Received May 21 2013, Revised May 28 2013, Accepted May 30 2013
Copyright ⵑ 2013 by the Korean Society of Civil Engineers
ǣǣȀȀǤǤȀͳͲǤͳʹͷʹȀ ǤʹͲͳ͵Ǥ͵͵ǤͶǤͳͶͷͷ
Ǥ ǤǤ
⌾⍂#Ⳟኳ㒾ⴲ⡦ⴖ#Volw#㯓♿⮎#ἶ#⇖♪㡷⛯#⢢㮖
ଲஂ
Lee, Jong-In*
Experimental Study for Wave Reflection of Partially Perforated Caisson by Slit Shape of Front Wall
ABSTRACT
This study examines the reflection of a partially perforated wall with single chamber by 2D and 3D hydraulic experiments. The effects of slit shape on the front wall, relative chamber width and wave steepness were discussed. For the normal incident wave condition, the reflections of horizontal slit case were lower than that of the vertical slit with the similar porosity, but the differences are not significant.
When the wave steepness is relatively small, the reflection coefficients are large. In the oblique incidence, the normalized wave heights along a perforated wall with similar porosity are almost same for the vertical and horizontal slit walls and therefore the difference by slit shape can be ignored.
Key words : Hydraulic experiment, Partially perforated caisson, Slit shape, Relative chamber width, Porosity
Ⅹಾ
ᅙᩑǍᨱᕽ۵ᮁŖᇡ⩶ᔢ, ᔢݡᮁᙹᝅ⡎, ❭⩶Ğᔍ॒ᨱෙᮁŖ⍡ᯕᜉ᮹ᗭ❭✚ᖒᮥ2₉ᬱၰ3₉ᬱᝅ⨹ᮥ☖⧕Łₑ⦹ᩡ݅. ❭௲ᯕḢb ᮝಽ᯦ᔍ⦹۵Ğᬑ, ᮁᔍ⦽ᮁŖᮉ᳑Õᨱᕽ⬂slitᯕ᳦slitᨱእ⧕ၹᔍĥᙹa᧞e᯲íĥ⊂ࡹᨩᮝӹə₉ᯕ۵Ⓧḡᦫᦹ݅. əญŁ❭⩶Ğ ᔍaⓑĞᬑa᯲ᮡĞᬑᨱእ⧕᧞eԏᮡၹᔍĥᙹෝᅕᩡ݅. Ğᔍ᯦ᔍ❭᳑ÕᨱᕽࠥᮁŖᮉᯕᮁᔍ⧁Ğᬑ, ᮁŖᇡ⩶ᔢᨱෙᱽℕᱥ໕᮹
❭Ł₉ᯕ۵Ñ᮹ၽᔾ⦹ḡᦫᦹ݅.
áᔪᨕ ᙹญᝅ⨹, ᇡᇥᮁŖ⍡ᯕᜉ, ᮁŖᇡ⩶ᔢ, ᔢݡᮁᙹᝅ⡎, ᮁŖᮉ
1. ᕽು
ᖁၶ᮹ݡ⩶⪵॒ᮝಽᯙ⧕⧎อǍ᳑ྜྷ᮹ÕᖅᙹᝍᯕʫᨕḡŁᖅĥ❭Ła᷾ݡࢉᨱĞᱽᖒၰᦩᱶᖒ॒᮹⪶ᅕ⊂໕ᨱᕽ
ĞᔍǍ᳑ྜྷ ᅕ݅۵ ḢพǍ᳑ྜྷᯕ ᖁ⪙ࡹ۵ Ğ⨆ᯕ݅. ḢพǍ᳑ྜྷ ⩶ ᵲ ᮁŖᇡෝ ᖅ⊹⦽ ᮁŖ⍡ᯕᜉᮡ Ğᱽᖒ ⊂໕ᨱᕽ۵
ྕŖ⍡ᯕᜉᨱእ⧕݅ᗭᇩญ⦽⊂໕ᯕᯩḡอ, ⬉ᬊᖒ⊂໕ᨱᕽ۵ᬑᙹ⦹݅Ł⧁ᙹᯩ݅. ᕽݡ⩶⧎อǍ᳑ྜྷᯙĞᬑᨱŞᖅŝ
ᱲᦩᖅ॒ᨱᮁŖ⍡ᯕᜉ(ᮁŖ1ᝅੱ۵ᮁŖ2ᝅ)᮹ᱢᬊᯕ᷾a⦹Łᯩ۵⇵ᖙᯕ݅. ᮁŖ⍡ᯕᜉᮡⓍíᱥ໕ᄞ᮹ᔢ݉ᇡ░⦹݉ʭḡ
ᱥℕa ᮁŖᇡಽ Ǎᖒࡽ ᱥ໕ ᮁŖ⍡ᯕᜉ(fully perforated caisson)ŝ ᱶᙹ໕ᮥ ʑᵡᮝಽ ᔢ·⦹ᇡ ᯝᇡǍeᨱอ ᮁŖᇡෝ ᖅ⊹⦹۵
ᇡᇥᮁŖ⍡ᯕᜉ(partially perforated caisson)ᮝಽǍᇥ⧁ᙹᯩᮝ໑, ᝅᱽᖅĥ · Õᖅᨱ۵ᦩᱶᖒၰĞᱽᖒ⊂໕॒ᨱᕽᮁญ⦽
ᇡᇥᮁŖ⍡ᯕᜉᯕݡᇡᇥᱢᬊࡹŁᯩ۵ᝅᱶᯕ݅. ᮁŖ⍡ᯕᜉႊ❭ᱽ᮹ᰆᱱᵲ᮹⦹ӹಽ۵Ḣพ⩶┽᮹݉໕ᯕ໕ᕽᮁŖᇡᨱ᮹⦽
ᗭ❭⬉ŝಽᯙ⧕ᔢݡᱢᮝಽԏᮡၹᔍĥᙹෝᅕᯙ݅۵äᯕ໑, ᯕ۵❭௲ᯕᮁŖᇡෝ☖ŝ⦹໕ᕽၽᔾ⦹۵ᙹࢱᗱᝅŝᮁᙹᝅԕᨱᕽ᮹
३؋ф२χėॡ
⇵aᱢᯙᨱթḡqᙁ॒ᨱʑᯙ⦽݅. ԏᮡၹᔍᮉᮡǍ᳑ྜྷᱥ໕ᇡ ᮹❭Łෝᱡq┕ᮝಽᯙ⧕ᖁၶ᮹⧎⧪ၰᱲᦩ, ᖁ݉ᇡ᮹ᦩᱶᖒ
⪶ᅕ⊂໕॒ᨱᕽᮁญ⦹݅⧁ᙹᯩ݅. ʑ᳕ᩑǍᨱ᮹⦹໕ᮁŖ⍡ᯕ ᜉᨱ᯲ᬊ⦹۵❭ಆၰၹᔍᮉ॒ᨱᩢ⨆ᮥၙ⊹۵ᗭಽ۵ᮁŖᮉ,
ᮁᙹᝅᙹ, ᮁᙹᝅ⡎, ᮁŖᄞ᮹ࢱ̹, ݡᔢᙹᝍ, ❭௲ᱽᬱ॒ᯕ໑, ᖅĥᨱ۵᳑₉, slit ᔢ · ⦹݉Ł, ᮁŖᇡ⩶ᔢ॒ᮥ⇵aಽŁಅ⦹
í ࡽ݅.
ᮁŖႊ❭ᱽ۵Jarlan(1961)ᨱ᮹⧕ᮭᱽᦩࡹᨩᮝ໑, Jarlan
⩶ႊ❭ᱽ۵ᮁŖ⩶ᱥ໕ᄞŝྕŖ⩶⬥໕ᄞᮝಽǍᖒࡽ݅. Jarlan ᨱ᮹⧕ᱽᦩࡽᮁŖႊ❭ᱽ۵࠺ᩎ⦺ᱢ⬉ᮉ⨆ᔢ, ᦩᱶᖒ⪶ᅕ
ၰ ⍡ᯕᜉ ᱡ໕ᇡ᮹ ᖙǕ ᱡq ॒ᮥ ༊ᱢᮝಽ ݅᧲⦽ ᩑǍa
ḥ⧪ࡹᨕ᪵݅. Fugazza and Natale(1992)ᮡ݅ᵲᮁᙹᝅ᮹ᮁŖ
⍡ᯕᜉႊ❭ᱽᨱݡ⦽ၹᔍᮉᔑᱶᮥᮁࠥ⦹Ł, Ƚ⊺❭ෝᱢᬊ
⦹ᩍᔢݡᮁᙹᝅ⡎(relative chamber width)ᯕ0.25ᯙ᳑Õᨱᕽ
↽ᗭၹᔍᮉᯕӹ┡ԉᮥᅕᩡ݅. Suh and Park(1995)ᮡGalerkin Łᮁ⧉ᙹჶᮥ ᯕᬊ⦹ᩍ ᔍᕾ ษᬕऽ ᭥ᨱ ᭥⊹⦽ ᮁŖ⍡ᯕᜉ
ႊ❭ᱽᨱᯝᱶbࠥಽ᯦ᔍ⦹۵❭ᨱݡ⦽ၹᔍ✚ᖒᮥᩑǍ⦹ᩡᮝ ໑, ⧕ᕾđŝ۵ᙹญ༉⩶ᝅ⨹đŝ᪡እƱ⦹ᩡ݅. Williams et al.(2000)ᮡᮁŖ1ᝅŝᮁŖ2ᝅ, ᱥ໕ᄞᯕᮁŖ⩶ੱ۵slit⩶ᯙ
ᮁŖ⍡ᯕᜉႊ❭ᱽᨱݡ⦽eఖ⧕ᕾ⧕ෝᖁ⩶❭ᯕುᮥᯕᬊ⦹ᩍ
ᮁࠥ⦹ᩡ݅. ǎԕᩑǍಽᕽ⠙᳦ɝ(1980)ᮡᔝᵲᮁŖᄞ⍡ᯕᜉ
ႊ❭ᱽ᪡Jarlan⩶ᨱݡ⦹ᩍbb᮹ᮁŖᄞᨱ᯲ᬊ⦹۵❭ಆᨱ
ݡ⦽ ᝅ⨹ᮥ ᙹ⧪⦹ᩡᮝ໑, ❭ಆ᮹ Ⓧʑ۵ ᵝʑᅕ݅۵ ❭Ł᮹
ᩢ⨆ᮥฯᯕၼŁ, ᮁŖeᄞᅕ݅۵ᱥ໕ᄞŝ⬥໕ᄞᨱᕽ❭ಆᯕ
Ⓧí᯲ᬊ⧉ᮥᅕᩡ݅. ੱ⦽ᱥ໕ᄞ᮹ᮁŖᮉᯕ᯲Ł, ᯦ᔍ❭᮹
❭⩶Ğᔍa⍅ḩᙹಾᱥ໕ᄞᨱ᯲ᬊ⦹۵❭ಆ᮹Ⓧʑa᷾a⧉ᮥ
ၾ⩵݅.
ᮁŖ⍡ᯕᜉ᮹ᗭ❭✚ᖒᨱš⦽ʑ᳕ᩑǍॅᮡᮁŖᇡᨱ᮹⦽
ᨱթḡqᙁ, ᱢᱶᮁŖᮉၰᮁᙹᝅ⡎᮹đᱶᨱǍࡹ۵ᯱഭ᮹
ࠥ⇽ᨱᵲᱱᮥࢱᨩ݅. ᇩȽ⊺❭ෝᱢᬊ⦽ʑ᳕ᩑǍॅᨱ᮹⦹໕
ᮁŖ1ᝅᯙĞᬑᨱᱢᱶᮁŖᮉ(porosity)ᮡ᧞30%ᯕŁ, ᔢݡᮁ
ᙹᝅ⡎ᮡ0.1~0.15aᱢᱶ⦽äᮝಽá☁ࡹᨩ݅. ᇡᇥᮁŖ⍡ᯕ ᜉ᮹ĞᬑᨱǍ᳑ྜྷᔢᇡ۵ᔢ⊹⎹Ⓧญ✙ᖅ⊹॒ᮝಽᯙ⧕ᮁŖ ᇡ ᔢ݉᮹ ׳ᯕ۵ ᱽ⦽ᯕ ࡹʑ ভྙᨱ ᩑǍ ॒ᮥ ☖⧕ ᱢᱶ
ᔢ݉Łෝᱽ⦹ࠥᝅྕᨱᱢᬊ⦹۵ߑᯩᨕᕽ۵ᱽ᧞ᯕෝ
ᙹ ᯩ݅. ᱽ᧞ᯕᔢݡᱢᮝಽ ԏᮡ ᱢᱶᮁŖᇡ ⦹݉Łᨱ ݡ⦽
ᩑǍࠥ ၙḥ⦽ ᝅᱶᯕ໑, ᯕᨱ ݡ⦽ ǎԕ ᩑǍಽᕽ Kim and Lee(2013)ෝॅᙹᯩ݅. Kim and Lee᮹ᩑǍᨱᕽ۵ᙹญᝅ⨹ᮥ
☖⧕ᇡᇥᮁŖǍ᳑ྜྷ᮹⦹݉Ł۵᯦ᔍ❭Ł᮹2~3႑aᱢᱶ⧉ᮥ
ᅕᩡ݅.
ᱥᚁ⦽ʑ᳕ᩑǍ᮹ݡᇡᇥᮡ❭௲ᯕǍ᳑ྜྷᨱḢbᮝಽ᯦ᔍ⦹
۵᳑ÕᨱᕽᮁŖ⍡ᯕᜉ᮹ᙹญ⦺ᱢ✚ᖒᮥ᭥ᵝಽá☁⦽äᯕ໑,
Ğᔍ᯦ᔍ❭ᨱݡ⦽ᮁŖ⍡ᯕᜉ᮹ᗭ❭✚ᖒᨱݡ⦽ᩑǍ۵ᔢݡᱢ ᮝಽ ၙၙ⦽ ᝅᱶᯕ݅. Li et al.(2003)ᮡ 2ᵲ ᮁᙹᝅ ᳑Õᨱᕽ
᯦ᔍbᨱෙၹᔍĥᙹෝeigenfunction expansion methodෝ
ᯕᬊ⦹ᩍá☁⦹ᩡᮝ໑, Liu et al.(2007)ᮡᖁ⩶⡍▱ᖽᯕು(linear potential theory)ᮥᯕᬊ⦹ᩍᮁŖ⍡ᯕᜉᨱ❭௲ᯕĞᔍḡí᯦ᔍ
⦹۵ Ğᬑᨱ ݡ⦽ ᮁᙹᝅ ԕᇡ᪡ ᇡ᮹ ❭Łᇥ⡍ෝ Ƚ⊺❭ෝ
ᱢᬊ⦹ᩍ á☁⦹ᩡᮝӹ, ᙹญᝅ⨹đŝ ॒ŝ᮹ እƱ۵ ᙹ⧪⦹ḡ
ᦫᦹ݅. Liu et al.(2009)ᮡĞᔍ᯦ᔍ❭ᨱݡ⦽ᮁŖ⍡ᯕᜉ᮹ၹᔍ ĥᙹෝȽ⊺❭ෝᱢᬊ⦹ᩍ⧕ᕾ⦹ᩡᮝ໑, ᯦ᔍbᯕ᷾a(Ḣb᯦ᔍ ᮹ Ğᬑᨱ 0°)⧁ᙹಾ ၹᔍĥᙹa ᷾a⧉ᮥ ᅕᩡ݅.
ᮁŖ⍡ᯕᜉ᮹ ᗭ❭✚ᖒᨱݡ⦽݅᧲⦽ᩑǍaᙹ⧪ࡹᨩḡอ,
ᮁŖᇡ᮹⩶ᔢᨱෙá☁۵ᔢݡᱢᮝಽၙ⯂⦽ᝅᱶᯕ݅. ᕽ
ᅙᩑǍᨱᕽ۵ᮁŖᇡ᮹⩶ᔢ(᳦slitŝ⬂slit)ᨱෙၹᔍ✚ᖒᮥ
Ḣb᯦ᔍ❭ၰĞᔍ᯦ᔍ❭ෝݡᔢᮝಽᝅ⨹ᱢᮝಽá☁⦹ᩡ݅.
Ḣb᯦ᔍ❭᳑Õᨱᕽ۵bᮁŖᇡ⩶ᔢᄥಽ3}᮹ᮁŖᮉᮥᱢᬊ⦹
ᩍᮁŖᮉ, ᮁŖᇡ⩶ᔢၰ❭⩶Ğᔍᨱෙၹᔍ✚ᖒᮥá☁⦹ᩡ݅.
əญŁĞᔍ᯦ᔍ❭᳑ÕᨱᕽྕŖ⍡ᯕᜉŝᮁŖ⍡ᯕᜉᮥݡᔢᮝ ಽ ᯦ᔍb, ᮁŖᇡ᮹ ⩶ᔢ, ᔢݡᮁᙹᝅ ⡎ᨱ ෙ ᱽℕ ᱥ໕᮹
❭Łᇥ⡍ෝ እƱ á☁⦹ᩡ݅.
2. ᙹญᝅ⨹
2.1 ਓਏডࢫਓୋण
ᅙᩑǍᨱᕽ۵ᇡᇥᮁŖ⍡ᯕᜉ᮹ᮁŖᇡ⩶ᔢ, ᮁŖᮉŝᔢݡᮁ
ᙹᝅ⡎ᨱෙၹᔍ✚ᖒᮥá☁⦹ʑ᭥⧕2₉ᬱᝅ⨹ᮥᙹ⧪⦹ᩡ
݅. 2₉ᬱᝅ⨹ᮡFig. 1(a)ᨱࠥࡽᙹಽෝᯕᬊ⦹ᩡᮝ໑, ᝅ⨹ᙹ ಽ۵ʙᯕ56m, ׳ᯕ2m, ⡎1mᯕŁ, ᱥʑᕽᅕ⦝ᜅ★᳑❭ʑa
ᖅ⊹ࡹᨕᯩ݅. ᅙᝅ⨹ᙹಽ۵Ƚ⊺❭ၰᇩȽ⊺❭ෝ᳑❭⧁ᙹ
ᯩᮝ໑, ᙹಽ ԕᨱᕽ Ǎ᳑ྜྷ ᖅ⊹ಽ ᯙ⦽ ၹᔍ❭᪡ ᳑❭❱ᨱᕽ
ၽᔾ⦹۵ ᰍၹᔍ❭ෝ⬉ŝᱢᮝಽ ᱽᨕ⦹ʑ ᭥⧕ ᙹಽ ⡎ 1mෝ
⡎0.6m᪡⡎0.4mಽᇥ⧁⦹ᩡ݅. ᇥ⧁ࡽᙹಽᨱᕽᝅ⨹༉⩶ᮡ
⡎ 0.6m᮹ᙹಽᨱ ᖅ⊹⦹ᩍ ᱽၹ ᯱഭෝ ≉ा⦹Ł, ⡎0.4m᮹
ᙹಽᨱᕽ۵ ᯦ᔍ❭᮹ ᖅᱶ ၰ ᅕᱶᮥ ᙹ⧪⦹ᩡ݅.
ੱ⦽Ğᔍ᯦ᔍ❭ᨱ᮹⦽ᇡᇥᮁŖ⍡ᯕᜉ᮹ၹᔍ✚ᖒᮥá☁⦹
ʑ᭥⧕3₉ᬱᝅ⨹ᮥᙹ⧪⦹ᩡ݅. 3₉ᬱᝅ⨹ᨱᔍᬊࡽ᳑❭ʑ۵
݅ႊ⨆ᇩȽ⊺❭᳑❭ʑಽᕽȽ⊺❭, ᯝႊ⨆ᇩȽ⊺❭ၰ݅ႊ⨆
ᇩȽ⊺❭᮹᳑❭aa܆⦽ᔍ⩶(snake-type) ᳑❭ʑᯕ݅. ᳑❭ʑ
bǍ࠺ᇡᨱᩑđࡽ᳑❭❱⦹ӹ᮹⡎ᮡ0.5 m, ׳ᯕ۵1.1mಽᕽ
᳑❭ʑ᮹ ᱥℕ ⡎ᮡ 30mᯕŁ, ᱥʑᕽᅕ ⦝ᜅ★ᯕ݅. ᝅ⨹ᨱ
ᔍᬊࡽ ⠪໕ᙹ᳑۵ ʙᯕ 42m, ⡎ 36m, ׳ᯕ 1.05mᯕ݅. Fig.
1(b)۵ᅙᝅ⨹ᨱᔍᬊࡽ⠪໕ᙹ᳑᪡༉⩶ᖅ⊹}ֱࠥෝࠥ⦽
äᯕ݅.
(a) wave flume for 2D test
(b) wave basin for 3D test Fig. 1. Experimental facilities and setup
(a) side view (b) top view
(c) front view of partially perforated wall with vertical-type slit
(d) front view of partially perforated wall with horizontal-type slit Fig. 2. Schematic diagram of model structure
Table 1. Dimensions of model structures (unit : cm)
hb hc S t CW CL Remarks
64.4 12.0 22.0 1.6 20.6 19.2 2D test
40.3 7.5 13.7 1.0 12.9 12.0 3D test
əญŁᅙᝅ⨹ᨱᔍᬊࡽᇥᕾᰆእ۵⍕⥉░, ᷾⡎ʑၰA/D converter ॒ᮝಽǍᖒࡹᨕᯩᮝ໑, ᝅ⨹❭ᱽᬱᨱᔾᖒࡽ
᳑❭ᝁ⪙ෝ᳑❭ʑಽᘂᝁ⦹Ł, ❭Łĥಽᇡ░ࠦ≉ࡽᯱഭෝᵝ❭
ᙹᜅ⟺✙ౝၰ❭Ł॒ᮝಽᇥᕾ⦹۵ʑ܆ᮥ⦹۵ᰆ⊹ᯕ݅. ᝅ⨹❭
ᖅᱶၰ❭Łĥ⊂ᨱᔍᬊࡽ❭Łĥ۵ᬊప❭Łĥಽᕽʙᯕ۵
0.6mᯕŁ, ⊂ᱶჵ᭥۵ 0~±0.3mᯕ໑, ࠦ≉ᮉᮡ 20Hzᯕ݅.
2.2 ਓࡦ෴
ᮁᙹᝅᯕ 1}ᯙ ᮁŖ⍡ᯕᜉᮥ ݡᔢᮝಽ ᱥ໕ᄞ᮹ slit ⩶ᔢ,
ᮁŖᮉ(P) ၰᔢݡᮁᙹᝅ⡎ᨱෙၹᔍ✚ᖒᮥᝅ⨹ᱢᮝಽá☁⦹
ᩡ݅. ᝅ⨹ᨱᔍᬊࡽ༉⩶Ǎ᳑ྜྷ᮹⩶ᔢᮥࠥ⦽äᯕFig. 2ᯕ݅.
Fig. 2(a, b)۵ bb ⊂໕ࠥ᪡ ⠪໕ࠥಽᕽ ༉⩶᮹ ᵝ ᱽᬱᮡ
Table 1ᨱᱽࡹᨕ ᯩ݅. ᅙᝅ⨹ᨱᕽ۵ᔍᬊࡹ۵ᝅ⨹ᖅ᮹
ᱽᬱᮥqᦩ⦹ᩍ2₉ᬱŝ3₉ᬱᝅ⨹ᨱᔍᬊࡽ༉⩶ᮥᕽಽ݅ෙ
⇶ᮥᱢᬊ⦹ᩍᱽ᯲⦹ᩡ݅. ᷪ, ᝅ⨹đŝ᮹ᝁᖒ⨆ᔢᮥ᭥⧕
2₉ᬱ ༉⩶ᮡ 3₉ᬱ ༉⩶ᨱ እ⧕ ᅕ݅ Ⓧí ᱽ᯲⦹ᩡ݅(Table 1 ₙ᳑). Fig. 2ᨱᕽhb۵Ǎ᳑ྜྷ⦹݉ᮝಽᇡ░slit ⦹݉ʭḡ᮹
׳ᯕ, hc۵slit ᔢ݉ᮝಽᇡ░Ǎ᳑ྜྷษʭḡ᮹׳ᯕ, S۵ᮁŖᇡ (slit)᮹ ʙᯕ, t۵ ᄞ᮹ ࢱ̹, CW۵ ᮁᙹᝅ ⡎, CLᮡ ᮁᙹᝅ᮹
ʙᯕᯕ݅. əญŁᮁŖᇡ᮹ʙᯕS۵SU᪡SLಽǍᇥ⦹ᩡ݅. SU۵
Table 2. Dimensions of partially perforated wall (unit : cm)
Case ID
vertical-type slit
porosity, P (%)
2D test 3D test
b1 b2 b3 b4 b1 b2 b3 b4
VP20 2.2 3.6 1.0 4.4 - - - - 20.8
VP30 2.0 3.2 1.4 4.0 1.25 2.0 0.88 2.5 29.2
VP40 2.0 2.4 2.0 4.0 - - - - 41.7
Case ID
Horizontal-type slit
porosity, P (%)
2D test 3D test
c1 c2 c3 c4 c5 c1 c2 c3 c4 c5
HP20 2.4 4.0 1.2 4.8 14.4 - - - 20.5
HP30 3.2 3.0 2.0 6.4 12.8 2.0 1.88 1.25 4.0 8.0 30.3
HP40 3.4 2.0 2.8 6.8 12.4 - - - 41.1
ᱶᙹ໕ᮝಽᇡ░slit ᔢ݉ʭḡ, SLᮡᱶᙹ໕ᮝಽᇡ░slit ⦹݉ʭḡ ᮹ ʙᯕᯕ݅. Fig. 2(c, d)۵ ᱥ໕ᄞ᮹ ⩶ᔢᮝಽᕽ bb ᳦
slit(vertical-type slit)ŝ⬂slit(horizontal-type slit) ༉⩶ᮥࠥ
⦽äᯕ݅. ᅙᝅ⨹ᨱᱢᬊࡽᮁŖᇡ⩶ᔢၰᮁŖᮉᨱෙᮁŖᇡ
ᱽᬱᮡTable 2ᨱᱶญ⦹ᩡ݅. ᮁŖᮉᮡFig. 2(c, d)ᨱࠥࡽ
ၵ᪡ zᯕᮁŖᇡ ⦹݉ŝ ᔢ݉ᔍᯕ᮹ ᱥℕ ໕ᱢŝᮁŖᇡอ᮹
໕ᱢ᮹እಽᔑᱶ⦹ᩡ݅. ᳦slit᮹Ğᬑᨱ۵ᱶᙹ໕ᨱᱲ⦹۵ᇡᇥ ᨱ ݡ⧕ ᮁŖᮉᮥ ᔑᱶ⦹ᩍࠥ ࡹḡอ, ⬂ slit᮹ Ğᬑᨱ۵ ᯕෝ
ᱢᬊ⧁ᙹᨧʑভྙᯕ݅. ᱥᚁ⦽ၵ᪡zᯕᝅ⨹ᖅ॒᮹ᱽ᧞ᮝಽ
ᯙ⧕2₉ᬱᝅ⨹ŝ3₉ᬱᝅ⨹࠺ᯝ⦽༉⩶ᮥᔍᬊ⧁ᙹᨧᨕ
ᬱ⩶ᮥ ᕽಽ ݅ෙ ⇶ᮥ ᱢᬊ⦹ᩍ ᝅ⨹༉⩶ᮥ ᱽ᯲⦹ᩡ݅.
2.3 ਓՍ
Ḣb᯦ᔍ᳑ÕᨱᕽᮁŖᇡ᮹⩶ᔢᨱෙၹᔍ✚ᖒᮥá☁⦹ʑ
᭥⧕ ᱥ໕ᄞᯕ ᳦ slitŝ ⬂ slitᯙ ᮁŖ 1ᝅ ⍡ᯕᜉᮥ ݡᔢᮝಽ
⦹ᩡᮝ໑, bb᮹ slit ⩶ᔢᄥಽ 3aḡ᮹ ᮁŖᮉᮥ ᱢᬊ⦹ᩡ݅.
᳦ slit᮹ Ğᬑᨱ P=20.8%(case VP20), 29.2%(case VP30), 41.7%(case VP40), ⬂ slitᯙ Ğᬑᨱ P=20.5%(case HP20),
30.3%(case HP30), 41.1% (case HP40)ᯕ݅. ᅙᝅ⨹ᨱᱢᬊࡽ
ᮁŖᇡ᮹ᱽᬱᮡTable 2ᨱᱽࡹᨕᯩᮝ໑, slit ⩶ᔢᄥಽa܆⦽
⦽ᮁᔍ⦽ᮁŖᮉᯕࡹࠥಾ༉⩶ᮥᱽ᯲⦹ᩡᮝӹ, ᧞e᮹ᮁŖᮉ
₉ᯕ۵ ᳕ᰍ⦽݅.
Ğᔍ ᯦ᔍ❭᳑Õᨱᕽ ❭௲ŝ ᮁŖ⍡ᯕᜉ᮹ ᔢ⪙᯲ᬊᨱ ᮹⦽
❭Łᱡq⬉ŝෝá☁⦹ʑ᭥⧕3₉ᬱᝅ⨹ᮥᙹ⧪⦹ᩡᮝ໑, 3₉ᬱ
ᝅ⨹ᮡ ༉⩶ᱽ᯲Ğእ ॒᮹ ᱽ᧞ᮝಽ ᯙ⧕ bb᮹ slit ⩶ᔢᄥಽ
1}᮹ ᮁŖᮉอᮥ ݡᔢᮝಽ ⦹ᩡ݅. ᅙ ᩑǍᨱᕽ۵ ྕŖǍ᳑ྜྷ
(case PW), ᳦slit(case VP30)ŝ⬂slit(case HP30) ᝅ⨹ᦩᮥ
ݡᔢᮝಽ⦹ᩡ݅. 3₉ᬱᝅ⨹ᨱᱢᬊࡽ༉⩶᮹ᩑᰆᮡ༉⩶ᔢ20m ᯕ໑, ༉⩶᮹႑⊹۵Fig. 1(b)ෝₙ᳑⧁ᙹᯩ݅. ᝅ⨹᯦ᔍ❭᪡
Ǎ᳑ྜྷᯕᯕ۵b(ⱖ)ᮡ༉⩶᮹ᖅ⊹bࠥෝᄡĞ⦹ᩍ᳑ᱩ⦹ᩡ݅.
ᯕ۵ 3₉ᬱ ᝅ⨹ᨱ ᔍᬊࡽ ᳑❭ʑa ݅ႊ⨆᳑❭ʑᯕʑ ভྙᨱ
Ğᔍ᯦ᔍ❭ෝᰍ⩥⧁ᙹᯩᮝӹ, Ğᔍ᯦ᔍ❭ಽᰍ⩥⧁Ğᬑᨱ
bb᮹᯦ᔍbᄥಽ࠺ᯝ⦽᳑Õ᮹❭௲ᮥᖅᱶ⦹ʑᨕಖŁ, ੱ⦽
᯦ᔍbᯕ⍅ḡíࡹ໕⫭ᱩᯕၽᔾ⦹íࡹᨕᝅ⨹đŝ᮹ᱶ⪶ࠥᨱ
ᩢ⨆ᮥၙ⋁ᙹᯩʑভྙᯕ݅. Fig. 3~Fig. 5۵ᝅ⨹ᦩᄥ༉⩶ᖅ⊹
ᰆ໕ᯕ݅.
Table 3. Wave conditions in experiment Significant wave
period, TS (s)
Significant wave height, (HS)O (cm)
Water depth,
hO (cm) Remarks 0.8 ~ 2.6 (쨣TS = 0.2) 2, 4 74.4 2D test 0.79, 1.11, 1.42, 1.74 2.5 46.5 3D test
(a) cases VP20 & HP20
(b) cases VP30 & HP30
(c) cases VP40 & HP40
Fig. 6. Reflection coefficients by porosity and slit shapes of front ᝅ⨹❭۵bᝅ⨹ᄥ(2₉ᬱၰ3₉ᬱᝅ⨹)ಽǍᇥ⦹ᩍᱢᬊ⦹ᩡ
݅(Table 3 ₙ᳑). 2₉ᬱᝅ⨹ᮡᱥ໕ᄞ᮹ᮁŖᇡ⩶ᔢ, ᮁŖᮉ
ၰᔢݡᮁᙹᝅ⡎॒ᨱෙᗭ❭✚ᖒᮥ⠪a⦹۵äᯕᵝࡽ༊ᱢᯕ ʑভྙᨱ᯦ᔍ❭᮹ᵝʑෝ݅᧲⦹íᱢᬊ⦹ᩡ݅. ᱢᬊࡽ᯦ᔍ❭᮹
ᮁ᮹ᵝʑ(TS)۵ TS=0.8s~2.6sᯕ໑, ᵝʑ eĊ(ⱀTS)ᮡ ⱀTS=0.2 sᯕ݅. əญŁǍ᳑ྜྷᯕᖅ⊹ࡹʑᱥǍ᳑ྜྷᖅ⊹᭥⊹ᨱᕽ᮹ᮁ᮹❭
Ł((HS)O)۵(HS)O=2cm᪡4cmᯕ໑, Ǎ᳑ྜྷᖅ⊹᭥⊹ᨱᕽ᮹ᙹᝍ (hO)ᮡhO=74.4cmᯕ݅. hO=74.4cmᯙĞᬑ, ᱶᙹ໕ᮝಽᇡ░slit ᔢ݉ʭḡ᮹׳ᯕ(SU)᪡slit ⦹݉ʭḡ᮹׳ᯕ(SL)۵bbSU=12cm, SL=10cmᯕ݅. ᷪ, (HS)O=2cmᯙĞᬑᨱSU/(HS)O=6ŝSL/(HS)O
=5ᯕ໑, (HS)O=4cmᯙĞᬑᨱ۵SU/(HS)O=3ŝSL/(HS)O=2.5ᯕ
݅. 3₉ᬱᝅ⨹᮹Ğᬑᨱ᯦ᔍ❭᮹ᮁ᮹ᵝʑ۵TS=0.79s, 1.11s, 1.42s ၰ1.74sᯕ໑, ᮁ᮹❭Ł۵(HS)O=2.5cmᯕ໑, ᱢᬊᙹᝍᮡ
hO=46.5cmᯕ݅. hO=46.5cmᯙĞᬑᨱSU=7.5cm, SLⴉ6.2cmᯕ အಽ(HS)O=2.5cm ᳑ÕᨱᕽSU/(HS)O=3.0ŝSL/(HS)O=2.5ᯕ݅.
əญŁ᯦ᔍ❭᪡Ǎ᳑ྜྷᯕᯕ۵b(ⱖ)ᮡⱖ=10°, 20° ၰ30°ෝ
ᱢᬊ⦹ᩡ݅.
ᅙᩑǍᨱᕽᱽࡽᮁŖ⍡ᯕᜉၰ❭௲᮹ᱽᬱ॒(Table 1, Table 2 ၰ Table 3)ᮡ ༉⩶ᔢ᮹ sᮝಽᕽ 2₉ᬱ ᝅ⨹᮹ Ğᬑ
1/25, 3₉ᬱᝅ⨹᮹Ğᬑ1/40 ⇶ᮥᱢᬊ⦹ᩍᬱ⩶ᮥ⇶ᗭ⦹ᩡᮝ ໑, ⇶ᮥ ᱢᬊ⦹໕ ᬱ⩶sᮝಽ ⪹ᔑ⧁ ᙹ ᯩ݅.
༉ुᝅ⨹ᨱᱢᬊࡽᯝႊ⨆ᇩȽ⊺❭۵Bretschneider-Mitsuyasu ᵝ❭ᙹ ᜅ⟺✙ౝᮥ ᱢᬊ⦹ᩍ ᰍ⩥⦹ᩡᮝ໑, ᯦ᔍ❭۵ Ǎ᳑ྜྷᯕ
ᖅ⊹ࡹʑᱥ᮹᳑Õ, ᷪ☖ŝ❭šᱱᨱᕽᖅᱶ⦹ᩡ݅. 2₉ᬱᝅ⨹ᨱ ᕽ۵༉⩶Ǎ᳑ྜྷᯕᖅ⊹ࡹḡᦫ۵⩲ᙹಽᨱᕽǍ᳑ྜྷᖅ⊹᭥⊹, 3₉ᬱᝅ⨹ᨱᕽ۵Fig. 1(b)ᨱࠥࡽʑᵡᱱ(reference point)ᨱᕽ
᯦ᔍ❭ෝᔢĥ⊂⦹ᩍŝࠥ⦽ၹᔍ❭᮹ၽᔾᮁྕෝ⪶ᯙ⦹ᩡ݅.
əญŁǍ᳑ྜྷ॒ᨱ᮹⧕ၽᔾࡹ۵ၹᔍ❭aĥ⊂ᩢᩎԕಽᱥ❭ࡹ
۵äᮥ↽ᗭ⪵⦹ʑ᭥⧕݅᧲⦽ᗭ❭ᖅᮥ∊ᇥ⯩႑⊹⦹ᩡ݅.
3. ᝅ⨹đŝᇥᕾၰŁₑ
ᅙᩑǍᨱᕽ۵ᇡᇥᮁŖ⍡ᯕᜉ᮹ᮁŖᇡ⩶ᔢᨱෙᗭ❭✚ᖒ
ᮥ á☁⦹ʑ ᭥⧕ 2₉ᬱ ၰ 3₉ᬱ ᝅ⨹ᮥ ᙹ⧪⦹ᩡ݅. ❭௲ᯕ
Ǎ᳑ྜྷᨱḢbᮝಽ᯦ᔍ⦹۵2₉ᬱᝅ⨹ᨱᕽ۵ၹᔍĥᙹࠥ⇽ᮥ
☖⦽ᮁŖᇡ⩶ᔢၰᮁŖᮉᨱෙᗭ❭✚ᖒᮥ᭥ᵝಽá☁⦹ᩡŁ,
3₉ᬱᝅ⨹ᨱᕽ۵Ğᔍ᯦ᔍ❭ᨱݡ⦽ᇡᇥᮁŖ⍡ᯕᜉ᮹ᗭ❭✚ᖒ
ᮥ ᱽℕ ᱥ໕᮹ ❭Łᇥ⡍ෝ ĥ⊂⦹ᩍ á☁⦹ᩡ݅.
3.1 କվಧଲਈଭࢱॷন
ᱥ໕ᄞ᮹ᮁŖᇡ⩶ᔢ, ᮁŖᮉၰᔢݡᮁᙹᝅ⡎ᨱෙᇡᇥ
ᮁŖ⍡ᯕᜉ᮹ ၹᔍ✚ᖒᮥ 2₉ᬱ ᝅ⨹ᮥ ☖⧕ á☁⦹ᩡ݅.
Fig. 6ᮡ SU=12cm᪡ SL=10cm ᳑Õᨱᕽ ᮁŖᮉ ၰ ᮁŖᇡ
⩶ᔢᨱෙၹᔍĥᙹᝅ⨹đŝಽᕽᔢݡᮁᙹᝅ⡎(CW/LS)ᨱݡ⧕
ࠥ⦹ᩡ݅. ᩍʑᕽ, LS۵᯦ᔍ❭᮹ᮁ᮹ᵝʑᨱݡ᮲⦹۵❭ᰆᯕ݅.
ᅙ ᝅ⨹᳑Õ ԕᨱᕽ ↽ᗭ ၹᔍĥᙹ۵ ʑ᳕ ᩑǍđŝ᪡ ᮁᔍ⦽
(a)쩁=10°
(b)쩁=20°
(c) 쩁=30°
Fig. 7. Normalized wave height along a wall (x-dir.) by front wall
(a)쩁=10°
(b)쩁=20°
(c) 쩁=30°
Fig. 8. Normalized wave height along a wall (x-dir.) by front wall CW/LS=0.1~0.15 ჵ᭥ᨱᕽĥ⊂ࡹᨩᮝ໑, ᮁŖᮉᨱෙ↽ᗭၹᔍ
ĥᙹၽᔾ᭥⊹᮹ᄡ⪵۵Ñ᮹ӹ┡ӹḡᦫᦹ݅. ᱥℕᱢᮝಽCW/LS ⴍ0.1ᯙĞᬑᨱ⬂slit(HP series)᮹ၹᔍĥᙹa᳦slit(VP series) ᮹đŝᅕ݅᧞e᯲íĥ⊂ࢉᮥᙹᯩ݅. əญŁᱥၹᱢᮝಽ
᯦ᔍ❭᮹❭ŁaⓑĞᬑa᯲ᮡĞᬑᨱእ⧕ၹᔍĥᙹa᯲ᮭᮥ
ᙹᯩ݅. ᯕ۵᯦ᔍ❭᮹❭⩶ĞᔍaⓑĞᬑa᯲ᮡĞᬑᨱእ⧕
ᨱթḡqᙁa Ⓧʑ ভྙᨱ ၹᔍĥᙹa ԏí ӹ┡ӹ۵ äᯕ݅.
(HS)O=4cm ᳑Õᨱᕽ┡ᮁŖᮉᨱእ⧕VP40 ၰHP40᮹Ğᬑa
slit ⩶ᔢᨱෙၹᔍĥᙹ᮹₉ᯕaⓍíӹ┡ԍᮝ໑, HP40᮹Ğᬑ aVP40᮹Ğᬑᨱእ⧕15~20% ᱶࠥၹᔍĥᙹaԏíĥ⊂ࡹᨩ݅.
CW/LSⴌ0.05ᯙĞᬑ۵ᮁŖᮉᨱෙၹᔍĥᙹ᮹₉ᯕ۵Ⓧḡᦫᦹ ᮝӹ, CW/LSⴍ0.05ᯙ᳑Õᨱᕽ۵ᅙᩑǍᨱᕽᙹ⧪⦽ᝅ⨹ᦩᵲ
Pⴉ30%᮹ᗭ❭⬉ŝaaᰆᬑᙹ⦹íӹ┡ԍ݅. ᅙᝅ⨹ᨱᱢᬊࡽ
slit᮹ᔢ · ⦹݉Ł۵ᱶᙹ໕ᮝಽᇡ░SU=12cm᪡SL=10cm ᳑Õᯕ Ł᯦ᔍ❭᮹ᮁ᮹❭Ła(HS)O=2cm᪡4cmᯕʑভྙᨱᮁŖᇡᔢ·⦹
݉ᨱ᭥⊹⦹۵ྕŖᇡᨱ❭௲ᯕḢᱲᱢᮝಽᇡঋ⊹ḡᦫ۵᳑Õᯕ݅.
ᕽ ᮁᙹᝅ ԕᨱᕽ᮹ Ŗʑ⡍⫮ᮡ ၽᔾ⦹ḡ ᦫ۵݅.
3.2 լॷॷ൞Սছକվಧଲਈଭࢱॷন
Fig. 7~Fig. 10ᮡ ⱖ=10°, 20°, 30°ᯙ Ğᔍ ᯦ᔍ❭᳑Õᨱᕽ
Ǎ᳑ྜྷᱥ໕ᮥෙᔢݡ❭ŁෝḢพྕŖ⍡ᯕᜉ, ᳦slit ၰ⬂
slit ᮁŖ⍡ᯕᜉᮥݡᔢᮝಽእƱࠥ⦽äᯕ݅. Ğᔍ᯦ᔍ❭ෝ
ݡᔢᮝಽ⦽ᝅ⨹ᨱᕽ۵ᮁŖᮉᯕ᧞30%ᯙVP30ŝHP30 ᝅ⨹ᦩ
ᮥݡᔢᮝಽ⦹ᩡᮝ໑, bb᮹༉⩶ᩑᰆᮡ20mᯕ݅. Ǎ᳑ྜྷᱥ໕ᮥ
ෙ❭Łĥ⊂ᮡǍ᳑ྜྷᱥ໕ᄞᮝಽᇡ░0.05m ᯕĊ⦹ᩍ0.4m eĊᮝಽ❭Łĥෝ႑⊹⦽⬥ᝅ⦹ᩡᮝ໑, Ǎ᳑ྜྷҾ݉⬉ŝ(end effect)ෝqᦩ⦹ᩍĥ⊂Ǎeᮡ༉⩶ᔢx=0m~18.8mಽᖅᱶ⦹ᩡ
݅(Fig. 1b ₙ᳑). ᅙᝅ⨹ᮡᱥ໕ᄞ᮹ᮁŖ⩶ᔢᨱෙ₉ᯕᱱᮥ
á☁⦹۵äᯕᵝࡽ༊ᱢᯕʑভྙᨱxႊ⨆ᮝಽ᮹ĥ⊂ᮥ᭥ᵝಽ
ᙹ⧪⦹ᩡ݅. Table 3ᨱᱽࡽၵ᪡zᯕᮁ᮹ᵝʑ4aḡ᳑Õᮥ
ᱢᬊ⦹ᩡᮝ໑, ࠺ᯝ᳑Õᮥݡᔢᮝಽ3⫭ᯕᔢၹᅖᝅ⨹ᮥᙹ⧪⦹
ᩍĥ⊂ࡽđŝෝᔑᚁ⠪Ɂ⦹ᩍđŝෝࠥ⦹ᩡ݅. ᯦ᔍb, ᮁŖᇡ
⩶ᔢ, ᮁ᮹ᵝʑၰᮁ᮹❭Ł॒ᮥ݅᧲⦹íᱢᬊ⦹ᩍᝅ⨹ᮥᙹ⧪⦹
ᩡʑভྙᨱฯᮡĥ⊂ᯱഭa᳕ᰍ⦹ḡอ, ᅙםྙᨱᕽ۵ݡ⢽ᱢᯙ
đŝෝ ᱽ⦹Ł á☁⦹Łᯱ ⦽݅.
Fig. 7~Fig. 10ᮡSU/(HS)O=3ၰSL/(HS)O=2.5 ᳑ÕᨱᕽTS=0.79s (CW/LS=0.133), 1.11s(CW/LS=0.073), 1.42s(CW/LS=0.050) ၰ
1.74s(CW/LS=0.039)ෝᱢᬊ⦽Ǎ᳑⩶ᔢ(ྕŖ⍡ᯕᜉ, ᳦slit ᮁŖ
⍡ᯕᜉၰ⬂slit ᮁŖ⍡ᯕᜉ)ŝ᯦ᔍbᨱෙǍ᳑ྜྷᱥ໕ᨱᕽ᮹
ᔢݡ❭Łෝ እƱ ࠥ⦽ äᯕ݅.
Fig. 7ᮡCW/LS=0.133ᯙ᳑Õ᮹đŝಽᕽḢพྕŖ⍡ᯕᜉ᮹
Ğᬑ(case PW)ᨱ᯦ᔍbᯕ᷾a⧉ᨱᦩᱶ❭Łᨱࠥݍ⦹۵
(a)쩁=10°
(b)쩁=20°
(c) 쩁=30°
Fig. 9. Normalized wave height along a wall (x-dir.) by front wall shapes for CW/LS=0.050
(a)쩁=10°
(b)쩁=20°
(c) 쩁=30°
Fig. 10. Normalized wave height along a wall (x-dir.) by front wall shapes for CW/LS=0.039
ᔢݡÑญ(x/LS)aṈᦥḱᮥᙹᯩŁᔢݡ❭Ł۵HS/(HS)Oⴉ2ᨱ
ᙹಕ⦹۵äᮝಽӹ┡ԍᮝ໑, ᯕ۵ḢพྕŖ⍡ᯕᜉᮥݡᔢᮝಽ
⦽ʑ᳕ᩑǍđŝ᪡࠺ᯝ⦽äᯕ݅. ᮁŖ⍡ᯕᜉ᮹Ğᬑᨱᔢݡ❭Ł ۵ⱖ=10° ᳑ÕᨱᕽHS/(HS)Oⴉ0.5, ⱖ=20° ᳑ÕᨱᕽHS/(HS)Oⴉ 0.7, ⱖ=30° ᳑ÕᨱᕽHS/(HS)Oⴉ0.9ಽӹ┡ӹྕŖ⍡ᯕᜉᨱእ⧕
ᱽℕᱥ໕ᨱᕽԏᮡ❭Łaᇥ⡍⧉ᮥᙹᯩᮝ໑, ᯦ᔍbᯕ᷾a⧁
ᙹಾᔢݡ❭Ł۵᷾a⦹ᩡ݅. ⬂ slitŝ᳦slitᨱݡ⦽₉ᯕෝá☁⧕
ᅕʑ᭥⧕x/LS>10ᯙǍeᮥݡᔢᮝಽĥ⊂ࡽᔢݡ❭Łෝᔑᚁ⠪
Ɂ⦹ᩍእƱ⧕ᅕ໕, ⱖ=10°ᯙĞᬑᨱHP30ᯕVP30᮹᧞88%, ⱖ=20°ᯙĞᬑᨱ᧞92 %, ⱖ=30°ᯙĞᬑᨱ᧞96%᮹ᔢݡ❭Ła
ᔑᱶࢉᮝಽᕽ⬂slitᨱ᮹⦽ᔢݡ❭Ła᧞e᯲íӹ┡ԍ݅. ᯕ۵
2₉ᬱ ᝅ⨹ᨱᕽ ⬂ slitᯕ ᳦ slitᨱ እ⧕ ၹᔍĥᙹa ᧞e ᯲í
ӹ┡ӽäᨱᔢ᮲⦹۵đŝᯕ݅. Fig. 8ᮡCW/LS=0.073ᯙ᳑Õ᮹
đŝಽᕽྕŖ⍡ᯕᜉ᮹Ğᬑᨱ۵Fig. 7ŝᮁᔍ⦽❭Łᇥ⡍ෝᅕᯙ
݅. ᮁŖ⍡ᯕᜉ᮹Ğᬑᨱ۵ᔢݡᮁᙹᝅ⡎ᯕqᗭ⧉ᨱᮁŖᇡ
⩶ᔢᨱෙ₉ᯕaÑ᮹ӹ┡ӹḡᦫᦹŁ, ᯦ᔍbᯕᔢݡᱢᮝಽ
ⓑ᳑ÕᨱᕽFig. 7᮹đŝ᪡۵ݍญ⬂slit᮹❭Ła᳦slitᨱ
እ⧕ ᧞e Ⓧí ӹ┡ԍᮝӹ ə ₉ᯕ۵ Ⓧḡ ᦫᦹ݅. Fig. 9۵
CW/LS=0.050᮹ đŝಽᕽ ᮁŖ⍡ᯕᜉ᮹ Ğᬑᨱ ᮁŖᇡ ⩶ᔢᨱ
ෙ₉ᯕ۵Fig. 8ŝzᯕÑ᮹ӹ┡ӹḡᦫᦹ݅. x/LS>6ᯙǍeᨱ
ݡ⧕ ᮁŖ⍡ᯕᜉᮥ ݡᔢᮝಽ ĥ⊂ࡽ ᔢݡ❭Łෝ ᔑᚁ⠪Ɂ⦹໕, ⱖ=10°ᯙĞᬑᨱHS/(HS)Oⴉ0.7, ⱖ=20° ᳑ÕᨱᕽHS/(HS)Oⴉ0.9, ⱖ=30° ᳑ÕᨱᕽHS/(HS)Oⴉ1.1ಽӹ┡ԍᮝ໑, ᯕ۵CW/LS=0.133
᳑Õᨱእ⧕ᔢݡ❭Ła᧞0.2 ᱶࠥⓍíӹ┡ӹ۵äᯕ݅. ᷪ, 2₉ᬱᝅ⨹ᨱᕽӹ┡ӽၵ᪡zᯕᔢݡᮁᙹᝅ⡎ᯕqᗭ⧉ᨱ
ᮁŖ⍡ᯕᜉ᮹ ᗭ❭⬉ŝa ᔢݡᱢᮝಽ qᗭ⦹ʑ ভྙᯕ݅. Fig.
10ᮡCW/LS=0.039᮹đŝಽᕽx/LS>4ᯙǍeᨱݡ⧕ᮁŖ⍡ᯕᜉ
ᮥݡᔢᮝಽĥ⊂ࡽᔢݡ❭Łෝᔑᚁ⠪Ɂ⦹໕, ⱖ=10°ᯙĞᬑᨱ
HS/(HS)Oⴉ1, ⱖ=20° ᳑ÕᨱᕽHS/(HS)Oⴉ1.25, ⱖ=30° ᳑Õᨱᕽ
HS/(HS)Oⴉ1.3ಽӹ┡ԍ݅. ᱥℕᱢᮝಽCW/LS=0.050ᯙ᳑Õᨱ
እ⧕ᔢݡ❭Ła᷾a⦹ᩡᮭᮥᙹᯩ݅. ੱ⦽ᔢݡᮁᙹᝅ⡎ᯕ
qᗭ⧉ᨱ᯦ᔍb᮹᷾aᨱෙᔢݡ❭Ł᮹᷾aĞ⨆ᮡqᗭ
⦹۵ äᮝಽ ᇥᕾࡹᨩ݅.
Fig. 11ᮡHP30 ᝅ⨹ᦩᨱݡ⧕࠺ᯝᔢݡᮁᙹᝅ⡎᮹᳑Õᨱᕽ
᯦ᔍbᨱෙᔢݡ❭Ł᮹ᄡ⪵ෝእƱࠥ⦽äᮝಽᕽ᯦ᔍbᯕ
᷾a⧁ᙹಾ, ᔢݡᮁᙹᝅ⡎ᯕ᯲ᦥḩᙹಾᱽℕᱥ໕᮹ᔢݡ❭Ł۵
᷾a⧉ᮥᙹᯩ݅. ᩑ❭aၽᔾ⦹۵᯦ᔍbჵ᭥ԕᨱᕽྕŖ⍡ᯕ ᜉ᮹Ğᬑᨱ۵❭௲᷾⡎ᯕⓍíၽᔾ⦹ḡอ, ᮁŖ⍡ᯕᜉ᮹Ğᬑᨱ ۵እƱᱢԏᮡ❭Łaᇥ⡍⦹໑əⓍʑ۵ᔢݡᮁᙹᝅ⡎ᨱ
݅݅. ᅙ ᝅ⨹᳑Õ ჵ᭥ԕᨱᕽ CW/LS>0.05ᯙ Ğᬑᨱ۵ ᱽℕ
(a) case HP30 & CW/LS=0.133
(b) case HP30 & CW/LS=0.073
(c) case HP30 & CW/LS=0.050
(d) case HP30 & CW/LS=0.039
Fig. 11. Normalized wave height along a wall (x-dir.) by incident angles
ᱥ໕ᨱᕽ❭௲᷾⡎ᮡၽᔾ⦹ḡᦫᦹᮝ໑, ᯕ్⦽⩥ᔢᮡǍ᳑ྜྷ
ᱥ໕ɝŁᇡ᮹ᦩᱶᖒ⪶ᅕ, ᖁၶᱲᦩ᮹࠺ᱡq॒᮹⊂໕ᨱᕽ
ᮁญ⦹í ᯲ᬊ⦹í ࢁ äᯕ݅.
4. đು
ᅙᩑǍᨱᕽ۵ᮁŖᇡ⩶ᔢ, ᔢݡᮁᙹᝅ⡎, ❭⩶Ğᔍ॒ᨱෙ
ᮁŖ⍡ᯕᜉ᮹ᗭ❭✚ᖒᮥ2₉ᬱၰ3₉ᬱᝅ⨹ᮥ☖⧕Łₑ⦹ᩡ݅.
ᅙ ᝅ⨹ᮝಽᇡ░ ࠥ⇽ࡽ đುᮥ ᧞⦹໕ ݅ᮭŝ z݅.
(1) ❭௲ᯕḢbᮝಽ᯦ᔍ⦹۵Ğᬑ, ᮁŖᇡ⩶ᔢᨱෙၹᔍĥᙹ ۵ᮁᔍ⦽ᮁŖᮉᨱᕽ⬂slitᯙĞᬑa᳦slitᯙĞᬑᨱእ⧕
᧞e᯲íĥ⊂ࡹᨩᮝӹə₉ᯕ۵Ⓧḡᦫᦹᮝ໑, ᱢᱶᔢݡᮁ
ᙹᝅ ⡎ᮡ 0.1~0.15ᯙ äᮝಽ ᇥᕾࡹᨩ݅.
(2) ᮁŖ⍡ᯕᜉ᮹ၹᔍ✚ᖒᮡ᯦ᔍ❭Łᨱ₉ᯕaၽᔾ⦽݅.
ᷪ, ❭⩶ĞᔍaⓑĞᬑa᯲ᮡĞᬑᨱእ⧕᧞eԏᮡၹᔍĥᙹ
ෝ ᅕᩡᮝ໑, Ǎ᳑ྜྷ ᖅĥ ᯕෝ Łಅ⧁ ⦥a ᯩ݅.
(3) Ğᔍ᯦ᔍ❭᳑ÕᨱᕽᮁŖᮉᯕᮁᔍ⧁Ğᬑ, ᮁŖᇡ⩶ᔢ(᳦
slitŝ⬂slit)ᨱෙᱽℕᱥ໕᮹❭Ł₉ᯕ۵Ñ᮹ၽᔾ⦹ḡ
ᦫᦹ݅. ᱥℕᱢᮝಽྕŖ⍡ᯕᜉᨱእ⧕ᮁŖ⍡ᯕᜉ᮹ᔢݡ❭
Łaԏíӹ┡ԉᮥ⪶ᯙ⦹ᩡᮝ໑, ᯕ۵Ǎ᳑ྜྷᱡ໕ᇡ᮹ᦩᱶ ᖒ⪶ᅕၰᬕᩢ⊂໕॒ᨱᕽᮁŖ⍡ᯕᜉᯕᮁญ⧉ᮥ᮹ၙ⦽݅.
(4) Ḣb᯦ᔍ᪡zᯕĞᔍ᯦ᔍ᮹Ğᬑᨱࠥᔢݡᮁᙹᝅ⡎ᯕqᗭ
⦹íࡹ໕ᱽℕᱥ໕᮹❭Ł۵᷾⡎ࡹᨩᮝ໑, ᝅᱽᮁŖ⍡ᯕᜉ
ᖅĥᯝၹᱢᮝಽᱢᬊࡹŁᯩ۵ᮁᙹᝅ⡎ᮥqᦩ⧁ভᖅĥ
❭᳑Õᅕ݅۵⠪ᔢ❭᳑ÕᨱᕽᮁŖ⍡ᯕᜉ᮹⬉ᬊᖒᯕⓍ݅Ł
⧁ ᙹ ᯩ݅.
qᔍ᮹ɡ
ᅙ םྙᮡ ⦽ǎ⧕᧲ŝ⦺ʑᚁḥ⯆ᬱ᮹ ᩑǍእ ḡᬱ(ŝᱽჩ⪙:
20110131)ᮥၼᦥᙹ⧪ࡽᩑǍᯕ໑, ᩑǍእḡᬱᨱqᔍऽพܩ݅.
