An Alternative Risk Assessment Model of Urban Waterlogging: A Case Study of Ningbo City
Abstract
:1. Introduction
2. Literature Review
2.1. Urban Waterlogging
2.2. Risk Assessment of Urban Waterlogging
2.2.1. Formation Mechanism of Natural Disaster Risk
2.2.2. Waterlogging Risk Assessment Model
3. Methodology
3.1. Research Area
3.2. Data Collection
3.3. Data Processing
3.4. Risk Indicator Weight
3.5. Risk Assessment Model
4. Results
4.1. Urban Waterlogging Risk Assessment Model
4.2. Risk Assessment Based on the Risk Assessment Model
4.2.1. Calculation of Risk Indicator Weight
4.2.2. Waterlogging Risk Assessment in the City Proper of Ningbo
- Waterlogging Dangerousness Assessment
- 2.
- Waterlogging Sensitivity Assessment
- 3.
- Waterlogging Vulnerability Assessment
- 4.
- Comprehensive Waterlogging Risk Assessment in the City Proper of Ningbo
4.2.3. Verification
5. Discussion
- (1)
- By considering the small watershed as the research unit, this study conducted the risk assessment of city proper of Ningbo with different grades of waterlogging by combining with the SCS-CN model and superimposing the risk assessment map. The results show that the low-risk areas were mainly located in Jiangbei district, and the high-risk areas were mainly located in the middle of Jiangdong district and the southern part of Haishu district. The dangerousness for waterlogging factors in the city proper was mainly low.
- (2)
- On the basis of the weight coefficients, this study superimposed the secondary index layer of disaster-prone environment sensitivity to obtain the assessment map of disaster-prone environment sensitivity in the city proper of Ningbo. The results show that the areas with low sensitivity were mainly located in the northern part of Jiangbei district, and the areas with medium-high sensitivity were located in the southern part of the city proper. The distribution of the highly sensitive area was largely affected by the river networks because the type of land cover affects the distribution pattern of urban waterlogging sensitivity.
- (3)
- On the basis of the weight coefficients, this study obtained the assessment map of waterlogging vulnerability in the city proper of Ningbo by overlaying the population density and road density layers. The results showed that the areas with low vulnerability were mainly located in Jiangbei district; the areas with high vulnerability were mainly located at the intersection of three rivers, namely, Jiangdong district, Haishu district, and Jiangbei district; and small parts of this area was located in Wangchun street, Haishu district.
- (4)
- On the basis of the weight coefficients, this study obtained the waterlogging risk assessment map in the city proper of Ningbo by overlaying three first-level index layers. The results showed that the low-risk area was mainly located in the northern part of Jiangbei district, the higher-risk area was mainly located in Haishu district, with small parts located in the middle of Jiangbei district, and the high-risk areas were mainly concentrated in the west of Jiangdong district and the middle of Haishu district. In general, the eastern part of Jiangdong district and Haishu district of Ningbo were areas with a high incidence of waterlogging.
6. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
Abbreviations
ILLUDAS | Illinois Urban Drainage Area Simulator |
SRM | Snowmelt–Runoff Model |
SWMM | Storm Water Management Model |
GDP | Gross Domestic Product |
DEM | Digital Elevation Model |
SCS-CN | Soil Conservation Service Curve Number |
AHP | Analytic Hierarchy Process |
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Data Category | Data | Sources |
---|---|---|
Geospatial data | DEM (Digital Elevation Model) data in the city proper (2 × 2 m) | Surveying and Mapping Institute of Ningbo |
Soil classification map of Ningbo (1:1 million) | Institute of Soil Science, Chinese Academy of Sciences | |
Remote sensing images in the city proper in 2016 (0.5 × 0.5 m) | Bureau of Land and Resources of Ningbo | |
The type of land use in 2016 (1:10,000) | Bureau of Land and Resources of Ningbo | |
Drainage pump station of main rivers in the city proper | Field investigation | |
Boundary of the administrative district in the city proper | The research group | |
Water accumulation points in the city proper in 2016 | News reports and field investigation | |
Road distribution of Ningbo (county level) | Electronic Map of Ningbo (2015) | |
Socioeconomic data | Population information of each street in the city proper in 2016 | 2017 Ningbo Statistical Yearbook |
Soil property classification | Zhejiang Soil History |
Basin Number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | |
Depth of Stagnant Water | ||||||||||
0.1 m | 16.2 | 5.6 | 9.95 | 5.37 | 16.01 | 10.62 | 10.51 | 10.85 | 6.65 | |
0.2 m | 25.5 | 14.65 | 14.95 | 10.1 | 21.08 | 17.6 | 13.53 | 16.1 | 8.46 | |
0.6 m | 114.1 | 50.14 | 40.86 | 30 | 54.9 | 54.78 | 30.38 | 53.67 | 58.35 | |
1 m | 189 | 148.22 | 74.11 | 45.51 | 91.96 | 73.07 | 92.9 | 96.19 | 198.12 | |
Basin Number | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 10 | |
Depth of Stagnant Water | ||||||||||
0.1 m | 10.63 | 9.28 | 11.62 | 37.16 | 10.83 | 8.76 | 25.24 | 8.27 | 10.63 | |
0.2 m | 14.7 | 12.74 | 14.14 | 66.45 | 14.71 | 14.7 | 37 | 10.71 | 14.7 | |
0.6 m | 42.59 | 39.01 | 38.17 | 160 | 33 | 51 | 95.06 | 23.68 | 42.59 | |
1 m | 95.19 | 58 | 138.78 | 198 | 40.59 | 104.95 | 159.2 | 38.39 | 95.19 |
Target Layer | Criterion Layer | Indicator Layer | Scheme Layer |
---|---|---|---|
Waterlogging risk assessment | Dangerousness | Precipitation | Catastrophic rainfall threshold |
Sensitivity | Terrain | Terrain relief | |
Water system | River buffer | ||
Drainage capacity | Pump station flow | ||
Surface features | Land use type | ||
Vulnerability | Population | Population density | |
Road | Road density |
Indicator Type | Weight | Indicator Layer | Weight |
---|---|---|---|
Dangerousness | 0.5 | Catastrophic rainfall threshold | 0.5 |
Sensitivity | 0.25 | Land use type | 0.0325 |
Terrain relief | 0.0975 | ||
Pump station flow | 0.0475 | ||
River buffer | 0.0725 | ||
Vulnerability | 0.25 | Population density | 0.1675 |
Road density | 0.0825 |
Rainfall Classification | Light Waterlogging | Moderate Waterlogging | Heavy Waterlogging |
---|---|---|---|
(5.73, 10.1) | 5 | — | — |
(10.1, 26.38) | 4 | 5 | — |
(26.38, 38.89) | 3 | 4 | 5 |
(38.89, 189) | 2 | 3 | 4 |
(189, ~) | 1 | 2 | 3 |
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Zhou, M.; Feng, X.; Liu, K.; Zhang, C.; Xie, L.; Wu, X. An Alternative Risk Assessment Model of Urban Waterlogging: A Case Study of Ningbo City. Sustainability 2021, 13, 826. https://doi.org/10.3390/su13020826
Zhou M, Feng X, Liu K, Zhang C, Xie L, Wu X. An Alternative Risk Assessment Model of Urban Waterlogging: A Case Study of Ningbo City. Sustainability. 2021; 13(2):826. https://doi.org/10.3390/su13020826
Chicago/Turabian StyleZhou, Meiling, Xiuli Feng, Kaikai Liu, Chi Zhang, Lijian Xie, and Xiaohe Wu. 2021. "An Alternative Risk Assessment Model of Urban Waterlogging: A Case Study of Ningbo City" Sustainability 13, no. 2: 826. https://doi.org/10.3390/su13020826