Quantitative assessment of urban flood disaster vulnerability based on text data: case study in Zhengzhou

2019 ◽  
Vol 20 (2) ◽  
pp. 408-415
Author(s):  
Zening Wu ◽  
Yanxia Shen ◽  
Huiliang Wang ◽  
Meimei Wu
Keyword(s):  
Heavy Rainfall ◽  
Flood Control ◽  
Real Life ◽  
Flood Disaster ◽  
Coverage Area ◽  
Vulnerability Curve ◽  
Disaster Vulnerability ◽  
Rainfall Index ◽  
Mitigation And Adaptation ◽  
Curve Model

Abstract Planning to evaluate flood disaster vulnerability is a crucial step towards risk mitigation and adaptation. In this study, the vulnerability curve model was established with one highly popular area of research in mind: big data. Web crawler technology was used to extract text information related to floods from Internet and social media platforms. Based on the three indicators of rainfall intensity, duration and coverage area, the heavy rainfall index was calculated, while the comprehensive disaster index was calculated based on the affected population, area and direct economic loss. Taking the heavy rainfall index as an independent variable and comprehensive disaster index as a dependent variable, the vulnerability curve of flood disasters was established, and the performance of this model was validated by comparing it with real-life situations. The results show that the relationship between rainfall and disaster is significant, and there is exponential correlation between the heavy rainfall index and comprehensive disaster index. This model is more than 65% accurate, which demonstrates the discriminative power of the established curve model. The results provide some basis for flood control and management in cities.

Lessons Learned from Tokai Heavy Rainfall

2007 ◽  
Vol 2 (1) ◽  
pp. 50-53 ◽  
Author(s):  
Akihiro Tominaga ◽  
Keyword(s):  
Control Systems ◽  
Heavy Rainfall ◽  
Flood Control ◽  
Lessons Learned ◽  
Flood Disaster ◽  
Drainage Basins ◽  
Urban Flood ◽  
Wide Range ◽  
The Many ◽  
Heavy Damage

In September 2000, heavy rainfall in the Tokai district flooded Nagoya and its surroundings, wreaking heavy damage. This flood showed typical aspects of urban flood disaster. The damage expanded in a wide range and paralyzed city operations. This revealed the many problems of complex flood control systems in urbanized drainage basins and evacuation and rescue systems. The cases of the Shinkawa and Tenpaku Rivers are discussed below as typical urban flood problems.

Comprehensive flood control involving citizens in a Japanese watershed

2013 ◽  
Vol 68 (4) ◽  
pp. 791-798 ◽  
Author(s):  
Sampei Yamashita ◽  
Yukihiro Shimatani ◽  
Ryoichi Watanabe ◽  
Toshiyuki Moriyama ◽  
Tomoko Minagawa ◽  
...  
Keyword(s):  
Urban Areas ◽  
Heavy Rainfall ◽  
Flood Control ◽  
Drainage System ◽  
Flood Disaster ◽  
Control Measures ◽  
The City

In July 2009, the city of Fukuoka, Japan experienced a flood disaster along the Hii River, which runs through densely populated, concrete-covered areas of the city. The drainage system was overwhelmed and the river overflowed due to heavy rainfall and rapid runoff. The event led citizens in its watershed to plan and implement comprehensive flood control. The plan aims not only to mitigate floods but also to revitalize the river environment and populated communities in urban areas. This study reports the activities led by the citizens. They organized and carried out civic forums, workshops, and fieldwork to share views as to how the flood disaster was caused, how floods in the watershed should be controlled, and how the river environment should be rehabilitated. This study illuminates how people, including the flood victims and municipal engineers, can change drastically and communicate effectively in the course of discussing and implementing the comprehensive flood control measures.

scholarly journals Assessing Urban Areas’ Vulnerability to Flood Disaster Based on Text Data: A Case Study in Zhengzhou City

2019 ◽  
Vol 11 (17) ◽  
pp. 4548 ◽  
Author(s):  
Wu ◽  
Shen ◽  
Wang
Keyword(s):  
Big Data ◽  
Vulnerability Assessment ◽  
Urban Areas ◽  
Flood Control ◽  
Flood Disaster ◽  
Assessment Model ◽  
Text Data ◽  
Disaster Vulnerability ◽  
Model Based ◽  
Flood Disasters

Confronting the frequent flood disasters triggered by torrential downpour, the vulnerability of urban rainstorm flood disasters was analyzed with one highly popular area of research in mind: big data. Web crawler technology was used to extract text information related to floods from Internet and popular social media platforms. Combining these text data with traditional statistical data, a flood disaster vulnerability assessment model based on Analytic Hierarchy Process (AHP) was established to evaluate rainstorm and flood disaster vulnerability, and the spatial distribution characteristics of vulnerability to pluvial flooding were analyzed based on Geographic Information System (GIS). The established model was applied in Zhengzhou, a city that often suffers from heavy rainstorms. The results show that the areas located near downtown Zhengzhou were more vulnerable to rainstorm and flooding than others, and most of the city could be at moderate and high vulnerability. Finally, the waterlogging spots extracted from various sources were used to evaluate the performance of the proposed model. The results show that most of waterlogging spots were located in very-high and high risk zones, while less waterlogging spots were found in districts with low vulnerability, which demonstrates the discriminative power of the established model based on big data sources. This study overcomes limited data in flood disaster vulnerability assessment methods and provides a basis for flood control and management in cities.

scholarly journals A Case Study of Flood Risk Evaluation Based on Emergy Theory and Cloud Model in Anyang Region, China

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 420
Author(s):  
Zening Wu ◽  
Yuhai Cui ◽  
Yuan Guo
Keyword(s):  
Risk Assessment ◽  
Flood Risk ◽  
Flood Control ◽  
Flood Hazard ◽  
Cloud Model ◽  
Flood Disaster ◽  
Assessment System ◽  
Assessment Model ◽  
Flood Risk Assessment ◽  
Emergy Theory

With the progression of climate change, the intensity and frequency of extreme rainfall have increased in many parts of the world, while the continuous acceleration of urbanization has made cities more vulnerable to floods. In order to effectively estimate and assess the risks brought by flood disasters, this paper proposes a regional flood disaster risk assessment model combining emergy theory and the cloud model. The emergy theory can measure many kinds of hazardous factor and convert them into unified solar emergy (sej) for quantification. The cloud model can transform the uncertainty in flood risk assessment into certainty in an appropriate way, making the urban flood risk assessment more accurate and effective. In this study, the flood risk assessment model combines the advantages of the two research methods to establish a natural and social dual flood risk assessment system. Based on this, the risk assessment system of the flood hazard cloud model is established. This model was used in a flood disaster risk assessment, and the risk level was divided into five levels: very low risk, low risk, medium risk, high risk, and very high risk. Flood hazard risk results were obtained by using the entropy weight method and fuzzy transformation method. As an example for the application of this model, this paper focuses on the Anyang region which has a typical continental monsoon climate. The results show that the Anyang region has a serious flood disaster threat. Within this region, Linzhou County and Anyang County have very high levels of risk for flood disaster, while Hua County, Neihuang County, Wenfeng District and Beiguan District have high levels of risk for flood disaster. These areas are the core urban areas and the economic center of local administrative regions, with 70% of the industrial clusters being situated in these regions. Only with the coordinated development of regional flood control planning, economy, and population, and reductions in the uncertainty of existing flood control and drainage facilities can the sustainable, healthy and stable development of the region be maintained.

Study on Urban Flood Control and Drainage in Beijing

2014 ◽  
Vol 1065-1069 ◽  
pp. 2381-2385
Author(s):  
Sen Guo Zhan ◽  
Bao Hui Men ◽  
Jia Jie Wu ◽  
Zheng Da Duan
Keyword(s):  
Heavy Rainfall ◽  
Flood Control ◽  
The Philippines ◽  
City Government ◽  
Urban Flood ◽  
The City ◽  
New Look

On 21 July 2012, a huge thunderstorm hit Beijing, prompting the city government to act immediately to deal with the emergency. Yet great losses were caused, exposing problems about urban flood control and drainage, and making people take a new look at them. It is not uncommon for a rainfall of such a degree to happen in Asia. Comparatively speaking, however, unlike in Beijing, fewer damages are caused in Taiwan, Japan and the Philippines given the same situation. In this article, therefore, the problems arising after a heavy rainfall and their solutions will be discussed.

An appraisal of post flood dengue vector Aedes albopictus Skuse (Diptera: Culicidee) surveillance in a coastal district of Kerala, India

ENTOMON ◽  
2021 ◽  
Vol 46 (1) ◽  
pp. 25-32
Author(s):  
R. Rajendran ◽  
S.R. Karmakar ◽  
Vinay Garg ◽  
Rajlakshmi Viswanathan ◽  
Kamran Zaman ◽  
...  
Keyword(s):  
Aedes Albopictus ◽  
Heavy Rainfall ◽  
Flood Disaster ◽  
Dengue Vector ◽  
Vector Borne Disease ◽  
Vector Borne ◽  
Coastal District

Alappuzha coastal district was worst affected by floods due to the heavy rainfall in August 2018. Aedes albopictus survey carried out in the post flood/ disaster areas covering 1,140 households revealed maximum larval positivity in plastic/leather followed by metal and earthen containers. The House index ranged from 1.75 to 12.28 per cent whereas the container index ranged from 1.73 to 20.51 per cent. Breteau index ranged from 3.5 to14.3. As dengue is endemic in the district, there exists a potential outbreak of the vector borne disease.

Flood Disaster and Flood Control Measurements in Shanghai

2017 ◽  
Vol 18 (1) ◽  
Author(s):  
Zhengzheng Zhou ◽  
Shuguang Liu ◽  
Guihui Zhong ◽  
Yi Cai
Keyword(s):  
Flood Control ◽  
Flood Disaster

scholarly journals NUMERICAL SIMULATION OF FLOOD DISASTER DUE TO HEAVY RAINFALL OF JULY 2006 IN MATSUE CITY

2007 ◽  
Vol 51 ◽  
pp. 535-540 ◽  
Author(s):  
Kenji KAWAIKE ◽  
Hajime NAKAGAWA ◽  
Yutaka ICHIKAWA ◽  
Hirotatsu MARUYAMA
Keyword(s):  
Numerical Simulation ◽  
Heavy Rainfall ◽  
Flood Disaster

scholarly journals Flood disasters in the Changjiang River and their geo-environmental implications

2001 ◽  
Vol 23 ◽  
Author(s):  
Chuanzheng Liu
Keyword(s):  
Flood Control ◽  
Flood Disaster ◽  
Control Measures ◽  
Changjiang River ◽  
Environmental Implications ◽  
Wuhan City ◽  
The Third ◽  
The Changjiang River ◽  
Flood Disasters ◽  
Scientists And Engineers

The archaeological records of past 5,000 years revealed that a period of high (13.6 m) flood occurred in the Changjiang River in 2,000 years BP. A serious flood disaster happened in the middle and lower reaches of the Changjiang River in 1998. This event reverberated through the whole country and led to the very important attention by many scientists and engineers. In this paper, it is proposed to carry out the following three flood control measures. The first is to improve the flood control standard, which includes dredging river course and reinforcing dykes or dams. The second is to dig a channel through the Dongjing River (an old course of the Changjiang River) to divert the flood for avoiding the simultaneous flooding from different rivers and to remove the flood disaster for the Wuhan City. The third is to form gradually a great lake across the Changjiang River to contain the Dongting Lakeand Jianghan Lakes, which will supp ly the fresh water to be enough for the society and economic development of the middle China in the 21st century.

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