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.

河川形態學的 特性의 比較 硏究 : 蟾津江 水系를 中心으로 Seomjin River System and Others

宋在偶,丁榕泰 弘益大學校 1985 弘大論叢 Vol.17 No.2

The purpose of this paper was to provide the basic data for long-term synthesizing development of river basin. First of all, the Horton's three laws were investigated for the whole Seomjin River system. The result proved that the Seomjin River basin was well developed according to the Horton's law. Hypsometric analysis for the Seomjin River basin showed that the basin was geomorphologically in the old phase. The result of comparing with data of Han River basin and etc. showed that morphological characteristics of Seomjin River system were more similar to them of the Geum River and Youngsan River system than the Han River system.

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.

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.

蛇行 流路의 水理幾何學的 分析

宋在偶 弘益大學校 1989 弘大論叢 Vol.21 No.2

The purpose of this study is to examine the hydraulic geometrical characteristics for the meander channel. In the analysis of some field examples, in spite of variety of meander shape, the sine-generated curve was fit with a plot of channel direction against distance. Meander characteristics of the river system using variance spectrum were analysed, and the meander paths were simulated by direction and direction-change series in this paper. Better wavelength estimates are obtained from direction-change spectra, dominant wavelength had the increasing tendency in order tributaries of the North Han river system, the South Han river system and the Han river down stream system.

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.

流路彎曲部 橋脚주위의 洗掘 및 保護工

宋在偶,李鎔桓,崔仁鎬 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-

Laboratory flume experiments to investigate the characteristics of the flows and local scour around circular shapes of bridge pier in a curved channel are performed. This study examines the effect of a circular collar devices for controlling the depth of scour. The scour depth due to a collar is about 40% of the scour depth without collar in a straight course of the flume while it is about 44% of the scour depth without collar at the location of 150˚in a curved channel. when the collar is placed yd/h=-0.2 for which the diameter of a collar is twice of the pier diameter, reduction o scour depth is very effective in a straight channel but when the collar is placed at yd/h=-0.1, the reduction of scour depth is very effective in a curved channel.

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.

비대칭 원환을 이용한 교각주위 세굴 방지 효과

宋在偶,沈遇培 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.1

Laboratory flume experiments to investigate the characteristics of the flow and local scour around circular shapes of bridge pier in a straight channel are performed. This study examines the effect of a asymmetry circular collar devices for controlling the depth of scour. As the ratio of asymmetry increased, the scour depth decreased. In addition, the maximum reduction of scouring is about 67% for CASE3 and CASE4. The prevention of scouring is most effective when the asymmetry collar for all case is placed at 0.1h below river bed.