하천 사주의 제거로 인한 수리적 영향에 관한 연구

천만복 ( Chun Man Bog ) 한국농공학회 1997 韓國農工學會誌 : 전원과 자원 Vol.39 No.1

The sand bar has developed at the junction of the Kum-ho River and Shin-ryoung River. The sediment transported from the Kumho River basin has decreased since the Youngchon Dam has functioning. Sand bar and the vicinity of the bottleneck at the upstream of Kumho River and Osu Island which is consisted of sand bar have inundated frequently. This study was carried out through the hydraulic model test to calibrate the hydraulic effect from removal of sand bar in the river and straightening the river course by land reclamation. The water level of river at the vicinity of bottleneck can be lowered as much as 0.4~0.7m when the sand bar is removed. When river is straightened the river course by land reclamation the water level can be lowered as half of removal of sand bar.

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.

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

경북지역(慶北地域) 농촌공업화(農村工業化) 단지조성사업(團地造成事業)이 지역개발(地域開發)에 기여(寄與)하는 영향평가(影響平價)

서승덕 ( Suh Seung Duk ),천만복 ( Chun Man Bog ),윤학기 ( Yoon Hak Ki ),윤경덕 ( Yoon Kyung Duk ) 한국농공학회 1990 韓國農工學會誌 : 전원과 자원 Vol.32 No.4

Government has propelled strongly the Agricultural - cum - Industrial region development project in the nation wide. This project will not only provide employment opportunity for rural inhabitants, but also be designed to activate the rural economy. In addition, it will lead to a balanced development between the urban and rural areas. Under this project, building sites of 3 to 30 hactres will be established in the rural area in order to settle factories which are suitable to the rural condition. In this report, the researches which relating to the achievement conditions of planning, design and constructions of the building sites and the contribution conditions of Agri. - cum - Industrial Region development prejects, activated to the rural economy and regional develop ment in the Kyungpook regional areas, were surveyed and studied. On the average evaluation studies the results are as follows : 1. The achievement conditions of the planning, design and construction of the building sites. Very good-27.0 % Good-47.0% Fair-24.0 % Poor-2.0 % 2. The contribution conditions of the Agri. - cum - Industrial factories managements. Very good-17.0 % Good-41.0 % Fair-32.0 % Poor-10.0 %

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.

貯水池 流域內의 河川 特性

徐承德,宋永立,千萬福 경북대학교 산업기술연구소 1990 産業技術硏究誌 Vol.18 No.-

The purpose of this study is to develop regression equation between physical characteristic factors of watershed of irrigation reservoirs(122 reservoirs), which are in operation for 3 to 65 years and have irrigation area equal to or larger than 200 has, located in South Korea are used in the analysis. The results obtained from this study are as follows. 1. In each province, the relationships between watershed area and main stream length, circumferential length, and number of streams, and that between main stream length and total tributary length have high correlation and high stastical significance. 2. It is found that the ratios of main stream length to circumferential length, total tributary length, and centroid length are 1:3, 1:3, and 1:0.5, respectively. 3. Watershed unit characterisitics are found that the shape factor of 0.44, the stream compactness of 0.79, the stream density of 1,63㎞/㎢, the stream frequency of 1.06piece/㎢, the relief factor of 45.6 m/㎞ and the average watershed altitude of 194.2m, respectively. The result of this study are useful for understanding correlation between watershed characteristic factors of reservoirs.