Flood Hazard Assessment in Upstream Region of Chao Phraya River

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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 [email protected] http://wikigis.doc.kyushu-u.ac.jp/geo/ 1 Asia Geospatial Forum 24-26 September, 2013

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Asia Geospatial Forum 24-26 September, 2013. 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 [email protected] http://wikigis.doc.kyushu-u.ac.jp/geo/. - PowerPoint PPT Presentation

Transcript of Flood Hazard Assessment in Upstream Region of Chao Phraya River

Page 1: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

Flood Hazard Assessment in Upstream Region of Chao Phraya River

CHAM TAU CHIADoctoral Student

Graduate School of Engineering, Kyushu UniversityCivil and Structural Engineering

[email protected]://wikigis.doc.kyushu-u.ac.jp/geo/ 1

Asia Geospatial Forum 24-26 September, 2013

Page 2: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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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Page 3: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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

Page 4: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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).

Page 5: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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

Page 6: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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

Page 7: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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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Page 8: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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 m3 m

10 KM

Page 9: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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.

Page 10: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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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Page 11: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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 m0 m

> 0 m

Before Correction using Spline Tool After Correction using Spline Tool

Page 12: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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)

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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

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)

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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

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)

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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

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

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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

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

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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

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

Page 18: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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

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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

Land Use Type Affected by Flood Level, 15 October 2011

Area (KM2)

Flood level (M)1m 2m

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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

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%

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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

Type of Affected Land Use based on Capacity

Flood Volume, Million M3

Weekly

Page 22: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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

Page 23: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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

Page 24: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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

Page 25: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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

Page 26: Flood Hazard Assessment in Upstream Region of  Chao Phraya River

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.

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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

Thank you very much for your attention.

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