Extraction and Spatiotemporal Evolution Analysis of Impervious Surface and Surface Runoff in Main Urban Region of Hefei City, China

Gang Fang, Han Li (), Jie Dong, Hanyang Teng, Renato Dan A. Pablo () and Yin Zhu
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Gang Fang: School of Environment and Surveying Engineering, Suzhou University, Suzhou 234000, China
Han Li: School of Environment and Surveying Engineering, Suzhou University, Suzhou 234000, China
Jie Dong: School of Environment and Surveying Engineering, Suzhou University, Suzhou 234000, China
Hanyang Teng: School of Environment and Surveying Engineering, Suzhou University, Suzhou 234000, China
Renato Dan A. Pablo: Graduate School, Angeles University Foundation, Angeles 2009, Philippines
Yin Zhu: School of Environment and Surveying Engineering, Suzhou University, Suzhou 234000, China

Sustainability, 2023, vol. 15, issue 13, 1-17

Abstract: The biophysical composition index (BCI)-based linear spectral mixture model (LSMM) is used in this study to extract the impervious surface (IS), vegetation, and soil coverage of the main urban region (MUR) of Hefei City over the 2001–2021 period. In addition, the Soil Conservation Service-Curve Number (SCS-CN) model is first applied to simulate the surface runoff (SR) in the MUR of Hefei City over the past 21 years, then assessed for simulation accuracy using typical waterlogging points in the study area. On this basis, the spatiotemporal evolution of IS and SR and their relationships in the MUR of Hefei City are investigated and discussed in this study. The obtained results showed that (1) the root-mean-square error (RMSE), mean absolute error (MAE), and systematic error (SE) values of the BCI index-based LSMM are smaller than those of the LSMM, demonstrating a higher extraction accuracy of urban IS extraction of the BCI index-based LSMM. (2) The IS area of the MUR of Hefei City exhibits an increasing trend from 107.555 km 2 in 2001 to 387.660 km 2 in 2021. In addition, the change rate and change intensity values indicate an increasing–decreasing–increasing trend. The highest change rate and change intensity values are 24.839 km 2 /year and 23.094%, respectively, and were observed in the 2001–2005 period. (3) The simulated SR (165–195 mm) in the MUR of Hefei City demonstrates an increasing trend in the 2001–2021 period at a rainfall intensity value of 200 mm/d. In addition, the simulated SR amount in the central area exhibits slight changes, while that in the surrounding areas shows substantial variations. (4) The distribution of IS and SR in the MUR of Hefei City reveals strong directional variations, which are all affected by geographical conditions. The IS coverage and SR show high positive correlation coefficients in different years. (5) The present study provides primary data for effective urban planning, water resources management and regulation, and disaster prevention and mitigation in Hefei City, as well as a scientific reference for future studies on urban IS, SR, and their quantitative relationships in other regions.

Keywords: BCI index; linear spectral mixture model; impervious surface; SCS-CN model; surface runoff; spatiotemporal evolution; the main urban region of Hefei City (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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