Flood Hazard Assessment in Upstream Region of Chao Phraya River CHAM TAU CHIA Doctoral Student...
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Transcript of Flood Hazard Assessment in Upstream Region of Chao Phraya River CHAM TAU CHIA Doctoral Student...
Flood Hazard Assessment in Upstream Region of Chao Phraya River
CHAM TAU CHIA
Doctoral Student
Graduate School of Engineering, Kyushu University
Civil and Structural Engineering
http://wikigis.doc.kyushu-u.ac.jp/geo/ 1
Asia Geospatial Forum 24-26 September, 2013
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Introduction
Thailand government put efforts to protect its city area from flood. However, 2011 Thai flood still brought huge damage to city area.
This research focus on upstream region to study on rivers capacity and flowing. Also, it is important to understand its influence to downstream area of Chao Phraya River.
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九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Introduction
Ranking of Costly Disaster 2011 Japan Earthquake and Tsunami 1995 Japan Kobe earthquake 2004 US Hurricane Katrina 2011 Thailand Flood
Based on The World Bank report
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Introduction
The total damage and losses from the 2011 floods in Thailand amounted to THB 1.43 trillion (USD 46.5 billion).
Rehabilitation and reconstruction needs over the next two years and beyond are estimated at THB 1.5 trillion (USD 50 billion).
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Introduction
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Introduction
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100km
N7A/N67 – Nan RiverY17 – Yom RiverP7A/P17 – Ping RiverC2 – Chao Phraya River
Position of Gauging System
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Objectives
Simulate past flood model to analyze in details for both factors and risks of 2011 flood.
To understand if Control flooding in upstream flooding will able to mitigate downstream flooding.
Examine if Bung Boraphet act as key role to minimize damages of flood event.
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九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
3.4 m
2 m
6 m
4 m
5.8 m
2.5 m
0.8 m
3 m
10 KM
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Flood Scenario in Aug- Sept 2011
Aug 6, 2011 Aug 16, 2011 Sept 21, 2011
Based on post-analysis results, an estimation of 1 m as the inundation depth is used to estimate the flood amount as 2500 million m3 at the peak period (lacking data from September 20 and 21) in the Ping and Nan river areas about 100 km upstream from Nakhon Sawan.
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Research Methodologies
In order to simulate the past flood events ArcGIS
Produce quantitative results to obtain flood volume for past flood event.
MIKE FLOOD ( MIKE 11 + MIKE 21) Create mathematical modelling to simulate past flood
event then verify with Royal Irrigation Department (RID) and Thai Monitoring System (TMS) data.
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九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Result of GIS Analysis
< 0 m
0 m
> 0 m
Before Correction using Spline Tool After Correction using Spline Tool
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Total Volume:P17 : 105144.0 m3/sMIKE : 100383.4 m3/s
Difference: 4760.56 m3/s(< 400 million m3)
M3/S
Real (RID)
Comparison of Water discharge at STA P17 (Result of MIKE FLOOD)
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Total Water Discharge:N67 : 129548.00 m3/sMIKE : 112909.52 m3/s
Difference: 16638.48 m3/s(< 1438 million m3)
M3/S
Real (RID)
Simulated(MIKE)
Comparison of Water discharge at STA N67(Result of MIKE FLOOD)
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Total Volume:C2 : 297058.0 m3/sMIKE : 279254.6 m3/s
Difference: 17803.35m3/s(< 1538 million m3)
21 Sept to 25 Oct
Total Volume Difference Volume
RID 1300 million m3
MIKE 400 million m3 < 900 million m3
M3/S
Real (RID)
Simulated(MIKE)
Comparison of Water discharge at STA C2(Result of MIKE FLOOD)
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
6 AugMIKE
6 AugTMS
6 AugArcGIS
ArcaGIS
MIKE
Comparison of Evaluated Methodology
29 million m3
298 million m3
Total 640 million m3 Total 270 million m3
Different of 370 million m3
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
21 SeptMIKE
21 SeptTMS
21 SeptArcGIS
ArcGIS
MIKE
Total 3260 million m3
Total 5010 million m3
Different of 1,748 million m3
Comparison of Evaluated Methodology
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
15 OctMIKE
15 OctTMS
15 OctArcGIS
ArcGIS
MIKE
Total 3840 million m3
Total 4270 million m3
Different of 430 million m3
Comparison of Evaluated Methodology
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Flood Level (m)
Affected by water level of Bung Boraphet
Comparison of Flood Level in between Field Investigation and Simulated Result
Affected by water level of Chao Phraya River
Huge warehouse
Nearby dike
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Land Use Type Affected by Flood Level, 15 October 2011
Area (KM2)
Flood level (M)1m 2m
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Land use 2010 Affected by flood
MajorAffected Area
(km)Total Area
(km) Percentage Rank
Paddy field 1536.52 7131.4 21.5% 1
Urban area 97.59 553.8 17.6% 2
Dry field 392.95 4174.92 9.4% 3
Grassland 309.94 3390.95 9.1% 4
Forest 12.65 229.99 5.5% 5
Water 59.03 74.45 79.3%
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Type of Affected Land Use based on Capacity
Flood Volume, Million M3
Weekly
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Comparison of Land use changed From Year 1996 to Year 2010
Percentage
Land Use Type
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Land Use Map
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Year 1996 Year 2010
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Flood Mitigation Measures
Forest and Land Rehabilitation/Conservation More Reservoirs Land Use/Development Regulation Protection for Provincial Urban Areas Absorbing Flood Peak and Increasing Income in
Irrigated Floodplain
Based on 2012 Chao Phraya River basin flood control master plan
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
In order to store amount of 900 million m3, the most effective measures will be absorbing flood peak and increasing income in irrigated floodplain.
To store 400 million m3 in mainstream, height of existing dike along mainstream can be increase to enhance its capacity.
Bung Boraphet only has the capacity of 30 million m3 with area of 5km2 and water depth of 6m. It is needed to research on other available swamps to store the extra amount of flood volume and use for irrigation areas in the dry season.
Flood Mitigation Measures
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Conclusions
It is clearly those small streams at upstream area able to store 1,200 – 1,500 million m3 during August to September 2011 and ease the flood condition.
ArcGIS used data from satellite imagery to produce quantitative results of past flood event. On the other hand, MIKE FLOOD uses hydraulic data to simulate the past event and it able to estimate the future flood for risk reduction.
九州大学大学院 工学研究院 地圏環境研究室 Environmental Geotechnology Lab., Graduate School of Engineering, Kyushu University
Thank you very much
for your attention.
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