Change in Marine environment after artificial reef deployment in the south sea of Korea

K. I.M. Dong-Sun, Yohei Shimasaki

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In order to study the change of marine environment after artificial reef deployment in the South Sea of Korea, water temperature, currents and nutrients distributions were investigated during the strongly stratified summer season. Before the deployment of artificial reef, the maximum thermocline of water column (MTWC) formed at depths of 30-40 m in almost all of the studied area. However, after the deployment of the artificial reef, depending on tide time, variations in MTWC were observed about 10∼17 m shallower in areas within 1 km in radius of the artificial reef due to uplifting of isotherms. In waters surrounding the artificial reef, vertical currents alternate between local downwelling flow (LDF) and local upwelling flow (LUF), and this type of phenomenon is dependent on tide time and takes on various patterns of spatial distribution. In addition, the degree of vertical mixing, which can be deduced from areas with strong current shears, especially in the surrounding area of the artificial reef from which the LUF originates, was found to be distributed in a similar manner. Although there are tide time-dependent differences in the Richardson number (Ri), in depths of 30∼40 m or deeper, where the Ri is less than 0.25, the water column was destabilized by vertical mixing. In addition, differences in nutrient distribution were noted before and after the artificial reef deployment. Highly stratified nutrients rose to the upper layer after passing the artificial reef, and the accumulation of nutrients can be attributed to the LUF developingat the artificial reef. Thus, in periods of strong stratification during the summer, the upward movement of nutrients from the aphotic to the euphoric layer increases the primary production levels, triggering the formation of a marine food chain in those areas.

Original languageEnglish
Pages (from-to)403-415
Number of pages13
JournalJournal of the Faculty of Agriculture, Kyushu University
Volume58
Issue number2
Publication statusPublished - Sep 1 2013

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artificial reefs
Republic of Korea
Oceans and Seas
marine environment
Korean Peninsula
Food
Water
nutrients
tides
Food Chain
Seawater
water
summer
Temperature
food chain
shears
primary productivity
Rosa
water temperature
spatial distribution

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Agronomy and Crop Science

Cite this

Change in Marine environment after artificial reef deployment in the south sea of Korea. / Dong-Sun, K. I.M.; Shimasaki, Yohei.

In: Journal of the Faculty of Agriculture, Kyushu University, Vol. 58, No. 2, 01.09.2013, p. 403-415.

Research output: Contribution to journalArticle

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