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徐承德,宋二鎬,金活坤 慶北大學校農業科學技術硏究所 1992 慶北大農學誌 Vol.10 No.-
全國 112個 貯水池를 對象을 流域因子間의 關係 및 流域因子와 尖頭流量과의 關係를 調査·分析한 結果 다음과 같은 結論을 얻었다. 1. 流域面積과 主河川長, 流域面積과 流域의 周長, 流域面積과 支流總延長, 主河川長과 流域의 周長, 主河川長과 河川重心長, 主河川 平均傾斜와 流域의 平均標高와의 關係를 相關分析하여 相互間의 相關關係式을 誘導하였다. 2. 각 流域因子와 尖頭流量과의 單純相關分析 結果 相關係數 r=0.004∼0.546으로 比較的 낮게 나타나 流域으로부터의 流出現像은 그 流域이 여러 因子에 影響을 받는다는 것을 確認할 수 있었다. 3. 流域面積, 主河川長, 主河川 平均傾斜, 貯水池 設置點의 標高를 獨立變數로 하여 尖頭流量과의 多衆相關分析을 實施한 結果 ??인 相關式이 誘導되었다. The purpose of this study is to develop regression equations between peak flow and physical charateristic factors of watersheds. 112 irrigation reservoirs located in South Korea which are equal or larger than 200 has. in the irrigation area, are used in the analysis of this study. The results obtained from this study are as follows. 1. The results of correlation analysis of the relationships among the characteristic factors of the watersheds have been derived high significances. 2. Relationship between the peak flow and the simple correlation analysis of physical characteristic factors of the watersheds has been derived low significance. 3. The result of the multiple regression analysis between the peak flow and four physical characteristic factors of watershed such as watershed area, main stream length, average slope of main stream and elevation of reservoir are shown as the equation ; ??.(r=0.838)
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김활곤 ( Kim Hwal Gon ),서승덕 ( Suh Seung Duk ) 한국농공학회 1996 韓國農工學會誌 : 전원과 자원 Vol.38 No.3
The purpose of this study is to provide with information for the water resources development and management in stream management planning, such as information on the sediment trensport, design of dam and water facilities, river improvement and flood plains management. The major results obtained from the field measurement and analysis of the watershed characteristics, hydraulic and sediment characteristics are as follows ; 1. The rating curve formulas obtained from the analysis of the hydraulic characteristics data collected are ; Q=110.563 (H -0.474)<sup>2</sup> for 0.7m<H<1.5m, at Seogpo-Gyo and Q=66.214(H -0.146)<sup>2</sup> for 0.4m<H<1.6m, at Songriweon-Gyo. 2. The variations of vertical distribution of sediment concentration increased and of horizontal distribution of sediment concentration are negligible as the depth increased at Seogpo-Gyo and Songriweon-Gyo. 3. The results of the simple correlation analyses between specific sediment yield rate and various factors representing stream watershed characteristics show that the circumferential length of watershed, the number of streams, the total length of tributary, the average breadth of watershed, the shape factor and the basin relief are highly correlated with sediment yield(R=0.7~0.9), while the other characteristics are weakly correlated(R=0.4~0.7). The multiple regression analyses between sediment yield rate and stream watershed characteristics resulted in two variable model ; Sr=aX<sub>1</sub><sup>2</sup>X<sub>2</sub><sup>c</sup>, in the experimental watershed.
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충적하천(沖積河川)의 하상마찰(河床摩擦) 변화(變化)에 대한 조사(調査)·분석(分析)
유권규,김형섭,김활곤,우효섭,Yu, Kwon Kyu,Kim, Hyoung Seop,Kim, Hoal Gon,Woo, Hyo Seop 대한토목학회 1993 대한토목학회논문집 Vol.13 No.4
본 연구는 충적하천(沖積河川)에서 실측된 자료를 이용하여 한 하천지점에서 유량의 변화에 따른 하상형태의 변화와 그에 따른 하천마찰의 변화를 검토하는 것이다. 본 연구는 다음과 같은 조건의 하천상태에 국한한다: (1) 하폭 100m 내외의 중규모 하천, (2) 하천선형이 직선이고 하천단면의 변화가 적어 하상마찰 이외에 특별한 에너지 손실요인이 없는 하천, (3) 프루우드 수가 0.5 이하인 저수류영역(低水流領域) 하천. 본 연구에서 얻은 주요 결론을 요약하면 다음과 같다: (1) 매닝의 조도계수(粗度係數)는 평탄하상(平坦河床)의 경우 0.02정도에서 사구(砂丘) 형성시 0.05 정도로 2배 이상 증가한다. (2) 충적하천의 조도계수는 Strickler 공식 형태의 고정상 하천에 대한 조도계수 추정방법으로는 얻을 수 없다. (3) 기존의 하천시설기준에 수록된 이동상 하천에서의 조도계수 추정방법은 실제하천에 적용하는데 있어 한계가 있으며, 우리나라 자료를 이용한 구체적인 연구가 요망된다. Changes in bed forms and subsequent changes in channel roughness by changes in water discharge are discussed with the field data collected from some alluvial rivers in Korea. This study is limited to the following condition of river flow: (1) Medium size alluvial rivers with their widths of 100 m more or less, (2) Straight and prismatic river reach with no additional causes for energy loss but bed friction, (3) Lower-flow regime with Froude number less than 0.5. Major conclusions obtained from this study can be summarized as follows: (1) For the channels considered in this study, the bed roughness expressed by Manning's n increases from 0.02 for the plane beds with no sediment motion to 0.05 for the dune beds, (2) The roughness coefficient for alluvial channels should not be estimated from Strickler-type equations developed for the fixed beds, (3) The method for determining the channel roughness suggested in the present guideline for river works, River Structure Standard, appears to be lack of generality. More research based on the field data collected in Korea is needed in order to improve the existing methods.
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서승덕 ( Suh Seung Duk ),김활곤 ( Kim Hwal Gon ),우효섭 ( Woo Hyo Seop ) 한국농공학회 1996 韓國農工學會誌 : 전원과 자원 Vol.38 No.1
In Korea, total sediment discharge of a river has been estimated simply by using certain sediment transport formulas including, among others, Einstein's formula. Those formular, however, are known not to be reliable enough for the result calculated by them to be used directly to river planning and management. Therefore, the study used the Modified Einstein Procedure to the estimation of total sediment discharge, because this method is reliable estimated by measurement. Here, measurement of sediment discharge used depth integrating method. The major results obtained from the study for estimation by depth integrating method of sediment discharge in Naeseong stream are as follow; 1. The sedeiment characteristics of Naeseong stream are; The distribution of sediment grain size shows that silt and clay are 55% and sand is 45%, and the bed load sediment grain size is constituted that sand contained with the grain size from 0.062mm to 2.0mm is 80% 2. The sediment rating formulas derived from the regression analysis between the sediment discharge and flow discharge are; Seogpo-Gyo : Qs=0.017×10<sup>-4</sup> Q<sup>2.352</sup>, where discharge is 10cms<Q<100cms. Songriweon-Gyo : Qs=0.074×10<sup>-4</sup> Q<sup>2.066</sup>, where discharge is 10cms<Q<120cms. 3. The sediment discharge fluctuates with the wider range variation than the flow discharge does. As the rate of flow discharge increased, the portion of suspend load in total load increased as well.
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