• Title/Summary/Keyword: river basin

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Morphometric Characteristics and Correlation Analysis with Rainfall-runoff in the Han River Basin (한강 유역의 형태학적 특성과 강우-유출의 상관분석)

  • Lee, Ji Haeng;Lee, Woong Hee;Choi, Heung Sik
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.38 no.2
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    • pp.237-247
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    • 2018
  • The basin characteristics reflect the attributes of geomorphological pattern of basin and stream networks affect the rainfall-runoff. In order to analyze the relationship between the basin runoff and stream morphometric characteristics, the morphometric characteristics were investigated for 27 water-level observation stations on 19 rivers in the Han River basin using Arc-map. The morphometric characteristics were divided into linear, areal and relief aspects for calculation while the annual mean runoff ratio as a basin response by rainfall was estimated using the measured precipitation and discharge to analyze the rainfall-runoff characteristics. The correlation among the morphometric parameters were schematized to analyze the correlations among them. The multiple regression equation for rainfall-runoff ratio was provided with morphometric parameters of stream length ratio, form factor ratio, shape factor, stream area ratio, and relief ratio and the coefficient of determination was 0.691. The RMSE and MAPE between the measured and the estimated annual runoff rates were found as 0.09, 11.61% respectively, the suggested regression equation showed good estimation.

An Analysis on the Relationship between Discharge and Pollution Load on the Tributary Basin of Kum River (금강지류 유역에서의 유출량과 오염부하량의 상관관계 분석)

  • Jeong, Sang-Man;Im, Gyeong-Ho;Choe, Jeong-Hyeon
    • Journal of Korea Water Resources Association
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    • v.33 no.5
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    • pp.527-536
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    • 2000
  • This study estimates the pollution load in a basin by regional groups analyzing the relationship between the discharge and pollution load. The study area is placed in the Miho stream basin known as the main tributary of the Kum river. Four major Telemetary streamflow stations are chosen. In this research, discharge and water quality in a dry season and a flood season from the observed discharge in the stream are analyzed. The Rating-Curve and the Pollutograph are drawn analyzing discharge and water quality at the major stations. The characteristics of runoff for each stream are analyzed and the change of water quality are analyzed for rainfall period. The relationship between discharge and water quality has been investigated. The relationship between the discharge and pollution load is analyzed and a representative equation is derived. These relationships permit an estimates of the pollution load at the Miho stream basin. basin.

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Weathering Characteristics of Granitic Grus in Naesung Stream Drainage, Yeongju-Bonghwa Basin, Korean Peninsula (내성천 유역분지인 영주-봉화 분지 화강암 구릉대의 풍화 특색)

  • Kim, Youngrae;Kee, Keundo
    • Journal of The Geomorphological Association of Korea
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    • v.21 no.4
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    • pp.97-108
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    • 2014
  • Naesung stream famous for 'sandy river', a tributary to the Nakdong River, flows through Yeongju-Bonghwa Basin, its drainage. If the dismantlement of granitic hills in basin is in final stage, weathering materials from hills into stream are finer materials like silty or sandy loam than coarse sand, because sand as weathering mantles is provided from granitic hills, in general. So the granitic hills in Yeongju-Bonghwa basin is dissecting present. As a results of the CIA analysis(A-CN-K and A-CNK-FM ternary diagram), chemical weathering of granitic grus in Yeongju-Bonghwa basin is too very weak for calcium and sodium to be dissolved and go as far as to be more weak than that of Jeongeup, Nonsan and Namwon, common granitic grus in Korean Peninsula. Therefore, the chemical characteristics of granitic hills in Yeongju-Bonghwa basin show that the alteration of weathering mantles just finished disintegration and is dissected at a standstill. Plenty of sands provided from granitic hills is filling the channel of Naesung stream.