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Journal of the Korea Concrete Institute

J Korea Inst. Struct. Maint. Insp.
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  • Korea Citation Index (KCI)

  1. ์ •ํšŒ์›,ํ•œ๊ตญ๊ฑด์„ค๊ธฐ์ˆ ์—ฐ๊ตฌ์› ์ง€๋ฐ˜์—ฐ๊ตฌ๋ณธ๋ถ€ ์ˆ˜์„์—ฐ๊ตฌ์›
  2. ์ •ํšŒ์›,ํ•œ๊ตญ๊ฑด์„ค๊ธฐ์ˆ ์—ฐ๊ตฌ์› ๊ตฌ์กฐ์—ฐ๊ตฌ๋ณธ๋ถ€ ์ˆ˜์„์—ฐ๊ตฌ์›
  3. ์ •ํšŒ์›,ํ•œ๊ตญ๊ฑด์„ค๊ธฐ์ˆ ์—ฐ๊ตฌ์› ๊ตฌ์กฐ์—ฐ๊ตฌ๋ณธ๋ถ€ ์ „์ž„์—ฐ๊ตฌ์›
  4. ์ •ํšŒ์›,ํ•œ๊ตญ๊ฑด์„ค๊ธฐ์ˆ ์—ฐ๊ตฌ์› ๊ตฌ์กฐ์—ฐ๊ตฌ๋ณธ๋ถ€ ์—ฐ๊ตฌ์œ„์›



๋น„๋ž˜์—ผ๋ถ„, ํ•ด์ƒ๊ต๋Ÿ‰, ๊ต๋Ÿ‰๋†’์ด, ์ง€ํ˜•ํŠน์„ฑ, ๋น„๋ž˜์—ผ๋ถ„ ๊ฐ์†Œ์œจ
Airborne chlorides, Offshore bridge, Bridge height, Topographic characteristics, Decreasing rate of airborne chlorides

1. ์„œ ๋ก 

ํ•ด์•ˆ๋ถ€๊ทผ์˜ ์ฝ˜ํฌ๋ฆฌํŠธ ๊ตฌ์กฐ๋ฌผ์€ ๋ฐ”๋‹ค์—์„œ ๋ฐœ์ƒํ•œ ๋น„๋ž˜์—ผ๋ถ„์ด๋‚˜ ์ œ์„ค์ œ ์‚ดํฌ์— ์˜ํ•œ ๋น„์‚ฐ์ž…์ž(์ดํ•˜ ์ œ์„ค์—ผ๋ถ„)๊ฐ€ ์ฝ˜ํฌ๋ฆฌํŠธ ์†์œผ๋กœ ์นจํˆฌํ•˜๋ฉด์„œ ์—ผํ•ด๊ฐ€ ๋ฐœ์ƒํ•  ์ˆ˜ ์žˆ์œผ๋ฉฐ, ์ด๋Š” ๊ตฌ์กฐ๋ฌผ ์ž์ฒด์˜ ๋‚ด๊ตฌ์„ฑ์—๋„ ํฐ ์˜ํ–ฅ์„ ๋ฏธ์นœ๋‹ค.

์ด๋•Œ, ๋Œ€๊ธฐ์ค‘ ๋น„๋ž˜์—ผ๋ถ„์ด ์ฝ˜ํฌ๋ฆฌํŠธ์— ๋ถ€์ฐฉ๋œ ํ›„, ์ฝ˜ํฌ๋ฆฌํŠธ ์†์œผ๋กœ ์นจํˆฌํ•˜๋Š” ์นจํˆฌ์—ผํ™”๋ฌผ๋Ÿ‰์€ ์ฝ˜ํฌ๋ฆฌํŠธ ํ‘œ๋ฉด์œผ๋กœ๋ถ€ํ„ฐ ๊นŠ์ด์— ๋”ฐ๋ผ ์ผ์ •ํ•˜๊ฒŒ ๊ฐ์†Œํ•˜์ง€ ์•Š๊ณ  ์–ด๋Š ๊นŠ์ด๊นŒ์ง€๋Š” ์ฆ๊ฐ€ํ•˜๋‹ค๊ฐ€ ์ตœ๋Œ€๊ฐ’์„ ๋ณด์ธ ํ›„, ์˜คํžˆ๋ ค ๊ฐ์†Œํ•˜๋Š” ์–‘์ƒ์„ ๋ณด์ธ๋‹ค(Meira et al., 2010; Lee and Ahn, 2012; Min and Lee, 2021). ์ด๋ฅผ Meira et al.(2010)๋Š” ์ฝ˜ํฌ๋ฆฌํŠธ ๋‚ด๋ถ€๋ฅผ ๋Œ€๋ฅ˜์˜์—ญ๊ณผ ํ™•์‚ฐ์˜์—ญ, 2์˜์—ญ์œผ๋กœ ๋‚˜๋ˆ„์–ด ์„ค๋ช…ํ–ˆ๋‹ค. ๋Œ€๋ฅ˜์˜์—ญ์€ ๊ฑด์Šต์ด ๋ฐ˜๋ณต๋˜๋Š” ์ฝ˜ํฌ๋ฆฌํŠธ ํ‘œ๋ฉด์„ ํฌํ•จํ•œ ์—ผํ™”๋ฌผ์˜ ๋†๋„์ฐจ์ด๋‚˜ ๋ชจ์„ธ๊ด€ ํก์ฐฉ์œผ๋กœ ์ฝ˜ํฌ๋ฆฌํŠธ ๋‚ด๋ถ€๋กœ ์—ผ์†Œ์ด์˜จ์ด ์ด๋™ํ•˜๋Š” ์˜์—ญ์œผ๋กœ, Kim et al.(2009)๋Š” ์ฝ˜ํฌ๋ฆฌํŠธ ํ‘œ๋ฉด์˜ ๊ฑด์Šต ๋ฐ˜๋ณต ์ฃผ๊ธฐ์— ๋”ฐ๋ผ ์ฝ˜ํฌ๋ฆฌํŠธ ๋‚ด๋ถ€ ๊นŠ์ด๋ณ„ ์ด ์—ผ์†Œ์ด์˜จ๋Ÿ‰์ด ๋‹ฌ๋ผ์ง„๋‹ค๋Š” ๊ฒƒ์„ ์ˆ˜์น˜ํ•ด์„์„ ํ†ตํ•ด ๋ฐํ˜€๋‚ด๊ธฐ๋„ ํ•˜์˜€๋‹ค. ํ•œํŽธ ๋Œ€๋ฅ˜์˜์—ญ์—์„œ ๊นŠ์ด๊ฐ€ ๊นŠ์–ด์งˆ์ˆ˜๋ก ์ฆ๊ฐ€ํ•˜๋Š” ์—ผํ™”๋ฌผ๋Ÿ‰์ด ์ตœ๋Œ€๊ฐ’์„ ๋ณด์ธ ํ›„ ๊ฐ์†Œํ•˜๋Š”๋ฐ, ์—ผํ™”๋ฌผ๋Ÿ‰์ด ์ตœ๋Œ€๊ฐ’์„ ๋ณด์ด๋Š” ์ง€์ ๋ถ€ํ„ฐ ๋‚ด๋ถ€๋ฅผ ํ™•์‚ฐ์˜์—ญ์ด๋ผ๊ณ  ํ•˜์˜€๋‹ค. ์ด ํ™•์‚ฐ์˜์—ญ์—์„œ๋Š” ๋†’์€ ์Šต๋„๋กœ ํ™˜๊ฒฝ์ด ์œ ์ง€๋˜๊ณ  ์žˆ๊ณ  ์—ผํ™”๋ฌผ๋Ÿ‰์€ ์ฃผ๋กœ ํ™•์‚ฐ์˜ ํ˜•ํƒœ๋กœ ๋” ๊นŠ์€ ์ฝ˜ํฌ๋ฆฌํŠธ ๋‚ด๋ถ€๋กœ ์ด๋™ํ•˜๋ฉฐ, ๊นŠ์ด์— ๋”ฐ๋ผ ์ด ์—ผํ™”๋ฌผ๋Ÿ‰์€ ๊ฐ์†Œํ•˜๋Š” ๊ฒฝํ–ฅ์„ ๋ณด์ธ๋‹ค. Meira(2010)๋Š” ๋Œ€๋ถ€๋ถ„ ๋…ธ์ถœ ์‹œํ—˜์ฒด๋“ค์ด ๊นŠ์ด 10 mm์—์„œ ๋Œ€๋ฅ˜์˜์—ญ๊ณผ ํ™•์‚ฐ์˜์—ญ์˜ ๊ฒฝ๊ณ„๋ฅผ ๋ณด์˜€๋‹ค๊ณ  ๋ฐœํ‘œํ–ˆ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ์ด ์‹œํ—˜์ฒด๋“ค์ด ๋…ธ์ถœ๋˜์—ˆ๋˜ ํ™˜๊ฒฝ์€ ๊ธฐ์˜จ์˜ ๋ณ€ํ™”๊ฐ€ ์ ๊ณ (20~30 โ„ƒ), ๊ธด ์šฐ๊ธฐ๋™์•ˆ ๋น„๊ต์  ์Šต๋„๊ฐ€ ๋†’๊ฒŒ(60~80 %) ์œ ์ง€๋˜๋Š” ์ „ํ˜•์ ์ธ ์—ด๋Œ€๊ธฐํ›„๋ฅผ ๋ณด์ธ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ Lee and Ahn(2012)์€ ์šฐ๋ฆฌ๋‚˜๋ผ์™€ ๊ฐ™์ด ๊ฐ€์„, ๊ฒจ์šธ, ๋ฐ ๋ด„์— ์ด๋ฅด๋Š” ์žฅ๊ธฐ๊ฐ„ ๋™์•ˆ ๋งค์šฐ ๋‚ฎ์€ ์Šต๋„๋ฅผ ์œ ์ง€ํ•˜๋Š” ๊ฒฝ์šฐ์˜ ๋น„๋ž˜์—ผ๋ถ„ ํ™˜๊ฒฝ์—์„œ๋Š” ๋Œ€๋ฅ˜์˜์—ญ์ด ์ƒ๋Œ€์ ์œผ๋กœ ๋” ์ปค์งˆ ์ˆ˜ ์žˆ์œผ๋ฉฐ 3๋…„ ์ด์ƒ์˜ ์žฅ๊ธฐ์ ์ธ ์ธก๋ฉด์—์„œ๋Š” ์ ์ง„์ ์œผ๋กœ ๋” ๊นŠ์–ด์งˆ ์ˆ˜ ์žˆ๋Š” ๊ฐ€๋Šฅ์„ฑ์ด ์žˆ๋‹ค๊ณ  ํŒ๋‹จํ–ˆ๋‹ค.

ํ•ด์ˆ˜์™€ ์ง์ ‘ ์ ‘ํ•˜์ง€ ์•Š๋Š” ์ฝ˜ํฌ๋ฆฌํŠธ ๊ตฌ์กฐ๋ฌผ์˜ ์—ผํ•ด๋Š” ์ฃผ๋กœ ๋Œ€๊ธฐ์ค‘์˜ ์—ผ๋ถ„, ํŠนํžˆ ์ œ์„ค์ œ์˜ ์˜ํ–ฅ์ด ์—†๋Š” ๊ณณ์—์„œ๋Š” ๋น„๋ž˜์—ผ๋ถ„์— ์˜ํ•ด ๋ฐœ์ƒํ•˜๊ฒŒ ๋œ๋‹ค. ์ด ๋น„๋ž˜์—ผ๋ถ„์€ ํŒŒ๋„์— ์˜ํ•ด ๋ฐœ์ƒํ•˜์—ฌ ๋ฐ”๋žŒ์— ์˜ํ•ด ๋‚ด๋ฅ™์œผ๋กœ ์ด๋™๋œ๋‹ค. ๋”ฐ๋ผ์„œ ๋น„๋ž˜์—ผ๋ถ„ ๋ฐœ์ƒ๊ณผ ์ด๋™, ์–‘์€ ํ’ํ–ฅ์ด๋‚˜ ํ’์†์— ์˜ํ–ฅ์„ ํฌ๊ฒŒ ๋ฐ›๋Š”๋‹ค(Sakihara et al., 2014). ๊ต๋Ÿ‰์˜ ๋น„๋ž˜์—ผ๋ถ„์˜ ์ด๋™๋Ÿ‰์ด๋‚˜ ๋ถ„ํฌ์— ๊ด€ํ•ด์„œ๋Š” ๋งŽ์€ ์กฐ์‚ฌ๋‚˜ ์—ฐ๊ตฌ๊ฐ€ ์ˆ˜ํ–‰๋˜์–ด ์˜ค๊ณ  ์žˆ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด ์ผ๋ณธ ๊ตญํ† ๊ตํ†ต์„ฑ์—์„œ๋Š” ๊ต๋Ÿ‰ ์œ ์ง€๊ด€๋ฆฌ์‹œ์Šคํ…œ(NILIM, 2009)์—์„œ ๊ต๋Ÿ‰์˜ ์—ผํ•ด๋Œ€์ฑ…์ง€๊ตฌ ๋ฐ ์—ผํ•ด์—ดํ™” ๊ด€๋ฆฌ์‹œ์Šคํ…œ์„ ์‹œํ–‰ํ•˜๊ณ  ์žˆ๋‹ค. ๋˜, ๋‹ค๋ฅธ ์—ฐ๊ตฌ( et al., 1992)์—์„œ๋Š” ๋„๋กœ๊ต์˜ ์ „๊ตญ์‹คํƒœ ์กฐ์‚ฌ๋ฐ์ดํ„ฐ๋ฅผ ์ด์šฉํ•˜์—ฌ ํ•ด์•ˆ์ง€์—ญ์˜ ๋น„๋ž˜์—ผ๋ถ„ ์ด๋™์ถ”์ •์‹์„ ๊ณ ์•ˆํ•ด๋‚ด์—ˆ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ์•ž์˜ ์„ ํ–‰์—ฐ๊ตฌ๋“ค์€ ์žฅ๊ธฐ๊ฐ„์˜ ์‹ค์ธก ๋ฐ์ดํ„ฐ๋ฅผ ๊ณ ๋ คํ•˜์ง€๋Š” ์•Š์•˜๋‹ค. ์ด์— Sakihara et al.(2014)๋Š” ์‹ค์ธก๋ฐ์ดํ„ฐ(ํ’ํ–ฅ๊ณผ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰)๋ฅผ ์ด์šฉํ•˜์—ฌ ํ•ด์•ˆ์ธ๊ทผ์˜ ๋‚ด๋ฅ™์— ์œ„์น˜ํ•œ ๊ต๋Ÿ‰์„ ๋Œ€์ƒ์œผ๋กœ ํ’ํ–ฅ๊ณผ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰๊ณผ์˜ ๊ด€๊ณ„๋ฅผ ๊ฒ€ํ† ํ•˜์˜€๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ์ด ์—ฐ๊ตฌ์—์„œ๋Š” ํ•ด์ƒ๊ต๋Ÿ‰์ด ์•„๋‹Œ ํ•ด์•ˆ์œผ๋กœ๋ถ€ํ„ฐ ๋–จ์–ด์ง„ ๋‚ด๋ฅ™์— ์œ„์น˜ํ•œ ๊ต๋Ÿ‰์„ ๋Œ€์ƒ์œผ๋กœ ํ•˜๊ณ  ์žˆ๊ณ , ๋˜ํ•œ ๋ฐ์ดํ„ฐ๋„ ๊ต๋Ÿ‰์—์„œ ์ธก์ •ํ•œ ๊ฒƒ์ด ์•„๋‹ˆ๋ผ, ํ•ด์•ˆ์œผ๋กœ๋ถ€ํ„ฐ์˜ ๊ฑฐ๋ฆฌ์™€ ํ‘œ๊ณ ๋ฅผ ๋‹ฌ๋ฆฌํ•˜์—ฌ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ์กฐ์‚ฌํ•œ ๋ฐ์ดํ„ฐ๋ฅผ ์‚ฌ์šฉํ•˜์˜€๋‹ค.

๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” 9๊ฐœ์˜ ํ•ด์ƒ๊ต๋Ÿ‰์—์„œ ๋†’์ด๋ณ„๋กœ ์ง์ ‘ ์—ผ๋ถ„ํฌ์ง‘๊ธฐ๋ฅผ ์„ค์น˜ํ•˜์—ฌ ์กฐ์‚ฌํ•œ ๋ฐ์ดํ„ฐ๋ฅผ ์‚ฌ์šฉํ•˜์—ฌ ํ•ด์ƒ๊ต๋Ÿ‰์ด ์œ„์น˜ํ•œ ํ•ด์—ญ๋ณ„๋กœ ์›”๋ณ„, ๋†’์ด๋ณ„ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์˜ ๋ถ„ํฌ๋ฅผ ํŒŒ์•…ํ•˜๊ณ , ์ง€ํ˜•์  ํŠน์„ฑ์— ๋”ฐ๋ผ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์˜ ํŠน์ง•์„ ๋ถ„์„ํ•˜์˜€๋‹ค.

2. ํ•ด์ƒ๊ต๋Ÿ‰์˜ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ์กฐ์‚ฌ๋ฐฉ๋ฒ•

ํ•ด์ƒ๊ต๋Ÿ‰์˜ ์—ดํ™”ํ™˜๊ฒฝ์„ ํŒŒ์•…ํ•˜๊ธฐ ์œ„ํ•˜์—ฌ ์›”๋ณ„, ๋†’์ด๋ณ„ ๋Œ€๊ธฐ์ค‘ ์—ผ๋ถ„๋Ÿ‰์„ ์กฐ์‚ฌํ•˜์˜€์œผ๋ฉฐ, ๋Œ€์ƒ์€ ํ•ด์ƒ๊ต๋Ÿ‰์ด ๋งŽ์€ ์„œํ•ด์•ˆ๊ณผ ๋‚จํ•ด์•ˆ์˜ ํŠน์ˆ˜๊ต๋“ค ์ค‘์—์„œ ์„ ์ •ํ•˜์˜€๋‹ค. ๋‚จํ•ด์•ˆ์—์„œ๋Š” ๊ฑฐ๊ธˆ๋Œ€๊ต, ์†Œ๋ก๋Œ€๊ต, ๋Œ์‚ฐ๋Œ€๊ต, ๊ฑฐ๋ถ์„ ๋Œ€๊ต, ๋…ธ๋Ÿ‰๋Œ€๊ต๋ฅผ ์„ ์ •ํ•˜์˜€์œผ๋ฉฐ, ์„œํ•ด์•ˆ์—์„œ๋Š” ๊ณ ๊ตฐ์‚ฐ๋Œ€๊ต, ๋ชฉํฌ๋Œ€๊ต, ์˜์ข…๋Œ€๊ต, ์„œํ•ด๋Œ€๊ต๋ฅผ ์„ ์ •ํ•˜์˜€๋‹ค. ์ธก์ •๊ธฐ๊ฐ„์€ 2017๋…„ 3์›” ~ 2018๋…„ 4์›”, ์ด 1๋…„์œผ๋กœ ๋งค์›” 1ํšŒ ํฌ์ง‘๊ฑฐ์ฆˆ๋ฅผ ํšŒ์ˆ˜ํ•˜๊ณ  ๊ต์ฒดํ•จ์œผ๋กœ์จ 1๊ฐœ์›”์˜ ๋ˆ„์ ๋Ÿ‰์„ ์ธก์ •ํ•˜์˜€์œผ๋ฉฐ ๊ต๋Ÿ‰์— ๋”ฐ๋ผ ์ธก์ •๊ฐœ์‹œ ๊ธฐ๊ฐ„์— ์•ฝ 1๊ฐœ์›”์˜ ์‹œ์ฐจ๊ฐ€ ์žˆ๋‹ค. ๊ฐ ๊ต๋Ÿ‰์˜ ๋†’์ด๋ณ„๋กœ 2 ~ 9๊ฐœ ์ง€์ ์— ์—ผ๋ถ„ํฌ์ง‘์žฅ์น˜๋ฅผ ์„ค์น˜ํ•˜์˜€๋‹ค. ์ธก์ • ๋†’์ด๋Š” ๊ฐ ๊ต๋Ÿ‰์„ ๋Œ€์ƒ์œผ๋กœ ํ•ด์ˆ˜๋ฉด์„ ๊ธฐ์ค€์œผ๋กœ 2 ~ 5 m ๋†’์ด์— ์žˆ๋Š” ์ฃผํƒ‘ํ•˜๋‹จ๊ณผ 13 ~ 62 m ๋†’์ด์— ์žˆ๋Š” ์ฐจ๋„๋ฅผ ๊ธฐ๋ณธ์œผ๋กœ ์ฑ„ํƒํ•˜์˜€์œผ๋ฉฐ, ์ฃผํƒ‘ํ•˜๋‹จ์— ์ ‘๊ทผ์ด ์–ด๋ ค์šด ๊ต๋Ÿ‰์˜ ๊ฒฝ์šฐ, ํ•ด๋‹น ๋†’์ด์˜ ์œก์ง€๋ฉด์—์„œ ์ธก์ •ํ•˜์˜€๋‹ค. ๋˜ํ•œ ์ฃผํƒ‘ ์ƒ๋ถ€๊นŒ์ง€ ์ ‘๊ทผ์ด ๊ฐ€๋Šฅํ•œ ๊ฒฝ์šฐ๋Š” ์ตœ์ƒ๋‹จ๋ถ€์—๋„ ํฌ์ง‘์žฅ์น˜๋ฅผ ์„ค์น˜ํ•˜์—ฌ ์ธก์ •ํ•˜์˜€๋‹ค(๋…ธ๋Ÿ‰๋Œ€๊ต, ์˜์ข…๋Œ€๊ต, ์„œํ•ด๋Œ€๊ต). ๊ฐ ๊ต๋Ÿ‰์— ์„ค์น˜ํ•œ ํฌ์ง‘๊ธฐ์˜ ์„ค์น˜ ์ •๋ณด๋Š” Table 1๊ณผ ๊ฐ™๋‹ค.

Table 1 The height of salinity measurement devices for each bridge

Coastal zone

Bridge name

No. of installation

Location

Height above sea level

(m)

Southern Coast

Geobukseon

brg.

7

Top of Pylon

25

Pylon

18

11

4

Land

1.5

Pier

12

Land

3

Dolsan

brg.

2

Roadway

13

Pier

2

Noryang

brg.

5

Pylon

150

100

Roadway

50

Pier

5

Ground level

3

Geogeum

brg.

3

Roadway

50

43

Land

3

Sorok

brg.

2

Roadway

50

Land

3

Western Coast

Youngjong

brg.

9

Top of Pylon

107

Upper roadway

50

Lower roadway

42

Lower roadway

(beneath)

42

Pylon

20

13

8

8

4

Seohae

brg.

6

Pylon

124

Roadway

62

Land

18

Pylon

13

10

5

Mokpo

brg.

2

Roadway

53

Pier

5

Gogunsan

brg.

3

Pylon

44

Roadway

29

Land

12

๋น„๋ž˜์—ผ๋ถ„์„ ์ธก์ •ํ•˜๊ธฐ ์œ„ํ•œ ์—ผ๋ถ„ํฌ์ง‘์žฅ์น˜์™€ ๋ถ„์„๋ฐฉ๋ฒ•์€ ์„ ํ–‰์—ฐ๊ตฌ(Lee et al., 2010)๋ฅผ ๋”ฐ๋ž๋‹ค. ํฌ์ง‘๊ธฐ์˜ ๊ฐœ๋žต์ ์ธ ํ˜•์ƒ์€ ํฌ์ง‘๋ฉด์ ์ด 100 mm ร— 100 mm ร— 100 mm ์ด๋ฉฐ, ๋ฐ•์Šค ๋‚ด๋ถ€์—๋Š” 100 mm ร— 120 mm ํฌ์ง‘ํŒ์„ 2๊ฐœ ์„ค์น˜ํ•˜์˜€์œผ๋ฉฐ, ํฌ์ง‘๋œ ๋น„๋ž˜์—ผ๋ถ„์ด ๋น„๋ฐ”๋žŒ์— ์˜ํ•˜์—ฌ ์œ ์‹ค๋˜์ง€ ์•Š๋„๋ก 20 mm ๋†’์ด์˜ ์ฐจ๋‹จ๋ง‰์ด ์„ค์น˜๋˜์–ด ์žˆ๋‹ค. ๋น„๋ž˜์—ผ๋ถ„ ํฌ์ง‘๊ธฐ ๊ฑฐ์น˜๋Œ€๋Š” ๋น„๋ž˜์—ผ๋ถ„ ํฌ์ง‘๊ธฐ๊ฐ€ ์†Œ์ •์˜ ๋†’์ด(2 m)์—์„œ ๋น—๋ฌผ ๋“ฑ ์™ธ๊ธฐํ™˜๊ฒฝ์˜ ์˜ํ–ฅ์„ ์ตœ์†Œ๋กœ ํ•˜๋ฉด์„œ ์ •๋Ÿ‰์ ์ธ ํฌ์ง‘์ด ์ด๋ฃจ์–ด์งˆ ์ˆ˜ ์žˆ๋„๋ก ๊ตฌ์„ฑํ•˜์˜€๋‹ค(Lee et al., 2010). ๋ณธ ์—ฐ๊ตฌ๋ฅผ ์œ„ํ•ด ์˜์ข…๋Œ€๊ต์˜ ๋†’์ด๋ณ„ ์—ผ๋ถ„ํฌ์ง‘๊ธฐ ์„ค์น˜ ์œ„์น˜์™€ ์‹ค์ œ ๊ต๊ฐํ•˜๋‹จ๊ณผ ์ฐจ๋„๋ฉด์— ์„ค์น˜ํ•œ ์‚ฌ์ง„์€ Fig. 1๊ณผ ๊ฐ™๋‹ค.

Fig. 1 The locations and photos of salinity measurement devices in the Youngjong Bridge
../../Resources/ksm/jksmi.2022.26.2.59/fig1.png

3. ํ•ด์ƒ๊ต๋Ÿ‰์˜ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ๋ถ„์„

3.1 ํ•ด์ƒ๊ต๋Ÿ‰์˜ ์›”๋ณ„ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ๋ถ„์„

Fig. 2์™€ Fig. 3์— ๊ฐ ๊ฐ ๋‚จํ•ด์•ˆ๊ณผ ์„œํ•ด์•ˆ ํ•ด์ƒ๊ต๋Ÿ‰๋“ค์˜ ์›”๋ณ„ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ๋„์‹œํ•˜์˜€๋‹ค. ์—ฌ๊ธฐ์—์„œ๋Š” ๊ต๋Ÿ‰๋งˆ๋‹ค ์ฐจ์ด๊ฐ€ ์žˆ๋Š” ๊ฒจ์šธ์ฒ  ์ œ์„ค์—ผ๋ถ„์— ์˜ํ•œ ๋Œ€๊ธฐ์ค‘ ์—ผ๋ถ„๋Ÿ‰ ์ฆ๊ฐ€๋ถ„์„ ๋ฐฐ์ œํ•˜๊ณ  ์ˆœ์ˆ˜ํ•œ ์›”๋ณ„ ๋Œ€๊ธฐ์ค‘ ์—ผ๋ถ„๋Ÿ‰, ์ฆ‰ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ๋น„๊ตํ•˜๊ธฐ ์œ„ํ•˜์—ฌ ์ฐจ๋„์˜ ๋ฐ์ดํ„ฐ๋ฅผ ์ œ์™ธํ•˜๊ณ , ํ•ด์ˆ˜๋ฉด์—์„œ ๋†’์ด 2~5 m์˜ ๊ต๊ฐ ํ˜น์€ ์ฃผํƒ‘ ํ•˜๋‹จ๋ถ€์—์„œ ์ธก์ •๋œ ๊ฐ’๋งŒ์„ ๋น„๊ตํ•˜์˜€๋‹ค.

Fig. 2์— ๋„์‹œํ•œ ๋‚จํ•ด์•ˆ์— ์œ„์น˜ํ•œ ๊ต๋Ÿ‰๋“ค์˜ ์›”๋ณ„ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์€ 0.3 mg/100$cm^{2}$/day(์ดํ•˜ mdd) ~ 17.4 mdd๋กœ ๋ถ„ํฌํ•˜๊ณ  ์žˆ์œผ๋ฉฐ 6์›”๊ณผ 7์›”์— ๋‹ค๋ฅธ ์›”๊ณผ ๋น„๊ตํ•˜์—ฌ ๋‚ฎ์€ ๊ฒฝํ–ฅ์„ ๋ณด์ด๋‹ค๊ฐ€ 8์›” ์ดํ›„ ์ƒ์Šนํ•˜๊ณ  10์›”~2์›”์˜ ๊ฒจ์šธ์ฒ ์— ๋†’์€ ๊ฐ’์„ ๋ณด์ธ๋‹ค. ์ด์ „ ์—ฐ๊ตฌ(Lee et al., 2010)์— ๋”ฐ๋ฅด๋ฉด ๋‚จํ•ด์•ˆ์˜ ํ•ด์•ˆ๊ฐ€(ํ•ด์•ˆ์— ๊ฐ€๊นŒ์šด ๋‚ด๋ฅ™)์—์„œ๋Š” ์—ฌ๋ฆ„์ฒ ์˜ ๋‚จ๋™ํ’๊ณผ ํƒœํ’์˜ ์˜ํ–ฅ์œผ๋กœ ๊ฒจ์šธ์ฒ ๋ณด๋‹ค ๋†’์€ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ๋ณด์ธ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ํ•ด์•ˆ๊ฐ€๊ฐ€ ์•„๋‹Œ ์„ฌ๊ณผ ์„ฌ์„ ์—ฐ๊ฒฐํ•˜๋ฉฐ ํ•ด์ƒ์— ์œ„์น˜ํ•œ ํ•ด์ƒ๊ต๋Ÿ‰์˜ ๊ฒฝ์šฐ, ๊ด€์ธก ์œ„์น˜์˜ ๋‚จ๋™์ชฝ์— ๋ฐ”๋‹ค๊ฐ€ ์•„๋‹Œ ์„ฌ์ด ์œ„์น˜ํ•˜๊ณ  ์žˆ์–ด ๊ฐ•๋„๊ฐ€ ํฌ์ง€ ์•Š์€ ๋‚จ๋™ํ’์ด ํ•ด์ƒ๊ต๋Ÿ‰์˜ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ์ฆ๊ฐ€์— ํฌ๊ฒŒ ์˜ํ–ฅ์„ ๋ฏธ์น˜์ง€ ๋ชปํ•œ ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋œ๋‹ค. ๋˜ํ•œ ์—ฌ๋ฆ„์ฒ  ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ์ฆ๊ฐ€์— ๊ธฐ์—ฌํ•˜๋Š” ์ฃผ์š”ํ•œ ์š”์ธ์œผ๋กœ ํƒœํ’์ด ์žˆ์œผ๋‚˜, ์กฐ์‚ฌ๊ธฐ๊ฐ„์˜ ์—ฌ๋ฆ„์ฒ ์— ์šฐ๋ฆฌ๋‚˜๋ผ์— ์˜ํ–ฅ์„ ๋ฏธ์นœ ํƒœํ’ 3๊ฐœ๋Š” ๋ชจ๋‘ ์ผ๋ณธ ํ์Šˆ ๋ฐ‘์ชฝ์œผ๋กœ ์ง€๋‚˜๊ฐ€๋Š” ๊ฒฝ๋กœ๋ฅผ ๋ณด์—ฌ(KMA, 2019) ์šฐ๋ฆฌ๋‚˜๋ผ์— ํฌ๊ฒŒ ์˜ํ–ฅ์„ ๋ฏธ์น˜์ง€๋Š” ๋ชปํ•œ ๊ฒƒ์œผ๋กœ ๋‚˜ํƒ€๋‚ฌ๋‹ค. ๋”ฐ๋ผ์„œ ์ธก์ •๊ธฐ๊ฐ„ ๋™์•ˆ ํƒœํ’์ด ๋‚จํ•ด์•ˆ์˜ ์—ฌ๋ฆ„์ฒ  ๋น„๋ž˜์—ผ๋ถ„ ์ƒ์Šน์— ์˜ํ–ฅ์„ ๋ฏธ์น˜์ง€ ๋ชปํ•œ ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋œ๋‹ค. ์›”๋ณ„ ํ‰๊ท ๊ฐ’ ์ค‘ ๊ฐ€์žฅ ๋‚ฎ์€ ์›”์ธ 7์›”๊ณผ ๊ฐ€์žฅ ๋†’์€ ๋‹ฌ์ธ 2์›”๊ณผ 3์›”์˜ ์—ผ๋ถ„๋Ÿ‰์€ ๊ฐ ๊ฐ 1.0 mdd, 5.8 mdd๋กœ 5๋ฐฐ ์ด์ƒ ์ฐจ์ด๊ฐ€ ๋‚ฌ๋‹ค. ์ด๋Ÿฌํ•œ ์ „์ฒด์ ์ธ ๊ฒฝํ–ฅ๊ณผ๋Š” ๋ณ„๋„๋กœ ๋‚จํ•ด์•ˆ์— ์œ„์น˜ํ•˜๋Š” ๊ต๋Ÿ‰๋“ค์˜ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ๋ถ„ํฌํŠน์ง•์€ ํฌ๊ฒŒ ๋‘ ๋ถ€๋ฅ˜๋กœ ๋ถ„๋ฅ˜ํ•  ์ˆ˜ ์žˆ๋‹ค. ์ฒซ ๋ฒˆ์งธ๋Š” ์›”๋ณ„ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ๋Œ€์ฒด์ ์œผ๋กœ ๋‚ฎ๊ณ , ์›”๋ณ„ ์ฐจ์ด๋„ ํฌ์ง€ ์•Š์€ ๊ต๋Ÿ‰์œผ๋กœ ์ด๋“ค์€ 0.3 ~ 3.1 mdd์˜ ๋ถ„ํฌ๋ฅผ ๋ณด์ด๋ฉฐ ๊ฑฐ๋ถ์„ ๋Œ€๊ต, ๋…ธ๋Ÿ‰๋Œ€๊ต, ๋Œ์‚ฐ๋Œ€๊ต๊ฐ€ ์ด์— ์†ํ•œ๋‹ค(์ดํ•˜ A๊ตฐ). ๋‘ ๋ฒˆ์งธ๋Š” ์›”๋ณ„ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ๋Œ€์ฒด์ ์œผ๋กœ ๋†’์œผ๋ฉฐ, ๊ทธ ์ฐจ์ด๋„ ํฌ๊ฒŒ ๋‚˜๋Š” ๊ต๋Ÿ‰์œผ๋กœ 0.9 ~ 17.4 mdd์˜ ๋ถ„ํฌ๋ฅผ ๋ณด์ด๋ฉฐ ๊ฑฐ๊ธˆ๋Œ€๊ต์™€ ์†Œ๋ก๋Œ€๊ต๊ฐ€ ์ด์— ์†ํ•œ๋‹ค(์ดํ•˜ B๊ตฐ). ๊ตญ๋‚ด ํ•ด์—ญ๋ณ„ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ์กฐ์‚ฌํ•œ ์ด์ „ ์—ฐ๊ตฌ(Lee et al., 2010)์—์„œ ๋‚จํ•ด์•ˆ์˜ ๋น„๋ž˜์—ผ๋ถ„ ๋ถ„ํฌ ํŠน์ง•์€ ์ „๋ฐ˜์ ์œผ๋กœ 0.7 ~ 3.5 mdd์˜ ์ ์€ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ๋‚˜ํƒ€๋‚ด๋ฉฐ, ์ด๋Š” ๋‚จํ•ด์•ˆ์ด ์ „๋ฐ˜์ ์œผ๋กœ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ์ ๊ฒŒ ๋ฐœ์ƒํ•˜๋Š” ํ™˜๊ฒฝ์ด๊ธฐ ๋•Œ๋ฌธ์œผ๋กœ ๋ถ„์„ํ•˜๊ณ  ์žˆ๋‹ค. ๋ณธ ์—ฐ๊ตฌ์—์„œ๋„ A๊ตฐ์— ์†ํ•˜๋Š” ํ•ด์ƒ๊ต๋Ÿ‰๋“ค์˜ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ๋ถ„ํฌ ํŠน์ง•์€ ์ „ํ˜•์ ์œผ๋กœ ๋‚จํ•ด์•ˆ์—์„œ ๋ณด์ด๋Š” ํŠน์ง•์„ ๋‚˜ํƒ€๋‚ด๊ณ  ์žˆ๋‹ค๊ณ  ๋ณผ ์ˆ˜ ์žˆ์œผ๋ฉฐ, ์ด์— ๋ง๋ถ™์—ฌ ์›”๋ณ„ ์ฐจ์ด๋„ ํฌ์ง€ ์•Š์€ ํŠน์ง•๋„ ๋ณด์ด๊ณ  ์žˆ๋‹ค. ์ด์— ๋ฐ˜ํ•ด, B๊ตฐ์— ์†ํ•˜๋Š” ํ•ด์ƒ๊ต๋Ÿ‰์˜ ๋น„๋ž˜์—ผ๋ถ„ ๋ถ„ํฌ๋Š” ์ „์ฒด์ ์œผ๋กœ ์–‘๋„ ๋งŽ๊ณ , ์›”๋ณ„ ์ฐจ์ด๋„ ํฌ๋‹ค. ์ด๋Š” ์ด์ „ ์—ฐ๊ตฌ(์ด์ข…์„, 2010)์—์„œ๋„ ๋™์ผ ํ•ด์•ˆ์ผ์ง€๋ผ๋„ ํ•ด์•ˆ์„ ์˜ ๋ฐฉํ–ฅ ๋ฐ ํ˜•์ƒ ๋“ฑ ๊ตญ๋ถ€์ ์ธ ๋น„๋ž˜์—ผ๋ถ„ ํ™˜๊ฒฝ์ด ํฌ๊ฒŒ ๋‹ค๋ฅผ ๊ฒฝ์šฐ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์˜ ์ถ”์ •์€ ์ถ”๊ฐ€์ ์ธ ๊ณ ๋ ค๊ฐ€ ํ•„์š”ํ•˜๋‹ค๊ณ  ๋ช…์‹œํ•œ ๊ฒƒ์ฒ˜๋Ÿผ ๊ต๋Ÿ‰์ด ์œ„์น˜ํ•œ ๊ตญ๋ถ€์ ์ธ ์ง€๋ฆฌํ™˜๊ฒฝ๊ณผ ์—ฐ๊ด€์ด ์žˆ์„ ๊ฒƒ์œผ๋กœ ๋ณด๊ณ  ๋‹ค์Œ ์ ˆ์—์„œ ์‚ดํŽด๋ณด๋„๋ก ํ•˜๊ฒ ๋‹ค.

Fig. 3์—๋Š” ์„œํ•ด์•ˆ์— ์œ„์น˜ํ•œ ๊ต๋Ÿ‰๋“ค์˜ ์›”๋ณ„ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ํ‘œ์‹œํ•˜์˜€๋‹ค. ์—ผ๋ถ„๋Ÿ‰์€ 0.4 ~ 19.0 mdd์˜ ๊ฐ’์œผ๋กœ ๋ถ„ํฌํ•˜๊ณ  ์žˆ์œผ๋ฉฐ, ๋‚จํ•ด์•ˆ๊ณผ ๊ฐ™์ด 6์›”๊ณผ 7์›”์ด ๋‹ค๋ฅธ ๋‹ฌ๊ณผ ๋น„๊ตํ•˜์—ฌ ๋‚ฎ์€ ๊ฐ’์„ ๋ณด์ด๋‹ค๊ฐ€ 8์›” ์ดํ›„ ์ƒ์Šนํ•˜๊ธฐ ์‹œ์ž‘ํ•˜๋ฉฐ 10์›”~2์›”์˜ ๊ฒจ์šธ์ฒ ์— ๋†’์€ ๊ฐ’์„ ๋ณด์˜€๋‹ค. ์›”๋ณ„ ํ‰๊ท ๊ฐ’ ์ค‘ ๊ฐ€์žฅ ๋‚ฎ์€ ๋‹ฌ์ธ 6์›”๊ณผ ๊ฐ€์žฅ ๋†’์€ ๋‹ฌ์ธ 2์›”์˜ ์—ผ๋ถ„๋Ÿ‰์€ ๊ฐ ๊ฐ 1.0 mdd, 7.8 mdd๋กœ 7๋ฐฐ ์ด์ƒ ์ฐจ์ด๊ฐ€ ๋‚ฌ์œผ๋ฉฐ, ์ด ์ฐจ๋Š” ๋‚จํ•ด์•ˆ๋ณด๋‹ค ํฌ๊ฒŒ ๋‚˜ํƒ€๋‚ฌ๋‹ค. ํŠนํžˆ ๊ฒจ์šธ์ฒ ์—๋Š” ๋†’์€ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ๋ณด์ด๋Š”๋ฐ, ์ด๋Š” ์„œํ•ด์•ˆ์€ ๊ฒจ์šธ์ฒ ์— ๋†’์€ ๋น„๋ž˜์—ผ๋ถ„์ด ์ธก์ •๋œ ์ด์ „ ์—ฐ๊ตฌ(Lee et al., 2010)์™€๋„ ๋™์ผํ•˜๋‹ค. ์ด์œ ๋Š” ์„œํ•ด์•ˆ์˜ ๊ฒฝ์šฐ ๊ฒจ์šธ์ฒ  ๋ถ์„œ๊ณ„์ ˆํ’์˜ ์˜ํ–ฅ์œผ๋กœ ๋ฐ”๋‹ค์—์„œ ๋ฐœ์ƒํ•œ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ๋‹ค๋Ÿ‰ ๋Œ€๊ธฐ์ค‘์— ๋ถ„ํฌํ•˜๊ธฐ ๋•Œ๋ฌธ์œผ๋กœ ์ƒ๊ฐ๋œ๋‹ค. ํ•œํŽธ ์—ฌ๋ฆ„์ฒ ์—๋Š” ๊ฒจ์šธ์ฒ ์— ๋น„ํ•ด ๋‚ฎ์€ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ๋ณด์˜€๋‹ค. ์ด๋Š” ๊ฒจ์šธ์ฒ  ๋ถ์„œํ’์— ๋น„ํ•ด ์—ฌ๋ฆ„์ฒ  ๋‚จ๋™ํ’์€ ํ’์†์ด ๋น ๋ฅด์ง€ ์•Š์•„ ์ „๋ฐ˜์ ์œผ๋กœ ๊ฒจ์šธ์ฒ ์— ๋น„ํ•˜์—ฌ ๋น„๋ž˜์—ผ๋ถ„์˜ ๋ฐœ์ƒ๋Ÿ‰๊ณผ ์ด๋™์ด ์ƒ๋Œ€์ ์œผ๋กœ ์ œํ•œ๋˜๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค.

Fig. 2 Monthly average airborne chlorides of offshore bridges located on the Southern coast
../../Resources/ksm/jksmi.2022.26.2.59/fig2.png
Fig. 3 Monthly average airborne chlorides of offshore bridges located in the Western coast
../../Resources/ksm/jksmi.2022.26.2.59/fig3.png

์ด์ƒ์œผ๋กœ ๋ณผ ๋•Œ, ๋‚จํ•ด์•ˆ๊ณผ ์„œํ•ด์•ˆ์˜ ๊ต๋Ÿ‰ ๋ชจ๋‘ ์—ฌ๋ฆ„์ฒ ๋ณด๋‹ค๋Š” ๊ฒจ์šธ์ฒ ์— ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ๋†’๊ฒŒ ๋‚˜ํƒ€๋‚˜๋Š” ์ด์œ ๋Š” ๊ฐ•ํ•œ ๋ถ์„œ๊ณ„์ ˆํ’์ด ๋งŽ์€ ๋น„๋ž˜์—ผ๋ถ„์„ ๋ฐœ์ƒ์‹œ์ผœ ๋ฉ€๋ฆฌ๊นŒ์ง€ ์ด๋™์‹œํ‚ค๊ธฐ ๋•Œ๋ฌธ์œผ๋กœ ์ƒ๊ฐ๋˜๋ฉฐ, ๋˜ํ•œ ์—ฌ๋ฆ„์ฒ  ์žฆ์€ ๊ฐ•์šฐ๋กœ ์ธํ•˜์—ฌ ๋Œ€๊ธฐ์ค‘์˜ ์—ผ๋ถ„์ด ์”ป๊ฒจ๋‚ด๋ ค๊ฐ€๋Š” ์˜ํ–ฅ๋„ ์žˆ๋‹ค๊ณ  ํŒ๋‹จ๋œ๋‹ค.

์„œํ•ด์•ˆ์˜ ๊ต๋Ÿ‰๋“ค๋„ ๋‚จํ•ด์•ˆ ๊ต๋Ÿ‰๊ณผ ๊ฐ™์ด ๋‘ ๋ถ€๋ฅ˜๋กœ ๋ถ„๋ฅ˜ํ•  ์ˆ˜ ์žˆ๋‹ค. ์ฒซ ๋ฒˆ์งธ๋Š” ์›”๋ณ„ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ๋น„๊ต์  ๋‚ฎ๊ณ , ์›”๋ณ„ ์ฐจ์ด๋„ ์ƒ๋Œ€์ ์œผ๋กœ ํฌ์ง€ ์•Š์€ ๊ต๋Ÿ‰์œผ๋กœ ์ด๋“ค์€ 0.4 ~ 7.8 mdd์˜ ๋ถ„ํฌ๋ฅผ ๋ณด์ด๋ฉฐ ์˜์ข…๋Œ€๊ต, ์„œํ•ด๋Œ€๊ต, ๋ชฉํฌ๋Œ€๊ต๊ฐ€ ์ด์— ์†ํ•œ๋‹ค(์ดํ•˜ C๊ตฐ). ๋‘ ๋ฒˆ์งธ๋Š” ์›”๋ณ„ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ๋Œ€์ฒด์ ์œผ๋กœ ๋†’์œผ๋ฉฐ, ๊ทธ ์ฐจ์ด๋„ ํฌ๊ฒŒ ๋‚˜๋Š” ๊ต๋Ÿ‰์œผ๋กœ 1.4 ~ 19 mdd์˜ ๋ถ„ํฌ๋ฅผ ๋ณด์ด๋ฉฐ ๊ณ ๊ตฐ์‚ฐ๋Œ€๊ต๊ฐ€ ์ด์— ์†ํ•œ๋‹ค(์ดํ•˜ D๊ตฐ). ํŠนํžˆ D๊ตฐ์€ 5์›”์„ ์ œ์™ธํ•˜๊ณ  C๊ตฐ ๊ต๋Ÿ‰๋“ค๋ณด๋‹ค๋„ ์ƒ๋‹นํžˆ ๋†’์€ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ๋‚˜ํƒ€๋‚ด๊ณ  ์žˆ์œผ๋ฉฐ, ์ƒ๋Œ€์ ์œผ๋กœ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ์ ์€ 5์›”๋„ C๊ตฐ์— ์†ํ•˜๋Š” 3๊ฐœ์˜ ๊ต๋Ÿ‰๋“ค์˜ ์ตœ๊ณ ์ ์— ๊ทผ์ ‘ํ•œ ์—ผ๋ถ„๋Ÿ‰์ด ์ธก์ •๋˜์—ˆ๋‹ค. ์ด๋Š” ๋‚จํ•ด์•ˆ๊ณผ ๋งˆ์ฐฌ๊ฐ€์ง€๋กœ ๊ณ ๊ตฐ์‚ฐ๋Œ€๊ต ์ฃผ๋ณ€์˜ ์ง€ํ˜•์  ํŠน์ง•์ด ๋†’์€ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์— ์˜ํ–ฅ์„ ๋ฏธ์นœ ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋˜๋ฉฐ, ์ด ๋˜ํ•œ ๋‹ค์Œ์ ˆ์—์„œ ์‚ดํŽด๋ณด๋„๋ก ํ•˜๊ฒ ๋‹ค.

3.2 ์ง€ํ˜•์  ํŠน์„ฑ์— ๋”ฐ๋ฅธ ํ•ด์ƒ๊ต๋Ÿ‰์˜ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ํŠน์ง•

์•ž์˜ ์ ˆ์—์„œ ๋ณธ ๊ฒƒ๊ณผ ๊ฐ™์ด ๋‚จํ•ด์•ˆ์˜ ๊ฑฐ๊ธˆ๋Œ€๊ต์™€ ์†Œ๋ก๋Œ€๊ต, ์„œํ•ด์•ˆ์˜ ๊ณ ๊ตฐ์‚ฐ๋Œ€๊ต๋Š” ๊ฐ™์€ ํ•ด์—ญ์˜ ๋‹ค๋ฅธ ํ•ด์ƒ๊ต๋Ÿ‰๋ณด๋‹ค ์—ผ๋ถ„๋Ÿ‰์ด ๋†’๊ฒŒ ์ธก์ •๋˜์—ˆ๊ณ , ์ด๋Ÿฌํ•œ ํ˜„์ƒ์€ ๊ฒจ์šธ์ฒ ์— ๋” ๋šœ๋ ทํ•˜๊ฒŒ ๋‚˜ํƒ€๋‚ฌ๋‹ค. ์ด๋Š” ํ•ด๋‹น ๊ต๋Ÿ‰์˜ ์ง€ํ˜•์  ์˜ํ–ฅ๊ณผ ๋ถ์„œํ’์ด ๋ถ€๋Š” ๊ฒจ์šธ์ฒ  ๋ฐ”๋žŒ์˜ ๋ฐฉํ–ฅ์— ๊ธฐ์ธํ•œ๋‹ค๊ณ  ์ƒ๊ฐ๋œ๋‹ค. ๋ถ์„œ ๋ฐฉํ–ฅ์„ ํŠน์ •ํ•˜๋Š” ์ด์œ ๋Š” ๊ฒจ์šธ์ฒ  ๊ณ„์ ˆํ’์ธ ๋ถ์„œํ’์ด ๋งค์šฐ ๊ฐ•ํ•˜๊ฒŒ ๋ถ€๋Š” ๊ฒฝํ–ฅ์ด ์žˆ๊ณ , ์šฐ๋ฆฌ๋‚˜๋ผ์˜ ๋น„๋ž˜์—ผ๋ถ„ ๋ฐœ์ƒ๊ณผ ์ด๋™์— ์žˆ์–ด ๊ฐ€์žฅ ํฐ ์˜ํ–ฅ์„ ์ฃผ๋Š” ์ธ์ž์ด๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค.

๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์— ์˜ํ–ฅ์„ ๋ฏธ์น˜๋Š” ์ฃผ๋œ ์ง€ํ˜•์  ํŠน์„ฑ์—๋Š” โ‘  ๋น„๋ž˜์—ผ๋ถ„์˜ ๋ฐœ์ƒ์‹œ์ ๊ณผ์˜ ๊ฑฐ๋ฆฌ, โ‘ก ๋ฐœ์ƒ๋Ÿ‰, โ‘ข ์žฅ์• ๋ฌผ์˜ ์œ ๋ฌด๊ฐ€ ์žˆ๋‹ค.

โ‘  ๋น„๋ž˜์—ผ๋ถ„์˜ ๋ฐœ์ƒ์‹œ์ ์ด๋ž€ ํŒŒ๋„์— ์˜ํ•ด ๋น„๋ž˜์—ผ๋ถ„์ด ๋ฐœ์ƒํ•˜๋Š” ์ง€์ ์„ ์˜๋ฏธํ•˜๋Š” ๊ฒƒ์œผ๋กœ, ํ•ด์ƒ๊ต๋Ÿ‰ ๊ทผ์ฒ˜์— ๋น„๋ž˜์—ผ๋ถ„์ด ๋ฐœ์ƒํ•˜๋Š” ๋ฐ”๋‹ค๊ฐ€ ์กด์žฌํ•˜์—ฌ์•ผ ํ•˜๋ฉฐ, ํŠนํžˆ ํ•ด์ƒ๊ต๋Ÿ‰์„ ๊ธฐ์ค€์œผ๋กœ ๋ฐ”๋žŒ์ด ๋ถˆ์–ด์˜ค๋Š” ๋ฐฉํ–ฅ์— ์žˆ์–ด์•ผ ํ•œ๋‹ค. ์„ ํ–‰์—ฐ๊ตฌ๊ฒฐ๊ณผ(KICT, 2006)๋ฅผ ๋ณด๋ฉด, ํ•ด์•ˆ(๋ฐœ์ƒ์‹œ์ )์—์„œ ๋ฐœ์ƒํ•œ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด 10%๊นŒ์ง€ ๊ฐ์†Œํ•˜๋Š” ๊ฑฐ๋ฆฌ๋Š” ํ•ด์•ˆ์œผ๋กœ๋ถ€ํ„ฐ ๊ฑฐ๋ฆฌ 1~2 km ์ด๋‚ด์ด๋‹ค. ๋”ฐ๋ผ์„œ ํ•ด์ƒ๊ต๋Ÿ‰์„ ๊ธฐ์ค€์œผ๋กœ ๋ฐ˜๊ฒฝ 1~2 km์—๋Š” ๋ฐ”๋‹ค๊ฐ€ ์žˆ์–ด์•ผ ์œ ์˜๋ฏธํ•œ ๋น„๋ž˜์—ผ๋ถ„์ด ๋ฐœ์ƒํ•  ์ˆ˜ ์žˆ๋‹ค๋Š” ๊ฒƒ์„ ์˜๋ฏธํ•œ๋‹ค.

โ‘ก ๋ฐœ์ƒ๋Ÿ‰์€ ๋ฐœ์ƒ์‹œ์ ์—์„œ ์ƒ๊ฒจ๋‚œ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ์˜๋ฏธํ•˜๋Š” ๊ฒƒ์œผ๋กœ, ์ˆ˜์‹ฌ, ํŒŒ๋„๊ทœ๋ชจ, ์กฐ์ˆ˜๊ฐ„๋งŒ์˜ ์ฐจ ๋“ฑ์˜ ์š”์ธ์œผ๋กœ ๊ฒฐ์ •๋˜๋Š”๋ฐ, ์ด๋Š” ๊ณง ์ง€์—ญ์ด๋‚˜ ํ•ด์—ญ์— ์˜ํ•ด ์ขŒ์šฐ๋˜๋Š” ํŠน์„ฑ์ด๋ผ๊ณ ๋„ ํ•  ์ˆ˜ ์žˆ๋‹ค. ์„ ํ–‰์—ฐ๊ตฌ(PWRI, 1993; KICT, 2006)์—์„œ ์‹ค์ œ ์ธก์ •ํ•œ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ์กฐ์‚ฌํ•œ ๊ฒฐ๊ณผ, ์ง€์—ญ์  ํŠน์„ฑ์„ ํ™•์ธํ•˜๊ณ  ์ด๋ฅผ ์ด์šฉํ•˜์—ฌ ์ง€์—ญ์  ์ฐจ์ด์— ๋”ฐ๋ฅธ ์ง€์—ญ๊ณ„์ˆ˜๋ฅผ ์‚ฐ์ถœํ•œ ๋ฐ” ์žˆ์œผ๋ฉฐ, ๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” ์ด๋ฅผ ์ฐธ๊ณ ํ•˜์—ฌ ๊ฐ ๊ต๋Ÿ‰๊ณผ ๊ฐ€๊นŒ์šด ์ง€์—ญ๊ณ„์ˆ˜ ๋˜๋Š” ์ง€ํ˜•์ด ์œ ์‚ฌํ•œ ์ง€์—ญ๊ณ„์ˆ˜๋ฅผ ๋ฐœ์ƒ๋Ÿ‰์œผ๋กœ ์‚ฌ์šฉํ•˜์˜€๋‹ค.

โ‘ข ์žฅ์• ๋ฌผ์€ ๋ฐœ์ƒ์‹œ์ ๊ณผ ํ•ด์ƒ๊ต๋Ÿ‰ ์‚ฌ์ด์— ๋น„๋ž˜์—ผ๋ถ„์„ ๊ฐ€๋กœ๋ง‰๋Š” ๊ฐ€๋ฆผ๋ง‰์„ ์˜๋ฏธํ•˜๋Š” ๊ฒƒ์ด๋‹ค. ๋ฐœ์ƒ์‹œ์ ์ด ์กด์žฌํ•˜๊ณ  ์—ฌ๊ธฐ์—์„œ ๋น„๋ž˜์—ผ๋ถ„์ด ๋‹ค๋Ÿ‰ ์ƒ์„ฑ๋˜์–ด๋„, ํ•ด์ƒ๊ต๋Ÿ‰๊ณผ์˜ ์‚ฌ์ด์— ๋†’์€ ์žฅ์• ๋ฌผ์ด ์žˆ๋‹ค๋ฉด ์ƒ์„ฑ๋œ ๋น„๋ž˜์—ผ๋ถ„์€ ๊ต๋Ÿ‰๊นŒ์ง€ ๋„๋‹ฌํ•˜์ง€ ๋ชปํ•œ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ์žฅ์• ๋ฌผ์ด ์žˆ๋”๋ผ๋„ ํ•ด์ƒ๊ต๋Ÿ‰๋ณด๋‹ค ๋‚ฎ์€ ๊ฒƒ์€ ์žฅ์• ๋ฌผ์˜ ์—ญํ• ์„ ๋ชปํ•  ๋ฟ๋งŒ ์•„๋‹ˆ๋ผ, ๋ฐ˜๋Œ€๋กœ ํŒŒ๋„๋ฅผ ๋ฐœ์ƒ์‹œํ‚ค๋Š” ์›์ธ์ด ๋˜์–ด ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ๋” ๋งŽ์ด ๋ฐœ์ƒ์‹œํ‚ค๋Š” ์—ญํ• ์„ ํ•˜๊ธฐ๋„ ํ•œ๋‹ค.

์œ„์™€ ๊ฐ™์€ ์ธ์ž๋ฅผ ๊ณ ๋ คํ•˜์—ฌ ๊ฐ ๊ต๋Ÿ‰๋ณ„ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ํŠน์„ฑ์„ ๋ณด๋ฉด ๋‹ค์Œ๊ณผ ๊ฐ™๋‹ค.

Fig. 4๋Š” ํ•ด์ƒ๊ต๋Ÿ‰๋“ค์˜ ์œ„์น˜์™€ ๊ฒจ์šธ์ฒ  ๋ถ์„œํ’์˜ ๋ฐ”๋žŒ๋ฐฉํ–ฅ์„ ํ‘œ์‹œํ•œ ๊ฒƒ์ด๋‹ค.

Fig. 4 Locations of Offshore bridges and wind direction in winter (Maps from https://Vemap.com, https://www.naver.com/)
../../Resources/ksm/jksmi.2022.26.2.59/fig4.png

์ง€๋ฆฌ์ ์œผ๋กœ ๋ณผ ๋•Œ, A๊ตฐ์˜ ๊ฑฐ๋ถ์„ ๋Œ€๊ต, ๋Œ์‚ฐ๋Œ€๊ต, ๋…ธ๋Ÿ‰๋Œ€๊ต๋Š” ๋‚จํ•ด์•ˆ์— ์œ„์น˜ํ•˜๊ณ  ์žˆ์–ด ๊ฒจ์šธ์ฒ ์—๋Š” ๋ถ์„œํ’์ด ๋ถˆ ๊ฒฝ์šฐ ๋‚ด๋ฅ™์—์„œ ํ•ด์•ˆ๋ฐฉํ–ฅ์œผ๋กœ ๋ฐ”๋žŒ์ด ๋ถˆ๊ธฐ ๋•Œ๋ฌธ์— ํ•ด์—ผ์ž…์ž์— ์˜ํ•œ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ์ ์–ด, ์—ฌ๋ฆ„๊ณผ ํฌ๊ฒŒ ๋‹ค๋ฅด์ง€ ์•Š๋Š” ํŠน์ง•์„ ๋ณด์ธ๋‹ค. ์ด ์ค‘ ๊ฑฐ๋ถ์„ ๋Œ€๊ต์™€ ๋Œ์‚ฐ๋Œ€๊ต๋Š” ์„œ๋กœ ๊ฐ€๊นŒ์ด ์œ„์น˜ํ•˜๊ณ  ์žˆ์–ด ๋ฐœ์ƒ๋Ÿ‰์—๋Š” ํฌ๊ฒŒ ์ฐจ์ด๊ฐ€ ์—†์„ ๊ฒƒ์œผ๋กœ ์ƒ๊ฐ๋œ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ๊ฑฐ๋ถ์„ ๋Œ€๊ต ์ธก์ • ์ง€์ ์˜ ๋ถ์„œ๋ฐฉํ–ฅ์— ๋‚ด๋ฅ™์ด ์œ„์น˜ํ•˜๊ณ  ์žˆ์–ด ๋ฐœ์ƒ์‹œ์ ์ด ์กด์žฌํ•˜์ง€ ์•Š์•„ ๋‚ฎ์€ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ๋ณด์ธ๋‹ค๊ณ  ์ƒ๊ฐ๋œ๋‹ค. ๋Œ์‚ฐ๋Œ€๊ต๋Š” ๋ฐœ์ƒ์‹œ์ ์€ ์žˆ์ง€๋งŒ, ๋ถ์„œ๋ฐฉํ–ฅ์— ์žฅ์• ๋ฌผ์ด ์žˆ์–ด ๋‚ฎ์€ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ๋ณด์ธ๋‹ค. ํ•œํŽธ ๋…ธ๋Ÿ‰๋Œ€๊ต๋Š” ๋„“์€ ๋ฐœ์ƒ์‹œ์ ๋„ ์กด์žฌํ•˜๊ณ  ์žฅ์• ๋ฌผ๋„ ์—†์œผ๋‚˜, ์ข์€ ๋งŒ์— ์œ„์น˜ํ•˜๊ณ  ์žˆ์–ด ํŒŒ๋„๊ฐ€ ๋ฐœ์ƒํ•˜์ง€ ์•Š์€ ํŠน์ง•์ด ์žˆ์–ด ๋‚ฎ์€ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ์ธก์ •๋œ ๊ฒƒ์œผ๋กœ ์ƒ๊ฐ๋œ๋‹ค. ๋˜ํ•œ ์•ž ์ ˆ์—์„œ ์„ค๋ช…ํ•œ ๋ฐ”์™€ ๊ฐ™์ด ์ธก์ •์ง€์ ์ด ๋‚ด๋ฅ™์•ˆ์ชฝ์— ์œ„์น˜ํ•˜๋Š” ๊ฒƒ๋„ ๊ทธ ์ด์œ ๊ฐ€ ๋œ๋‹ค.

๋ฐ˜๋ฉด B๊ตฐ์ธ ๊ฑฐ๊ธˆ๋Œ€๊ต์™€ ์†Œ๋ก๋Œ€๊ต๋Š” ๋‚จํ•ด์•ˆ์— ์œ„์น˜ํ•˜๊ณ  ์žˆ์–ด ๋ฐœ์ƒ๋Ÿ‰์€ A๊ตฐ๊ณผ ๋น„์Šทํ•˜์ง€๋งŒ, ๋‚ด๋ฅ™๊ณผ ๊ต๋Ÿ‰์‚ฌ์ด์— ์ง์„ ๊ฑฐ๋ฆฌ ์•ฝ 14 km ์ •๋„์˜ ๋น„๊ต์  ๋„“์€ ๋งŒ์ด ์œ„์น˜ํ•˜๊ณ  ์žˆ์–ด, ๋ถ์„œํ’์ด ๋ถˆ ๊ฒฝ์šฐ, ์ด ๋งŒ์—์„œ ์—ผ๋ถ„์ด ๋‹ค๋Ÿ‰ ๋ฐœ์ƒํ•˜๊ณ , ๋˜ํ•œ ๋ฐœ์ƒ์‹œ์ ๊ณผ ๊ต๋Ÿ‰์‚ฌ์ด์— ์žฅ์• ๋ฌผ์ด ์—†์–ด ๋ฐœ์ƒํ•œ ์—ผ๋ถ„์ด ๋‹ค๋Ÿ‰ ์ด๋™ํ•ด ์™€์„œ ๊ต๋Ÿ‰์˜ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ์ฆ๊ฐ€์— ์˜ํ–ฅ์„ ๋ฏธ์ณค๋‹ค๊ณ  ๋ถ„์„๋œ๋‹ค.

ํ•œํŽธ, ์„œํ•ด์•ˆ์€ ๊ฒจ์šธ์ฒ  ๋ถ์„œํ’์ด ๋ถˆ ๋•Œ, ํ•ด์•ˆ์—์„œ ๋‚ด๋ฅ™์œผ๋กœ ๋ฐ”๋žŒ์ด ๋ถˆ๊ธฐ ๋•Œ๋ฌธ์— ๊ฒจ์šธ์ฒ ์—๋Š” ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ์ฆ๊ฐ€ํ•œ๋‹ค. ๊ธฐ์ƒ์ฒญ ์ž๋ฃŒ์— ์˜ํ•˜๋ฉด ๋น„๋ž˜์—ผ๋ถ„ ์กฐ์‚ฌ๊ธฐ๊ฐ„ ์ค‘ ๊ฒจ์šธ์ฒ (2017๋…„ 12์›”~2018๋…„ 2์›”) ์„œํ•ด์•ˆ์˜ ํ’ํ–ฅ์€ ๋ถ์„œํ’์ด ์•ฝ 30 % ์ •๋„๋กœ ์šฐ์„ธํ•˜์˜€์œผ๋ฉฐ, ํ•ด์ƒ๊ต๋Ÿ‰์ด ๋†“์—ฌ์ง„ ์œ„์น˜์—์„œ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์˜ ์ฆ๊ฐ€์— ์˜ํ–ฅ์„ ์ค„ ์ˆ˜ ์žˆ๋Š” ๋ถํ’๊ณผ ์„œํ’๊นŒ์ง€ ํฌํ•จํ•˜๋ฉด ์•ฝ 50 %๊นŒ์ง€ ์ฐจ์ง€ํ•œ๋‹ค. ๊ทธ๋ฆฌ๊ณ , ์ด ๋•Œ ํ‰๊ท  ํ’์†์€ 3.2 m/s๋กœ, ์กฐ์‚ฌ๊ธฐ๊ฐ„์˜ ๋ด„๊ณผ ๊ฐ€์„, ์—ฌ๋ฆ„์˜ ํ’์†์ธ 2.9 m/s, 2.8 m/s, 2.6 m/s ๋ณด๋‹ค ๋†’๊ฒŒ ๋‚˜ํƒ€๋‚ฌ๋‹ค. ์ด๋Ÿฌํ•œ ์ด์œ ๋กœ ์•ž์˜ Fig. 3์—์„œ ๋ณด๋“ฏ์ด ๋ชจ๋“  ๊ต๋Ÿ‰์—์„œ ์—ฌ๋ฆ„์ฒ ๊ณผ ๋น„๊ตํ•˜์—ฌ ๊ฒจ์šธ์ฒ ์— ์—ผ๋ถ„๋Ÿ‰์ด ์ฆ๊ฐ€ํ•˜๊ณ  ์žˆ๋Š” ์ „ํ˜•์ ์ธ ์„œํ•ด์•ˆ์˜ ํŠน์ง•์„ ๋ณด์ด๊ณ  ์žˆ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜, ์ด ์ค‘์—์„œ๋„ C๊ตฐ์€ D๊ตฐ๊ณผ ๋น„๊ตํ•˜์—ฌ ๋‹ค์†Œ ๋‚ฎ์€ ๊ฒฝํ–ฅ์„ ๋ณด์ด๋Š”๋ฐ, C๊ตฐ์—๋Š” ์˜์ข…๋Œ€๊ต, ์„œํ•ด๋Œ€๊ต, ๋ชฉํฌ๋Œ€๊ต๊ฐ€ ํ•ด๋‹น๋œ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ์„œํ•ด๋Œ€๊ต์™€ ๋ชฉํฌ๋Œ€๊ต๋Š” ์ฃผ์œ„์— ์ž‘์€ ์„ฌ๋“ค์ด๋‚˜ ์ธ๊ณต๊ตฌ์กฐ๋ฌผ๋กœ ๋‘˜๋Ÿฌ์‹ธ์—ฌ ์žˆ์–ด ๋ฐœ์ƒ์‹œ์ ์ด ์ข์€ ํŠน์ง•์ด ์žˆ์œผ๋ฉฐ, ๋ถ์„œ๋ฐฉํ–ฅ์— ์žฅ์• ๋ฌผ๋„ ์กด์žฌํ•œ๋‹ค. ์˜์ข…๋Œ€๊ต๋Š” ์•ž์˜ ๋‘ ๊ต๋Ÿ‰๊ณผ ๊ฐ™์€ ์ง€ํ˜•์  ํŠน์„ฑ ์™ธ์— ๊ต๋Ÿ‰ ์ฃผ์œ„๊ฐ€ ๋ป˜์ด ํ˜•์„ฑ๋˜์–ด ์žˆ๊ณ  ์ˆ˜์‹ฌ์ด ๋‚ฎ์•„ ํŒŒ๋„๊ฐ€ ๋ฐœ์ƒํ•˜๊ธฐ ์–ด๋ ค์šด ํ™˜๊ฒฝ์ด๋‹ค. ์ด ๊ฐ™์€ ์ด์œ ๋กœ ์˜์ข…๋Œ€๊ต๋Š” ์•ž์˜ ๋‘ ๊ต๋Ÿ‰๋ณด๋‹ค 1๋…„ ๋‚ด๋‚ด ๋” ๋‚ฎ์€ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ๋ณด์ด๋Š” ๊ฒƒ์œผ๋กœ ์ƒ๊ฐ๋œ๋‹ค.

์ด์— ๋ฐ˜ํ•ด D๊ตฐ์ธ ๊ณ ๊ตฐ์‚ฐ๋Œ€๊ต๋Š” ๊ฒจ์šธ์ฒ ์— ๊ฐ•ํ•œ ๋ถ์„œํ’์— ์˜ํ•ด ๋„“์€ ๋ฐœ์ƒ์‹œ์ ์—์„œ ๋น„๋ž˜์—ผ๋ถ„์ด ๋‹ค๋Ÿ‰ ๋ฐœ์ƒํ•˜๊ณ , ๋ถ์„œ๋ฐฉํ–ฅ์— ์žฅ์• ๋ฌผ ์—ญํ• ์„ ํ•  ์ง€ํ˜•์ด ์—†์–ด ๋ฐ”๋‹ค์—์„œ ๋ฐœ์ƒํ•œ ์—ผ๋ถ„์ด ๋‹ค๋Ÿ‰ ๊ต๋Ÿ‰๊นŒ์ง€ ๋„๋‹ฌํ•˜์˜€๊ธฐ ๋•Œ๋ฌธ์— C๊ตฐ์— ๋น„ํ•ด์„œ ๊ฒจ์šธ์ฒ  ์—ผ๋ถ„๋Ÿ‰์ด ํฌ๊ฒŒ ์ธก์ •๋œ ๊ฒƒ์œผ๋กœ ๋ถ„์„๋œ๋‹ค.

์ด์ƒ์— ์„œ์ˆ ํ•œ ํ•ด์ƒ๊ต๋Ÿ‰์˜ ์ง€ํ˜•์  ํŠน์„ฑ๋“ค์„ ์ •๋ฆฌํ•˜๋ฉด Table 2์™€ ๊ฐ™๋‹ค. ์—ฌ๊ธฐ์„œ ๋ฐœ์ƒ์‹œ์ ์€ ์ธก์ •์ ์„ ๊ธฐ์ค€์œผ๋กœ ๋ถ์„œ์ชฝ์— ๋ฐ”๋‹ค๊ฐ€ ์žˆ๊ณ  ํŒŒ๋„์— ์˜ํ•ด ๋น„๋ž˜์—ผ๋ถ„์ด ์ž˜ ์ƒ์„ฑ๋˜๋Š” ํ™˜๊ฒฝ์ธ ๊ฒฝ์šฐ โ—‹, ๋ฐ”๋‹ค๊ฐ€ ์กด์žฌํ•˜์ง€๋งŒ ๋น„๋ž˜์—ผ๋ถ„์ด ์ƒ์„ฑ๋˜๋Š” ์‹œ์ ์ด ์ธก์ •์ง€์ ๊ณผ ๋‹ค์†Œ ๋ฉ€๊ฑฐ๋‚˜ ๋งŒ์œผ๋กœ ๋‘˜๋Ÿฌ์‹ธ์—ฌ ๋น„๋ž˜์—ผ๋ถ„ ์ƒ์„ฑ์ด ๋งŽ์ง€ ์•Š์€ ๊ฒฝ์šฐ โ–ณ, ๊ทธ๋ฆฌ๊ณ  ๋ถ์„œ์ชฝ์— ๋ฐ”๋‹ค๊ฐ€ ์กด์žฌํ•˜์ง€ ์•Š๋Š” ๊ฒฝ์šฐ๋Š” ร— ๋กœ ๊ตฌ๋ถ„ํ•˜์˜€๋‹ค.

Table 2 Topographic characteristics of each offshore bridges

Coastal zone

Bridge name

Airborne chlorides occurring point

Area index

Obstacles

Classification

Southern Coast

Geobukseon brg.

ร—

0.9

ร—

A

Dolsan brg.

โ–ณ

0.9

โ—‹

Noryang brg.

โ—‹

0.9

ร—

Geogeum brg.

โ—‹

1.0

ร—

B

Sorok brg.

โ—‹

1.0

ร—

Western Coast

Youngjong brg.

โ—‹

1.1

โ—‹

C

Seohae brg.

โ–ณ

1.0

โ—‹

Mokpo brg.

โ–ณ

1.0

โ—‹

Gogunsan brg.

โ—‹

2.2

ร—

D

์ด์ƒ์œผ๋กœ ๋ณด์•„, ํ•ด์ƒ๊ต๋Ÿ‰์œผ๋กœ ๋‚ ์•„ ๋“ค์–ด์˜ค๋Š” ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ํšจ๊ณผ์ ์œผ๋กœ ์ถ”์ •ํ•˜๊ธฐ ์œ„ํ•ด์„œ๋Š” ๊ต๋Ÿ‰์„ ๊ธฐ์ค€์œผ๋กœ ๋ถ์„œ ๋ฐฉํ–ฅ์ชฝ์— ๋น„๋ž˜์—ผ๋ถ„์ด ๋ฐœ์ƒํ•˜๋Š” ์‹œ์ ์กด์žฌ ๋ฐ ๊ฑฐ๋ฆฌ, ๋ฐœ์ƒ๋Ÿ‰ ํ˜น์€ ๋น„๋ž˜์—ผ๋ถ„์ด ๋‚ ์•„ ๋“ค์–ด์˜ค๋Š”๋ฐ ์ง€์žฅ์„ ์ฃผ๋Š” ์žฅ์• ๋ฌผ์ด ์žˆ๋Š”์ง€๋ฅผ ํŒŒ์•…ํ•˜๋Š” ๊ฒƒ์€ ๋งค์šฐ ์ค‘์š”ํ•˜๋‹ค๊ณ  ํ•  ์ˆ˜ ์žˆ๋‹ค.

3.3 ํ•ด์ƒ๊ต๋Ÿ‰์˜ ๋†’์ด๋ณ„ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ๋ถ„์„

9๊ฐœ ํ•ด์ƒ๊ต๋Ÿ‰์˜ ๋†’์ด์— ๋”ฐ๋ฅธ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ๋ถ„์„ํ•˜์˜€๋‹ค. ์—ฌ๊ธฐ์—์„œ๋Š” ์ œ์„ค์—ผ๋ถ„์— ์˜ํ•œ ๋Œ€๊ธฐ์ค‘ ์—ผ๋ถ„๋Ÿ‰ ์ฆ๊ฐ€๋ถ„์„ ๋ฐฐ์ œํ•˜๊ณ  ๋†’์ด์— ๋”ฐ๋ฅธ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰๋งŒ์„ ๋ถ„์„ํ•˜๊ธฐ ์œ„ํ•˜์—ฌ ๊ธฐ์ƒ์ฒญ์— ๊ฐ•์„ค์ผ์ˆ˜๊ฐ€ ๊ธฐ๋ก๋˜์–ด ์ œ์„ค์ œ๊ฐ€ ์‚ดํฌ๋œ ๊ธฐ๊ฐ„(๊ฑฐ๋ถ์„ ๋Œ€๊ต, ๋Œ์‚ฐ๋Œ€๊ต: 12์›”~3์›”, ์˜์ข…๋Œ€๊ต, ๋ชฉํฌ๋Œ€๊ต, ๊ณ ๊ตฐ์‚ฐ๋Œ€๊ต: 11์›”~3์›”)์˜ ์—ผ๋ถ„๋Ÿ‰ ๋ฐ์ดํ„ฐ๋Š” ์ œ์™ธํ•˜์˜€๋‹ค.

๋‚จํ•ด์•ˆ์— ์œ„์น˜ํ•œ 5๊ฐœ ๊ต๋Ÿ‰์˜ ๋†’์ด๋ณ„ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ๋ถ„ํฌ๋ฅผ Fig. 5์— ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ๋ชจ๋“  ๊ต๋Ÿ‰์—์„œ ํ•ด์ˆ˜๋ฉด์—์„œ๋ถ€ํ„ฐ ๋†’์ด๊ฐ€ ๋†’์•„์งˆ์ˆ˜๋ก ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์€ ๊ฐ์†Œํ–ˆ๋‹ค. ํŒŒ๋„์— ์˜ํ•ด ๋ฐœ์ƒํ•˜๋Š” ํ•ด์—ผ์ž…์ž๋Š” ๋ฐ”๋žŒ์— ์˜ํ•ด ์ด๋™ํ•˜๋ฉฐ, ๋”ฐ๋ผ์„œ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์€ ํ•ด์ˆ˜๋ฉด์—์„œ ๊ฐ€๊นŒ์šด ์ฃผํƒ‘ํ•˜๋‹จ์—์„œ ๊ฐ€์žฅ ๋†’๊ฒŒ ์ธก์ •๋˜๊ณ  ์ฃผํƒ‘์ƒ๋ถ€๋กœ ์˜ฌ๋ผ๊ฐˆ์ˆ˜๋ก ๋‚ฎ์€ ๊ฐ’์„ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. A๊ตฐ์— ์†ํ•˜๋Š” ๊ฑฐ๋ถ์„ ๋Œ€๊ต์™€ ๋Œ์‚ฐ๋Œ€๊ต, ๋…ธ๋Ÿ‰๋Œ€๊ต๋Š” ์ „์ฒด์ ์ธ ๊ฒฝํ–ฅ์€ ๋†’์ด๊ฐ€ ๋†’์•„์งˆ์ˆ˜๋ก ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์€ ๊ฐ์†Œํ•˜์ง€๋งŒ ๊ทธ ์ฐจ์ด๋Š” ํฌ์ง€ ์•Š๊ณ  ํŠนํžˆ ๋…ธ๋Ÿ‰๋Œ€๊ต๋Š” ๋†’์ด 150 m์˜ ์ตœ์ƒ๋‹จ์—์„œ๋„ ๋†’์ด 5 m์™€ ์ฐจ์ด๊ฐ€ ๊ฑฐ์˜ ์—†๋Š” ํŠน์ง•์„ ๋ณด์ธ๋‹ค. A๊ตฐ ๊ต๋Ÿ‰๋“ค์€ ๊ต๊ฐํ•˜๋‹จ ๊ธฐ์ค€ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด 2.0 mdd ์ดํ•˜๋กœ ๋‚ฎ์€ ๊ฐ’์„ ๋‚˜ํƒ€๋‚ฌ์œผ๋ฉฐ ํŠนํžˆ, ๋…ธ๋Ÿ‰๋Œ€๊ต์˜ ๊ฒฝ์šฐ 1.5 mdd๋ณด๋‹ค ๋‚ฎ์€ ๊ฐ’์œผ๋กœ ๋‚˜ํƒ€๋‚ฌ๋‹ค. B๊ตฐ์— ์†ํ•˜๋Š” ๊ฑฐ๊ธˆ๋Œ€๊ต์™€ ์†Œ๋ก๋Œ€๊ต๋„ ๋†’์ด๊ฐ€ ๋†’์„์ˆ˜๋ก ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์€ ๊ฐ์†Œํ•˜๋Š” ๊ฒฝํ–ฅ์€ ์ผ์น˜ํ•˜์ง€๋งŒ ๊ทธ ์ฐจ์ด๊ฐ€ ๋šœ๋ ท์ด ๋‚˜ํƒ€๋‚˜๊ณ , A๊ตฐ ๊ต๋Ÿ‰๋ณด๋‹ค ๋ชจ๋“  ๋†’์ด์—์„œ ๋†’์€ ์—ผ๋ถ„๋Ÿ‰์„ ๋ณด์ด๋ฉฐ, ๊ต๊ฐํ•˜๋‹จ ๊ธฐ์ค€ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด 4.0 mdd๋กœ ๋†’์€ ๊ฐ’์„ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค.

Fig. 6์— ์„œํ•ด์•ˆ์— ์œ„์น˜ํ•œ 4๊ฐœ ๊ต๋Ÿ‰์˜ ๋†’์ด๋ณ„ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ๋ถ„ํฌ๋ฅผ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ์„œํ•ด๋Œ€๊ต์™€ ๊ณ ๊ตฐ์‚ฐ๋Œ€๊ต๋Š” ํ•ด์ˆ˜๋ฉด์œผ๋กœ๋ถ€ํ„ฐ ๋†’์ด๊ฐ€ ๋†’์•„์ง์— ๋”ฐ๋ผ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ๊ฐ์†Œํ•˜๋Š” ๊ฒฝํ–ฅ์ด ๋‚จํ•ด์•ˆ์˜ B๊ตฐ ๊ต๋Ÿ‰๊ณผ ์œ ์‚ฌํ•˜์˜€์œผ๋‚˜, ์˜์ข…๋Œ€๊ต์™€ ๋ชฉํฌ๋Œ€๊ต๋Š” ๋†’์ด์— ๋”ฐ๋ผ ์ƒ๋Œ€์ ์œผ๋กœ ์ฐจ์ด๊ฐ€ ์ ๊ฒŒ ๋‚˜ํƒ€๋‚ฌ๋‹ค. ๋˜ํ•œ ๊ต๊ฐ ํ•˜๋‹จ๋ถ€ ๊ธฐ์ค€ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ์˜์ข…๋Œ€๊ต๋Š” 1.0 mdd ์ดํ•˜, ์„œํ•ด๋Œ€๊ต์™€ ๋ชฉํฌ๋Œ€๊ต๋Š” 2.0 ~ 4.0 mdd, ๊ณ ๊ตฐ์‚ฐ๋Œ€๊ต๋Š” 4.0 mdd ์ด์ƒ์œผ๋กœ ์ธก์ •๋˜์—ˆ๋‹ค.

Fig. 5 Average airborne chlorides according to the height of offshore bridges located in the Southern coast
../../Resources/ksm/jksmi.2022.26.2.59/fig5.png
Fig. 6 Average airborne chlorides according to the height of offshore bridges located on the Western coast
../../Resources/ksm/jksmi.2022.26.2.59/fig6.png

์˜์ข…๋Œ€๊ต์™€ ๋…ธ๋Ÿ‰๋Œ€๊ต์˜ ๊ฒฝ์šฐ๋Š” ๊ต๊ฐ ํ•˜๋‹จ๋ถ€์˜ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ๊ฐ๊ฐ 1.0๊ณผ 1.5 mdd ์ดํ•˜๋กœ 4๊ตฌ๊ฐ„์— ํ•ด๋‹น๋˜๊ณ , ๋‹ค๋ฅธ ๊ต๋Ÿ‰๋“ค๊ณผ ๋‹ฌ๋ฆฌ ๋…ํŠนํ•œ ๋น„๋ž˜์—ผ๋ถ„ ํ™˜๊ฒฝ์„ ๊ฐ€์ง„ ๊ต๋Ÿ‰์œผ๋กœ์„œ ๋†’์ด์— ๋”ฐ๋ฅธ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ์–‘์ƒ์ด ๋‹ค๋ฅธ ๊ต๋Ÿ‰๋“ค๊ณผ๋Š” ๋‹ค๋ฅด๊ฒŒ ๋‚˜ํƒ€๋‚ฌ๋‹ค. ๋†’์ด์— ๋”ฐ๋ผ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ๊ฐ์†Œํ•˜๋Š” ๋‹ค๋ฅธ ๊ต๋Ÿ‰๋“ค๊ณผ ๋‹ฌ๋ฆฌ, ์˜์ข…๋Œ€๊ต๋Š” ๋†’์ด 50 m๊นŒ์ง€๋Š” ์ฆ๊ฐ€ํ•˜๋‹ค๊ฐ€ ์ฃผํƒ‘ ์ตœ์ƒ์ธต์—์„œ๋Š” ํฌ๊ฒŒ ๊ฐ์†Œํ•˜๋Š” ๊ฒฝํ–ฅ์„ ๋ณด์ด๋ฉฐ, ๋…ธ๋Ÿ‰๋Œ€๊ต๋Š” ๋†’์ด์— ๋”ฐ๋ฅธ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์˜ ์ฐจ์ด๊ฐ€ ํฌ๊ฒŒ ๋‚˜์ง€ ์•Š๋Š”๋‹ค. ์ผ๋ฐ˜์ ์œผ๋กœ ํ•ด์•ˆ๊ฐ€์—์„œ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์€ ํ•ด์ˆ˜๋ฉด์— ๊ฐ€๊นŒ์šด ๋†’์ด์ผ์ˆ˜๋ก ๋†’๋‹ค๊ณ  ๋ณด๊ณ ๋˜์—ˆ๋Š”๋ฐ(Sasaki et al., 2016, Yamada et al., 1998), ์˜์ข…๋Œ€๊ต์™€ ๋…ธ๋Ÿ‰๋Œ€๊ต์˜ ๊ฒฝ์šฐ์—๋Š” ์ด๋Ÿฌํ•œ ๊ฒฝํ–ฅ์„ ๋”ฐ๋ฅด์ง€ ์•Š์•˜๋‹ค. Yamada et al.,(1998)์€ ๋Š” ํ’์†์— ๋”ฐ๋ฅธ ์ดˆ๊ธฐ๋ฐœ์ƒ ์—ผ๋ถ„๋Ÿ‰๊ณผ ํ•ด์—ผ์ž…์ž์˜ ๋ฐ˜๊ฒฝ์— ๋”ฐ๋ฅธ ์ดˆ๊ธฐ ์นจ๊ฐ•์†๋„, ์žฅ์• ๋ฌผ์— ์˜ํ•œ ์ฐจํ์ •๋„๊ฐ€ ๋†’์ด์— ๋”ฐ๋ฅธ ๋Œ€๊ธฐ์ค‘ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์— ์˜ํ–ฅ์„ ๋ฏธ์นœ๋‹ค๊ณ  ๋ถ„์„ํ•˜์˜€๋‹ค. ๋ฐœ์ƒ ์—ผ๋ถ„๋Ÿ‰์ด ๋งค์šฐ ์ž‘์€ ๊ฒฝ์šฐ ํ•ด์—ผ์ž…์ž์˜ ๋ฐ˜๊ฒฝ๋„ ์ž‘์•„์ง€๊ณ  ๋ฌด๊ฒŒ๋„ ๊ฐ€๋ฒผ์›Œ์ง€๋Š”๋ฐ, ์˜์ข…๋Œ€๊ต์˜ ๊ฒฝ์šฐ, 3.2์ ˆ์—์„œ ์„ค๋ช…ํ•œ ๋ฐ”์™€ ๊ฐ™์ด ์ฃผ์œ„์— ๋ป˜์ด ํ˜•์„ฑ๋˜์–ด ์žˆ๊ณ  ์ˆ˜์‹ฌ์ด ๋‚ฎ์•„ ํŒŒ๋„์˜ ๋ฐœ์ƒ๋Ÿ‰์ด ์ ์–ด ์ดˆ๊ธฐ๋ฐœ์ƒ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ์ž์ฒด๊ฐ€ ์ ๊ณ , ํ•ด์—ผ์ž…์ž๊ฐ€ ๋งค์šฐ ์ž‘์„ ๊ฒƒ์œผ๋กœ ์ถ”์ •๋œ๋‹ค. ์‹ค์ œ ํŒŒ๋„์— ์˜ํ•ด ๊ฐ€์žฅ ๋งŽ์€ ๋น„๋ž˜์—ผ๋ถ„์ด ๋„๋‹ฌํ•˜๋Š” ๊ต๊ฐํ•˜๋‹จ๋ถ€์—์„œ์˜ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰๋„ ์•ฝ 1.0 mdd๋กœ์„œ ๋งค์šฐ ์ ์€ ์–‘์„ ๋‚˜ํƒ€๋‚ด๊ณ  ์žˆ๋‹ค. ์ด์™€ ๊ฐ™์ด ํ•ด์ˆ˜๋ฉด๊ณผ ์ธ์ ‘ํ•œ ๋†’์ด์—์„œ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด 1.0 mdd ์ „ํ›„๋กœ ๋งค์šฐ ์ ๊ฒŒ ๋‚˜ํƒ€๋‚˜๋Š” ๊ฒฝ์šฐ๋Š” ๋†’์ด์— ๋”ฐ๋ผ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ๊ฐ์†Œํ•˜๋Š” ๊ฒฝํ–ฅ์ด ๋‚˜ํƒ€๋‚˜์ง€ ์•Š์Œ์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ์—ˆ๋‹ค.

์ด์ƒ์˜ ๋ถ„์„์œผ๋กœ ๋ณผ ๋•Œ, ํ•ด์ƒ๊ต๋Ÿ‰์˜ ๋†’์ด๋ณ„ ๋น„๋ž˜์—ผ๋ถ„ ๊ฐ์†Œ๊ฒฝํ–ฅ์€ ๊ต๊ฐ ํ•˜๋‹จ๋ถ€์˜ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์— ํฌ๊ฒŒ ์ขŒ์šฐ๋˜๋Š” ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋œ๋‹ค. ์ด์—, ๊ต๊ฐ ํ•˜๋‹จ๋ถ€ ๊ธฐ์ค€ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์— ๋”ฐ๋ผ 4.0 mdd ์ด์ƒ(1๊ตฌ๊ฐ„), 4.0 ~ 2.0 mdd(2๊ตฌ๊ฐ„), 2.0 ~ 1.5 mdd(3๊ตฌ๊ฐ„), 1.5 mdd ๋ฏธ๋งŒ(4๊ตฌ๊ฐ„)์˜ ์ด 4๊ฐœ์˜ ๊ตฌ๊ฐ„์œผ๋กœ ๋‚˜๋ˆŒ ์ˆ˜ ์žˆ๋‹ค. ์ด ์ค‘ 1.5 mdd ๋ฏธ๋งŒ์˜ ํ™˜๊ฒฝ์„ ์ œ์™ธํ•˜๊ณ  ์ƒ๊ธฐ์˜ ๋ฐ์ดํ„ฐ๋ฅผ ๊ธฐ๋ฐ˜์œผ๋กœ ํ•ด์ƒ ๋†’์ด์— ๋”ฐ๋ฅธ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ๊ฐ์†Œ๋Ÿ‰์— ๋Œ€ํ•œ ์—ดํ™”ํ™˜๊ฒฝ ๋ชจ๋ธ์„ Fig. 7์— ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. 3๊ตฌ๊ฐ„(2.0 ~ 1.5 mdd)์ธ ๊ฑฐ๋ถ์„ ๋Œ€๊ต์™€ ๋Œ์‚ฐ๋Œ€๊ต์˜ ๋ฐ์ดํ„ฐ๋กœ ๋„์ถœํ•ด๋‚ธ ๋น„๋ž˜์—ผ๋ถ„ ๊ฐ์†Œ์‹์€ ์‹ (1) , 2๊ตฌ๊ฐ„(4.0 ~ 2.0 mdd)์ธ ์„œํ•ด๋Œ€๊ต์™€ ๋ชฉํฌ๋Œ€๊ต์˜ ๋น„๋ž˜์—ผ๋ถ„ ๊ฐ์†Œ์‹์€ ์‹ (2), 1๊ตฌ๊ฐ„(4.0 mdd์ด์ƒ)์ธ ๊ฑฐ๊ธˆ๋Œ€๊ต์™€ ์†Œ๋ก๋Œ€๊ต, ๊ณ ๊ตฐ์‚ฐ๋Œ€๊ต์˜ ๋น„๋ž˜์—ผ๋ถ„ ๊ฐ์†Œ์‹์€ ์‹ (3)๊ณผ ๊ฐ™๋‹ค.

(1)
$y_{d}=1.6928e^{-0.011x}$
(2)
$y_{d}=3.0532e^{-0.005x}$
(3)
$y_{d}=7.794x^{-0.239}$

์—ฌ๊ธฐ์—์„œ $x$: ๋†’์ด(m), $y_{d}$ : ๋†’์ด($x$)์—์„œ์˜ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰(mdd)์ด๋‹ค.

์ด๋“ค์˜ ๋†’์ด์— ๋Œ€ํ•œ ๊ฐ์†Œ์œจ์„ Fig. 8์— ๋‚˜ํƒ€๋‚ด์—ˆ์œผ๋ฉฐ, ์ด๋Š” 3๊ฐœ์˜ ์—ดํ™”ํ™˜๊ฒฝ ๋ชจ๋ธ์˜ ๊ฐ์†Œ์œจ์— ๋Œ€ํ•œ ์ง์ ‘์ ์ธ ๋น„๊ต๋ฅผ ์œ„ํ•ด ๊ต๊ฐ ๋†’์ด์— ๋”ฐ๋ฅธ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์˜ ๊ฐ์†Œ๋Ÿ‰์„ ๊ฐ์†Œ์œจ๋กœ ํ™˜์‚ฐํ•˜์—ฌ ๋‚˜ํƒ€๋‚ธ ๊ฒƒ์ด๋‹ค. ์ด ์ค‘ Fig. 7์—์„œ์™€ ๊ฐ™์ด 2๊ตฌ๊ฐ„๊ณผ 3๊ตฌ๊ฐ„์€ ๊ฐ์†Œ์„ ์˜ ๊ธฐ์šธ๊ธฐ๊ฐ€ ์œ ์‚ฌํ•˜์—ฌ ๊ทธ ๊ฐ์†Œ์œจ์— ์ฐจ์ด๊ฐ€ ์—†๋Š” ๊ฒƒ์œผ๋กœ ๊ฐ„์ฃผ๋˜๋ฏ€๋กœ Fig. 8์—์„œ๋Š” ์ด ๋‘ ๊ตฌ๊ฐ„์„ ํ•œ ๊ฐœ์˜ ๋ชจ๋ธ๋กœ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ๊ฒฐ๊ณผ, ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด 4.0 mdd ์ด์ƒ์ธ ๋ชจ๋ธ์€ ๋†’์ด ์•ฝ 40~60 m๊นŒ์ง€๋Š” ๊ธ‰๊ฒฉํžˆ ๊ฐ์†Œํ•˜๋‹ค๊ฐ€ ๊ทธ ์ดํ›„์—๋Š” ๊ฐ์†Œ์œจ์ด ์™„๋งŒํ•ด์ง€๋Š” ์–‘์ƒ์„ ๋ณด์ธ๋‹ค. 4.0 ~ 1.5 mdd์ธ ๋ชจ๋ธ์—์„œ๋Š” ๊ฐ์†Œ์œจ์ด ์™„๋งŒํ•ด์ง€์ง€ ์•Š๊ณ  ๊ณ„์† ๊ฐ์†Œํ•˜๋Š” ๊ฒฝํ–ฅ์„ ๋ณด์ด๋ฉฐ ๋†’์ด 100 m ์ „ํ›„์—์„œ๋Š” 1๊ตฌ๊ฐ„์˜ ๊ฐ์†Œ์œจ๊ณผ ์œ ์‚ฌํ•œ ๊ฒฐ๊ณผ๊ฐ€ ๋‚˜ํƒ€๋‚ฌ๋‹ค. ๋‹จ, ์ด ๊ฒฐ๊ณผ์—์„œ 3๊ตฌ๊ฐ„์€ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ์ธก์ •ํ•œ ์ตœ๋Œ€ ๋†’์ด๊ฐ€ 25 m ์ดํ•˜์˜ ๋ฐ์ดํ„ฐ๋งŒ์œผ๋กœ ์˜ˆ์ธกํ•œ ๊ฒฐ๊ณผ๋กœ ํ•œ์ •๋˜๋ฉฐ, ๋” ๋†’์€ ๋†’์ด์—์„œ๋Š” 2๊ตฌ๊ฐ„์— ๋น„ํ•ด ๊ฐ์†Œ์œจ์ด ์ ์–ด์งˆ ์—ฌ์ง€๊ฐ€ ์žˆ๋‹ค๊ณ  ๋ณด์—ฌ์ง„๋‹ค.

Fig. 7 Reduction of airborne chlorides according to the height above sea level
../../Resources/ksm/jksmi.2022.26.2.59/fig7.png
Fig. 8 Decreasing rate of airborne chlorides according to the height above sea level
../../Resources/ksm/jksmi.2022.26.2.59/fig8.png

4. ๊ฒฐ ๋ก 

๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” ํ•ด์ƒ๊ต๋Ÿ‰์˜ ์›”๋ณ„, ๋†’์ด๋ณ„ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ๋ถ„ํฌ๋ฅผ ํŒŒ์•…ํ•˜๊ธฐ ์œ„ํ•˜์—ฌ, ๋‚จํ•ด์•ˆ๊ณผ ์„œํ•ด์•ˆ์˜ 9๊ฐœ ํ•ด์ƒ๊ต๋Ÿ‰์„ ๋Œ€์ƒ์œผ๋กœ ๋†’์ด๋ณ„๋กœ 1๋…„ ๋™์•ˆ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์„ ์กฐ์‚ฌํ•˜์—ฌ ์›”๋ณ„, ๋†’์ด๋ณ„ ํŠน์„ฑ์„ ๋ถ„์„ํ•˜์˜€๊ณ , ๋‹ค์Œ๊ณผ ๊ฐ™์€ ๊ฒฐ๋ก ์„ ์–ป์—ˆ๋‹ค.

1) ์›”๋ณ„ ๋น„๋ž˜์—ผ๋ถ„ ๋ถ„ํฌ๋Š” ๋‚จํ•ด์•ˆ ๊ต๋Ÿ‰์˜ ๊ฒฝ์šฐ 0.3 ~ 17.4 mdd, ์„œํ•ด์•ˆ ๊ต๋Ÿ‰์˜ ๊ฒฝ์šฐ 0.4 ~ 19.0 mdd๋กœ ๋ถ„ํฌํ•˜์˜€์œผ๋ฉฐ, ํŠน์ˆ˜ํ•œ ์ง€ํ˜•์  ์œ„์น˜์— ์žˆ๋Š” ๊ต๋Ÿ‰์„ ์ œ์™ธํ•˜๋ฉด ๋‚จํ•ด์•ˆ์ด ์„œํ•ด์•ˆ๋ณด๋‹ค ์—ฌ๋ฆ„๊ณผ ๊ฒจ์šธ์ฒ  ๋ชจ๋‘ ๋‚ฎ๊ฒŒ ๋‚˜ํƒ€๋‚ฌ๋‹ค.

2) ๋‚จํ•ด์•ˆ๊ณผ ์„œํ•ด์•ˆ ํ•ด์ƒ๊ต๋Ÿ‰์˜ ์›”๋ณ„ ๋น„๋ž˜์—ผ๋ถ„์€ ๊ฒจ์šธ์ฒ  ๋ถ์„œํ’์˜ ์˜ํ–ฅ์œผ๋กœ ๋ชจ๋‘ ์—ฌ๋ฆ„์ฒ ๋ณด๋‹ค๋Š” ๊ฒจ์šธ์ฒ ์— ๋†’๊ฒŒ ๋‚˜ํƒ€๋‚ฌ๋Š”๋ฐ, ๊ฒจ์šธ์ฒ  ๋‚จํ•ด์•ˆ๊ณผ ์„œํ•ด์•ˆ์˜ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰ ํŽธ์ฐจ๋Š” ๊ฐ ๊ฐ 15.1 mdd์™€ 17.4 mdd์ด๋ฉฐ, ์—ฌ๋ฆ„์ฒ ์€ ๊ฐ ๊ฐ 2.6 mdd์™€ 4.9 mdd์ด๋ฉฐ, ์ด์™€ ๋”๋ถˆ์–ด ์ง€์—ญ์  ํŽธ์ฐจ๋„ ๋‚˜ํƒ€๋‚ฌ๋‹ค. ์—ฌ๋ฆ„์ฒ ๋ณด๋‹ค ๊ฒจ์šธ์ฒ ์— ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ๋†’๊ฒŒ ๋‚˜ํƒ€๋‚˜๋Š” ์ด์œ ๋Š” ๊ฐ•ํ•œ ๋ถ์„œ๊ณ„์ ˆํ’์ด ๋งŽ์€ ๋น„๋ž˜์—ผ๋ถ„์„ ๋ฐœ์ƒ์‹œ์ผœ ๋ฉ€๋ฆฌ๊นŒ์ง€ ์ด๋™์‹œํ‚ค๊ธฐ ๋•Œ๋ฌธ์œผ๋กœ ์ƒ๊ฐ๋˜๋ฉฐ, ๋˜ํ•œ ์—ฌ๋ฆ„์ฒ  ์žฆ์€ ๊ฐ•์šฐ๋กœ ์ธํ•˜์—ฌ ๋Œ€๊ธฐ์ค‘์˜ ์—ผ๋ถ„์ด ์”ป๊ฒจ๋‚ด๋ ค๊ฐ€๋Š” ์˜ํ–ฅ๊ณผ ๋”๋ถˆ์–ด ์ธก์ •๊ธฐ๊ฐ„ ๋™์•ˆ ํƒœํ’์ด ์ง€๋‚˜๊ฐ€์ง€ ์•Š์€ ์˜ํ–ฅ๋„ ์žˆ๋‹ค๊ณ  ํŒ๋‹จ๋œ๋‹ค.

3) ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์— ์˜ํ–ฅ์„ ๋ฏธ์น˜๋Š” ์ง€ํ˜•์  ํŠน์ง•์œผ๋กœ๋Š” ๋น„๋ž˜์—ผ๋ถ„์˜ ๋ฐœ์ƒ์‹œ์  ์กด์žฌ ๋ฐ ๊ฑฐ๋ฆฌ, ๋ฐœ์ƒ๋Ÿ‰, ์žฅ์• ๋ฌผ์ด ์ค‘์š”ํ•œ ์—ญํ• ์„ ํ•˜๋Š” ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋˜๋ฉฐ, ์ด์— ๋”ฐ๋ผ ๊ฐ™์€ ํ•ด์—ญ์ด๋ผ๋„ ์ง€ํ˜•์  ์œ„์น˜์— ๋”ฐ๋ผ์„œ ๋†’์ด๋ณ„ ๊ฒฝํ–ฅ๋„ ํฌ๊ฒŒ ์ฐจ์ด๊ฐ€ ํ‰๊ท  3.0 mdd, ์ตœ๊ณ  19.0 mdd๊นŒ์ง€ ๋ฐœ์ƒํ•˜์˜€๋‹ค.

4) ๋‚จํ•ด์•ˆ์˜ ๊ต๋Ÿ‰๋“ค ์ค‘ ๊ต๋Ÿ‰์˜ ๋ถ์„œ์ชฝ์— ๋ฐ”๋‹ค๊ฐ€ ์žˆ๋Š” ๊ณณ์— ์œ„์น˜ํ•œ ๊ต๋Ÿ‰๋“ค์€ ๊ทธ๋ ‡์ง€ ์•Š์€ ๊ต๋Ÿ‰๋“ค๊ณผ ๋น„๊ตํ•˜์—ฌ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ๋†’๊ฒŒ ์ธก์ •๋˜์—ˆ๊ณ , ๋†’์ด์— ๋”ฐ๋ฅธ ๊ฐ์†Œ์œจ๋„ ๋” ํฌ๊ฒŒ ๋‚˜ํƒ€๋‚ฌ์œผ๋ฉฐ, ์„œํ•ด์•ˆ์˜ ๊ต๋Ÿ‰๋“ค ์ค‘์—์„œ๋Š” ๋ถ์„œ์ชฝ์— ์žฅ์• ๋ฌผ์ด ์—†๋Š” ๊ณ ๊ตฐ์‚ฐ๋Œ€๊ต๊ฐ€ ์„œํ•ด์•ˆ์˜ ๋‹ค๋ฅธ ๊ต๋Ÿ‰๋“ค๊ณผ ๋น„๊ตํ•˜์—ฌ ๋ชจ๋“  ๋†’์ด์—์„œ ๊ฐ€์žฅ ํฐ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์ด ๋‚˜ํƒ€๋‚ฌ๋‹ค.

5) ๊ต๋Ÿ‰ ๋†’์ด์— ๋”ฐ๋ฅธ ๋น„๋ž˜์—ผ๋ถ„ ๊ฐ์†Œ๊ฒฝํ–ฅ์„ ๋ถ„์„ํ•œ ๊ฒฐ๊ณผ, ๊ต๊ฐ ํ•˜๋‹จ๋ถ€ ๊ธฐ์ค€ ๋น„๋ž˜์—ผ๋ถ„๋Ÿ‰์œผ๋กœ 4.0 mdd ์ด์ƒ(1๊ตฌ๊ฐ„), 4.0 ~ 2.0 mdd(2๊ตฌ๊ฐ„), 2.0 ~ 1.5 mdd(3๊ตฌ๊ฐ„), 1.5 mdd ๋ฏธ๋งŒ(4๊ตฌ๊ฐ„)์˜ 4๊ตฌ๊ฐ„๋กœ ๋ถ„๋ฅ˜ํ•˜์˜€์œผ๋ฉฐ, ๊ฐ ๊ตฌ๊ฐ„๋ณ„๋กœ ๊ฐ์†Œ ๋ชจ๋ธ์„ ๋„์ถœํ•˜์˜€๋‹ค.

6) ๋ณธ ์—ฐ๊ตฌ์—์„œ ํš๋“๋œ ์ž๋ฃŒ๋Š” ํ•ด์ƒ๊ต๋Ÿ‰์˜ ๋น„๋ž˜์—ผ๋ถ„์— ์˜ํ•œ ์—ผํ•ดํ™˜๊ฒฝ์—์„œ ์ƒ๋Œ€์ ์œผ๋กœ ์•ˆ์ „ํ•œ ๊ตฌ๊ฐ„๊ณผ ์—ด์•…ํ•œ ํ™˜๊ฒฝ๊ตฌ๊ฐ„์„ ๊ตฌ๋ถ„ํ•˜์—ฌ ์—ด์•…ํ•œ ๊ณณ์— ์ง‘์ค‘์ ์ธ ์œ ์ง€๊ด€๋ฆฌ ํ™œ๋™์„ ๊ฐ€๋Šฅํ•˜๊ฒŒ ํ•  ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋˜๋ฉฐ, ๋˜ํ•œ โ€œ์‹œ์„ค๋ฌผ ์•ˆ์ „ ๋ฐ ์œ ์ง€๊ด€๋ฆฌ ์‹ค์‹œ ์„ธ๋ถ€์ง€์นจ[์„ฑ๋Šฅํ‰๊ฐ€ ํŽธ]_๊ต๋Ÿ‰ํŽธ(MOLIT, 2021)โ€์—์„œ ์—ดํ™”ํ™˜๊ฒฝ์˜ ๋‚ด๊ตฌ์„ฑ ํ‰๊ฐ€ํ•ญ๋ชฉ ์ค‘ ํ•ด์ƒ๋†’์ด์— ๋”ฐ๋ฅธ ํ™˜๊ฒฝํ‰๊ฐ€ ํ•ญ๋ชฉ์˜ ์‹ ์„ค์— ํ™œ์šฉ๋  ์ˆ˜ ์žˆ์„ ๊ฒƒ์œผ๋กœ ๊ธฐ๋Œ€ํ•œ๋‹ค.

๊ฐ์‚ฌ์˜ ๊ธ€

๋ณธ ์—ฐ๊ตฌ๋Š” ๊ณผํ•™๊ธฐ์ˆ ์ •๋ณดํ†ต์‹ ๋ถ€ ํ•œ๊ตญ๊ฑด์„ค๊ธฐ์ˆ ์—ฐ๊ตฌ์› ์—ฐ๊ตฌ์šด์˜๋น„์ง€์›(์ฃผ์š”์‚ฌ์—…)์‚ฌ์—…์œผ๋กœ ์ˆ˜ํ–‰๋˜์—ˆ์Šต๋‹ˆ๋‹ค(๊ณผ์ œ๋ฒˆํ˜ธ 20220217-001, DNA ๊ธฐ๋ฐ˜ ๋…ธํ›„ ๊ต๋Ÿ‰ ๊ตฌ์กฐ๋ฌผ ์Šค๋งˆํŠธ ์œ ์ง€๊ด€๋ฆฌ ํ”Œ๋žซํผ ๋ฐ ํ™œ์šฉ๊ธฐ์ˆ  ๊ฐœ๋ฐœ).

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