“The 20 July 2021 Major Flood Event” in Greater Zhengzhou, China: A Case Study of Flooding Severity and Landscape Characteristics
Reads0
Chats0
TLDR
In this article , a comprehensive study of the Jialu system in Greater Zhengzhou was conducted to systematically compare how far the river water had reached before and after the 20 July 2021 major storm in order to identify the main weak links in the city's GI and stormwater management system.Abstract:
Climate change and rapid urbanization are two global processes that have significantly aggravated natural disasters, such as drought and flooding. Urbanization without resilient and sustainable planning and execution could lead to undesirable changes in landscapes and stormwater regulation capacity. These changes have exacerbated the effects of extreme climatic events with disastrous consequences in many cities worldwide. Unfortunately, the major storm in Zhengzhou, China on 20 July 2021 was one of these examples. This event provided a rare opportunity to study the key roles of green infrastructures (GI) in mitigating flooding risks in a major urban center after a devasting flood event. Using the data from high-resolution images collected via two satellites, a comprehensive study of the Jialu System in Greater Zhengzhou was conducted to systematically compare how far the river water had reached before and after the 20 July 2021 major storm in order to identify the main weak links in the city’s GI and stormwater management system. A flood inundation intensity index (FI) in the Upper (UJLR), Middle (MJLR), and Lower (LJLR) Regions of the Jialu River System was generated. Bivariate Moran’s I, a correlation coefficient between FI and landscape characteristics, was calculated and used to identify problem areas for future improvements. Our results showed that the MJLR had the severest flooding impacts. LJLR had the biggest change in how far the river water reached after flooding, ranging from 4.59 m to 706.28 m. In UJLR, the percentages of mine, crop land, and green space had the highest global bivariate Moran’s I correlation coefficients. In MJLR, the percentages of vacant land, impervious surfaces, and water body had the highest global bivariate Moran’s I correlation coefficients. In LJLR, the percentages of vacant land, water body, and crop land had the highest global bivariate Moran’s I correlation coefficients. The total percentages of both high landscape characteristics indices-high flood inundation intensity indices and low landscape characteristics indices-high flood inundation intensity indices areas are 12.96%, 13.47%, and 13.80% in UJLR, MJLR, and LJLR, respectively. These land cover composition types identified for each region can be treated as areas of primary focus. However, GeoDector Model (GDM) analyses showed that our eight variables of landscape characteristics were not independent. Hence, a more comprehensive approach integrating all eight variables is still necessary in future flood mitigation efforts.read more
Citations
More filters
Journal ArticleDOI
Coordinated Development of Farmland Transfer and Labor Migration in China: Spatio-Temporal Evolution and Driving Factors
TL;DR: Wang et al. as mentioned in this paper used socioeconomic data from 30 provinces/autonomous regions/municipalities in China to measure the coupling coordination degree (CCD) of farmland transfer (FT) and labor migration (LM) to facilitate the development of rural economy and implement the rural revitalization strategy.
Journal ArticleDOI
Urban waterlogging prediction and risk analysis based on rainfall time series features: A case study of Shenzhen
TL;DR: In this article , a novel waterlogging depth prediction model that applies only rainfall data as input is proposed by machine learning algorithms, which can achieve more accurate short-term water logging prediction.
Journal ArticleDOI
Modeling Multi-Objective Optimization with Updating Information on Humanitarian Response to Flood Disasters
Xue Hong Ji,Shaochuan Fu +1 more
TL;DR: In this paper , a multi-stage stochastic programming model with updating information is constructed, which considers the uncertainty of supply and demand, road network, and multiple types of emergency reliefs and vehicles.
References
More filters
Journal ArticleDOI
Local Indicators of Spatial Association—LISA
TL;DR: In this paper, a new general class of local indicators of spatial association (LISA) is proposed, which allow for the decomposition of global indicators, such as Moran's I, into the contribution of each observation.
Journal ArticleDOI
Geographical Detectors-Based Health Risk Assessment and its Application in the Neural Tube Defects Study of the Heshun Region, China
TL;DR: In a real‐world study, the primary physical environment was found to strongly control the neural tube defects (NTD) occurrences in the Heshun region (China) and basic nutrition was finding to be more important than man‐made pollution in the control of the spatial NTD pattern.
Journal ArticleDOI
Flood risk and climate change: global and regional perspectives
Zbigniew W. Kundzewicz,Shinjiro Kanae,Sonia I. Seneviratne,John Handmer,Neville Nicholls,Pascal Peduzzi,Reinhard Mechler,Laurens M. Bouwer,Nigel W. Arnell,Katherine J Mach,Robert Muir-Wood,R. Brakenridge,Wolfgang Kron,Gerardo Benito,Yasushi Honda,Kiyoshi Takahashi,Boris Sherstyukov +16 more
TL;DR: In this article, a holistic perspective on changing rainfall-driven flood risk is provided for the late 20th and early 21st centuries, which includes an assessment of changes in flood risk in seven of the regions considered in the recent IPCC SREX report.
Journal ArticleDOI
From fail-safe to safe-to-fail: Sustainability and resilience in the new urban world
TL;DR: The authors discusses the theory of resilience as it applies to urban conditions, and offers a suite of strategies intended to build urban resilience capacity: multifunctionality, redundancy and modularization, diversity, multi-scale networks and connectivity, and adaptive planning and design.
Journal ArticleDOI
Impediments and Solutions to Sustainable, Watershed-Scale Urban Stormwater Management: Lessons from Australia and the United States
Allison H. Roy,Seth J. Wenger,Tim D. Fletcher,Christopher J. Walsh,Christopher J. Walsh,Anthony Richard Ladson,William D. Shuster,Hale W. Thurston,Rebekah Ruth Brown +8 more
TL;DR: Comparing experiences from Australia and the United States, two developed countries with existing conventional stormwater infrastructure and escalating stream ecosystem degradation, are highlighted to highlight challenges facing sustainable urban stormwater management and offer several examples of successful, regional WSUD implementation.
Related Papers (5)
Impacts of reservoir operation and urbanization on flood inundation in The Vu Gia Thu Bon Basin, Vietnam
Thuy Nga To,Huy Vu,Hung Manh Le +2 more