용수 수요량은 1,000~1,724만 ㎥에 이르는 것으로 나타났으며, 월평균은 4월 26만㎥, 5월 277만㎥, 6월 444만㎥, 7월 227만㎥, 8월 435만㎥, 9월 167만㎥에 이르렀다. 둘째, 2009년부터 2011년까지 남포지구 수혜답의 연 관개용수 수요량은 519~597만 ㎥에 이르는 것으로 나타났으며, 월평균은 4월 9만㎥, 5월 96만㎥, 6월 154만㎥, 7월 79만㎥, 8월 180만㎥, 9월 58만㎥에 이르렀다. 셋째, 양수실적은 부사지구 연평균 1,373만㎥, 남포지구 717만㎥로 나타났으며, 추정 수요량 1,575만㎥, 546만㎥과 비교되었으며, 허용할 수준의 값으로 판단하였다.