• Title/Summary/Keyword: Habitat environment

Search Result 1,376, Processing Time 0.028 seconds

Estimation of Suitable Flow Needs for Maintaining Fish Habitat Conditions Using Water Quantity and Quality Simulation (수량.수질 모의치를 이용한 어류 서식 조건 유지에 필요한 적정 유량 산정)

  • Kim, Gyu-Ho;Jo, Won-Cheol;Jeon, Byeong-Ho
    • Journal of Korea Water Resources Association
    • /
    • v.33 no.1
    • /
    • pp.3-14
    • /
    • 2000

  • The primary objective of this study is to estimate the suitable flow in need for conservation and restoration of the fish habitat in running water ecosystem, which has very important status in the instream flow for stream environment. Year, monthly low flows are estimated to properly maintain the fish habitat. Water depth and velocity are simulated, and also water temperature and Dissolved Oxygen(DO) are predicted at gradually varied flow using estimated low flows. These simulated conditions for each low flow are graphically compared with the requirements to maintain fish habitat at each life stage. These processes were applied to 3 riffle transects located at Dalcheon(Dal stream) in the South Han river. Pirami (Zacco platypus) was selected as a representative fish species in Dalcheon. It was shown that the suitable flow for maintaining the representative fish habitat at each life stage depends on hydraulic conditions rather than water quality conditions, and the flow ranges from the 10-year minimum low flow to consecutive 7-day 2.33-year low flow.w flow.

  • PDF

A study on historical changes of landforms and habitat structures in the mid-stream of the Mangyeong River by weirs (보 설치로 인한 만경강 중류의 하천지형과 서식처 구조 변화에 관한 연구)

  • Choi, Mikyoung;Kim, Ji-sung;Ock, Giyoung;Jung, Kwansue
    • Journal of Korea Water Resources Association
    • /
    • v.52 no.spc2
    • /
    • pp.791-799
    • /
    • 2019

  • This study explained the historical changes in the habitat structures based on the aerial photographs (1948, 1967, 1973, 1989 and 2010) of the mid-stream reach of the Mangyeong River. The habitat structure was divided into landforms and aquatic habitats. The landform was classified into bare land, vegetated land, water surface, farmland and artificial land. The aquatic habitat was classified into natural riffle, artificial riffle, run, head wando, tail wando, mid wando, pond and chute channel. The ratio of bareland decreased, and water surface and vegetated land increased after the excavation in 1970s and since the construction of weir in 1980s. As historical changes of aquatic habitat, ratio of run decreased sharply while mid wando increased sharply. aquatic habitats such as head wando, tail wando, and pond located on bars decreased dramatically.

  • https://doi.org/10.3741/JKWRA.2019.52.S-2.791 인용 PDF KSCI