지상인자에 의한 순간단위도 유도와 유출량 예측

천만복,서승덕 한국농공학회 1990 한국농공학회논문집 Vol.32 No.3

The purpose of this study is to estimate the flood discharge and runoff volume at a stream by using geomorphologic parameters obtained from the topographic maps following the law of stream classification and ordering by Horton and Strahier. The present model is modified from Cheng' s model which derives the geomorphologic instantaneous unit hydrograph. The present model uses the results of Laplace transformation and convolution intergral of probability density function of the travel time at each state. The stream flow velocity parameters are determined as a function of the rainfall intensity, and the effective rainfall is calculated by the SCS method. The total direct runoff volume until the time to peak is estimated by assuming a triangular hydrograph. The model is used to estimate the time to peak, the flood discharge, and the direct runoff at Andong, Imha. Geomchon, and Sunsan basin in the Nakdong River system. The results of the model application are as follows : 1.For each basin, as the rainfall intensity doubles form 1 mm/h to 2 mm/h with the same rainfall duration of 1 hour, the hydrographs show that the runoff volume doubles while the duration of the base flow and the time to peak are the same. This aggrees with the theory of the unit hydrograph. 2.Comparisions of the model predicted and observed values show that small relative errors of 0.44-7.4% of the flood discharge, and 1 hour difference in time to peak except the Geomchon basin which shows 10.32% and 2 hours respectively. 3.When the rainfall intensity is small, the error of flood discharge estimated by using this model is relatively large. The reason of this might be because of introducing the flood velocity concept in the stream flow velocity. 4.Total direct runoff volume until the time to peak estimated by using this model has small relative error comparing with the observed data. 5.The sensitivity analysis of velocity parameters to flood discharge shows that the flood discharge is sensitive to the velocity coefficient while it is insensitive to the ratio of arrival time of moving portion to that of storage portion of a stream and to the ratio of arrival time of stream to that of overland flow.

P. E. 막을 이용한 수리모형의 수리현상

천만복,Chun Man-bog 한국관개배수위원회 1996 한국관개배수논문집 Vol.3 No.2

The purpose of this study is to make it clear that the P. E. strip textile function well as a roughness element in a rather highly distorted scale model. A series of test has been conducted in a flume to measure the effect of P. E. strip textile for the f

볼랜드식 어도 운영을 위한 유지수량 결정

천만복,박상현,Chun Man Bok,Park Sang Hyun 한국관개배수위원회 2001 한국관개배수논문집 Vol.8 No.1

The purpose of this study is to determine flow rate for operation system of the Borland fishlock. The fish ladder is usually constructed at the diversion weir crossing the river. But, at the place of the high dam, the fish ladder is very difficult to keep

볼랜드식과 계단식의 복합어도 수리모형실험

천만복,박상현,김원장,황종서 한국농공학회 1998 한국농공학회 학술대회초록집 Vol.1998 No.-

생활하수의 농업용수 재이용 자원조사

천만복,김진택,Chun Man-bok,Kim Jin-Taek 한국관개배수위원회 2002 한국관개배수논문집 Vol.9 No.2

Among 172 wastewater treatment plants, eighty eight plants are found to be qualified as wastewater resources applicable to irrigation. The total effluent capacities are $4,042 {\times} 10^3m^3$per day, which may be used to irrigate paddy fields

생활하수의 농업용수 재이용

천만복,Chun Man Bok 한국관개배수위원회 2004 한국관개배수논문집 Vol.11 No.1

This study is established to investigate reusable wastewater resources and their applications for agricultural uses, and far drought mitigation purposes that may be applied for agricultural reuse, and develop a GIS database 1) to survey the responses of f

하수처리수를 이용한 가뭄 비상용수확보

천만복 ( Chun Man-bok ),정광근 ( Chung Kwang-kun ) 한국농공학회 2004 한국농공학회 학술대회초록집 Vol.2004 No.-

본 연구는 농업용수 관개수질기준에 적합한 재이용수의 활용가능성과 가능량의 조사를 통해 가뭄 비상용수로서 생활하수를 대체수자원으로 확보하고자 수행되었다. 재이용 가능 수자원량은 전국 하수종말처리장 처리시설용량의 9% 정도인 800,000m³/day 이며, 논 면적 4,400ha에 공급이 가능할 것으로 추정된다. 추정된 전국의 재이용 가능 수자원량에 대해 RGIS를 구축하여 생활하수를 농업용수로 재이용하는 계획의 수립시 지역별 수자원량, 농지, 공급가능구역, 수리시설물 등 필요 정보의 검색이 가능하다. 하수처리수를 농업용수로의 재이용에 대한 농업용수 이용자인 농민들과 공급기관의 설문조사에서 호응도가 높고 또한, 현재 농업용수에 재이용수를 희석하여 사용되는 지구에서 수온이나 재이용수 공급에 따른 농민의 민원사항이나 피해가 전혀 없어 하수처리수의 농업용수로의 재이용에 활용성을 볼 수 있어, 향후 점진적인 확대가 가능할 것으로 판단된다. 본 연구의 결과는 부족한 농업용수의 대체수자원으로 하수처리수를 가뭄 비상용수 확보의 한 방안으로 활용 가능하다. This study is established to investigate reusable wastewater resources and their applications for agricultural uses, and for drought mitigation purposes that may be applied for agricultural reuse, and develop a GIS database 1) to survey the responses of farmers and water managers to the wastewater reuse for irrigating paddy rice crop; and 2) to explore the feasibility of the wastewater reuse for drought mitigation. The inventory of potential paddy blocks to meet the criteria summed up to 4,451 ha in South korea. The total effluent capacities of reusable wastewater are estimated to be 800 thousand tonnes per day. Preliminary surveys have been made to inquire farmers and water managers about their preference for wastewater reuse. All of them expressed their willingness to accept the wastewater reuse.

淡水湖內 水溫및 鹽度分布의 調査 分析

徐承德,千萬福 慶北大學校 1984 農業科學技術硏究所報 Vol.1 No.-

南陽湖에서 관측한 水溫 및 鹽度調査資料를 分析한 結果는 다음과 같다. 1. 水溫分布는 一般 貯水地와 같은 成層現象이 나타났다. 2. 水溫 및 鹽度의 季節的 分布狀態는 春秋季보다 冬夏季에 上·下層의 分離가 더 뚜렷하게 나타났다. 3. 鹽度分布에서는 급격한 鹽度의 變化를 나타내는 鹽度躍層 現象이 나타났으며, 季節別로 夏季에는 깊은 곳에서, 春秋季에는 얕은 水深에서 나타났다. 4. 季節別 表面水의 鹽度는 冬夏季보다는 春秋季에서 높게 나타났다. 5. 農業用水의 需要期인 5, 6月에는 水溫은 높으나, 季節的인 水溫分布와 鹽分躍層의 形成水深이 얕고, 蒸發量이 降水量보다 많은 원인으로 季節中 가장 높은 鹽度를 나타내고 있다. 6. 水溫分布의 4個因子인 水面溫度(Ts), 全水深의 水溫偏差(σvt) 相互間의 相關分析 結果는 各各 σat=0.02T²s-0.49Ts+4.7(γ=0.9), Tav=0.61Ts+3.59(γ=0.9), σat=0.105 σvt+0.121(γ=0.9)으로 나타나고 있다. 以上과 같은 現象은 地形과 氣象與件이 類似하고 小流域에 洪水到達時間이 짧으며, 排水閘門 Sill標高에 比하여 湖의 水深이 깊은 與件을 가진 同性流域의 淡水湖에서는 有用한 資料로 利用될 것으로 思料된다. 그리고 淡水湖內의 對流現象에 관련된 流入水와 流出水에 依한 鹽度躍層 形成 水深과의 關係에 關한 硏究는 以後에 더 繼續코저 한다. The purpose of this study was the basic research about hydraulic convective phenomena of freshening process. Materials used in this study were data for water temperature and salinity of an area where desalting was considerably progressed and which was a characteristic freshening reservoirs. Results obtained about seasonal change of water temperatures and salinity distribution were as follows: Water temperature distribution at Namyang reservoir was similar to that of other in land one where it was stratified. Saline interface appeared between the upper layer of high salinity and the lower layer of low salinity. Saline interface appeared at deeper place in the water during floods. In general, salinity in the water in spring and autumn was higher than that in the other seasons and the highest salinity occured in May to June(irrigation season). Correlation among water surface temperatures(Ts), water temperatures deviation of total depth(σat), average water temperature in 4∼9m depth(Tav) and water temperature deviation in 4∼9m depth(σvt) were as follows: σat=0.02T²s-0.49Ts+4.7(γ=0.9) Tav=0.61Ts+3.59 (γ=0.9) σat=0.105 σvt+0.121 (γ=0.9) These phenomena usually would occur and could be applied in the place where a small watershed had a short time of concentration and water depth of the reservoir was deep compared with the elevation the sluice sill.

생활하수의 농업대체용수 활용을 위한 GIS 구축

천만복 ( Chun Man-bok ),김진택 ( Kim Jin-taek ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-

Surveyed effluent capacities for potential wastewater resources through the surveying of the sewage treatment plants its capacity is up to 10,000 tonnes per day located 4 provinces (kyunggi, gangwon, chungbuk, chungnam) in this year. The total effluent capacities in this provinces are 423 thousand m³ / day, which may be used to irrigated paddy fields of 2,310ha A GIS database for wastewater resource inventory was developed for 4 provinces (kyunggi, gangwon, chungbuk, chungnam) to explore the feasibility of the wastewater reuse for drought mitigation. And it is to be extended to the other wastewater treatment plants.

지상인자(地上因子)에 의한 순간단위도(瞬間單位圖) 유도(誘導)와 유출량(流出量) 예측(豫測)

천만복 ( Chun Man Bog ),서승덕 ( Suh Seung Duk ) 한국농공학회 1990 韓國農工學會誌 : 전원과 자원 Vol.32 No.3

The purpose of this study is to estimate the flood discharge and runoff volume at a stream by using geomorphologic parameters obtained from the topographic maps following the law of stream classification and ordering by Horton and Strahier. The present model is modified from Cheng's model which derives the geomorphologic instantaneous unit hydrograph. The present model uses the results of Laplace transformation and convolution intergral of probability density function of the travel time at each state. The stream flow velocity parameters are determined as a function of the rainfall intensity, and the effective rainfall is calculated by the SCS method. The total direct runoff volume until the time to peak is estimated by assuming a triangular hydrograph. The model is used to estimate the time to peak, the flood discharge, and the direct runoff at Andong, Imha. Geomchon, and Sunsan basin in the Nakdong River system. The results of the model application are as follows : 1. For each basin, as the rainfall intensity doubles form 1 mm/h to 2 mm/h with the same rainfall duration of 1 hour, the hydrographs show that the runoff volume doubles while the duration of the base flow and the time to peak are the same. This aggrees with the theory of the unit hydrograph. 2. Comparisions of the model predicted and observed values show that small relative errors of 0.44-7.4% of the flood discharge, and 1 hour difference in time to peak except the Geomchon basin which shows 10.32% and 2 hours respectively. 3. When the rainfall intensity is small, the error of flood discharge estimated by using this model is relatively large. The reason of this might be because of introducing the flood velocity concept in the stream flow velocity. 4. Total direct runoff volume until the time to peak estimated by using this model has small relative error comparing with the observed data. 5. The sensitivity analysis of velocity parameters to flood discharge shows that the flood discharge is sensitive to the velocity coefficient while it is insensitive to the ratio of arrival time of moving portion to that of storage portion of a stream and to the ratio of arrival time of stream to that of overland flow.