Effect of Independent Variables on Urban Flood Models
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area
2.2. Methods
2.2.1. Accuracy Evaluation
2.2.2. Hydraulic Model
3. Model Verification
4. Results and Discussion
4.1. Terrain Resolution Simulation Analysis
4.2. Artifical Land Cover Simulation Analysis
4.3. Comparative Analysis of All Simulation Schemes
5. Conclusions
- (1)
- The 35 m terrain resolution presented good accuracy in terms of the distribution of inundation area and flood evolution. Compared with the 70 m resolution, the error obtained for total inundation area was reduced by about 30% when using the 35 m resolution.
- (2)
- In terms of representation methods of artificial land cover, the urban flood model using the BB method could better reflect the actual flood evolution than that using the RD method. Compared with the RD method, the correlation (R2) of the maximum inundation depth increased by about 30% when using the BB method.
- (3)
- The effect of terrain resolution on simulation accuracy was more obvious than that of artificial land cover. In the models using the BB + RD method, values of RAA and RDA could reach above 80% for the 35 m resolution models (20–30% higher than the 70 m terrain resolution models). In the models using the 17 m terrain resolution, values of RAA and RDA could reach above 94% when considering only the effect of buildings (5% higher than models only considering the effect of roads).
Author Contributions
Funding
Conflicts of Interest
References
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Case Number | Terrain Resolution | Representation Method | Rainfall Intensity Return Periods | |
---|---|---|---|---|
Reference Cases | C1 | 17 m | BB + RD | 10 years |
C2 | 17 m | BB + RD | 2 years | |
Contrast Cases | C3 | 35 m | BB + RD | 10 years |
C4 | 70 m | |||
C5 | 35 m | BB + RD | 2 years | |
C6 | 70 m | |||
C7 | 17 m | RD | 10 years | |
C8 | BB | |||
C9 | 17 m | RD | 2 years | |
C10 | BB |
Simulation | Categories | |
---|---|---|
Inundation Depth (h) | Inundation Area (S) | |
Reference case (RC) | ||
Contrast case (CC) |
No. | Inundation Positions |
---|---|
1 | Mengdu street |
2 | South of Aoti new city tunnel, Yangzi river avenue |
3 | Fuchunjiang west street Nanxijiang street |
4 | Bailongjiang street |
5 | Jinshajiang street |
6 | Taishan Road |
7 | Xinglong street |
8 | Jiqingmen street to Changhong road from west to east |
9 | Yikang street to Lushan road |
10 | Hengshan road |
11 | Songshan road |
12 | Fuchunjiang street |
13 | Xin’anjiang street |
14 | Mudanjiang street |
15 | Shazhou police station |
Rainfall Return Periods | Indicator | 70 m | 35 m | 17 m | 17 m |
---|---|---|---|---|---|
BB + RD Method | BB + RD Method | RD Method | BB Method | ||
2 years | RDA | 0.9896 | 0.9942 | 0.8978 | 0.9405 |
RAA | 0.7623 | 0.9080 | 0.9538 | 0.9880 | |
10 years | RDA | 0.4905 | 0.8005 | 0.9266 | 0.9700 |
RAA | 0.5669 | 0.8632 | 0.9449 | 0.9926 |
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Geng, Y.; Zhu, B.; Zheng, X. Effect of Independent Variables on Urban Flood Models. Water 2020, 12, 3442. https://doi.org/10.3390/w12123442
Geng Y, Zhu B, Zheng X. Effect of Independent Variables on Urban Flood Models. Water. 2020; 12(12):3442. https://doi.org/10.3390/w12123442
Chicago/Turabian StyleGeng, Yanfen, Baohang Zhu, and Xin Zheng. 2020. "Effect of Independent Variables on Urban Flood Models" Water 12, no. 12: 3442. https://doi.org/10.3390/w12123442