3. 1
In 100 years : Temp. 5℃ ↑, precipitation 17% ↑
2 times more than global warming
0.74℃
[Change of Global Mean Temp.]
1.7℃
[Change of Mean Temp. of Korea]
(Source : KMA, Institute)
Climate Change in Korea
4. Water management under Changes & Challenges
Frequency, Intensity of Flood & Drought increase
- Flood damage (billion Won) : 123.6(’71)→1,990.4(’05)
Evaportranspiration & Water demand etc. increase
Regional rainfall deviation & uncertainty increase
Typhoon intensity & Heavy rain increase
- Typhoon intensity : 984→960hpa, 24hpa↓/36yr
- Heavy rainy days : 20→31days, 11days↑/50yr
1 Climate Change in Korea
9. Mountainous with
Steep slope
Korea land
Seasonal discharge variation is very severe
(Flood season : much water ⇒ flood, Dry season : small water ⇒drought)
= Raito of Max/Min River discharge
90
260
190
270
130
22
8
34
18
30
3
114
0 50 100 150 200 250 300
Han
Nakdong
Keum
Seomjin
Youngsan
Yangtze
Thames
Seine
Rhein
Nile
Mississippi
Yodo
Coefficient of regime
2
Water per capita
Geographical Characteristics
10. 23
G e u m G a n g R i v e r &
GRRP(River Restoration Project)
11. 3 Geum Gang River & GRRP(River Restoration Project)
12. 3 Geum Gang River & GRRP(River Restoration Project)
Youngju dam
Hwasun
Damyang
Han Riv.
Seomjin Riv.
Nakdan
Youngsan Riv.
Chilgok
Gangjeong
Goryeong
Dalseong
Hapcheon Changnyeong
Changnyeong Haman
Gangcheon
Yeoju
Ipo
Seungchon
Juksan
Dam Weir Flood Retention Res.
Barrage
Expansion
Introduction of GRRP
Andong-Imha
connection
Gumi
Sangju
Bohyeon
dam
Nakdong Riv.
Barrage
Expansion
Project
Dredging : 43 million ㎥
Multi-purpose Weir : 3
Bank Reinforcement : 117 ㎞
Embanking Agr. Res. : 30
Farmland Remodeling : 17
Small Hydro-power : 3
Eco-stream : 199 ㎞
Bike Road : 301 ㎞
Basin Area : 9,912 ㎢, Basin Length : 397 ㎞
Geum Riv.
Baekje
Sejong
Gongju
13. 3 Geum Gang River & GRRP(River Restoration Project)
Riverbed and Water Level Profiles of the Geum River
Estuary barrage Daecheong dam
Sejong
weir
137㎞
Gongju
weirBaekje
weir
24.2MCM
15.5MCM
5.7MCM
length
depth
14. 3 Geum Gang River & GRRP(River Restoration Project)
Status of Weirs in the Geum River
Sejong-weir Gongju-weir Baekje-weir
Weir Length(m) 348 280 311
Capacity(106 m3) 5.7 15.5 24.2
Hydropower plants
Capacity (㎾)
2,310 3,000 2,640
Fishway(ea) 1 2 1
Sejong-weir Gongju-weir Baekje-weir
19. AREA 1
4 TEAM PROJECT
NO. 21+000
NO. 21+660
Length : L=2,860m (No. 18+550 ~ No. 22+650)
Bank top level: Right(7.75m~9.16m), Left(-)
Flood Level : EL. 6.76m ~ EL. 7.47m (100year return period)
Cultivated Land Altitude: EL. 3.70m ~ EL. 3.75m
FLOW
20. AREA 1
4 TEAM PROJECT
NO. 21+000
NO. 21+660
Problems : Sudden river narrows, Non-bank area(left side)
- Frequent flooding at cultivated land
- River bed sedimentation at direct downstream by Bottleneck phenomenon
- Oppose the river improvements by local residents
Riverbed
sedimentation
FLOW
Non-Bank
area
21. AREA 2
4 TEAM PROJECT
Length : L=1,890m (No. 26+740 ~ No. 28+630)
Bank top level: Right(8.55m~9.23m), Left(10.00m~10.36m)
Flood Level : EL. 8.01m ~ EL. 8.35m (100year return period)
BANK
BANK
22. AREA 2
4 TEAM PROJECT
BANK
BANK
Problems : Sudden river narrows
- Concerned about right-bank erosion by speedy flow velocity
- River bed sedimentation at direct downstream by Bottleneck phenomenon
23. • DEM at target areas
□ Modeling Analysis using 1-D(HEC-RAS,…) & 2-D(CCHE-2D, MIKE,..) tool
Go! Go! Go! Move! Move! Move!
□ Given data :
• A river bed measurement data (CAD-type)
• Frequency flood discharge at target point
• Other necessary data for analysis..
24. □ Segregation of duties
Go! Go! Go! Move! Move! Move!
TEAM Target area Remarks
1 Area1
2 Area2
3 Area1
4 Area2
5 Area1
6 Area2
- Elemental analysis => joint execution(3 teams)
- Find solution => each team
- Verify solution => each team
□ 1 target area for 3 teams
