3D Modelling the Effects of Climate Change on the Coast of NSW

                                                                                                                                                                              

                                                                                                                                                                                 Ben Bartlett - October 2007

                          

                        Abstract                   Method                   Results               Conclusion                   Future Study                 Contact

                    Results

Using the procedures outlined in the Method section, three draped digital elevation models were generated using the ArcGIS software package. A series of six movie (.avi) files were then created, using ArcScene, with fly-through effects and, by transposing other TINs over them, the illusion of sea level rise was created. Each model is representative of a section of land covering parts of the Windang and Primbee suburbs of Wollongong.

                        Results of DEM Generation

                              ArcScene file: Area1.sxd

The file Area1.sxd contains a draped DEM of subject Area 1 which represents a section of land covering parts of the suburbs Windang and Primbee. The DEM is exhibited with x10 vertical exaggeration for visually appropriate viewing. This file also contains the following TINs that are representative of different sea level increments.

TIN

Height (m on AHD)

Water1_0

0

Water1_1

0.2

Water1_2

0.4

Water1_3

0.6

Water1_4

0.8

Water1_5

1.0

august1998march1978flood_1_0

1.54

august1998march1978flood_1_1

1.74

august1998march1978flood_1_2

1.94

august1998march1978flood_1_3

2.14

august1998march1978flood_1_4

2.34

august1998march1978flood_1_5

2.54

march1975feb1984flood_1_0

1.84

march1975feb1984flood_1_1

2.04

march1975feb1984flood_1_2

2.24

march1975feb1984flood_1_3

2.44

march1975feb1984flood_1_4

2.64

march1975feb1984flood_1_5

2.84

Table: Explanation of sea level TINs and their respective constant heights.

 

                    Figure: Draped DEM of Area 1 with x10 vertical exaggeration.

                    ArcScene file: Area2.sxd

The file Area2.sxd contains a draped DEM of subject Area 2 which represents a section of land covering parts of Windang. The DEM is exhibited with x10 vertical exaggeration for appropriate viewing. This file also contains the following TINs that are representative of different sea level increments.

TIN

Height (m AHD)

Water2_0

0

Water2_1

0.2

Water2_2

0.4

Water2_3

0.6

Water2_4

0.8

Water2_5

1.0

august1998march1978flood_2_0

1.54

august1998march1978flood_2_1

1.74

august1998march1978flood_2_2

1.94

august1998march1978flood_2_3

2.14

august1998march1978flood_2_4

2.34

august1998march1978flood_2_5

2.54

march1975feb1984flood_2_0

1.84

march1975feb1984flood_2_1

2.04

march1975feb1984flood_2_2

2.24

march1975feb1984flood_2_3

2.44

march1975feb1984flood_2_4

2.64

march1975feb1984flood_2_5

2.84

Table: Explanation of sea level TINs and their respective constant heights.

 

Figure: Draped DEM of Area 2 with x10 vertical exaggeration.

ArcScene file: Area3.sxd

The file Area3.sxd contains a draped DEM of subject Area 3 which represents a section of land covering parts of the suburb of Windang. The DEM is exhibited with x10 vertical exaggeration for appropriate viewing. This file also contains the following TINs that are representative of different sea level increments:

TIN

Height (m on AHD)

Water2_0

0

Water2_1

0.2

Water2_2

0.4

Water2_3

0.6

Water2_4

0.8

Water2_5

1.0

august1998march1978flood_2_0

1.54

august1998march1978flood_2_1

1.74

august1998march1978flood_2_2

1.94

august1998march1978flood_2_3

2.14

august1998march1978flood_2_4

2.34

august1998march1978flood_2_5

2.54

march1975feb1984flood_2_0

1.84

march1975feb1984flood_2_1

2.04

march1975feb1984flood_2_2

2.24

march1975feb1984flood_2_3

2.44

march1975feb1984flood_2_4

2.64

march1975feb1984flood_2_5

2.84

Table: Explanation of sea level TINs and their respective constant heights.

 

Figure: Draped DEM of Area 1 with x10 vertical exaggeration.

 

 

Results of Movie File (.avi) Generation

A total of six animations were created using ArcScene following the generation of DEMs and TINs in ArcMap and ArcScene. They represent rises in water level in selected areas of Windang and Primbee. Each file adheres to the following naming convention:

e.g. Area1_MF.avi

Area1 Area of land that is represented by draped DEM

MF Flood events which occurred in March 1975 and February 1984 which both reached a height of 1.85m AHD.

AM Flood events which occurred in August 1998 and March 1978 which both reached a height of height of 1.54m AHD.

 

The animations each depict a static rise in two sets of water levels on the parcel of land defined by its name. The first set of rising water levels, coloured dark blue, starts from 0m AHD and ascends by increments of 0.2m until it 1m AHD is reached. The second set of rising water levels, which appears immediately after the first set and is denoted by a different colour to dark blue, simulates the theoretical height of static water level if a flood event (defined by the file name) occurred at each of the first set of water levels. For example if the March 1975 and February 1984 flood event (height = 1.85m AHD) occurred when the water level has already risen 0.4m, then the water level would reach 2.25m.

Video file: Area1_MF.avi

The file Area1_MF.avi encompasses the draped DEM of Area 1 of the topic area and exhibits rises in water level as follows:

Rise starting from 0m AHD with ascending 0.2m increments. i.e. 0m, 0.2m, 0.4m, 0.6m 0.8m and 1.0m. This is represented in dark blue.

Rise from 1.84m AHD, as in flood events in March 1975 and February 1984, with ascending 0.2m increments. i.e. 1.84m, 2.04m, 2.24m, 2.44m, 2.64m, and 2.84m.

The flood event data is represented by a light blue background with dark blue spots (see table below).

Increment Number

Sea level

(m AHD)

Flood Event Height

(m AHD)

Total Sea Level

(m AHD)

Colour

1

0

-

0

Dark Blue

2

0.2

-

0.2

Dark Blue

3

0.4

-

0.4

Dark Blue

4

0.6

-

0.6

Dark Blue

5

0.8

-

0.8

Dark Blue

6

1.0

-

1.0

Dark Blue

7

0

1.84

1.84

Light Blue w/ Dark Blue Spots

8

0.2

1.84

2.04

Light Blue w/ Dark Blue Spots

9

0.4

1.84

2.24

Light Blue w/ Dark Blue Spots

10

0.6

1.84

2.44

Light Blue w/ Dark Blue Spots

11

0.8

1.84

2.64

Light Blue w/ Dark Blue Spots

12

1.0

1.84

2.84

Light Blue w/ Dark Blue Spots

Table: The sea level heights used in animation and their respective representative colours.

The video file also has a fly through camera effect which concentrates on key areas of inundation and gives a greater perspective of the broader extent of inundation.

Video file: Area1_AM.avi

The file Area1_AM.avi contains the draped DEM of Area 1 of the topic area and simulates rises in water level as follows:

Rise from 0m AHD with ascending 0.2m increments. i.e. 0m, 0.2m, 0.4m, 0.6m 0.8m and 1.0m. This is represented in blue.

Rise from 1.54m AHD as in flood events in August 1998 and March 1978 with ascending 0.2m increments. i.e. 1.54m, 1.74, 1.94m, 2.14m, 2.34m and 2.54m.

The flood event is represented by a dark blue background with white spots (see table below).

The video file also has a fly through camera effect which concentrates on key areas of inundation and also gives a greater perspective of the broader extent of inundation.

Increment Number

Water level (m AHD)

Flood Event    Height     

(m AHD)

Total Water Level

(m AHD)

Colour

1

0

-

0

Dark Blue

2

0.2

-

0.2

Dark Blue

3

0.4

-

0.4

Dark Blue

4

0.6

-

0.6

Dark Blue

5

0.8

-

0.8

Dark Blue

6

1.0

-

1.0

Dark Blue

7

0

1.54

1.54

Dark Blue w/ White Spots

8

0.2

1.54

1.74

Dark Blue w/ White Spots

9

0.4

1.54

1.94

Dark Blue w/ White Spots

10

0.6

1.54

2.14

Dark Blue w/ White Spots

11

0.8

1.54

2.34

Dark Blue w/ White Spots

12

1.0

1.54

2.54

Dark Blue w/ White Spots

Table: The sea level heights used in animation and their respective representative colours.

Video file: Area2_MF.avi

The file Area2_MF.avi exhibits the draped DEM of Area 2 and simulates rises in water level as follows:

Rise from 0m AHD with ascending 0.2m increments. i.e. 0m, 0.2m, 0.4m, 0.6m 0.8m and 1.0m. This is represented in blue.

Rise from 1.84m AHD as in flood events in March 1975 and February 1984 with ascending 0.2m increments. i.e. 1.84m, 2.04m, 2.24m, 2.44m, 2.64m and 2.84m.

The flood event data is represented by a light blue background with dark blue spots (see table below).

The video file also has a fly through camera effect which concentrates on key areas of inundation and also gives a greater perspective of the broader extent of inundation. In order to highlight key features in the area, 3D text labels have been generated and appear over the top of the feature.

Increment Number

Water level (m AHD)

Flood Event Height (m AHD)

Total Water Level (m AHD)

Colour

1

0

-

0

Dark Blue

2

0.2

-

0.2

Dark Blue

3

0.4

-

0.4

Dark Blue

4

0.6

-

0.6

Dark Blue

5

0.8

-

0.8

Dark Blue

6

1.0

-

1.0

Dark Blue

7

0

1.84

1.84

Light Blue w/ Dark Blue Spots

8

0.2

1.84

2.04

Light Blue w/ Dark Blue Spots

9

0.4

1.84

2.24

Light Blue w/ Dark Blue Spots

10

0.6

1.84

2.44

Light Blue w/ Dark Blue Spots

11

0.8

1.84

2.64

Light Blue w/ Dark Blue Spots

12

1.0

1.84

2.84

Light Blue w/ Dark Blue Spots

Table: The sea level heights used in animation and their respective representative colours.

Video file: Area2_AM.avi

The file Area2_AM.avi exhibits the draped DEM of Area 2 of the topic area and shows rises in water level as follows:

Rise from 0m AHD with ascending 0.2m increments. i.e. 0m, 0.2m, 0.4m, 0.6m 0.8m and 1.0m. This is represented in blue.

Rise from 1.54m AHD as in flood events in August 1998 and March 1978 with ascending 0.2m increments. i.e. 1.54m, 1.74, 1.94m, 2.14m, 2.34m, and 2.54m.

The flood event is represented by a dark blue background with white spots (see table below).

The video file also has a fly through camera effect which concentrates on key areas of inundation and also gives a greater perspective of the broader extent of inundation. In order to highlight key features in the area, 3D text labels have been generated and appear over the top of the feature.

Increment Number

Water level (m AHD)

Flood Event Height      (m AHD)

Total Water Level

(m AHD)

Colour

1

0

-

0

Dark Blue

2

0.2

-

0.2

Dark Blue

3

0.4

-

0.4

Dark Blue

4

0.6

-

0.6

Dark Blue

5

0.8

-

0.8

Dark Blue

6

1.0

-

1.0

Dark Blue

7

0

1.54

1.54

Dark Blue w/ White Spots

8

0.2

1.54

1.74

Dark Blue w/ White Spots

9

0.4

1.54

1.94

Dark Blue w/ White Spots

10

0.6

1.54

2.14

Dark Blue w/ White Spots

11

0.8

1.54

2.34

Dark Blue w/ White Spots

12

1.0

1.54

2.54

Dark Blue w/ White Spots

Table: The sea level heights used in animation and their respective representative colours.

 

Video file: Area3_MF.avi

The file Area3_MF.avi contains the draped DEM of Area 3 and rises in water level as follows:

Rise from 0m AHD with ascending 0.2m increments. i.e. 0m, 0.2m, 0.4m, 0.6m 0.8m and 1.0m. This is represented in blue.

Rise from 1.84m AHD as in flood events in March 1975 and February 1984 with ascending 0.2m increments. i.e. 1.84m, 2.04m, 2.24m, 2.44m, 2.64m and 2.84m.

The flood event data is represented by a light blue background with dark blue spots (see table below).

The video file also has a fly through camera effect which concentrates on key areas of inundation and also gives a greater perspective of the broader extent of inundation.

Increment Number

Water level (m AHD)

Flood Event Height (m AHD)

Total Water Level (m AHD)

Colour

1

0

-

0

Dark Blue

2

0.2

-

0.2

Dark Blue

3

0.4

-

0.4

Dark Blue

4

0.6

-

0.6

Dark Blue

5

0.8

-

0.8

Dark Blue

6

1.0

-

1.0

Dark Blue

7

0

1.84

1.84

Light Blue w/ Dark Blue Spots

8

0.2

1.84

2.04

Light Blue w/ Dark Blue Spots

9

0.4

1.84

2.24

Light Blue w/ Dark Blue Spots

10

0.6

1.84

2.44

Light Blue w/ Dark Blue Spots

11

0.8

1.84

2.64

Light Blue w/ Dark Blue Spots

12

1.0

1.84

2.84

Light Blue w/ Dark Blue Spots

Table: The sea level heights used in animation and their respective representative colours.

Video file: Area3_AM.avi

The file Area3_AM.avi demonstrates the draped DEM of Area 3 and rises in water level as follows:

Rise from 0m AHD with ascending 0.2m increments. i.e. 0m, 0.2m, 0.4m, 0.6m 0.8m and 1.0m. This is represented in blue.

Rise from 1.54m AHD as in flood events in August 1998 and March 1978 with ascending 0.2m increments. i.e. 1.54m, 1.74, 1.94m, 2.14m, 2.34m and 2.54m.

The flood event is represented by a dark blue background with white spots (see table below).

The video file also has a fly through camera effect which exhibits a variety of perspectives over the area for the viewer to gain a greater understanding of the topography.

Increment Number

Water level (m AHD)

Flood Event Height (m AHD)

Total Water Level (m AHD)

Colour

1

0

-

0

Dark Blue

2

0.2

-

0.2

Dark Blue

3

0.4

-

0.4

Dark Blue

4

0.6

-

0.6

Dark Blue

5

0.8

-

0.8

Dark Blue

6

1.0

-

1.0

Dark Blue

7

0

1.54

1.54

Dark Blue w/ White Spots

8

0.2

1.54

1.74

Dark Blue w/ White Spots

9

0.4

1.54

1.94

Dark Blue w/ White Spots

10

0.6

1.54

2.14

Dark Blue w/ White Spots

11

0.8

1.54

2.34

Dark Blue w/ White Spots

12

1.0

1.54

2.54

Dark Blue w/ White Spots

Table: The sea level heights used in animation and their respective representative colours.

 

                        Back to top