流城의 地表面 特性因子에 依한 瞬間流出의 解析

徐承德,尹慶悳 慶北大學校 1984 農業科學技術硏究所報 Vol.1 No.-

落東江水系의 6個試驗區分流域에서 流出의 記錄과 15個所의 降雨量記錄値等 水文資料에 依하여 分析한 實測流量圖를 基本으로 하고 流域의 地表面傾斜 主河川傾斜 流域幅河川長 및 流域面積等 流域의 物理的 特性에 依하여 1時間 單位圖로 한 流出分析을 實施한 바 流域現象은 大體로 樹技形과 扇形이 支配的이며 平均幅은 4.6∼15.87(km) 形狀係數는 0.08∼0.37 主河川傾斜는 1.6(m/km)∼5.2(m/km)等의 形狀으로 一般流域特性을 지니고 있었고 流域의 地表面傾斜(R)는 流域의 等高線과 直斷線等을 要素로 하여 ?? 式이 誘導되어 50,000분지 1地形圖上에서 쉽게 求할 수 있게 하였고 地表面傾斜와 河川長과의 關係에서 ?? 式이 誘導되었으며 流出追跡에 使用할 T-A-D의 基線長(C)의 計算은 主河川長과 主河川傾斜를 基準으로 하여 ?? 式이 誘導되었으며 貯溜常數(K)는 河川의 流域幅(W)과 地表面傾斜(R)을 因子로 하여 ?? 式이 誘導되어 追跡에 有用한 基礎를 세웠다. T-A-D에 追跡公式을 適用하여 等時流達時間內의 區分面積을 各各 流入量으로 하여 追蹟하고 이를 實測値와 誤差範圍를 比較한 바 6.2(%)의 小幅誤差로서 水文量 許容基準値 10(%)內에 있었고 頂點時間(Tp)와 基底長(Tb)사이에는 Tp=0.19∼0.32Tb의 關係가 있음이 밝혀졌다. The purpose of this study was derived a unitgraph which could be used for the ungaged watershed area from the relations between observed hydrographs and watershed characteristics such as overland slope, river length, watershed area and average width. The watershed shapes were approximately dendritic and fan. The average widths of subwatersheds were within the range of 4.6 to 15,87kilometer. The shape factors of main stream ranged from 0.08 to 0.37. The mean slopes of main stream were within the range of 1.6 to 5.2 meter per kilometer. These watersheds had normal physical characteristics. The relation between the overland slope (R) and the river length (L) was estimated as ?? having a high significance of correlation coefficient 0.93. The base length (C) of the time-area-diagram for the IUH was given by ?? with correlation coefficient of 0.95, indicating the relation to eh length of main stream (L) and slope (S). The storage constant (K) in connection with the average width (W) and the overland slope (R) was derived as ?? with a high significance. The average errors in the peak discharge of the IUH and the overserved unitgraph was estimated as 6.2 percent. The relation between the time(hours) required from start of rise to peak rate(Tp) and the time of base length (Tb) on average unitgraph was estimated as Tp=(0.19 to 0.32) Tb.

천붕(天崩) 외 1편

윤경덕 고요아침 2004 열린시학 Vol.9 No.4

지난해의 우리산림

윤경덕 한국산림경영인협회 1997 山林經營 Vol.127 No.-

제9차 한$\cdot$인도 임업위원회를 마치고

윤경덕 한국산림경영인협회 1989 山林經營 Vol.41 No.-

颱風性 降雨의 時空間 分布에 關한 硏究

尹慶悳,徐承德 慶北大學校農業科學技術硏究所 1997 慶北大農學誌 Vol.15 No.-

The objective of this study is to provide with the hydro-meteological and probabilistic characteristics of the storms of typhoons that have been passed through the Korean peninsula during the last twenty-three years since 1961. The paths and intensities of the typhoons were analyzed. Fifty weather stations were selected and the rainfall data during typhoon periods were collected. Rainfall data were analyzed for the patterns and probabilistic distributions. The results were presented to describe the areal distributions of probabilistic characteristics. The results obtained from this study can be summarized as follows: 1. The most frequent typhoon path that has passed through the Korean peninsula was type E. followed by types CWE, W, WE, and S. The most frequent typhoon intensity was type B. followed by A, super A, and C types, respectively. 2. The third quartile typhoon rainfall patterns appear most frequently followed by the second, first, and last quartiles, respectively, in Seoul, Pusan, Taegu, Kwangju and Taejon. The single typhoon rainfalls with long rainfall durations tended to show delayed type rainfall patterns predominantly compared to the single rainfalls with short rainfall durations. 3. The most frequent probabilistic distribution of typhoon rainfall event is Pearson type-Ⅲ, followed by Two-parameter lognormal distribution, and Type-Ⅰ extremal distribution. 4. The most frequent probability distribution model of seashore location was Pearson type-Ⅲ distribution. The most frequent probability distribution model of inland location was two parameter lognormal distribution.

한반도(韓半島)에 내습(來襲)한 태풍(颱風)의 확률강우(確率降雨) 및 풍속(風速)의 시공적(時空的) 분포(分布) 특성(特性)

윤경덕 ( Yoon Kyung Duck ),서승덕 ( Suh Seung Duk ) 한국농공학회 1994 韓國農工學會誌 : 전원과 자원 Vol.36 No.3

The objective of this study is to provide with the hydrometeological and probabilistic characteristics of the storms and winds of typhoons that have been passed through the Korea peninsula during the last twenty-three years since 1961. The paths and intensities of the typhoons were analyzed. Fifty weather stations were selected and the rainfall and wind data during typhoon periods were collected. Rainfall data were analyzed for the patterns and probabilistic distributions. The results were presented to describe the areal distributions of probabilistic characteristics. Wind data were also analysed for their probabilistic distributions. The results obtained from this study can be summarized as follows: 1. The most frequent typhoon path that have passed through the Korean peninsula was type E, which was followed by types CWE, W, WE, and S. The most frequent typhoon intensity was type B, that was followed by A, super A, and C types, respectively. 2. The third quartile typhoon rainfall patterns appear most frequently followed by the second, first, and quartiles, respectively, in Seoul, Pusan, Taegu, Kwangju and Taejon. The single typhoon rainfalls with long rainfall durations tended to show delayed type rainfall patterns predominantly compared to the single rainfalls with short rainfall durations. 3. The most frequent probabilistic distribution for typhoon rainfall event is Pearson type-III, followed by Two-parameter lognormal distribution, and Type-I extremal distribution. 4. The most frequent probability distribution model of seashore location was Pearson type-III distribution. The most frequent probability distribution model of inland location was two parameter lognormal distribution. 5. The most frequent probabilistic distribution for typhoon wind events was Type-I xtremal distribution, followed by Two-parameter lognormal distribution, and Normal distribution.

農業用水의 水質環境 調査分析

徐承德,金泰漢,尹慶悳 COLLEGE OF AGRICULTURE KYUNGPOOK NATIONAL UNIVERSI 1983 慶北大農學誌 Vol.1 No.-

Total annual water reqirements for agricultural use are exceedingly large. In many areas of the country, particularly in the arid regions, irrigation water requirements comprise the bulk of the total developed water supply. On the other hand, we are, at present, poorly prepared to evaluate the hazards of many substances in the water phase of the agricultural environments. This study is to survey the water quality phase of agricultural conditions and to give some ideas to prevent disasters from the environmental hazards such as PH, Electric Conductivity, BOD, DO, Cu, Pb, and Cd. In the analysed results, mean PH was 6.5 to 7.8, maximum EC was 200 μΩ/cm at 25℃, the maximum BOD was less than 10ppm (standard value), the DO was 4.2 to 12.0 mg/L (standard value is more than 2.0 mg/L) and the Cu, Pb, Cd were estimated in scope of safety value respectively. Especially BOD is gradually closed with the hazardous point in the few places. At present, the hazardous environmental conditions originated from the municipal sewage, industrial waste, and human and domestic animals excrements etc. have to strongly be improved much better than before.

유역의 지상적 요인과 저수지 비퇴사량과의 관계분석

서승덕,박흥익,천만복,윤경덕 한국농공학회 1988 한국농공학회논문집 Vol.30 No.4

The purpose of this study is to develop regression equations between annual specific sedi- ment of reservoirs and physiographic factors of watersheds. 122 irrigation reservoirs, which have irrigation areas equal to or larger than 200 ha, located in Korea except Cheju province are used in the analysis. Simple regression analyses between the specific annual sediment and each of the physical characteristic factors of the reservoirs are carried out at first. Then, multiple regression analyses between the annual specific sediment and the physical characteristic factors with high correlation coefficients in the simple regression analyses are made. The results obtained from this study are as follows : 1. The results of the sirnple regression analyses show that in each province the watershed area, the length of mainstream, the circumferential length of watershed have high cor- relation coefficients (R=0.814-0.986), and that drainage density, reservoir capacity per watershed area, drainage frequency, basin relief have low correlation coefficients (R=0. 387-0.955). 2. The purposed multiple regression equations between the annual specific sediment of reservoirs and three major characteritic factors of watersheds, namely, the watershed area, the circumferential length of watershed, and the length of mainstream, are proposed as given in Table 2. 3. The result of the simple regression analyses with respect to the reservoir elevation except Jeonnam province, which has very different characteristics comparing to other provinces, shows that watershed area, main stream length and circumferential length have high correlation coefficients (R=0.806-0.884) in low-elevation reservoirs and intermediate- elevation reservoirs, but low correlation coefficients (R=0.639-0.739) in high-elevation reservoirs. 4. With respect to the reservoir elevation, the proposed multiple regression equations bet- ween the annual specific sediment of reservoirs and the three major characteristic factors of watershed which have high correlation coefficients are proposed as given in Table 5.

소규모 농업용 저수지의 저류량-용수공급능력 결정에 관한 연구

안승섭,정순돌,이증석,윤경덕,장인수 한국환경과학회 2002 한국환경과학회지 Vol.11 No.12

This study aims at the effective estimation of water supply capacity of small scale reservoir and the proposal of the data which is necessary to establish the water resources management plan of down stream area of the reservoir in the future by comparison and examination about reservoir operation technique for the security of agricultural water in small scale reservoir. The result of flow calculation by Tank model is used for the input data as the inflow data which is needed for the analysis of water supply capacity. Stochastic method, simulation method, and optimization method are used to examine the water supply capacity, and water security amount is compared with each method. From the analyses of water supply capacities by each method, slightly different results are shown in spite of the effort to compare them equally using input data such as inflow data under equal conditions, and the comparison of water supply capacities by each method are follows; linear planning method, and transition probability matrix method in the order of amount from the largest. It is thought that the simulation method in which comparatively reasonable application of the inflow data is possible and is simulated in successive time series dam operation of the three methods used in this study thus, simulation model is proper to estimate the water supply capacity of agricultural small scale reservoir. And it is judged that the heightening of efficiency of water resources utilization according to the development of downstream area of dam may be possible using the upward readjusted water supply amount of 55.18×10^6ton at 95% and 90% supply reliability respectively which are above the planning water supply amount of 50.0×10^6ton when the simulation method is introduced as the standard.

유역(流域)의 지상적(地相的) 요인(要因)과 저수지(貯水池) 비퇴사량(比堆砂量)과의 관계분석(關係分析)

서승덕 ( Suh Seung Duk ),임흥익 ( Lim Heung Ik ),천만복 ( Cheon Man Bock ),윤경덕 ( Yoon Kyung Duk ) 한국농공학회 1988 韓國農工學會誌 : 전원과 자원 Vol.30 No.4

The purpose of this study is to develop regression equations between annual specific sedi- ment of reservoirs and physiographic factors of watersheds. 122 irrigation reservoirs, which have irrigation areas equal to or larger than 200 ha, located in Korea except Cheju province are used in the analysis. Simple regression analyses between the specific annual sediment and each of the physical characteristic factors of the reservoirs are carried out at first. Then, multiple regression analyses between the annual specific sediment and the physical characteristic factors with high correlation coefficients in the simple regression analyses are made. The results obtained from this study are as follows : 1. The results of the simple regression analyses show that in each province the watershed area, the length of mainstream, the circumferential length of watershed have high cor-relation coefficients (R=0.814-0.986), and that drainage density, reservoir capacity per watershed area, drainage frequency, basin relief have low correlation coefficients (R=0. 387-0.955). 2. The purposed multiple regression equations between the annual specific sediment of reservoirs and three major characteritic factors of watersheds, namely, the watershed area, the circumferential length of watershed, and the length of mainstream, are proposed as given in Table 2. 3. The result of the simple regression analyses with respect to the reservoir elevation except Jeonnam province, which has very different characteristics comparing to other provinces, shows that watershed area, main stream length and circumferential length have high correlation coefficients (R=0.806-0.884) in low-elevation reservoirs and intermediate- elevation reservoirs, but low correlation coefficients (R=0.639-0.739) in high-elevation reservoirs. 4. With respect to the reservoir elevation, the proposed multiple regression equations bet-ween the annual specific sediment of reservoirs and the three major characteristic factors of watershed which have high correlation coefficients are proposed as given in Table 5.