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Article

Spatial Heterogeneity Analysis of Short-Duration Extreme Rainfall Events in Megacities in China

1
Department of Hydraulic Engineering, Tongji University, Shanghai 200092, China
2
Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3364; https://doi.org/10.3390/w12123364
Received: 31 October 2020 / Revised: 27 November 2020 / Accepted: 28 November 2020 / Published: 30 November 2020
(This article belongs to the Special Issue Statistical Approach to Hydrological Analysis)
Given the fact that researchers require more specific spatial rainfall information for storm flood calculation, hydrological risk assessment, and water budget estimates, there is a growing need to analyze the spatial heterogeneity of rainfall accurately. This paper provides insight into rainfall spatial heterogeneity in urban areas based on statistical analysis methods. An ensemble of short-duration (3-h) extreme rainfall events for four megacities in China are extracted from a high-resolution gridded rainfall dataset (resolution of 30 min in time, 0.1° × 0.1° in space). Under the heterogeneity framework using Moran’s I, LISA (Local Indicators of Spatial Association), and semi-variance, the multi-scale spatial variability of extreme rainfall is identified and assessed in Shanghai (SH), Beijing (BJ), Guangzhou (GZ), and Shenzhen (SZ). The results show that there is a pronounced spatial heterogeneity of short-duration extreme rainfall in the four cities. Heterogeneous characteristics of rainfall within location, range, and directions are closely linked to the different urban growth in four cities. The results also suggest that the spatial distribution of rainfall cannot be neglected in the design storm in urban areas. This paper constitutes a useful contribution to quantifying the degree of spatial heterogeneity and supports an improved understanding of rainfall/flood frequency analysis in megacities. View Full-Text
Keywords: extreme rainfall; short duration; spatial heterogeneity; megacities extreme rainfall; short duration; spatial heterogeneity; megacities
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MDPI and ACS Style

Zhuang, Q.; Liu, S.; Zhou, Z. Spatial Heterogeneity Analysis of Short-Duration Extreme Rainfall Events in Megacities in China. Water 2020, 12, 3364. https://doi.org/10.3390/w12123364

AMA Style

Zhuang Q, Liu S, Zhou Z. Spatial Heterogeneity Analysis of Short-Duration Extreme Rainfall Events in Megacities in China. Water. 2020; 12(12):3364. https://doi.org/10.3390/w12123364

Chicago/Turabian Style

Zhuang, Qi, Shuguang Liu, and Zhengzheng Zhou. 2020. "Spatial Heterogeneity Analysis of Short-Duration Extreme Rainfall Events in Megacities in China" Water 12, no. 12: 3364. https://doi.org/10.3390/w12123364

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