Coir Roll을 이용한 자연형 호안의 수리학적 특성

宋在偶,李尙度 弘益大學校 科學技術硏究所 2001 科學技術硏究論文集 Vol.12 No.-

Laboratory flume experiments to investigate the hydraulic characteristics by using close-natured element "coir roll" are carried out. This study examines the comparision if mean velocity and roughness coefficient in the case of spread the coir roll and plant the vegetation on the coir roll. The experiments was conducted using a 0.9m-wide, 0.45-deep flume with 8m-length and a radius if 2.5m in 180℃ An approximately 5cm thickness coir roll spread the flume bottom, 10cm in length and a 0.5cm in diameter vegetation planted at intervals of 9cm on the coir roll. The water was recirculated throughout the flume and return curcuit by a centrifugal pump. The results show that spread the coir roll and plant the vegetation on the coir roll are smaller each 43 percent and 46 percent than not spread the coir roll in the case of mean velocity. In the case of roughness coefficient, spread the coir roll and plant the vegetation on the coir roll are larger each 2.54 times and 2.37 times than not spread the coir roll.

off-line 저류지 횡월류위어의 유량계수 및 적정폭 제안

宋在偶,朴晟植,金智鎬 弘益大學校 科學技術硏究所 2005 科學技術硏究論文集 Vol.16 No.-

The side weir is a structure that is installed to maintain uniform overflow discharge and reduce or distribute the peak flow in downstream at flood. The facility has been widely used in reducing the peak flow of flood when increasing the runoff in proportion to the development of watershed. To estimate more accurately the outflow over a sharp crested side weir, it is necessary to analyze the flow characteristics over side weir and to estimate the discharge coefficient in the weir equation. The purpose of this study is to suggest the suitable length of side weir and to propose equations for the discharge coefficients of side weir in off-line detention basin by means of hydraulic model experiments with the variations of upstream Froude number in the main channel and length of side weir. Experimental results show that the discharge coefficients depend on the upstream Froude number in the main channel and the ideal ratio of side weir length to main channel width was found to be more than 6.

未計測 小河川流域의 計劃洪水量 算定에 관한 硏究

宋在偶,丁榕泰 弘益大學校 1988 弘大論叢 Vol.20 No.2

The objective of this paper was to find best method of the synthetic unit hydrograph arbitrary small watershed. The following results were analyzed from the four methods. 1) For the development of more accurate peak discharge, the size and shape of the watershed need be considered. 2) The peak discharge of SCS method rather than that of Nakayasu's method was affected by drainage area and time of concentration. this is due to watershed characteristics. 3) kajiyama's and Nakayasu's method leave something to be desired for the evaluation of the accurate design discharge.

河川 水質解析 模型의 水理學的 改善方案

宋在偶,朴永軫 弘益大學校 科學技術硏究所 1995 科學技術硏究論文集 Vol.6 No.-

River pollution problems become more serious, and it is required that development of consistent plan for water quality or river system through the efficient use of water quality modeling. The characteristics of water quality in the downstream of the Han River were analyzed by deterministic technique. QUAL2E model was updated to simulate the water qualities, and improvable methods were applied on hydraulic analysis and estimation of optimal reaction coefficients. The varied flow analysis was performed in the reach of Paldang dam to Indogyo considering the effect of Jamsil submerged weir. A Sensitivity analysis was made to determine the significant reaction coefficients and an optimization technique by BFGS was used to estimate them. The calibration and verification were performed by using observed water quality data for the Han River. The Computed BOD, DO, T-N and T-P concentrations showed good agreements with the observed. The prediction of water quality in the river was made for the various discharge conditions and wastewater treatment alternatives.

河川空間의 效率的인 活用에 關한 硏究

宋在偶 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.4 No.-

The function of riverine-space is classified, in general, in to function as riverine-space use, geographical division and others. Riverine-space development is an integrated development of riparian part of river and high water river site. They can be converted public park, play ground, parking lots, etc. The results of this study are summarized briefly as follows 1. The river regime coefficient is very different between Korean rivers and continental ones. It is hydraulic and spatial characteristics of Korean rivers so Korea has broad open space as the riverine-space. 2. The most important function of riverine-space is free flood flow and previous to plan, this have to be brought to mind without fail. 3. For the effective use of riverine-space, regional properity is considered surely and synthetic plan of all over the river side including branch river is needed at any cost. 4. Natural space must be preserved as possible. The study and examination for the image of future river means a lot to plan up of rivers.

流路特性의 形能學的 硏究

宋在偶 弘益大學校 1984 弘大論叢 Vol.16 No.2

The disasters of floods due to river bend have been occurred in the alluvial rivers which were showed erosion, scouring and sedimentation. In this paper the formation of meander and some morphological characteristics of alluvial channel have been studied. The purpose of this study was to derive the relationship among factors of channel characteristics and to establish some measures of bank stabilization. The result of this study were as follows. 1. The relationship among the meander length, belt and flowrate was analyzed and it should be considered at the planning the river course. 2. The results of detailed comparison and the analysis of degree of sinuosity, velocity and water surface slops were brought light on the fact show that the curved reach is more stable than the straight one. 3. The spur dyke was proposed for the means of bank stabilization along the river bend and the classification, location, direction, length and space of spur dyke should be analyzed on the view points of bank protected.

동적세굴에 의한 교각주위 세굴특성

宋在偶,李尙度 弘益大學校 科學技術硏究所 2000 科學技術硏究論文集 Vol.11 No.-

Laboratory flume experiments to investigate the characteristics of scour around bridge pier by live-bed scour condition are performed. This study examines the comparison of maximum scour depth on clear-water condition and live-bed condition at the circular shape of bridge pier. The experiments were conducted in a 0.9m-wide, 0.45m-deep flume with 8m-length in a straight channel. An approximately 15cm layer of sand with a median diameter of 0.2mm formed the bed. Both the water and the sediment transported were recirculated throughout the flume and return curcuit by a centrifugal pump. For the sake of live-bed condition, sediment supply apparatus utilized. The results show that clear-water condition is larger maximum scour depth than live-bed condition. The aspect of scour depth also appeared that clear-water condition is longer time of scour depth because bed material grain is big and velocity is slow.

非均質 帶水層에서의 地下水 流動에 대한 2차원 數植模型에 관한 硏究

宋在優,金智鎬,鄭祐昌 弘益大學校 科學技術硏究所 1996 科學技術硏究論文集 Vol.7 No.1

The role and importance of groundwater are increased with the deficiency of surface water and contamination of river on the development and management of water resources. But in recent, imprudent development gave the negative impact on the aspect of the quantity and quality of groundwater. For example, the excessive pumping leads to exhaution of groundwater, and waste materials bring about contamination of groundwater. On the contaminant problem, the groundwater flow is the important media of pollutant transport and its phase is different hydraulic conductivity. Therefore, 2-D numerical model using FEM is developed. To verify this numerical model, it is compared with Theis's analytical solution for unsteady groundwater flow and existed model(used FDM). In this study, numerical model(used FEM) gives good agreement between analytical solution and existed model(used FDM). In this numerical simulation, homogeneous aquifer is supposed to use coarse sand, heterogeneous aquifer is supposed to consist of coarse sand and coarse gravel, and coarse sand and silt. The result of numerical simulation generally shows good agreements with real groundwater flow through homogeneous and heterogeneous aquifer.

東津江 水系의 計量形態學的 特性

宋在偶,李元熙 弘益大學校 1987 弘大論叢 Vol.19 No.2

This paper analyzed the correlation among the stream morphological characteristics and correlation between the hydraulic geometrical characteristics and frequency of discharge for Dongjin river. The purpose of this study was to provide the informations for stream development projects. The stream morphological characteristics were analyzed by the Horton's three laws. This river basin was well developed very closely to the pattern described by Horton's laws. The concept of proportional stream ordering system was employed to describe continuously the longitudinal variation of the stream morphological characteristics. The flow duration curves obtained with the daily stream flow data of 1090% frequency occurences at the gauging stations in this river basin, were expressed an exponential functions. But relationship with frequency of discharge, morphological characteristics and hydraulic geometrical characteristics were not analyzed because of lack of data. Also the result of regression analysis of meander belt and meander length showed power curve for Dongjin river

東海岸 河口 閉塞 要因 考察 : A Study on the Causes of River Mouth Closing Along the East Coast

宋在偶 연세대학교 대학원 1975 원우론집 Vol.3 No.1

The east coast seems to have remarkably different features from the west arid south coast in the geographical, geomorphological, and oceanographical senses. In this paper the auther wishes to introduce some results of investigation the causes of river mouth closing along the east coast. There are various closing form in river mouth by many causes, but the east coast has the same closing form(the ratio of closing; roughly 0.18), as well known, by the sand spit, and has not hyd-rological but littoral drift background. The river of the east coast is proved mature age from hypsometric analysis. The wave and longshore current must be principal factor to be considered, in the analysis of the closing phenomenon owing to littoral drittoral drift. The research of the blown sand is considered valuable for the next study of this subject.