INTEGRATE HIGH PERFORMANCE

2D FLOOD SIMULATION INTO

FEWS

Kevin, Che Hao Chang National Taipei University of Technology

Chih Tsung Hsu National Center for High-performance Computing

FEWS USER DAY, Deltares, Delft, Nederland, 2015/10/28 – 29

CONCEPT CHANGING

OF EMERGENCY

RESPONSE

1998

Hydro information center system

2004

Disaster emergency response system

2010

Informaiotn service for disaster

preventation

WCD

Hydro information Center

WRA

Hydro-disaster Prevention Center

2014-2015

Hydro information Emergency response Open Information Public Participation

Mobile APP Disaster Notify APP

Response fast and Wide

spread

Forecast ability

FEWS_Taiwan : 2014 MATMO

Dacha River

radar rainfall

and water level

Observed and Forecast Water Level

Radar Rainfall

RAINFALL AND WATER LEVELS FOR

WARNING AND ACTION

2+3hr

Warning level 1

Warning leve 2

5+3hr

2+3hr Warning leve 3

Top of Dike

Warning

Evacuate

Prepare Flood Plain

DECISIONS: Q & A

集水區降雨量資訊

觀測雨量 預報預報雨量

觀測水位 預報水位

水位資訊

2011 Typhoon Nanmadol Chaochu station, Dongang River

08:00 water level almost reach Warning level 3.

Questions： 1. Will water level go up

or down? 2. How much time to

reach warning level 2?

FORECAST ABILITY

集水區降雨量資訊

觀測雨量 預報預報雨量

觀測水位 預報水位

水位資訊

13:00 water level probably reach Warning level 2

Questions： 1. Will water level go up

or down? 2. How much time to

reach warning level 2?

2011 Typhoon Nanmadol Chaochu station, Dongang River

RAINFALL-RUNOFF V.S. PRECIPITATION ON 2D

CASE STUDY – MEINONG DRAINAGE

40 hrs, 40 m ㄇ CPU Time 40m Cell count.

Mass Balance Error

RR used 14min 67,440 22 cms

Precipitation on 2D

1hr 67,440 9,500 cms

100 YR FLOOD (direct precipitation on 2D) 100YR FLOOD (RR used)

9

HSINANN DRAINAGE

10

SEWER SYSTEM

11

97 hrs simulation

CPU Time : 2hr 27 min

2009 Morakot

10m ground resolution

Active cells 122808

Total cells 258796

12 km2

12

SIANN-1734, Waterlevel mean (m AD)

TeeChart

2009/8/102009/8/92009/8/82009/8/7

13

12

11

ground-level 13.4m

bottom-level 10.82m

street-level 11.82m

PROFILE VIEW

13.4 m

3RD GENERATION

STATIC FLOOD MAPS

Static flood potential maps were generated at 2000, 2005, and 2015 respectively.

Current features include:

Rivers systems,

unban drainages and swers,

hydraulics structures,

pumping stations,

detail digital terrain models up to 10m

Major urban areas

Design Events

Expect more?

SIMULATION TO OPERATIONAL USE

1D Channel

2D Contour

1

2

3

4

1

2

3

4

1m DEM

1m DSM 1

2

3

4

20m DSM

1

2

3

4

DYNAMIC FLOOD SIMULATION

2D flood model reuse

Online input with observed and forecast rainfall data

Rapid emergency response: 4 times a day

Integrated with real time flood elevation observation

FEWS_Taiwan + 2D Flood Models = Model base or Model Warehous

SIMULATION TO OPERATIONAL USE

Each operation cover past 6 hrs,

running 2 hrs, forecast 6 hrs,

total 14 hrs.

Emergency Response Start

2hrs Running & Preparing

Report Deliver

6hr Forecast

The 1st Operation

The 2nd Operation

Operation start

8hr

8hr 6hr

14hr

12hr

20 hrs

12 hrs Observation (State Run)

Scheduling of

4 operation in 24 hours

The 3rd Operation

8hr 6hr

14hr

Operation start

Report Deliver

6hrs Observation

6 hrs Observation

2hrs Running & Preparing

2hrs Running & Preparing

6hr Forecast

6hr Forecast

6hr Forecast

Operation start

Report Deliver

6hr Forecast

COMPUTATION FIT TO

PRACTICE PURPOSE

Rainfall – duration DEM resolution (m) CPU time (sec)

500Y-12hr 10 23,379 (6.5hrs)

500Y-12hr 20 3,301 (<1hr)

60km2

Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz

Simulated Area>4000km2

40m

20m

Part-1

Part-2 Part-3

Zone-1

Zone-2

Zone-3

Zone-4

Part-3

Part Full Simulated Area

Zone

20m

Zone-2

20m

40m

40m

40m

20m

Unit 1 Unit 2 Unit 3

MC+FSS with

Smart Partitioning

Multi-grid & domain decomposition

Taichung City

Part-1

Part-2 Part-3

500 yr 12hr design event

最大淹水深度

Increase rainfall intensity

Part-3

Part Grid Type 10m 20m 40m 80m

Part-3 Active cell 3,857,964 884,925 221,224 59,264

Part-3 Total cell 17,579,598 4,081,515 1,021,416 255,672

Part Resolution CPU time (sec) Area of Max Flood (km2)

Part-3 20m 32,816 (>9 hrs) 140.81

Part-3 40m 11,529 (>3hrs) 168.81

Part-3 80m 3,644 (1hr) 178.17

Intel® Core™ i7-3770K CPU @ 3.50GHz

40m

20m

Part-1

Part-2 Part-3

Zone-1

Zone-2

Zone-3

Zone-4

Part-3

Part Full Simulated Area

Zone

20m

Zone-2

20m

40m

40m

40m

20m

Unit 1 Unit 2 Unit 3

MC+FSS with

Smart Partitioning

Multi-grid & domain decomposition

Dachia River

Wu River

Dali River

Han River

Highway

Elevation Difference

Zone-1

Zone-2

Zone-3

Zone-4

Zone-5

Zone-6

Zone-7

Part-3

Zone Compare with Flood Area Corret

Coefficient Flood Depth Error (m)

Zone-1 (20m) Part-3 (20m) 0.9361 0.0174

Zone-2 (20m) Part-3 (20m) 0.9496 0.0114

Zone-3 (20m) Part-3 (20m) 0.9682 0.0201

Zone-4 (20m) Part-3 (20m) 0.9233 0.0261

Zone-5 (20m) Part-3 (20m) 0.9999 0.0002

Zone-6 (20m) Part-3 (20m) 0.9776 0.0163

Zone-7 (20m) Part-3 (20m) 0.9990 0.0000

Flood Area Correct Coefficient Aa =

Ac

Af+Ao−Ac

Af : Simulation of total Part 3 as reference, Ao: Zone simulation, Ac:intersection of Af and Ao，

Flood Depth Error Da =

Do i −Df i ∗Aini=1

Aini=1

Df: Simulation of total Part 3 as reference ；Do: Zone simulation；Ai:area

Zone Compare with Flood Area Corret

Coefficient Flood Depth Error (m)

Zone-1 (20m) Zone-1 (10m) 0.7985 0.0826

Zone-1 (40m) Zone-1 (10m) 0.6567 0.1159

Zone-1 (80m) Zone-1 (10m) 0.5198 0.1366

Zone-2 (20m) Zone-2 (10m) 0.7743 0.0953

Zone-2 (40m) Zone-2 (10m) 0.6592 0.1327

Zone-2 (80m) Zone-2 (10m) 0.5365 0.1516

Zone-3 (20m) Zone-3 (10m) 0.7676 0.0705

Zone-3 (40m) Zone-3 (10m) 0.6551 0.0938

Zone-3 (80m) Zone-3 (10m) 0.5810 0.1173

Zone-4 (20m) Zone-4 (10m) 0.7767 0.0517

Zone-4 (40m) Zone-4 (10m) 0.6593 0.0703

Zone-4 (80m) Zone-4 (10m) 0.6083 0.0939

Zone-5 (20m) Zone-5 (10m) 0.7372 0.1008

Zone-5 (40m) Zone-5 (10m) 0.5726 0.1326

Zone-5 (80m) Zone-5 (10m) 0.4688 0.1495

Zone-6 (20m) Zone-6 (10m) 0.8293 0.0810

Zone-6 (40m) Zone-6 (10m) 0.7167 0.1164

Zone-6 (80m) Zone-6 (10m) 0.6221 0.1425

Zone-7 (20m) Zone-7 (10m) 0.6211 0.0430

Zone-7 (40m) Zone-7 (10m) 0.4110 0.0391

Zone-7 (80m) Zone-7 (10m) 0.1700 0.0617

Resolution

(m)

CPU Time

(sec) Active cell Total cell

Zone-1 20 8,572 (>2 hrs) 298,326 1,629,450

Zone-2 20 3,819 (>1 hrs) 78,115 252,510

Zone-3 20 13,773 (>3 hrs) 318,070 1,164,240

Zone-4 20 3,500 (1 hrs) 50,513 359,074

Zone-5 20 3,847 (>1 hrs) 89,762 423,508

Zone-6 20 6,688 (>1.5 hrs) 114,932 549,328

Zone-7 20 2,424 (>0.5 hrs) 58,843 94,240

Intel® Core™ i7-3770K CPU @ 3.50GHz

40m

20m

Part-1

Part-2 Part-3

Zone-1

Zone-2

Zone-3

Zone-4

Part-3

Part Full Simulated Area

Zone

20m

Zone-2

20m

40m

40m

40m

20m

Unit 1 Unit 2 Unit 3

MC+FSS with

Smart Partitioning

Multi-grid & domain decomposition

Zone Unit Compare with CPU Time

(sec)

Flood Area Corret

Coefficient

Flood Depth Error

(m)

Zone-3

Zone-3-1 (20m) Zone-3 (20m) 2,887 (<1hr) 0.9631 0.0173

Zone-3-2 (20m) Zone-3 (20m) 3,108 (<1hr) 0.9451 0.0166

Zone-3-3 (20m) Zone-3 (20m) 2,775 (<1hr) 0.9333 0.0202

Zone-3-4 (20m) Zone-3 (20m) 3,372 (<1hr) 0.9745 0.0226

Zone-3-5 (20m) Zone-3 (20m) 3,108 (<1hr) 0.9028 0.0322

Zone-3-6 (20m) Zone-3 (20m) 3,063 (<1hr) 0.8939 0.0284

Zone-3-7 (20m) Zone-3 (20m) 2,980 (<1hr) 0.9202 0.0207

Zone-3-8 (20m) Zone-3 (20m) 3,600 (1hr) 0.9488 0.0209

Zone-3-9 (20m) Zone-3 (20m) 2,813 (<1hr) 0.9532 0.0220

Zone-3-10 (20m) Zone-3 (20m) 3,015 (<1hr) 0.9273 0.0247

Zone-3-11 (20m) Zone-3 (20m) 2,596 (<1hr) 0.9408 0.0106

FEWS_TAIWAN CURRENT SYSTEM

SUMMARY

After Partitioning, Not so precise as 10m, but similar to 20m

Bottle neck reduced from

Part 3 9hrs

Part 3 Zone 3 3hrs

Part 3 Zone 3 Unit 8 1hrs