Risk Assessment of Urban Floods Based on a SWMM-MIKE21-Coupled Model Using GF-2 Data

Abstract

Global climate change and rapid urbanization have caused increases in urban floods. Urban flood risk assessment is a vital method for preventing and controlling such disasters. This paper takes the central region of Cangzhou city in Hebei Province as an example. Detailed topographical information, such as the buildings and roads in the study area, was extracted from GF-2 data. By coupling the two models, the SWMM and MIKE21, the spatial distribution of the inundation region, and the water depth in the study area under different return periods, were simulated in detail. The results showed that, for the different return periods, the inundation region was generally consistent. However, there was a large increase in the mean inundation depth within a 10-to-30-year return period, and the increase in the maximum inundation depth and inundation area remained steady. The comprehensive runoff coefficient in all of the scenarios exceeded 0.8, indicating that the drainage system in the study area is insufficient and has a higher flood risk. The flood risk of the study area was evaluated based on the damage curve, which was obtained from field investigations. The results demonstrate that the loss per unit area was less than CNY 250/m2 in each return period in the majority of the damaged areas. Additionally, the total loss was mainly influenced by the damaged area, but, in commercial areas, the total loss was highly sensitive to the inundation depth.

Effects of Low-Impact Development Facilities (Water Systems of the Park) on Stormwater Runoff in Shallow Mountainous Areas Based on Dual-Model (SWMM and MIKE21) Simulations

“…This is consistent with previous studies that have found that increasing the size of LID facilities can reduce peak runoff flows [ 54 ]. Wang [ 55 ] and Zhao [ 56 ] et al found that the maximum flow rates in most urban areas were small. The possibility of flow velocity loss before and after construction is small.…”

Application of GIS and SWMM model to assess urban flooding in Metro Residential Area of Ninh Kieu District

“…To create a basis for mitigating the negative impacts of flooding in Metro Residential Area, this research is conducted to apply GIS and SWMM model to assess urban flooding in this residential area. The application of SWMM model in urban flooding research has been IOP Publishing doi:10.1088/1755-1315/1170/1/012007 2 used in many areas around the world and has yielded many practical results, providing good support for urban drainage management [3][4][5]. In Vietnam, the use of SWMM model to assess urban flooding is also quite popular in many localities in the current period [6][7][8].…”

Dynamic and loss analysis of flood inundation in the floodplain area of the lower Yellow River considering ecological impact

“…Chinh et al [22] used multivariate statistical analysis to analyse the flood loss of residential buildings in Cantor city in the Mekong Delta. Zhao et al [23] used the coupling of the SWMM and MIKE 21 model to analyse the flood inundation loss in the central area of Cangzhou, Hebei. Guo et al [24] created a flood risk assessment model of flood storage and detention area based on a mechanical process to quantitatively evaluate the flood risk level of flood storage and detention area during the commissioning of flood diversion and storage project.…”