• Title/Summary/Keyword: Han-River

Search Result 2,509, Processing Time 0.033 seconds

A Study on the Clay Minerals in the Han River Estuary and the Kyonggi Bay Areas (한강하구 및 경기만에서의 점토광물에 대한 연구)

  • 박정기;오재경
    • 한국해양학회지
    • /
    • v.26 no.4
    • /
    • pp.313-323
    • /
    • 1991

  • Fine-grained sediments of the Han River and adjacent Kyonggi Bay have been studied using the powder x-ray diffractometer in order to study the distributional characteristics of clay minerals in the bottom and suspended sediments. The result of the XRD analyse shows that the major clay minerals in the lower Han River are composed of illite (57.1%), kaolinite (22.9%), and chlorite (19.6%) and that those of the Han River Estuary are composed of illite (67.2%), chlorite (16.5%), kaolinite 915.5%), and smectite (1.3%). The variation of mineral content shows distinct distributional characteristics depending on sedimentary environments. The illite content increases gradually approaching the Kyonggi Bay and kaolinite content decreases toward the sea within the range between 11% and 23%. The trend of chlorite is similar to that of kaolinite, the amount of which ranges between 14% and 19%. Smectite content is lower than 3%. Analysis of illite using peak-intensity ratio (001/002) indicates that two types of illites occur in the study area. Dioctahedral-type illite occurs as an indicator of the marine sediments. The illites distributed between the Kyonggi Bay and the Han River are mixtures of dioctahedral- and trioctahedral-types. This study indicates that the distribution of illite, kaolimite, and chlorite has been influenced mainly by the supply from the Han River and redistributed by estuarine circulation, such as tidal circulation and seasonal variation of river discharge. However, smectite is apparently supplied from other sources such as Yellow Sea or China. This study suggests that estuarine mixing system and seasonal variations of river discharge are the major factors controlling the distribution pattern of clay minerals in the study area.

  • PDF

A Feasibility Study on the Han River Area as the Construction Site for the Kyung Bu Canal

  • Chung, Tae-Woong;Son, Bu-Soon;Kim, Ki-Hyun;Kim, Jong-Oh
    • Journal of environmental and Sanitary engineering
    • /
    • v.15 no.3
    • /
    • pp.120-127
    • /
    • 2000

  • To facilitate the carriage of goods and products, an improvement of the transportation system is greatly needed in Korea. The construction of the Kyung Bu canal that can traverse over the wide area of southern Korea os proposed to be one of the most favorable choices to resolve this need. To fulfill this plan, we investigated the possibility of connecting the Han River (in the midwest) with the Nak-tong River (in the southeast) via the Cho-ryeong tunnel (20.5 km long and 125 m high). According to topographic and geological mapping analysis, we are capable of selecting the optimal locations for the tunnels and locking systems. The water requirement for high locking systems can be satisfied by constructing additional dams above the Choong-ju area or by introducing water saving lock system. The results of our investigation support the idea such a canal system, if constructed, could lead to a revolution of the Korea's transportation system.

  • PDF

Problems of Water Use and Estimation of Water Right in North Han River Shared by North and South Korea (I) -Analysis of Diversion Impacts on Downstream Area by Imnam Dam (남북공유하천 북한강의 물이용 문제점 및 수리권 추정 (I) -임남댐 유역변경에 의한 하류 영향 분석)

  • Ahn, Jong-Seo;Jung, Kwan-Sue;Lee, Gwang-Man
    • Journal of Korea Water Resources Association
    • /
    • v.44 no.4
    • /
    • pp.305-314
    • /
    • 2011

  • Imnam Dam construction and inter-basin water transfer use by North Korea have caused several problems including water resources management aspects in the downstream reach of North Han River. Therefore, cooperative works between North and South Korea are required to make a reasonable management situation of the shared river for water quantity and quality. However, efforts by the North and the South has done not enough to achieve equitable water use in the shared river. This study analyzes main impacts caused by Imnam Dam in key sectors for reviewing water use right regarded as the most important decision-making criterion in international rivers. As the results, water deficit by Imnam Dam is calculated at 379 million $m^3$/year when river drought year for water assessment is set in 1978 in the Han River basin. Additionally hydropower production is decreased by 234 GWh/year in exclusive hydropower generation dams. In respective of water quality, BOD concentration is increased by 0.065 ppm at Sambongli in North Han River. Finally it is identified that unequitable water use based on the absolute territorial sovereignty by North Korea in North Han River has directly and indirectly affected severe impacts to South Korea as the downstream user.

  • https://doi.org/10.3741/JKWRA.2011.44.4.305 인용 PDF KSCI