Presentation by Che-Hao Chang (National Taipei University of Technology (NTUT), Taiwan) and Jhih-Cyuan Shen (FondUS Technology Co., Ltd., Taiwan) at the Delft3D User Days, during the Delft Software Days - Edition 2023 (DSD-INT 2023). Monday, 13 November 2023, Delft.

1. Next-Generation Flood Inundation
Mapping for Taiwan: Delft3D FM 1D2D in Action
Jhih Cyuan Shen
FondUS.inc
Che-Hao Chang
National Taipei University of Technology
2023-11-13

2. 2
4 Project Results Data
Outline
Map, data, model
2 SOBEK VS Delft3D FM 1D2D
Differences in model Usage
Flood Inundation Map
1
Technical and Data
3 Training Course, Stage Review, Project Scheduled
Project Implementation Approach

3. 3
Flood Inundation Map
1
Technical and Data

4. Flood Inundation Mapping History
1st 2nd 3rd 4th
Year 1999-2001 2007-2009 2014-2016 2024~2026
Resolution 200*200*1 40*40*0.1 40*40*0.1 5*5*0.1
DEM 1:5000 Basic
Photo Map
2008 DEM 2014-2016 DEM HyDEM
Model Academic Model Academic
Model
SOBEK
SOBEK Delft3D FM 1D2D
Hydraulic Overland Flow Channl+
Overland Flow
Channl+
Overland
Flow+Drainage
Overland
Flow+Drainage
Hydraulic Structure
4

5. 5
River Flooding Urban Flooding
3th
(River Flooding、40m )
Rainfall Runoff
Hydraulic
catchment
River Flooding
4th
(Urban Flooding 、5m)
Rainfall Runoff
Hydraulic
Surface Runoff
Grid rainfall
Urban Flooding
Extreme Rainfall

6. Model setting
Grid : 40m
Some area :10m o20m
Protected Area /5~10m
Unprotected Area/ No Limitations
Regular Grid Regular Grid and Flexible Mesh
Not Considering Building Effects Considering Building Effects
Branch 1d(Cross-Section) 2D DEM with bank line
1D Hydraulic Structures
Boundary at the River Mouth
Rainfall use gauge point
Rainfall timestep 1hr
Simulation output /1hr
Simulation output /water depth
1D Hydraulic Structures
Boundary at the Maritime Boundary
Rainfall use grid
Rainfall timestep 1hr
Simulation output /10 min
Simulation output /water depth ,water level
3th 4th

7. 7
Rainfall Runoff
3rd 4th
Quantitative
Rainfall
Return Period
Rainfall
27 27
32 16
59 43
The same
Exclude
6 Hours and 12 Hours
different
Rainfall Scenario

8. 8
Uniform Rainfall Across the Area
Base on gauge Base on Rainfall grid
Reference Thiessen's Polygon
Define parameters
for each catchment
Catchment Surface Runoff
without catchment
Rainfall Runoff Rainfall Scenario
3rd 4th
Quantitative
Rainfall
Return Period
Rainfall

9. 9
Geographical Data DEM
Data source
Lidar Lidar
(DEM) (HyDEM)
Characteristics Mountainous Tomograph
Less Emphasis on Detailed Plains
Detailed Plains
Hydraulic Structure
Landscape Details
Other nan Add 3D Building polygon
3rd 4th

10. 10
Hydraulic Digital Elevation Data(HyDEM)
Geographical Data
Profile
Thin Embankment

11. 11
Hydraulic Digital Elevation Data(HyDEM)
Geographical Data
HyDEM LAS
HyDEM
3D Hydraulic
Feature
Waterbody polygon, Bank Line, 3D Building
Polygon, Sea dike Line, Maritime Boundary
line(with Elevation Information)
From HyDEM LAS Resolution 1
meter
Point cloud modify and Annotation
Categories with Hydraulic Feature
Collaborating between the Cartography and the Application.

12. 12
3D Building Polygon
Waterbody
polygon
Bank Line

13. 13
Maritime Boundary line Sea dike Line
Hydraulic Digital Elevation Data(HyDEM)
Geographical Data

14. 14
Model Setting Rule
3rd 4th
Flow Direction
Geographical Data
1D 1D+2D
Cross-Section
Gate
Bank line

15. 15
2 SOBEK VS Delft3D FM 1D2D
Differences in model Usage

16. 16
Single-Core Computation
Single Grid Type
Multi-Core Computation
Multiple Grid Types
Runoff Routing to 1D + 1D2D Direct Rainfall to Surface Runoff + 1D2D
SOBEK VS Delft3D FM 1D2D

17. 17
Delft3D FM Suite 1D2D
D-Flow FM
D-Real Time Control
D-Hydrology
Seamless
Integration
Comprehensive
Features
Convenient
Analysis
(SOBEK data)
(2D object)
( enclosure )

18. 18
1D 2D RR
1.Sewer
2.Weir
3.Pump
4.Gate
5.Culvert
6.Cross-Section
7.Branch
8.Bridge
9.Observation point
1.Dry point
2.Dry area
3.Roof area
4.Weir
5.Dam
6.Embankment
7.Observation point
8.enclosure

19. Different Types of Grids
19
40M
10M
10M+1M

20. Different Types of Grids

21. 21
SOBEK object to Delft3D FM 1D2D
Seamless
Integration

22. 22
2D object
Roof area and dry area
Comprehensive
Features

23. 23
Hydraulic Structures
PUMP
Pump Direction
1D pump
2D pump
1D pump 2D pump
Comprehensive
Features

24. 24
Hydraulic Structures
before after
before
after
Bank line
Bank Line with Elevation Information
Comprehensive
Features

25. 25
GIS and WMS layer
Convenient
Analysis

26. 26
flood sensor data check
Observation point
Convenient
Analysis

27. 27
3 Training Course , Stage Review, Project Scheduled
Project Implementation Approach

28. 28
Training Course
1st 04/28、05/05、05/19
Government Agencies
WRA
(1,2,3,4,5,6,8,9 RMB)
Taipei City
New Taipei City
Tainan City
Yilan County
Yunlin County
Academic Institutions
NTU NCKU
NCU NCHU
NTOU TKU
FCU
Corporate
NCDR , AERC
Taiwan Hydraulic Engineer Association
Engineering Consulting
中興、以樂、巨廷、禾騰、兆豐、多采
艾奕康、佺葉、怡興、美華環境、容泰
桔源、連生、創聚、爾灣、黎明、鴻威
鴻森
2nd 8/4, 8/11,8/25
29+84 34

29. Training Course
• Online and On-Site Courses
29

30. 30
04/28
05/05
05/19

31. Instructional Videos
https://www.youtube.com/playlist?list=PLrW_x3M_tnkXjk
TBJV00xrT__JTDwvIsg
Modeling Steps by Steps Tutorial

32. Course Recordings
1st 2nd

33. Tips of the Delft3D FM 1D2D
33

34. 34
Stage Review and Confirmation of Results
With Data Validation Program

35. 35
Project Scheduled
2024 2025 2026
Kaohsiung City Taipei City
New Taipei City (Keelung City)
Taoyuan City
Taichung City
Changhua County
Nantou County
Hualien County
Taitung County
Yilan County
Hsinchu County and City
Miaoli County
Yunlin County
Chiayi County and City
Tainan City
Pingtung County

36. 36
4 Project Results Data
Map, data, model

37. 37
4th
3rd
Create in A0 Size, Output in A3 Size
Map layout

38. 38
Map layout
Open source : QGIS Layout

39. Feature Task Requirements
39
• For the project
– More documentation and Tutorial Course data
– Data and Model : Validation and Verification
• For the model
– HydroMT Delft3D FM
– Grid precipitation data import
– MESH editing and modify
– Parallel computing

40. Share and Cooperation
40
Thank you for your
patience.
coop.shen@gmail.com
https://twitter.com/JhihCyuan
https://www.facebook.com/coop.shen