Received March 6, 2012/ revised April 19, 2012/ accepted June 20, 2013
Copyright ⵑ 2013 by the Korean Society of Civil Engineers
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0)
ǣǣȀȀǤǤȀͳͲǤͳʹͷʹȀ ǤʹͲͳ͵Ǥ͵͵ǤǤʹʹͳͳ
Ǥ ǤǤ
CCHE2D 㯓ⴂ#ⴲⱧ㬚#㬦⬆⊲#♿#㬖♿⬆ⷓ㰒#⇧⬆#ሾ㝞
ୋଠլ ȵ ȵ֫ন ȵֈ
Jang, Eun Kyung*, Ji, Un**, Kwon, Yong Sung***, Yeo, Woon Kwang****
Investigation for Bed Stabilization Methods in the Upstream Channel of Haman Weir Using CCHE2D Model
ABSTRACT
During the four river restoration project, several weirs were constructed in the four rivers to prevent drought and flood, to improve water quality, and to manage water resources. However, due to the weir construction, bed changes are produced in the upstream channel of installed weirs because the incoming flow velocity is reduced and sediment transport capacity is also lowered. Especially, since the Haman Weir is located in the lowest downstream section among newly installed weirs in Nakdong River, bed change and sedimentation problems are expected due to the mild slope and reduced velocity. Therefore, numerical simulation was performed to analyze flow and bed changes in the upstream channel of Haman Weir and to evaluate quantitatively sediment control methods for bed stabilization using CCHE2D model. As a result of flow and bed change simulation after installation of Haman Weir, the flow velocity at the initial condition was faster than the final bed condition with the specific simulation time and it was represented that the locations where bed changes were great were identical for all modeling conditions of flow discharge. In case of 4.5 m of water level lowered from 5.0 m of the management water level at Haman Weir for bed stabilization, the flow velocity was generally faster than the case of the management water level and the continuous erosion was developed at the most narrow channel section as the applied discharge and simulation period were increased. The channel width extension at the most narrow channel section was proposed in this study to prevent and stabilize continuos bed erosion. As a result of numerical analysis, there was no bed erosion after channel width extension and it was presented that the channel geometry extension was effective for bed stabilization at Haman Weir.
Key words : Bed stabilization, Bed change, Channel width extension, Haman Weir, CCHE2D model
Ⅹಾ
4ݡvᔕญʑᔍᨦᮥ☖⧕aྥၰ⪮ᙹྙᱽෝᩩႊ⦹Łᙹḩ}ᖁၰ᳦⧊ᱢᯙྜྷšญෝ᭥⧕4ݡvᨱ݅ᙹ᮹ᅕaᖅ⊹ࡹᨩ݅. ə్ӹᅕ᮹ᖅ
⊹ಽᯙ⧕ᔢඹಽᇡ░ᮁ᯦ࡹ۵ᮁᗮᯕqᗭࡹᨕᮁ᯦ࡽᮁᔍ᮹ᯕᘂ܆ಆੱ⦽ᱡ⦹ࢉᮝಽ៉ᅕᔢඹǍeᨱᕽ᮹⦹ᔢᄡ⪵aၽᔾ⦽݅. ✚⯩⧉
ᦩᅕ۵Ӻ࠺vᨱᖅ⊹ࡽ8}᮹ᅕᵲӺ࠺v↽⦹ඹ݉ᨱᖅ⊹ࡹᨕ᪥อ⦽Ğᔍ᪡ᮁᗮqᗭಽᯙ⧕⦹ᔢᄡ࠺ၰḡᗮᱢᯙ♕ᔍྙᱽ᪡ᇩᨕ⦹
ᔢ᮹ᇩᦩᱶ⪵aᬒⓕäᮝಽᩩᔢࡽ݅. ᯕᨱᅙᩑǍᨱᕽ۵2₉ᬱ༉⩶ᯙCCHE2Dෝᯕᬊ⦹ᩍ⧉ᦩᅕᖅ⊹ᨱෙᅕᔢඹᨱᕽ᮹⮱ၰ
⦹ᔢᄡ࠺ᇥᕾᮥᝅ⦹Łᯕෝ☖⧕⦹ᔢ᮹ᦩᱶ⪵ෝ᭥⦽ႊᦩॅ᮹ᱶపᱢᯙ⠪aෝᝅ⦹ᩡ݅. ⧉ᦩᅕᖅ⊹⬥⮱ၰ⦹ᔢᄡ࠺༉᮹đŝ,
༉ु༉᮹ᮁప᳑ÕᨱᕽⅩʑ⦹ᔢᨱᕽ᮹ᮁᗮᯕᯝᱶḡᗮʑeᯕḡӽ⬥⦹ᔢᨱᕽ᮹ᮁᗮᅕ݅íӹ┡ԍᮝ໑, ᱥℕ༉᮹Ǎeᨱᕽ⦹ᔢᄡ
࠺ᯕⓍíၽᔾ⦽ḡᱱ᮹᭥⊹a༉ुᱢᬊᮁపᨱݡ⧕࠺ᯝ⦹íӹ┡ԍ݅. ᯕᨱ⦹ᔢᦩᱶ⪵ෝ᭥⧕⦹ඹ݉ᙹ᭥ෝ⧉ᦩᅕšญᙹ᭥5.0
սėॡ
mᨱᕽ4.5 mಽᱡ⦹┍Ğᬑ, ᮁᗮᇥ⡍۵šญᙹ᭥ᯝভᅕ݅ᱥၹᱢᮝಽíӹ┡ԍᮝ໑⦹⡎ᯕaᰆ᳢ᮡḡᱱᨱᕽ᮹⋉⩥ᔢᮡ⦹ඹ݉
ᙹ᭥ᱡ⦹ᨱšĥᨧᯕḡᗮᱢᮝಽӹ┡ԍ݅. ᯕᨱᅙᩑǍᨱᕽ۵⦹⡎ᯕaᰆ᳢ᮡḡ⩶᮹⦹⡎ᮥ⪶ݡ┅۵ႊჶᮥᱽᦩ⦹ᩡᮝ໑ᙹ⊹༉᮹ᇥ ᕾđŝ, ⦹⡎⪶ݡ⬥ḡ⩶ᨱᕽḡᗮᱢᯙ⋉ᯕᩩᔢࡹ۵Ǎeᨱᕽ᮹⦹ᔢᄡ࠺ᮡÑ᮹ၽᔾ⦹ḡᦫᦥ⦹ᔢ᮹ᦩᱶ⪵⬉ŝaᯩ۵äᮝಽӹ┡
ԍ݅.
áᔪᨕ ⦹ᔢᦩᱶ⪵, ⦹ᔢᄡ࠺, ⦹⡎⪶ݡ, ⧉ᦩᅕ, CCHE2D ༉⩶
1. ᕽು
⦹ᨱᅕෝᖅ⊹⧁Ğᬑ, b᳦ᬊᙹ᮹≉ᙹaᬊᯕ⦹Łᵝᬕ
॒ᮥ ᭥⦽ ᙹ᭥᳑ᱩᯕ a܆⦹໑ ᳑ᙹ᮹ ᩎඹෝ ႊḡ⦹۵ ॒᮹
ᯕᱱᯕᯩ݅(ᱶ᳦⪙᪡ᮅᬊԉ, 2009). ə్ӹᅕ᮹ᖅ⊹۵⦹
ᔢඹಽᇡ░ᮁ᯦ࡹ۵ᯱᩑᱢᯙ⮱ᮥႊ⧕⦹໑ᮁᗮᮥqᗭ┉
݅. ᮁᗮ᮹qᗭ۵ᮁᔍᯕᘂ܆ಆᱡ⦹᮹ᬱᯙᯕࡹ໑ᔢඹಽᇡ░
ᮁ᯦ࡽᮁᔍ۵ᅕᔢඹǍeᨱ♕ᱢࡹíࢉᮝಽ៉⦹ᔢ᮹ᇩᦩᱶ⪵
ෝⅩ௹⦽݅. ᯕ౨íၽᔾ⦽♕ᔍ۵ᅕ᮹ʑ܆ᱢᯙ⊂໕ᨱᦦᩢ⨆ᮥ
ၙ⋁ ᬑಅa ᯩᮝ໑ ⪮ᙹ᭥ ᔢ, ᱡᙹᬊప ᱡ⦹, ┢ᙹᨱ ᮹⦽
⪹Ğ᪅ᩝ॒ᨱݡ⦽݅᧲⦽ྙᱽॅ᮹ᬱᯙᯕࢁᙹᯩ݅(ᮁǭȽ᪡
ᬑ⬉ᖎ, 1990). ǎԕ ⦹᮹ Ğᬑ 4ݡv ᔕญʑ ᔍᨦᮝಽ ᯙ⧕
4 ݡvᨱ݅ᙹ᮹ᅕaᖅ⊹ࡹᨩᮝ໑, ✚⯩Ӻ࠺vᔕญʑᔍᨦ⇵ḥ
Õᖅࡽ8}ᅕ᮹ᮁᔍ♕ᱢྙᱽ۵ᮁḡšญ⊂໕ᨱᕽၹऽ
á☁ࡹᨕ⧁äᮝಽᩩᔢࡽ݅. əᵲ18ŖǍ(֥2 ⧉ᦩ1ḡǍ) ḡᩎᨱÕᖅࡽ⧉ᦩᅕ᮹Ğᬑ8}᮹ᅕᵲӺ࠺v↽⦹ඹ݉ᨱᕽ
᭥⊹⦹Łᯩᮝ໑᪥อ⦽Ğᔍ᪡ᮁᗮqᗭಽᯙ⧕ḡᗮᱢᯙ♕ᔍྙ
ᱽaၽᔾ⧁äᮝಽᩩ⊂ࡽ݅. ᕽ⦹ᔢᄡ࠺᮹ᱶపᱢᩩ⊂ŝ
ྙᱽᱱ ᇥᕾ ၰ ᯕᨱ ෙ ᅕ ᔢඹ ⦹ᔢ᮹ ᦩᱶ⪵ ႊᦩᨱ ݡ⦽
á☁a ၹऽ ⦥⧁ äᮝಽ ❱݉ࡽ݅.
ᯝၹᱢᮝಽݱᯕӹᅕᔢඹᨱᕽ᮹♕ᔍෝᱡq⍽⦹ᔢᮥᦩᱶ
⪵┅۵ႊᦩᨱ۵♕ᱢࡽ☁ᔍෝᵡᖅᰆእಽᵡᖅ⦹۵ႊჶ, ⪮ᙹ
ᮁ᯦ࡹ۵ᮁᔍෝႊඹᙹಽಽ႑ᔍ⦹۵ᷪ႑ᔍႊჶ, ᙹ᭥ᱡ⦹
ಽᯱᩑ⮱ᮥᮁࠥ⦽⬥♕ᱢ☁ᔍෝ႑ᔍ┅۵ᮁᔍ⥭్ᝒႊჶ
॒ᯕᯩ݅(Ji et al., 2011). ᯕ్⦽♕ᔍᱡq⬉ŝᨱݡ⦽ᩑǍಽ۵
Teal and Remus(2001)ᯕၙǎSharpe ⪙ෝݡᔢᮝಽHEC-6T
༉⩶ᮥᯕᬊ⦽♕ᔍᱡqႊᦩᇥᕾᩑǍෝᙹ⧪⦹ᩡᮝ໑, ᱡᙹḡ
ᙹ᭥ෝԏ⇵۵⥭్ᝒႊჶᯕ݅ෙ♕ᔍᱡqႊᦩᨱእ⧕⬉ŝᱢᯙ
äᮝಽ ᱽ⦹ᩡ݅. ✚⯩ ǎԕ᮹ Ğᬑ ʡǭ⦽(2011)ŝ ḡᬕ ॒ (2011a)ᯕӺ࠺v⦹Ǎࢲᨱᕽ᮹ᵡᖅ, ⥭్ᝒႊჶəญŁ⦹ࠥ᮹
⦹⡎⇶ᗭෝ☖⦽♕ᔍᱡqႊᦩ॒ᨱݡ⧕CCHE2D ༉⩶ᮥᯕᬊ⦹
ᩍ ᱶపᱢᯙ⠪aෝ ᝅ⦽ ၵᯩᮝ໑ ⥭్ᝒ ႊჶŝ⦹⡎⇶ᗭ
ႊჶᯕᵡᖅႊჶᮥݡℕ⧁ᙹᯩ۵⬉ŝᱢᯙႊჶᯕŁ⠪a⦹ᩡ
݅. ḡᬕ॒(2011b)ᮡӺ࠺v⦹Ǎࢲᔢඹᨱᕽ⦹⡎ᯕɪ⪶ݡࡹ۵
Ǎeᨱᮁᔍa♕ᱢࡹ۵⩥ᔢᮥ᪥⪵┅ʑ᭥⧕⦹⡎ᮥ⇶ᗭ⦹۵
ႊჶᮥᱽᦩ⦹ᩡᮝ໑ᯕᨱݡ⧕2₉ᬱᙹ⊹༉⩶ᮥᯕᬊ⦹ᩍ⦹⡎᮹
ᄡ⪵ᨱෙ⦹ᔢᄡ⪵ෝᱶపᱢᇥᕾᮝಽᇥᕾ⦹ᩡ݅. ⦹⡎᮹⇶ᗭ
ၰ⪶ݡᨱෙ⮱ၰ⦹ᔢᄡ࠺ᨱݡ⦽ᩑǍಽ۵ʡᵝᕾ(2007)ᯕ
⦹⡎᮹ǎᇡᱢ⇶ᗭၰ⪶ݡᨱෙᮁᙹ⮱᮹ᄡ࠺ᮥ1₉ᬱ
ᙹ⊹⧕ᕾ ☖⧕ ᝅ⦹Ł ᙹญ༉⩶ᝅ⨹ᮥ ☖⧕ እƱ⦹ᩡ݅.
ᅙ ᩑǍᨱᕽ۵ Ӻ࠺v ⧉ᦩᅕෝ ݡᔢᮝಽ ᯙ᭥ᱢᯙ ᅕ Õᖅ
⬥᮹⦹ᔢᄡ⪵ෝᇥᕾၰྙᱽᱱᮥࠥ⇽⦹Ł, ᯕᨱݡ⦽⦹ᔢᦩᱶ⪵
ႊᦩá☁ෝ᭥⧕ᙹ᭥ᱡ⦹᪡⦹⡎⪶ݡႊჶᨱݡ⦽2₉ᬱᙹ⊹༉⩶
ᮥᯕᬊ⦹ᩍᱶపᱢᯙ⠪aෝᝅ⦹ᩡ݅. ᅙᩑǍ᮹༊ᱢᮡℌṙ, CCHE2D ༉⩶ᮥᯕᬊ⦹ᩍ⧉ᦩᅕᖅ⊹ᨱෙ⮱ၰ⦹ᔢᄡ࠺ᮥ
༉᮹⦹Łᅕᖅ⊹ᨱෙᅕᔢඹǍe᮹ᙹญᱢ, ḡ⩶⦺ᱢᄡ⪵ෝ
ᱶపᱢᮝಽᇥᕾ⦹۵äᯕ݅. ࢹṙ, ⦹ඹ݉ᙹ᭥ᱡ⦹ෝ☖⦽⦹ᔢᦩ ᱶ⪵ႊᦩŝ⦹⡎ᯕaᰆ᳢ᮡǎᇡᱢᯙǍeᨱݡ⧕⦹⡎ᮥ⪶ݡ⦹
۵⦹ᔢᦩᱶ⪵ႊᦩᮥbbᙹ⊹༉᮹ෝ☖⧕ᱶపᱢᮝಽᇥᕾ⦹۵
äᯕ໑↽᳦ᱢᮝಽ۵⧉ᦩᅕᔢඹ᮹⦹ᔢ᮹ᦩᱶ⪵ෝ᭥⦽ႊᦩॅ
ᮥ⠪a⦹Łᝅᱽᱢᬊa܆ᖒᨱݡ⧕ᇥᕾ⦹ʑ᭥⦽äᯕ݅. ✚⯩
ᯝၹᱢᯙ2₉ᬱ⦹ᔢᄡ࠺༉᮹᮹Ğᬑ⠪໕ᱢḡ⩶ĞĥaŁᱶࡹᨕ
༉᮹aᙹ⧪ࡹ۵ʑᚁᱢ⦽ĥಽᯙ⧕⦹ᦩ⋉ᮥ࠺ၹ⦽⦹ᔢᄡ࠺
᮹ᯱᩑ⩥ᔢᮥᩩ⊂⦹۵ߑྙᱽᱱᯕၽᔾ⦽݅. ᅙᩑǍᨱᕽ۵ᯕ్
⦽ᙹ⊹༉᮹᮹ʑᚁᱢ⦽ĥෝŁಅ⦹ᩍ⦹⡎᮹ᄡ⪵a⦹ᔢᄡ࠺ᨱ
ၙ⊹۵ᩢ⨆ᮥ⧉ᦩᅕᔢඹǍeᨱݡ⧕ᱶపᱢᮝಽ⠪a⦹ᩡᮝ໑, ᯕ్⦽ᩑǍđŝ۵⦹⡎ᄡ⪵ႊჶᨱݡ⦽⦹ᔢᦩᱶ⪵ႊჶᮝಽ៉
᮹ ᱢᬊ a܆ᖒᮥ ⠪a⦹ʑ ᭥⦽ ʑⅩᯱഭಽ ⪽ᬊ ࢁ ᙹ ᯩᮥ
äᯕ݅.
2. ݡᔢḡᩎ
Ӻ࠺vᮁᩎᮡ⦽ၹࠥԉ࠺ᇡᨱ᭥⊹⦹ᩍᇢᮝಽ۵⦽vᮁᩎ, ᕽᮝಽ۵ ɩv ၰ ᖍḥv ᮁᩎŝ ᱲ⦹Ł ᯩ۵ ᬑญӹᨱᕽ
ࢱჩṙಽⓑᮁᩎᯕ݅. ᮁᩎ໕ᱢᮡԉ⦽໕ᱢ᮹᧞25%ᯙ23,384.2 km
2ᯕŁᮁಽᩑᰆᮡ510.4 kmᯕ݅. Ӻ࠺vᮁᩎ᮹ᮁᩎ⠪Ɂ⡎ᮡ
46.3 km ᯕŁ, ḡඹ ᵲᨱᕽ۵ ԉvᯕ aᰆ Ⓧ໑ ᮁᩎ⠪Ɂ ⡎ᮡ
18.68 km, ᩑvᙹపᮡš⊂ᗭᄥಽ1,244 mm ᱶࠥ᮹ᇥ⡍ෝ
ᅕᯙ݅(ǎ☁Ʊ☖ᇡ, 2009). ᅙᩑǍ᮹ᙹ⧪Ǎe(Fig. 1)ᮡӺ࠺v
ᔕญʑ18ŖǍᔍᨦჵ᭥ᵲ⧉ᦩᅕᨱᕽᔢඹ4.2 km Ǎeᯕ݅.
ĞᔢԉֶࠥǑʙł໕ᨱᕽ⧉ᦩǑ⋁ᇢ໕ᔍᯕᨱ᭥⊹⦽⧉ᦩᅕ
۵ᅕᩑᰆ567.5 m(a࠺ᅕ146 m, Łᱶᅕ421.5 m)ಽᖅ⊹ࡹᨩᮝ
Fig. 1. Study Reach of the Lower Nakdong River
໑, 2011֥10ᬵ29ᯝᇡಽŖᔍa᪥ഭࡹᨕᯝၹᯙᨱíŖ}ࡹᨩ
݅. ᦿᮝಽ⧉ᦩᅕ᮹ᖅ⊹ಽᯙ⧕ᮁప, ᙹ᭥, ᮁᔍప॒⦹✚ᖒᯕ
ᄡ⪵ ࢁäᮝಽ ❱݉ࡹ໑ ⧉ᦩᅕᖅ⊹ ⬥ ᩩᔢࡹ۵ḡ⩶ᯱഭ᪡
ŝÑ ၰ ⩥ᰍ᮹ ᙹญ, ᙹྙ, ᮁᔍప ᯱഭ ॒ᮥ ᙹḲ⦹ᩍ 2₉ᬱ
⦹ᔢᄡ࠺ ༉⩶ CCHE2Dෝ ᯕᬊ⦹ᩍ ༉᮹ෝ ᙹ⧪⦹ᩡ݅.
3. ᙹ⊹༉᮹᮹}
3.1 ୡࡦ܄ࢫࡦ෴Ց࣪୨
ᅙᩑǍᨱᕽᖁᱶ⦽2₉ᬱᙹ⊹༉⩶ᯙCCHE2D ༉⩶ᮡ⦹᮹
⮱✚ᖒŝ⦹ᔢᄡ࠺ᮥ❭ᦦ⦹ʑ᭥⧕Mississippi ݡ⦺᮹NCCHE (National Center for Computational Hydroscience and Engineering) ᨱᕽ}ၽ⦽༉⩶ᯕ݅. CCHE2D ༉⩶ᮡ༉᮹Ǎeᨱݡ⦽ḡ⩶ᮥ
Ǎ⇶⦹۵CCHE2D MESH Generator ⥥ಽəఉŝǍ⇶⦽ḡ⩶ŝ
ĥᔑᨱ ⦥⦽ ᯦ಆ᳑Õᮥ ᯕᬊ⦹ᩍ ĥᔑ ၰ đŝෝ ᅕᩍᵝ۵
CCHE_GUI ⥥ಽəఉᮝಽǍᖒࡹᨕᯩ݅. CCHE2D ༉⩶᮹ⓑ
✚Ḷᮝಽ۵⦹ᔢ☁᯦ࠥᇥ⡍ෝ᯦ಆ⦹ᩍ༉᮹aa܆⦹໑ⅾᮁᔍ, ᗭඹᔍəญŁᇡᮁᔍbb᮹ᯕᘂ⩶┽ᨱݡ⧕ᕽ༉᮹aa܆⦹݅
۵ᱱᯕ݅. ੱ⦽ⅾᮁᔍ༉᮹Wu et al.(2000)᮹ᮁᔍపŖᯕ
ᱢᬊa܆⦹໑ᗭඹᔍӹᇡᮁᔍ༉᮹ᨱ۵Ackers and White (1973), Engelund and Hansen(1967), Wu et al.(2000), SEDTRA Module(Garbrecht et al. 1995) ॒ᩍ్aḡᮁᔍపŖᮥ݅í
ᱢᬊ⦹ᩍ ༉᮹⧁ ᙹ ᯩ݅.
CCHE2D ༉⩶ᮡ⮱ᨱݡ⦽ḡ႑ႊᱶᮝಽ3₉ᬱ౩ᯕסᷩ
ႊᱶᮥݡᇡᇥ᮹}ᙹಽ⮱ᯕᯕඹ⮱ᯥᮥᱢᬊ⦹ŁᩑḢ ᮝಽᙹᝍᱢᇥ⦽2₉ᬱᬕ࠺పႊᱶᮥᔍᬊ⦽݅. ᮁᔍ༉᮹۵ᙹᝍ
ᱢᇥࡽ2₉ᬱᯕᘂ-⪶ᔑႊᱶᮥᔍᬊ⦹໑⦹ᔢᄡ࠺ᮡᮁᔍᩑᗮႊ
ᱶᮥ ᱢᬊ⦽݅(⦽ǎᙹᯱᬱ⦺⫭, 2005).
ᅙᩑǍ᮹ᖁᱶ༉⩶ᯙCCHE2D᮹Ğᬑ⦹ᔢᄡ࠺༉᮹ෝ᭥⦽
ᮁᔍపᔑᱶŖၰᮁᔍᯕᘂ⩶┽ෝᔍᬊᯱaᖁ┾⦹ࠥಾࡹᨕᯩ
݅. ⦹ᔢᄡ࠺༉᮹᮹ĞᬑᮁᔍᯕᘂŖᮥᨕਅäᮥᱢᬊ⧁äᯙa
᪡ᮁᔍᯕᘂ⩶┽ෝᨕਅäᮝಽđᱶ⧁äᯙaᨱ⦹ᔢᄡ࠺
sᯕaᰆၝq⦹íӹ┡ӹ໑ᯕࢱaḡᔍ⧎ᯕ⦹ᔢᄡ࠺༉⩶᮹
ᵝࡽᅕᱶᄡᙹᯕ݅. ݡᔢǍeᨱᕽáᅕᱶᮥᙹ⧪⦹ʑ᭥⧕⪶ᅕ⧁
ᙹᯩ۵ᮁ⬉⦽ŝÑᯱഭ۵ḥ࠺ḡᱱ᮹ᮁᔍపš⊂ᯱഭ᪡Ӻ࠺v
⦹Ǎࢲᔢඹ᮹ᵡᖅᱥ⬥ᨱᙹ⧪ࡽ⦹ᔢᄡ⪵ḡ⩶⊂పsᯕ݅.
ᕽ࠺ᯝǍeԕᯱഭ۵ᦥܩḡอᯱഭaᮁ⬉⦹ḡᦫᮥĞᬑ
aᰆɝᱲ⦽Ǎeᨱᕽ᮹⩥ᰆᯱഭෝ⪽ᬊ⦹۵ äᯕᬱ⊺ᯕအಽ
ᅙᩑǍᨱᕽ۵ᮁᔍᯕᘂŖᖁ┾ᮥ ᭥⧕Ӻ࠺v⦹Ǎࢲᨱᕽ᮹
ᮁᔍపŖၰᮁపⓍʑᄥၝqࠥᇥᕾᨱݡ⧕⦽ᬱ(2010) ၰḡᬕ॒(2010)ᯕᙹ⧪⦽Ӻ࠺v⦹ඹ⦹ᔢᄡ࠺༉⩶áᅕᱶᨱ
ݡ⦽ᖁ⧪ᩑǍđŝෝₙŁ⦹ᩡ݅. ᩑǍᨱ໕2₉ᬱᙹ⊹༉᮹ (CCHE2D ༉⩶ᯕᬊ)Ӻ࠺v⦹ඹᨱᕽᝅᱽၽᔾ⦹۵⦹ᔢᄡ⪵
᪡aᰆɝᱲ⦽⦹ᔢᄡ࠺đŝsᮥࠥ⇽⧕ԙŖᮡAckers-White (1973) ŖᯕŁᱽ⦹ᩡᮝ໑ᯕᨱᅙᩑǍᨱᕽࠥAckers- White(1973) Ŗᮥ⦹ᔢᄡ࠺༉᮹ෝ᭥⦽ᮁᔍపŖᮝಽ₥┾⦹
ᩡ݅. ੱ⦽ᮁᔍᯕᘂ⩶┽ᖁᱶᮥ᭥⧕ᕽᗭඹᔍ᪡ᇡᮁᔍᯕᘂ⩶┽
ෝ༉ࢱᱢᬊ⦹ᩍ⧉ᦩᅕᔢඹ༉᮹Ǎeᨱݡ⧕ᔍᱥ༉᮹ෝᙹ⧪⦽
đŝ, ᗭඹᔍᯕᘂ⩶┽ෝᱢᬊ⧩ᮥভ۵ǎᇡᱢᯙᖙǕ⩥ᔢอ༉᮹
ࡹᨩᮝ໑ᇡᮁᔍᯕᘂ⩶┽᮹Ğᬑ۵༉᮹Ǎeᨱᱥℕᱢᮝಽ⦹ᔢ ᄡ࠺ᯕၽᔾ⦹ᩡ݅. ᕽᅙᩑǍᨱᕽ۵ᇡᮁᔍᯕᘂ⩶┽ෝᖁᱶ
⦹ᩍ ༉᮹ෝ ᙹ⧪⦹ᩡ݅.
Fig. 2. Channel Geometry with River Width Extension
Table 1. Simulation Conditions of Discharge, Water Level, and Simulation Time
Discharge (Q, m3/s)
Downstream Water Level (Hd, m)
Simulation Time (Days)
500
5
10 30 90
4.5
10 30 90
1,000
5
10 20 30
4.5
10 20 30
2,000
5
1 3 10
4.5
1 3 10
3.2 ߚୀ߹
ᅙᩑǍᨱᕽ۵ᙹ⊹༉᮹ෝ᭥⦽ḡ⩶ᯱഭಽ⦽ǎᙹᯱᬱŖᔍᨱ ᕽ 2010֥ᨱ ᝅ⦽ Ӻ࠺v ᔕญʑ 18ŖǍ(ֶ2 ⧉ᦩ1 ḡǍ) ᔍᨦᝅᖅĥ(⦽ǎᙹᯱᬱŖᔍ, 2010) ᯱഭෝ⪽ᬊ⦹ᩡ݅. ḡ⩶ᯱ
ഭ۵ ḡࠥᔢ᮹ ॒Łᖁᮥ Łಅ⦹ᩍ ᗭ᮹ b ᱩᱱᨱᕽ ᖁ⩶
ᅕe⦹ᩡŁ ᅕ ᖅ⊹ ⬥ ḡ⩶ᮡ ᵡᖅ ᖅĥ݉໕ᮥ ⪽ᬊ⦹ᩡᮝ໑, ᯕෝ☖⧕ᅕᖅ⊹ၰᵡᖅ⬥݉໕ᮥŁಅ⦹ᩍ⦹ᔢᦩᱶ⪵ႊᦩ
á☁ෝ᭥⦽ᙹ⊹༉᮹ෝᙹ⧪⦹ᩡ݅. ḡ⩶ᯱഭ۵CCHE2D ᔢᨱᕽ
ᔍᬊ⧁ ᙹ ᯩ۵ ᅕe ʑჶ ᵲ ༉⩶᮹ ๅە ᔢᨱᕽ ⇵⦹۵
Structured ʑჶᮥ ᔍᬊ⦹ᩍ ᅕe⦹ᩡ݅. ༉⩶᮹ mesh Ċᯱ۵
ᙹ⊹༉᮹᳑Õᨱ30 m eĊŝ10 m eĊᮝಽӹ٥ᨕǍ⇶⦹ᩡ
݅. ⧉ᦩᅕᖅ⊹ᨱෙᔢඹᨱᕽ᮹⦹ᔢᄡ࠺ŝ⦹ඹ݉ᙹ᭥ᱡ⦹ᨱ
ෙ⦹ᔢᄡ࠺ᮥ༉᮹⧁ভ۵mesh eĊᯕ30 mᯙḡ⩶ᮥᔍᬊ⦹
ᩡŁ⦹⡎⪶ݡᨱෙ⦹ᔢᄡ࠺ᮥ༉᮹ᨱ۵⦹⡎⪶ݡಽᯙ⦽
ḡ⩶ᄡ⪵aᗭ᮹ᱩᱱᅕe᮹ᄡ⪵ᨱၙ⊹۵ᩢ⨆ᮥ↽ᗭ⪵
⦹ʑ᭥⧕mesh eĊᯕ10 mᯙḡ⩶ᮥᔍᬊ⦹ᩡ݅. ⦹⡎ᮥ⪶ݡ⦽
Ǎeᮡ⦹⡎⇶ᗭa᯲ࡹ۵⧉ᦩᅕᔢඹ1.32 km ḡᱱᮝಽᇡ░
⮱ႊ⨆ᮝಽ 0.96 km ਉᨕḥ ḡᱱʭḡᯕ݅. ⦹⡎ ⪶ݡǍeᮡ
Fig. 2 ᪡zᮝ໑↽ݡ⪶ݡࡽ⦹⡎ᮡ140 mᯕ݅. ⧉ᦩᅕḡᱱᨱᕽ᮹
Manning ᳑ࠥĥᙹ۵ Ӻ࠺vᙹĥ ⦹ʑᅙĥ⫮(ᄡĞ)(ǎ☁Ʊ☖
ᇡ, 2009)ᨱᕽ ᇥᕾࡽ 0.023ᮥ ᱢᬊ⦹ᩡ݅.
⦹ᔢ☁ᯱഭ۵Ӻ࠺vᔕญʑ18ŖǍ(ֶ2 ⧉ᦩ1ḡǍ) ᔍᨦ
ᝅᖅĥᅕŁᕽᨱᕽᱽ⦽sᮥᔍᬊ⦹ᩡ݅. ༉᮹Ǎe᮹ݡ⢽᯦
Ğᮡ0.1 mm᪡0.2 mmෝᔍᬊ⦹ᩡᮝ໑እᵲᮡ2.675ෝᔍᬊ⦹ᩡ
݅. ༉௹⊖᮹ࢱ̹۵2.0 m, ᯕᘂa܆⦽༉௹᯦Ğᮡ0.25 mmಽ
ᖁᱶ⦹ᩡ݅. ᮁ᯦ᮁᔍపĥᔑᮥ᭥⦽ᮁప-ᮁᔍపšĥᮡᮁᔍప
ᯱഭa ᯩ۵ ᪽šŝ ḥ࠺ḡᱱ ᵲ ⧉ᦩᅕᨱᕽ ᧞ 7 km ਉᨕḥ
ḥ࠺ḡᱱ᮹š⊂ᮥ⪽ᬊ⦹ᩡᮝ໑, 2009֥ࠥᮁప᳑ᔍᅕŁᕽ(ǎ
☁Ʊ☖ᇡ, 2010)ᨱᕽ ᱽࡽ šĥᮥ ᔍᬊ⦹ᩡ݅.
ӽඹ༉⩶᳑Õᮝಽ۵Parabolic Eddy Viscosity Modelᮥᔍᬊ
⦹ᩡŁᙹ⊹⧕ᕾʑჶᵲWall Slipness Coefficient۵0.5, əญŁ
ษᔢ┽᮹ḡ⩶ᯕฯᮡĞᬑ᪅ඹaၽᔾ⧉ᮥqᦩ⦹ᩍษᔢ┽
ḡ⩶᮹⨩ᬊʑᵡᙹ᭥۵0.04 mෝᔍᬊ⦹ᩡ݅. ༉᮹eeĊᮡ
༉᮹ ᳑Õᄥಽ 60 sec eĊ(1,440 ⫭/day)ᮥ ᱢᬊ⦹ᩡ݅.
3.3 ࡦଭՍ
ᅙᩑǍᨱᕽ۵ℌṙ, ⧉ᦩᅕᖅ⊹ᨱෙᅕᔢඹ᮹⮱ၰ
⦹ᔢᄡ࠺ᮥ༉᮹⦹Łࢹṙ, ⦹ඹ݉ᙹ᭥ᱡ⦹ෝ☖⦽⦹ᔢᄡ࠺༉᮹
ෝ☖⧕⦹ᔢᦩᱶ⪵⬉ŝෝᇥᕾ⦹໑ษḡสᮝಽ⦹⡎ᯕ⇶ᗭࡹ۵
Ǎe᮹ḡ⩶ᄡ⪵ෝ☖⦽⦹ᔢᦩᱶ⪵⬉ŝෝᱶపᱢᮝಽ༉᮹⦹ᩡ
݅. ⧉ᦩᅕᖅ⊹ᨱෙᅕᔢඹ᮹⮱ၰ⦹ᔢᄡ࠺ᮥ༉᮹⦹ʑ
᭥⦽ ᳑Õᨱᕽ ⦹ඹ݉ ᙹ᭥۵ ⧉ᦩᅕᨱᕽ᮹ šญᙹ᭥ 5.0 mෝ
(a) Velocity Distribution (b) Water Depth Fig. 3. Velocity and Water Depth Distribution for Initial Bed Condition (Q = 1,000 m3/s)
(a) Initial Bed Condition (b) Bed Condition after 10 Days Fig. 4. Velocity Distribution for Q = 2,000 m3/s
ᱢᬊ⦹ᩡ݅(⦽ǎᙹᯱᬱŖᔍ, 2010). ⧉ᦩᅕᨱᕽᮁప3,200 m
3/s
ෝⅩŝ⦹íࡹ໕ᱥℕᙹ᭥a⦹ඹ݉šญᙹ᭥5.0 mෝᬵඹ⦹í
ࡹ໑ᮁపᯕ350 m
3/s ၙอᯝĞᬑ༉᮹Ǎeᨱᕽ⦹ᔢᄡ࠺ᯕÑ᮹
ၽᔾ⦹ḡᦫíࡽ݅. ᯕᨱᮁప350 m
3/s᪡3,200 m
3/s᮹ჵ᭥ᨱᕽ
ᩑ⠪Ɂ30ᯝ᮹ၽᔾᯝᙹෝw۵ᮁప1,000 m
3/s ෝ༉᮹᳑Õᮝಽ
ᖁᱶ⦹ᩡᮝ໑ᮁపᄥၝqࠥᇥᕾᮥᙹ⧪⦹ʑ᭥⧕ᩑ⠪Ɂ90ᯝ᮹
ၽᔾᯝᙹෝw۵500 m
3/s ᪡ᩑ⠪Ɂ10ᯝ᮹ၽᔾᯝᙹෝw۵
2,000 m
3/s ᮁపᮥ⇵aᱢᬊ⦹ᩡ݅. ᮁపᄥḡᗮʑeᮡbᮁప᮹
ᩑ⠪Ɂ ၽᔾᯝ ᙹ ᯕ⦹᮹ sॅᮥ ᖁᱶ⦹ᩡ݅.
⦹ඹ݉ᙹ᭥ᱡ⦹ෝ☖⦽⮱ၰ⦹ᔢᄡ࠺༉᮹ᮁపŝḡᗮʑ e᮹Ğᬑ⧉ᦩᅕᖅ⊹ᨱෙ⮱ၰ⦹ᔢᄡ࠺༉᮹᳑Õŝ࠺ᯝ⦹
íᱢᬊ⦹ᩡᮝ໑⦹ඹ݉ᙹ᭥۵šญᙹ᭥ᨱᕽ0.5 mෝᱡ⦹┉
4.5 m ෝᱢᬊ⦹ᩡ݅. Table 1ᮡ⧉ᦩᅕᖅ⊹⬥᮹⮱ၰ⦹ᔢᄡ࠺
༉᮹᪡ ⦹ඹ݉ ᙹ᭥ᱡ⦹ᨱ ෙ ⦹ᔢᦩᱶ⪵ ⬉ŝ ༉᮹ ᮁప,
⦹ඹ݉ᙹ᭥əญŁḡᗮʑeᨱݡ⦽༉᮹᳑Õᮥᱶญ⦽äᯕ݅.
ੱ⦽⦹⡎ᯕɪĊ⯩⇶ᗭࡹᨕ⦹ᔢᄡ࠺ᯕⓍíၽᔾ⦹۵Ǎe᮹
⠪໕ᱢḡ⩶ᄡ⪵ෝ☖⦽⦹ᔢᦩᱶ⪵⬉ŝෝ⠪a⦹ʑ᭥⧕Fig.
2᪡zᮡ⦹⡎⪶ݡḡ⩶ᮥǍ⇶⦹ᩡᮝ໑ᯕভ᮹༉᮹᳑Õᮡᮁప
1,000 m
3/s, ⦹ඹ݉ᙹ᭥5.0 mෝᱢᬊ⦹Łḡᗮʑe30ᯝ࠺ᦩ᮹
⦹ᔢᄡ⪵ෝ ༉᮹⦹ᩡ݅.
4. ༉᮹đŝᇥᕾ
4.1 ੲ࣪ড౿บঃ࣡ܛࢫࢂ୪
⧉ᦩᅕᖅ⊹⬥ᮁపᯕ1,000 m
3/s( ᩑ⠪Ɂ30ᯝၽᔾ)ᯝভ᮹
Ⅹʑ⦹ᔢᨱᕽ᮹⮱đŝ۵Fig. 3ŝz݅. ᮁᗮᇥ⡍(Fig. 3(a))ෝ
ᔕ⠕ᅕ໕༉᮹Ǎe↽ᔢඹ݉ᨱᕽᇡ░⦹⡎ᯕ⪶ݡࡹʑᱥʭḡ᮹
ᮁᗮᮡ0.175 m/sᨱᕽ0.576 m/s᮹ᇥ⡍ෝᅕᯕ໑, ⦹⡎᮹⪶ݡಽ
ᮁᗮᯕɪĊ⯩qᗭ⦹ᩍ0 m/sᨱᕽ0.466 m/s᮹sᮥᅕᯕ݅a
⦹ඹಽiᙹಾᱱ₉⦹⡎ᯕ⇶ᗭࡹᨕ0.238 m/sᨱᕽ0.566 m/s᮹
ᮁᗮᯕၽᔾ⦹ᩡ݅. ↽ݡᮁᗮᮡ0.833 m/sಽ⦹⡎ᯕaᰆ᳢ᮡ
⧉ᦩᅕ ᔢඹ 0.78 km ḡᱱᨱᕽ ၽᔾ⦹ᩡ݅. ᮁప 500 m
3/s᪡
2,000 m
3/s ᮹Ğᬑ1,000 m
3/s ᯝভ᪡↽ݡᮁᗮᯕၽᔾ⦽ḡᱱᯕ
࠺ᯝ⦹ᩡᮝ໑ᮁᗮᇥ⡍۵bb↽ᗭ0 m/sᨱᕽ↽ݡ0.417 m/s,
ᮁపᯕ2,000 m
3/s ᯝভ↽ᗭ0 m/sᨱᕽ↽ݡ1.661 m/s᮹sᮥ
ӹ┡ԩ݅. ᮁపᯕ500 m
3/s ᯝভ↽ᔢඹ݉ᨱᕽ⦹⡎ᯕ⪶ݡࡹʑ
Fig. 5. Cross Sections for Comparison of Bed Changes after 30 Days (Q = 1,000 m3/s)
(a) Cross Section No. 39
(b) Cross Section No. 67
(c) Cross Section No. 162
(d) Cross Section No. 197
Fig. 6. Cross Section for Bed Changes Comparison after 10 Days
ᱥʭḡ᮹ᙹᝍᮡ6 mᨱᕽ8 m ᔍᯕ᮹ᇥ⡍ෝᅕᯕ݅a⦹⡎ᯕ
⪶ݡࡹ۵Ǎe᮹᳭ᦩᨱᕽ᧞13 mಽᙹᝍᯕʫᨕḥ݅. ⦹⡎ᯕ
⪶ݡࡹ۵Ǎeᨱᕽ⦹⡎ᯕaᰆ᳢ᮡḡᱱʭḡ᮹ᙹᝍᮡ9 mᨱᕽ
14 m᮹ ᇥ⡍ෝ ᅕᯙ݅(Fig. 3(b)).
Ⅹʑ⦹ᔢŝ ⦹ᔢᄡ࠺ᯕ ၽᔾ⦽ ⬥᮹ ⦹ᔢᨱᕽ᮹ ᮁᗮᇥ⡍ෝ
እƱ⦹ʑ᭥⧕2,000 m
3/s ᮁపᯕၽᔾ⦽ĞᬑⅩʑḡ⩶ᨱᕽ᮹
ᮁᗮᇥ⡍᪡10ᯝeḡᗮᱢᮝಽ2,000 m
3/s ᮁపᯕၽᔾ⦽⬥ᄡ⪵
ࡽ⦹ᔢᨱᕽ᮹ᮁᗮᇥ⡍ෝFig. 4᪡zᯕእƱ⦹ᩍӹ┡ԕᨩ݅.
ᱥၹᱢᮝಽⅩʑ⦹ᔢᨱᕽ᮹ᮁᗮᨱእ⧕10ᯝ⬥ᄡ⪵ࡽ⦹ᔢᨱᕽ ᮹ᮁᗮᯕ۱ญíӹ┡ԍᮝ໑, ݉໕ᯕ⇶ᗭࡹ۵Ŕᨱᕽ᮹↽ݡᮁᗮ
ᮡbb1.661 m/s, 1.241 m/sಽ0.42 m/s qᗭࡹᨩŁⅩʑ⦹ᔢ᮹
Fig. 7. Comparison of Thalweg Line Changes (Flow Direction )
↽ݡᮁᗮᯕ᧞25% íӹ┡ԍ݅. 500 m
3/s ᪡1,000 m
3/s ᮹
ĞᬑࠥⅩʑ⦹ᔢ᮹ᮁᗮᨱእ⧕ḡᗮʑeᯕḡԁᙹಾᮁᗮᯕqᗭ
⦹۵äᮝಽӹ┡ԍ݅. ᯕ۵ḡᗮe࠺ᦩၽᔾ⦽⦹ᔢᄡ࠺ᨱ᮹⦽
ᩢ⨆ᯝ äᮝಽ ❱݉ࡽ݅.
⧉ᦩᅕᖅ⊹⬥500 m
3/s, 1,000 m
3/s, 2,000 m
3/s ᮹ᮁపᯕ
bbၽᔾ⧩ᮥভ᮹⦹ᔢᄡ࠺đŝෝᔕ⠕ᅕ໕ᮁప500 m
3/s᮹
Ğᬑ10ᯝ, 30ᯝ, 90ᯝ᮹ḡᗮʑe࠺ᦩၽᔾ⦽↽ݡ⋉Ł(-)۵
ḡᗮʑeᄥಽbb-0.8 cm, -2.4 cm, -7.7 cmಽᅕᔢඹ0.78 km ḡᱱᨱᕽӹ┡ԍᮝ໑↽ݡ♕ᱢŁ۵༉᮹Ǎe↽ᔢඹ݉ᨱᕽ
1.43 mಽӹ┡ԍ݅. ᮁప1,000 m
3/sᨱݡ⧕ḡᗮʑe10ᯝ, 20ᯝ, 30 ᯝᮥᱢᬊ⦹ᩍ༉᮹⦽đŝ↽ݡ⋉Ł(-)۵ᅕᔢඹ0.78 kmᨱ ᕽḡᗮʑeᄥಽbb-0.839 m, -1.331 m, -1.683 mಽӹ┡ԍ݅.
↽ݡ♕ᱢŁ᮹Ğᬑᅕᔢඹ2.6 km ḡᱱᨱᕽၽᔾ⦹ᩡᮝ໑ḡᗮʑ eᄥಽ bb 0.231 m, 0.470 m, 0.729 ma ♕ᱢࡹᨩ݅. ᮁప
2,000 m
3/s ᱢᬊ↽ݡ⋉Ł(-)᪡♕ᱢŁaၽᔾ⦽᭥⊹۵ᮁప
500 m
3/s᪡1,000 m
3/sෝᱢᬊ⎑ᮥভ᪡࠺ᯝ⦹íӹ┡ԍᮝ໑
ḡᗮʑe1ᯝ, 3ᯝ, 10ᯝ࠺ᦩၽᔾ⦽↽ݡ⋉Ł۵ḡᗮʑeᄥಽ
-0.81 m, -2.078 m, -4.311 mಽӹ┡ԍ݅. ↽ݡ♕ᱢŁ᮹Ğᬑ
ḡᗮʑeᄥಽ0.78 m, 2.119 m, 5.557 mಽӹ┡ӹ⋉ŝ♕ᱢ
༉ࢱḡᗮʑeᯕḡԉᨱ2႑ᯕᔢ᮹⦹ᔢᄡ࠺ᯕၽᔾ⦹ᩡ݅.
⧉ᦩᅕᖅ⊹⬥ᮁప1,000 m
3/s ᯝভ⦹ᔢᄡ࠺ᯕⓍíၽᔾ⦽
݉໕᮹ ᭥⊹۵ Fig. 5᪡ z݅. ᮁప 500 m
3/s᪡ 2,000 m
3/s᮹
Ğᬑᨱࠥ⦹ᔢᄡ࠺ᯕⓍíၽᔾ⦽݉໕᮹᭥⊹۵࠺ᯝ⦽äᮝಽ
ӹ┡ԍᮝ໑༉᮹Ǎeᨱᕽ᮹b⬂݉໕᭥⊹۵⧉ᦩᅕಽᇡ░ᔢඹ
3.3 km ḡᱱ(39ჩ ݉໕), 2.6 km ḡᱱ(67ჩ ݉໕), 0.78 km ḡᱱ(162ჩ ݉໕)ŝ 0.15 km ḡᱱ(197ჩ ݉໕)ᯕ݅.
༉᮹ ᮁపᨱ ෙ ⬂݉໕ ⦹ᔢᄡ⪵ෝ ᦥᅕʑ ᭥⧕ ࠺ᯝ⦽
ḡᗮʑeᯙ 10ᯝᯕ Ğŝ⦽ ⬥ ⦹ᔢᄡ࠺ đŝෝ Fig. 6ŝ zᯕ
እƱ⦹ᩡ݅. ᮁప500 m
3/s ᮹Ğᬑ10ᯝ⬥⦹ᔢᄡ࠺ᮡÑ᮹ᨧᨩᮝ ໑, 1,000 m
3/s᮹ᮁపᯕ10ᯝ࠺ᦩၽᔾ⦽Ğᬑ↽ݡ♕ᱢŁ۵
ᅕᔢඹ2.6 km ḡᱱᯙ67ჩ݉໕ᨱᕽ0.231 mಽӹ┡ԍŁ↽ݡ
⋉Ł۵ᅕᔢඹ-0.78 km ḡᱱᯙ162ჩ݉໕ᨱᕽ-0.893 mಽ
ӹ┡ԍ݅. 39ჩŝ 197ჩ ⬂݉໕ᨱᕽ۵ ⦹ᔢᄡ࠺ᯕ ᔢݡᱢᮝಽ
Ⓧḡᦫᦹ݅. ᮁప2,000 m
3/s a10ᯝ࠺ᦩၽᔾ⦽Ğᬑᨱ۵እƱࡽ
༉ु ⬂݉໕ᨱᕽ ⦹ᔢᄡ࠺ᯕ ၽᔾ⧩ᮝ໑ ↽ݡ ♕ᱢŁ۵ 5.557 m, ↽ݡ⋉Ł۵-4.311 mಽᮁప1,000 m
3/sᯝভ᪡࠺ᯝ⦽
ḡᱱᯙ 67ჩŝ 162ჩ ݉໕ᨱᕽ ӹ┡ԍ݅. ✚⯩, 2,000 m
3/s ᮹
Ğᬑ39ჩŝ67ჩ݉໕ᨱᕽⅩʑ⦹ᔢᯝভ᮹ᵝᙹಽᨱᕽ♕ᱢᯕ
Ⓧíၽᔾ⦹ᩡŁ᳭ᦩŝᬑᦩᨱᕽ᮹⋉ᯕ ӹ┡ӹḡᗮʑeᯕ
ʙᨕḩᙹಾᵝᙹಽ᮹᭥⊹aᯕ࠺⦹۵⩥ᔢᯕӹ┡ԁäᮝಽᩩᔢ
ࡹᨩ݅.
Fig. 7ᮡ Ⅹʑ⦹ᔢŝ b ᮁపᄥ ḡᗮʑe 10ᯝ ⬥᮹ ᳦݉໕
⦹ᔢŁෝእƱ⦽äᯕ݅. ᳦݉໕ࠥ۵༉᮹Ǎeԕb⬂݉໕ᨱᕽ᮹
↽ᝍ⦹ᔢŁෝӹ┡ԙäᯕ݅. ᮁప500 m
3/s᮹Ğᬑ⦹ᔢᄡ࠺ᮡ
Ñ᮹ᨧᨩᮝ໑1,000 m
3/s ᮹Ğᬑ⦹⡎ᯕ⇶ᗭࡹ۵ᅕᔢඹ0.65 kmᨱᕽ0.85 km Ǎeᨱᕽ۵⋉⩥ᔢӹ┡ԍᮝ໑, əӹນḡ
Ǎeᨱᕽ᮹⦹ᔢᄡ࠺ᮡÑ᮹ᨧᨩ݅. 2,000 m
3/s ᮹ĞᬑÑ᮹༉ु
Ǎeᨱᕽ⦹ᔢᄡ࠺ᯕⓍíӹ┡ԍŁ↽ᝍ⦹ᔢŁ᮹ ᔢᯕaᰆ
Ⓧí ӹ┡ӽ Ǎeᮡ ᅕ ᔢඹ 2.6 kmᨱᕽ 2.7 km Ǎeᯕ໑ ᧞
2 mᨱᕽ 5 m᮹ ᄡ⪵a ၽᔾ⦹ᩡ݅. ↽ᝍ⦹ᔢŁa Ⅹʑ⦹ᔢᨱ
እ⧕ᬒʫᨕḥĞᬑ۵ᅕᔢඹ0.32 kmᨱᕽ0.95 km Ǎeŝ
2.7 kmᨱᕽ3.1 km Ǎeᨱᕽӹ┡ԍ݅. 3.5 km ᯕᔢ᮹↽ᔢඹǍe ᮹⦹ᔢŁ⋉ᮡᙹ⊹༉᮹ᔢᮁ᯦ᮁᔍప᮹Ŗɪᯕᇡ᳒⦹ᩍၽᔾ
⦽Ğĥ᳑Õ᮹ᩢ⨆ᨱ᮹⦽äᯕအಽđŝᇥᕾᨱᕽ۵ᱽ⦹ᩡ݅.
4.2 ୠඒค۩ࠜധঃੲ୨ฃࢺੲंজ ᅙᩑǍᨱᕽ۵⧉ᦩᅕᔢඹ⦹ᔢ᮹ᦩᱶ⪵ႊᦩᨱݡ⦽á☁ෝ
᭥⧕⦹ඹ݉ᙹ᭥(H
d)ᱡ⦹ᨱෙ⮱ၰ⦹ᔢᄡ࠺ᮥ༉᮹⦹Ł
ᅕᔢඹ⦹⡎ᯕɪĊ⯩⇶ᗭࡹᨕḡᗮᱢᯙ⋉⩥ᔢᯕᩩᔢࡹ۵
ḡᱱ᮹ ⦹⡎ᮥ ⪶ݡ⦹ᩍ ⦹ᔢᄡ࠺ᮥ ༉᮹⦹ᩡ݅.
⦹ඹ݉ᙹ᭥ᱡ⦹ᨱෙ⮱ᮥᇥᕾ⦹ʑ᭥⧕ᮁప1,000 m
3/s ᯝভ⦹ඹ݉šญᙹ᭥5.0 m ᬕᩢࢁĞᬑ᪡0.5 m ᙹ᭥ᱡ⦹ෝ
☖⧕⦹ඹ݉ᙹ᭥a4.5 mಽᬕᩢࢁĞᬑߑݡ⧕ᙹ⊹༉᮹ෝᙹ⧪⦹
Ł ᮁᗮᇥ⡍ෝ Fig. 8ŝ zᯕ እƱ⦹ᩡ݅. ⦹ඹ݉ ᙹ᭥ ᱡ⦹
༉᮹ǍeᱥℕᨱÙℱᮁᗮᇥ⡍a5.0 mᯝভᅕ݅íӹ┡ԍ
݅. ↽ݡᮁᗮ᮹Ğᬑ⦹⡎ᯕ⇶ᗭࡹ۵ᅕᔢඹ0.78 km ḡᱱ(162ჩ
݉໕)ᨱᕽ ⦹ඹ݉ ᙹ᭥a 5.0 mᯝ ভ 0.833 m/s, 4.5 mᯝ ভ
0.920 m/sಽ ӹ┡ԍ݅. ᮁప500 m
3/s᮹Ğᬑ᪡2,000 m
3/s᮹
(a) Hd = 5.0 m (b) Hd = 4.5 m Fig. 8. Velocity Distribution for the Initial Bed Condition (Q = 1,000 m3/s)
(a) Hd = 5.0 m (b) Hd = 4.5 m
Fig. 9. Bed Change Comparison with Different Downstream Water Levels after 30 Days (Q = 1,000 m3/s)
Table 2. Comparison of Bed Change of Cross Sections by Different Downstream Water Level (Hd) Cross
Section No.
Q 500 m3/s (after 90 Days) 1,000 m3/s (after 30 Days) 2,000 m3/s (after 10 Days)
Hd 5.0 m 4.5 m 5.0 m 4.5 m 5.0 m 4.5 m
No. 39 0.00129 m 0.00982 m 0.578 m 1.197 m 2.601 m 2.679 m
No. 67 0.000149 m 0.000936 m 0.729 m 1.431 m 5.557 m 6.622 m
No. 162 -0.00947 m -0.0264 m -1.683 m -2.224 m -4.311 m -4.776 m
No. 197 0.00221 m 0.00922 m 0.323 m 0.495 m -0.556 m -0.981 m
Ğᬑᨱᕽࠥ⦹ඹ݉ᙹ᭥ෝᱡ⦹⎑ᮥভᱥၹᱢᮝಽᮁᗮᇥ⡍a
í ӹ┡ԍᮝ໑, ⦹ඹ݉ ᙹ᭥ ᱡ⦹ ᮁప 500 m
3/s ᯝ ভ
↽ݡᮁᗮᮡ0.462 m/s, 2,000 m
3/sᯝভ↽ݡᮁᗮᮡ1.831 m/sಽ
ӹ┡ӹ⦹ඹ݉ᙹ᭥5.0 mᯝভᅕ݅↽ݡᮁᗮᯕ10% ᱶࠥí
ӹ┡ԍ݅.
⦹ඹ݉ᙹ᭥ᱡ⦹ᨱෙ⦹ᔢᄡ࠺༉᮹đŝෝᇥᕾ⦹ʑ᭥⧕
1,000 m
3/s ᮁపᯕၽᔾ⦹Ł⦹ඹ݉ᙹ᭥abb5.0 mᯝভ᪡
4.5 m ᮝಽᬕᩢࢁĞᬑߑݡ⧕ḡᗮʑe30ᯝ⬥᮹⦹ᔢᄡ࠺ᮥ
እƱ⦹ᩡ݅(Fig. 9). ⦹ඹ݉ᙹ᭥ෝᱡ⦹⎑ᮥĞᬑ⋉⪚ᮡ
♕ᱢ॒᮹⦹ᔢᄡ࠺ᯕⓍíၽᔾ⦽ḡᱱᮡ⧉ᦩᅕᖅ⊹⬥⦹ᔢᄡ࠺
đŝᨱᕽӹ┡ӽḡᱱ(Fig. 5)ŝ࠺ᯝ⦹ᩡ݅. 39ჩ݉໕ᨱᕽ⦹ඹ݉
ᙹ᭥5.0 mᯝভ۵0.578 m᮹♕ᱢᯕၽᔾ⧩ᮝ໑4.5 mᯝভ
1.197 m ᮹ ♕ᱢᯕ ၽᔾ⧩݅. 67ჩ ݉໕ŝ 197ჩ ݉໕ᨱᕽࠥ
♕ᱢᯕ ၽᔾ⧩ᮝ໑5.0 mᯝ ভ 0.729 m᪡ 0.323 m, 4.5 mᯝ
ভ 1.431 m᪡ 0.495 mಽ ӹ┡ԍ݅. ⦹⡎ᯕ aᰆ ᳢ᮡ Ǎeᯙ
67 ჩ ݉໕ᨱᕽ۵ ⋉ᯕ ၽᔾ⦹ᩡᮝ໑ 5.0 mᯝ ভ -1.683 m, 4.5 mᯝভ-2.224 m᮹⋉ᯕၽᔾ⧩݅. ⦹ᔢᄡ࠺ᯕⓑ݉໕ॅᨱ
ݡ⧕ ༉᮹ ᮁపᄥ ⦹ඹ݉ ᙹ᭥ᱡ⦹ ᱥŝ ⬥᮹ ↽ݡ ⋉Ł ၰ
♕ᱢŁෝ Table 2ᨱᕽ እƱ⦹ᩡ݅.
ᅙᩑǍᨱᕽ۵⦹ᔢᦩᱶ⪵ႊᦩ᮹á☁ෝ᭥⧕⦹ඹ݉ᙹ᭥ᱡ⦹
(a) Original Bed (b) Channel Width Extension Fig. 10. Velocity Distribution for the Initial Condition (Q = 1,000 m3/s)
Table 3. Comparison of Velocity and Bed Changes by Time for No. 162 Section (Q = 1,000 m3/s)
Geometry Condition Velocity (m/s) Bed Change (m)
Initial Bed after 10 Days after 20 Days after 30 Days after 10 Days after 20 Days after 30 Days
Original Bed 0.827 0.745 0.696 0.661 -0.941 -1.491 -1.869
Channel Width Extention 0.440 0.441 0.441 0.443 0.012 0.013 0.008
(a) Original Bed (b) Channel Width Extension
Fig. 11. Bed Change Comparison after 30 Days (Q = 1,000 m3/s)
