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Flood Analysis in Geum River& Countermeasure Establishment
Flood Analysis in Geum River& Countermeasure Establishment
the 8th Hydro Asia 2014
Hydraulic and Hydrology
Session 1
Total Water Service Provider K-water
21 Climate Change in Korea
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
Water management under Changes & Challenges
Frequency, Intensity of Flood & Drought in-crease
- Flood damage (billion Won) : 123.6(’71)→1,990.4(’05)
Evaportranspiration & Water demand etc. in-
crease
Regional rainfall deviation & uncertainty in-
creaseTyphoon intensity & Heavy rain increase
- Typhoon intensity : 984→960hpa, 24hpa↓/36yr
- Heavy rainy days : 20→31days, 11days↑/50yr
1 Climate Change in Korea
Total Water Service Provider K-water
22Climatic & Geographical Characteristics in Korea
The 70’s : 1,225mm → Recently : 1,465mm, 19.6% ↑
Since the 1970, drought with every 5-7 years
Annual Precipitation : 1,277mm
2 Climatic Characteristics – Precipitation trends
895
19
77
19
82
19
88
19
94
20
01
20
08
1,007
1,001
953
1,061
1,016
1,383
1,409
1,7361,611
1,6691,791 1,908
Trough : 817.5㎜ (60.7%)Monsoon : 327.0㎜ (24.3%) Typhoon : 201.4㎜ (14.9%)
Trend
5yr 6yr 6yr 7yr 7yr
1465mm
1225mm
Effective Water management is absolutely required
Trough : 362.5㎜ (41.4%) Monsoon : 321.8㎜ (36.7%) Typhoon : 191.8㎜ (21.9%)
Precipitation During Summer Season (JJAS) : 876.1 ㎜ (65% of the Total)
2 Climatic Characteristics – Monthly precipitation
Annual Precipitation : Global 1.6 timesAnnual Precipitation : Global 1.6 times Water per Capita : Global 1/6 timesWater per Capita : Global 1/6 times
1,277
2,629
534 201,364
715 22,741
807 16,427
867 7,794
1,690 4,933
1,220 4,907
627 4,530
2 Climatic Characteristics – Water per capita
Mountainous withMountainous with
Steep slopeSteep slope
Korea landKorea land
Seasonal discharge variation is very severe(Flood season : much water flood,⇒ Dry season : small water drought)⇒
= Raito of Max/Min River discharge
90260
190270
13022
834
1830
3114
0 50 100 150 200 250 300
Han
NakdongKeum
Seomjin
YoungsanYangtze Thames
SeineRhein
NileMississippi
Yodo
Coefficient of regime
2
Water per capita
Geographical Characteristics
Total Water Service Provider K-water
23Geum Gang River & GRRP(River Restoration Project)
3 Geum Gang River & GRRP(River Restoration Project)
3 Geum Gang River & GRRP(River Restoration Project)
Youngju damYoungju dam
HwasunHwasun
DamyangDamyang
Han Riv.Han Riv.
Seomjin Riv.Seomjin Riv.
Nakdan Nakdan
Youngsan Riv.Youngsan Riv.
ChilgokChilgok
GangjeongGoryeong
GangjeongGoryeong
DalseongDalseong
Hapcheon ChangnyeongHapcheon Changnyeong
Changnyeong HamanChangnyeong Haman
GangcheonGangcheon
YeojuYeoju
IpoIpo
SeungchonSeungchon
JuksanJuksan
DamDam WeirWeir Flood Retention Res.Flood Retention Res.
BarrageExpansionBarrage
Expansion
Introduction of GRRP
Andong-Imhaconnection
Andong-Imhaconnection
GumiGumi
SangjuSangju
Bohyeondam
Bohyeondam
Nakdong Riv.Nakdong Riv.
BarrageExpansionBarrage
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.Geum Riv.
BaekjeBaekje
SejongSejong
GongjuGongju
3 Geum Gang River & GRRP(River Restoration Project)
Riverbed and Water Level Profiles of the Geum River
Estuary barrage Daecheong dam
Sejongweir
137 ㎞
GongjuweirBaekje
weir
24.2MCM15.5MCM
5.7MCM
length
depth
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 24.2Hydropower plants
Capacity ( ㎾ ) 2,310 3,000 2,640
Fishway(ea) 1 2 1
Sejong-weir Gongju-weir Baekje-weir
Total Water Service Provider K-water
24 TEAM PROJECT
4 TEAM PROJECT
MISSION
□ Find various solutions to flood problems
at target areas
□ and Verify your solution !
4 TEAM PROJECT
Target area
4 TEAM PROJECT
Target area
AREA 1AREA 2
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
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 phe-
nomenon- Oppose the river improvements by local residents
Riverbed sedimenta-
tion
FLOW
Non-Bank area
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
AREA 2
4 TEAM PROJECT
BANK
BANK
Problems : Sudden river narrows
- Concerned about right-bank erosion by speedy flow veloc-
ity- River bed sedimentation at direct downstream by Bottleneck phe-
nomenon
• 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..
□ 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
Go! Go! Go! Move! Move! Move!
We want your creative idea !
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