유한 요소법을 이용한 중소하천 유역에서의 이동호우에 대한 유출특성 분석

조현경,이영화,최윤영 한국환경과학회 1998 한국환경과학회지 Vol.7 No.4

In the rainfall-runoff relation, consideration of the spatial movement of storms is very important in designing a hydraulic structure or evaluating an environmental influence for land usage. Because of this reason, this study has suggested the finite element model which consider the spatial movement of a stome and it was applied on a small river basin(Wi stream basin). In the application of the model the basin was treated as a pivot point and the storms are simulated with movement in each directions. As a result, it shows that the storms moving from north to south have bigger peak discharge and faster peak time than the storms moving in other directions. So these characteristics have to be considered in the designation of a hydraulic structure or evaluation of an environmental influence.

고유량 고효율 혈액투석막 재사용의 임상경험

조현경,김승정,임병국,정혁준,최영일,마경애,신규태,김흥수,김도헌 대한신장학회 2001 대한신장학회잡지 Vol.20 No.3

하천형상에 따른 유출특성의 변화에 관한 수치적 연구

조현경 영남이공대학 1998 論文集 Vol.27 No.-

This study is two goals. One is the exploration of a variation of runoff characteristics for single and looped channel networks. The other is the exploration of a variation of runoff characteristics for the influence of some channel and tloodplain hydraulic and geometric properties on the frequency distribution of peak flood flow rates as flood waves propagate downstream. For this purpose, a one-dimensional flood routing model is used to a numerical simulation. In this paper the finite difference method is applied to the solution of the Saint-Venant equations. Results show that the peak discharge and peak time in the looped channel becomes less than single channel and it influences a variation of downstream runoff characterist-ics for some channel and floodplain hydraulic and geometric properties.

낙동강유역의 중소하천에 대한 계획하폭의 결정에 관한 연구

조현경,이순탁 영남대학교 지역발전연구소 1997 새마을지역개발연구 Vol.20 No.-

This study aims at the determination of the design width for small stream in Nakdong river. For this study, it was chosen Naesung-stream which was located in the upstream of Nakdong river. In general the stream morphological characteristics of river basin has a very close correlation with the hydrological and hydraulic characteristics of the basin. So this study was derived a relationship between river width and discharge, basin area, river length. This study was suggested a river width formula for small streams in Nakdong river. As the result of analysis, it showed that these formula were very applicable.

산지유역 수문자료의 Chaos적 특성에 관한 연구

조현경 영남이공대학 산업기술연구소 2002 産業技術硏究 Vol.14 No.-

In this study, the correlation dimension and the largest Lyapunov exponent are used to diagnose whether some daily rainfall and stream flow data series are chaotic or not. And the time delay embedding method used to reconstruct an attractor from a time series. The analysis of daily rainfall and stream flow data series indicates the presence of some chaos.

개수로 분류지점에서의 흐름특성에 대한 수치적 연구

조현경 영남이공대학 산업기술연구소 2001 産業技術硏究 Vol.13 No.-

This study aims at the computation of a variation of flow characteristics of main channel for tributary outflow in open channels. Arid this study was analyzed the variation of flow depth and velocity in main channel for outflow direction. For this purpose, simulation are carried out for variations of 30°,60°,and 90°,degree and tributary outflow at junction using a numerical method. Results show that velocity ratio(v₂/v₁) decreases and flow depth ratio(h₂/h₁) increases for discharge ratio(Q₂/Q₁) of upstream and downstream when degree increases in junction.

개수로 합류점 부근에서의 흐름특성에 관한 연구

조현경,이순탁 嶺南大學校 環境問題硏究所 1996 環境硏究 Vol.16 No.1

요약문 본 연구는 개수로 합류접 부근에서의 지류유입에 따른 주하도의 흐름 특성의 변화를 산정 하는데 그 목적을 두고 있다. 또한 유입방향에 따른 주하도에서의 수심과 유속의 변화를 해석하였으며, 이를 위해서 합류부의 협각 30°, 60° 및 90°에 대해서 지류 유입량을 변환시키면서 시뮬레션을 수행하였다. 그 결과 주하도와 지류의 합류각이 커짐에 따라 상?하류의 유량비 (Q1/Q3)에 대해서 속도비 (V1/V3) 는 증가하고 수심비(H1/H3)는 감소함을 알 수 있었다. Abstract This study aims at the computation of flow characteristics of main channel for tributary inflow in the vicinity of open channel junctions. And this study was analyzed the variation of flow depth and velocity in main channel for inflow direction. For this purpose, simulation are carried out for variations of 30°, 60° and 90°angle and tributary inflow at junction. Results show that velocity ratio (V1/V3) increases and flow depth ratio (H1/H3) decreases for discharge ratio (Q1/Q3) of upstream and downstream when angle increases in junction.

유전자 알고리즘을 이용한 유출모형의 매개변수 추정

조현경,이영화 한국환경과학회 2003 한국환경과학회지 Vol.12 No.10

The genetic algorithm is investigated for parameters estimation of SED (storage - effective drainage) model from the Wi-stream watershed in Nakdong river basin. In the practical application of model. as a number of watershed parameters do not measure directly, it is desirable to make a good estimation from the known rainfall and runoff data. For the estimation of parameters of the SED model using the genetic algorithm, parameters of Green-Ampt equation(SM, K_(s)) for the estimation of an effective rainfall and initial storage(y_(in)) used in SED model are obtained a regression equation with 5, 10, 20 days antecedent precipitation. And as a consequence of computation, the parameters were obtained to satisfy the proposed objective function. From the comparison of observed and computed hydrographs, it shows a good agreement in the shape and the rising limb, peak, falling limb of hydrograph, so the SED model using the genetic algorithm shows a suitable model for runoff analysis in river basin.

豪雨의 空間分布와 面積雨量 換算係數의 算定

趙顯景,李舜鐸 嶺南大學校 工業技術硏究所 1995 工業技術硏究所論文集 Vol.23 No.1

This study was carried out to drive an ARF(Areal Reduction Factor) for converting point IDF(Rainfall Intensity-Frequency) to areal IDF. In Korea, though ARF was calculated in some river basins by several researchers, it has limit to apply to other regions due to low density of rainfall gauging station. In the study ARF has developed in Banbyeon Stream Basin by fixed-area method. The calculated ARF was appeared a general characteristics which it decreased as extension of return period, which it increased as prolongation of duration. And figures for variation ARF were presented to use it in Banbyeon Stream Basin and its applicability was analyzed.

河川流域에서의 分布型모델에 의한 降雨-流出解析

李舜鐸,趙顯景 嶺南大學校 環境問題硏究所 1995 環境硏究 Vol.15 No.1

본 論文은 降雨를 地表面 流出로 轉換하는 分布型모델인 Cell모델의 이론을 설명하고 실제 유역에 적용 분석하였다. Cell모델에서 單位流域은 地形圖에 따라 결정되며, 셀의 수는 格子모델이 많은 수의 單位流域을 사용하는 것에 비하면 비교적 적은 편이다. Cell모델은 流域에서의 降雨觀測所에서 기록된 연관성 있는 모든 降雨資料들을 가지고 流域出口에서 地表面流出 水文曲線을 구한다. 만약 어떤 流域에서 측정된 유효한 地表面 流出에 관한 資料가 있다면 이 모델은 그 셀에서 計算한 값과 비교해 볼수 있다. 전체과정은 超過降雨量의 計算, 超過降雨量으로 부터의 地表面流出量 算定, 河道流入量의 追跡, 河道損失의 計算등이다. 본 硏究는 目的函數인 殘差의 제곱합에 대해 豪雨에 대한 水文曲線을 解析하고 보정하였다. This study introduces the general outline of Cell Model, a parametric, semi-distributed, quasi-linear model, for conversion of rainfall into surface runoff. The model considers the watershed as a series of interconnected cell units, each representing a specific portion of the area of the watershed. In contrast to grid models using a large number of rectangular elements or cells, the number of cells in Cell Model is relatively small and their boundaries are chosen according to the watershed topography. For each cell, the model computes the surface runoff hydrograph at the cell outlet, related to a specified record of total rainfall data at a number of rain gauges. If measured surface runoff data are available for some locations in the watersheds, the model can compare these data with computed values of surface runoff at the corresponding points of the Cell Model. Detailed descriptions are provided for the main model procedures-computation of rainfall excess, conversion of rainfall excess into surface outflow, routing the channel inflow and subtraction of channel losses. This study is also concerned with a technique for calibrating and testing a model of storm hydrograph with emphasis on objective functions.