하천생태계와 경관복원을 위한 도시소하천의 유지유량확보에 관한 연구 : 울산 무거천을 중심으로 Applied to the Mugeo Stream in the Ulsan Metropolitan Area

이수식 ( Soo Sik Lee ) 한국환경과학회 2007 한국환경과학회지 Vol.16 No.5

HEC-6모형을 이용한 방사보 철거 전후에 따른 하상변동 특성

안승섭,이수식,최윤영,이증석,Ahn. Seung-Seop,Lee. Soo-Sik,Choi. Yun-Young,Lee. Jeung-Seok 한국방재학회 2001 한국방재학회논문집 Vol.1 No.3

본 연구에서는 HEC-6 모형을 이용하여 태화강 본류하도 하구부에 위치한 방사보의 영향에 따른 하상변동특성을 분석 검토함으로서, 향후 태화강 하도종합개발계획 수립시에 효과적으로 이용할 수 있도록 하였다. 하상변동특성 분석에 필요한 유량 조건은 태화강 하천정비기본계획수립에서 검토된 풍수량, 홍수량 및 계획홍수량 조건을 이용하였다. 먼저, 하상변동폭에 대한 분석 결과, 삼호교 하류 하도구간에서는 유하유량이 클수록 세굴과 퇴적이 활발히 진행되고 있으나 삼호교 상류 하도구간에서는 큰 변동이 없는 것으로 분석되었다. 다음으로, 유사이송능을 검토한 결과, 유하유량이 클수록 유사이송능은 큰 값으로 추정되었으나 계획홍수량 유하시 방사보 철거전후의 태화강 하구부의 유사이동능은 큰 차이가 없는 것으로 분석되었다. 따라서, 방사보 철거로 인한 토사유입량 감소대책을 고려하여 태화강 하류부에서 유입되는 동천지류의 최하류부에 하천유지용수 확보와 태화강으로의 유사량 유입을 감소시키기 위하여 적절한 수리 구조물을 설치한다면 방사보 제거 후에도 태화강 최하류부의 유사량 퇴적을 감소시키는 좋은 방안이 될 것으로 판단된다. In this study, the characteristics of river bed profile fluctuation are become possible to be used effectively in future estimation of Taehwa river general development plan through analysis and examination according to the effects of sediment protection weir located in the area of the estuary of Taehwa river`s main channel using HEC-6 model. The flow conditions needed in analysis of the characteristics of river bed profile fluctuation refer the conditions of flow which secures 95 days in a year, flood flow, and design flood examined in the estimation of Taehwa river maintenance basic plan. First, in analysis result of river bed variation range, there is no significant variation in upstream section from Samho-gyo while there are the more active erosion and sedimentation as the more flow in downstream from Samho-gyo. Next, from the result of the capacity of sediment transfer, it is analyzed that sediment transfer capacity in the area of estuary of Taehwa river has no significant difference in before and after removal of the sediment protection weir when design flood flows while it is estimated that the more flow, the bigger sediment transfer capacity. Therefore, it is thought that the installation of a suitable hydraulic structure at the lowest point of Dong-chun tributary joins from the downstream of Taehwa river can be a good device to reduce the accumulation of sediments at the lowest point of Taehwa river considering the reduction plan of sediment inflow caused by removal of the sediment protection weir.

수질관리 위한 도시하천의 유지유량 결정에 관한 연구

박노삼(Ro Sam Park),이수식(Soo Sik Lee),안승섭(Seung Seop Ahn) 大韓環境工學會 1998 대한환경공학회지 Vol.20 No.2

울산 동천의 지하수 및 복류수 이용방안 연구

김일배(Il-Bae Kim),이수식(Soo-Sik Lee) 한국환경관리학회 2005 環境管理學會誌 Vol.11 No.2

택시 운전기사들의 STRESS TYPE과 교통사고와의 관계

이수식 慶星大學校 1987 부산수산대학 논문집 Vol.8 No.1

This study is amed at the analyses of the relation between driver's personality types decided on the stress degree and car accidents aroused by the drivers. One hundred fourty five(145) taxi drivers were sampled as subjects for this study. To investigate whether car accidents aroused by the drivers are associated with the biographical characteristics and stress types, 2×3 factorial analyses of variance are performed with the degree of car accidents as the dependant variable, and with stress types, biographical characteristics(age, carrier, history of education, supporter) as the independant variable. The result of analyses of variance is summed up as follows. 1. The younger drivers are, the more accidents there are. 2. In the case of A type, the more careers they have, the more accidents there are, but in the case of B type, no career have an effect on car accidents. 3. The higher their education is, the more accidents there are. 4. Supporting family dose not have an effect on accident. 5. The variable of stress types have more effect on the car accident than other variables.

스트레스와 環境에 關하여

李秀植 경성대학교 1982 부산수산대학 논문집 Vol.3 No.1

This organization of stress research is three components; a source, a transmission, and a recipient. Several points can be emphasized. First, the three components are interactive. Second, the recipient has several potential to stress. The pituitary-adrenocortical reaction are moderately well researched by Seley(1956, 1976). Third, appraisal and coping mechanisms may span periods of time longer than just the application of the stressor;evalvation processes may begin well in advance, may be affected by the recipient's personal coping resources. Fourth, the environment is the source of a number of potential stressors, Some of these are physiological;others are psychological.

생물막공정에 의한 상수원수의 수질개선에 관한 연구

이수식,안승섭 대한상하수도학회 1999 상하수도학회지 Vol.13 No.1

This study aims at a proposal of the plan that can improve raw water quality by an experimental study using influent water of Nak-dong river, which has been used as raw water for drinking in U-city, through the establishment of the submerged biofilter process PILOT PLANT of media packing channel method. From the analysis of removal efficiency for each water quality item of the collected sample, following results are obtained. First of all, the removal rate of suspended material, BOD, COD, T-N, TOC, turbidity, and NH_3-N appear 82%, 78%, 42%, 15%, 57%, 43%, 54%, and 55% respectively and it is known that the submerged biofilter process of media packing channel method takes effects on water quality improvement from the above analysis results of water treatment efficiency. And the analyzed results for water temperature, residence time, and activities of microorganism, which can be the factors affect on water quality improvement, are as follows. 1) The removal rate variation of SS, BOD, and COD attendant on water temperature change is examined and it is known that the removal rate increases at 13℃ or above. 2) The removal rate of SS, BOD, and COD attendant on residence time is most active in the range of 0~1.8hr, 0~2.7hr respectively, so it is found that the removal rate becomes smaller after 2.7hr. 3) From the examination of microorganism activity with the abundance of normal bacteria, it is found that the floating bacteria decrease as the flow distance from raw water inflow point of PILOT PLANT increases, and the adhesive bacteria have no concern with the flow distance. And it its known that the biomass of fine algae decreases as the flow distance from the raw water inflow point of PILOT PLANT increases from the examination with Chl-a.

흡수칼럼을 이용한 암모니아가스와 이산화황가스의 처리특성 연구

이수식,김일배 울산과학대학 2001 연구논문집 Vol.27 No.2

This study was carried out to investigate the characteristics of NH₃and SO₂ gas with an absorption column, which was packed 50mm Hiflow-ring(PP) as a packing material. The purpose of this study was to improve the hazardous gas treatment efficiency of domestic 50mm Hiflow-ring(PP) as a packing material in the absorption column. In order to evaluate the effect of gas absorption process on packing material, Air, Air/water, NH₃-air/water, SO₂-air/water + 4%NaOH system were set and dry/hydraulic pressure drop, liquid holdup, height of transfer unit, number of transfer unit, gas treatment efficiency were tested according to change of gas velocity and liquid load.

HEC-2 모델에 의한 수면곡선계산법의 적용에 대한 연구

이수식 울산과학대학 1995 연구논문집 Vol.20 No.-

자연하천의 수면곡선을 계산하기 위해서는 표준축차계산법에 근거한 HEC-2모형을 이용하는 것이 일반적이다. 계산방법은 1차원 에너지방정식을 표준축차계산법으로 해석하는 절차를 따르고 있다. 이 프로그램은 홍수터 관리와 홍수로에 대한 하도잠식 뿐만 아니라 하천개수에 의한 수면곡선의 변화, 수목등의 유수소통에 대한 지장물에 의한 수면곡선의 변화 그리고 교량 등의 수리구조물의 존재에 의한 수면곡선의 영향 등을 평가할 수 있는 기능이 있다. 본 연구에서는 HEC-2 모형을 적용하여 태화강의 태화 및 삼호지구의 고수부지에 있는 대숲이 수면곡선의 변화에 미치는 영향 등에 대한 분석을 하여 그 결과를 검토하였다. The HEC-2 program is designed to calculate water surface profiles for steady, gradually varied flow in natural or man-made channels. The computation procedure is based on solution of one-dimensional energy equation using the standard step method. The program can be applied to floodplain mangement and flood insurance studies to evaluate effects on water surface profiles of channel improvements and levees as well as bridges or other structures and woods in flood-plain. The HEC-2 odel is applied to evaluate effects on water surface profiles for the presence of bamboo grove located in Taewha river floodplain of Ulsan, then the results are discussed in this paper.

安定狀態의 推計學的 動的計劃法에 의한 單一多目的 貯水池 最適運營 : 安東댐을 中心으로

李樹植,朴定奎 울산과학대학 1992 연구논문집 Vol.17 No.-

본 硏究는 安定狀態의 推計學的 動的計劃法을 單一多目的댐인 安東댐에 適用하여 月別 流入量을 豫測하고, 이에 대한 最適放流方案을 提案하고자 한다. 安定狀態의 推計學的 動的計劃法은 水文學的 變異性과 流入量의 不確實性을 고려한 모델이며, 月別 最適放流政策은 用水供給과 發電量의 不足을 最小化 시키면서 洪水와 下流의 河川維持用水 不足에 의한 損失을 最小化하는 方案으로, 最適解를 구하는 과정은 連續的인 逐次計算法이 사용된다. 본 硏究의 結果를 旣往의 運營實績과 比較해 본 結果 推計學的 動的計劃法은 單一多目的댐의 最適運營方案 樹立에 有用한 方法임을 알 수 있었다. The objective of this study is to forecast of the monthly inflows and present the usefulness of steady-state stochastic dynamic programming technique of deriving optimal release policies for the single multipurpose reservoir system of Andong reservoir. A stochastic reservoir model considers hydrologic variability and uncertainty of inflow. The procedure is based on assumption that the monthly inflows are represented by periodic Markov Chain process with anaual cycles. The monthly release policies are to minimize losses due to irrigation and industrial water, power generation deficit, damages due to flooding and meeting downstream demands. For the development of operation policy for a reservoir system, Steady-state stochastic dynamic programming approach with successive approximations is used. The results obtained from this study compared to the historical record, This model is useful for the optimal operation of single multi-reservoir system.