• Title/Summary/Keyword: Geumgang Estuary Bank

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The Monitoring of Eel-ladder in Geumgang Estuary Bank, Yeongam Embankment and Asanman Embankment (금강하굿둑, 영암방조제, 아산만방조제 뱀장어 전용어도 모니터링)

  • Jae Goo Kim;Yun Jeong Cho;Cheol Woo Park;Jong Wook Kim;Yu-Sin Shin;Min-Young Im;Younghee Song;Wonjang Kim;Yoon Choi
    • Korean Journal of Ecology and Environment
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    • v.55 no.2
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    • pp.167-174
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    • 2022
  • The Ministry of Oceans and Fisheries promoted the installation of eel-ladder for the purpose of creating inland water resources. Currently, eel-ladder have been installed and operated at the Geumgang Estuary Bank (2018), Yeongam Embankment (2019), and Asanman Embankment (2020). In this study, the number of glass eels in eel-ladder in 2021 was monitored and factors affecting the rise that from ocean to river of eels were investigated. Glass eels in eel-ladder were found when the salinity was relatively low, and they started when the freshwater and seawater temperatures were above 20℃. Comparing the number of occurrences by year, the largest number of glass eels was observed in 2021, but it is judged that this is not according to the distribution of glass eels in sea, but rather as a result of the investigator's eel-ladder repair and guidance on illegal fishing.

Experiment of Artificial Ladder for the Improve of Eel Ladder: II. About Pebble Size and Ladder Angles (뱀장어 전용어도 개선을 위한 인공어도 실험 II. 자갈 입자 및 각도에 대하여)

  • Kim, Jae Goo
    • Korean Journal of Ichthyology
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    • v.34 no.2
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    • pp.127-132
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    • 2022
  • Most of the downstream of the river is blocked by beams, so fishways are required for the movement of conciliatory fish species and connection with the upstream. Therefore, it is very important as an ecological pier that can help free movement of fish. The three previously installed eel ladders use only brushes on the bottom. For find out the effect of the bottom material except to brush, experimented used model glass eel ladders to the ascent of glass eel. The eel ladder model was 1.2 m length, 0.3 m wide, and 0.1 m high, and three gravels of different particles were attached to the bottom of the fish ladder setting on the Geumgang Estuary Bank. The first model ladder was made of gravel with particles of 5 mm, and the second model ladder was made of gravel with particles of 2 mm. The third model ladder was made by solidifying with particles of 1 mm or less cement. All experiments were repeated 5 times for 1 hour. As a result of the experiment, the lower the angle, and the smaller the gravel particles, the more glass eels are ascended to the ladder, but the made of cement was nearly not ascent. The gravel-bottom model ladder has a lower discharge and flow rate than the brush ladder so more glass eels can ascent ladder, and if the glass eel ladder is improved through experiments applying various floor materials and variables in the future, more glass eels are going to ascent glass eel ladder.

A Comparative Analysis of Annual Surface Soil Erosion Before and After the River Improvement Project in the Geumgang Basin Using the RUSLE (RUSLE을 활용한 금강 수변지역의 하천정비사업 전·후의 연간 표토침식량 변화 비교분석)

  • Kim, Jeong-Cheol;Choi, Jong-Yun;Lee, Sunmin;Jung, Hyung-Sup
    • Korean Journal of Remote Sensing
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    • v.35 no.6_4
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    • pp.1351-1361
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    • 2019
  • In this study, the annual surface soil erosion amount of before (2007 year) and after (2015 year) the river improvement projects were calculated using RUSLE (Revised Universal Soil Loss Equation) in the Geumgang basin (Daecheong-Dam to Geumgang Estuary-Bank). After the results were classified into five classes, the results were compared and analyzed with the results of the change in the land cover. In order to generate each factor of RUSLE, various spatial information data, such as land cover maps for 2007 and 2015 years, national basic spatial information, soil map, and average annual precipitation data were utilized. The results of the analysis are as follows: 1) annual surface soil erosion in the study area increased the area of class 1 in 2015 years compared to 2007, 2) the area of class 2, 3 and 5 decreased, 3) the area of class 4 increased. It is believed that the average annual amount of surface soil erosion decreased in most areas due to the reduction of annual average precipitation, the formation of ecological parks, the expansion of artificial facilities, and the reduction of illegal farmland.

Diversity of Fungi in Brackish Water in Korea (국내 기수역 환경의 균류 다양성)

  • Jeon, Yu Jeong;Goh, Jaeduk;Mun, Hye Yeon
    • The Korean Journal of Mycology
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    • v.48 no.4
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    • pp.457-473
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    • 2020
  • We investigated the distribution and diversity of fungi in brackish water and soil from the Eulsukdo Island, Geumgang Estuary Bank, Suncheon Bay, Dae-ho Tide Embankment and coastal sand dune in Sinduri and Bu-nam Tide Embankment, Korea. Fungi were isolated from water samples by hand-pumped filtration, and soil samples were collected and diluted. The isolated fungi were incubated in potato dextrose agar at 25℃. A total of 173 fungal strains were isolated from brackish water and identified according to their respective internal transcribed spacer via phylogenetic analysis. The diversity of all fungal strains was analyzed according to diversity indices. The fungal strains belonged to any of 18 taxonomic orders: Pleosporales, Eurotiales, Capnodiales, Hypocreales, Polyporales, Saccharomycetales, Agaricales, Glomerellales, Mucorales, Dothideales, Russulales, Xylariales, Sordariales, Myrmecridiales, Tubeufiales, Onygenales, Cantharellales, and Amphisphaeriales. Cladosporium spp. (20%), Penicillium spp. (19%), and Fusarium sp. (5%) comprised majority of the identified strains. Two species from the fungal isolates were newly identified in Korea: Sarocladium kiliense NNIBRFG3280 and Fusicolla merismoides NNIBRFG23708.