scholarly journals Flash Flood Hazards

10.5772/28775 ◽  
2012 ◽  
Author(s):  
Denes Loczy ◽  
Szabolcs Czigany ◽  
Ervin Pirkhoffer
Keyword(s):  
Flash Flood ◽  
Flood Hazards

scholarly journals Flash Flood Impact Assessment in Jeddah City: An Analytic Hierarchy Process Approach

Hydrology ◽  
2020 ◽  
Vol 7 (1) ◽  
pp. 10 ◽  
Author(s):  
Umar Lawal Dano
Keyword(s):  
Analytic Hierarchy Process ◽  
Flash Flood ◽  
Productivity Loss ◽  
Flood Hazards ◽  
Analytic Hierarchy ◽  
Flood Impacts ◽  
Impact Reduction ◽  
Flood Impact ◽  
The Government ◽  
Hierarchy Process

Floods are among the most destructive natural hazards that cost lives and disrupt the socioeconomic activities of residents, especially in the rapidly growing cities of developing countries. Jeddah, a coastal city situated in Saudi Arabia, has experienced severe flash flood events in recent years. With intense rainfall, extensive coastal developments, and sensitive ecosystems, the city is susceptible to severe flash flood risks. The objective of this article is to apply an Analytic Hierarchy Process (AHP) model to explore the impacts of flash flood hazards and identify the most effective approaches to reducing the flash flood impacts in Jeddah using expert’s opinions. The study utilizes experts’ judgments and employs the AHP for data analyses and modeling. The results indicated that property loss has the highest probability of occurrence in the events of a flash flood with a priority level of 42%, followed by productivity loss (28%). Injuries and death were rated the least priority of 18% and 12%, respectively. Concerning flood impact reduction alternatives, river management (41%) and early warning system (38%) are the most favorable options. The findings could assist the government to design appropriate measures to safeguard the lives and properties of the residents. The study concludes by underscoring the significance of incorporating experts’ judgments in assessing flash flood impacts.

scholarly journals Impacts of Triple Factors on Flash Flood Vulnerability in Egypt: Urban Growth, Extreme Climate, and Mismanagement

Geosciences ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 24 ◽  
Author(s):  
Mohamed Saber ◽  
Karim I. Abdrabo ◽  
Omar M. Habiba ◽  
Sameh A. Kantosh ◽  
Tetsuya Sumi
Keyword(s):  
Urban Growth ◽  
Flash Flood ◽  
Integrated Approach ◽  
Annual Rainfall ◽  
Flood Hazards ◽  
Hazard Maps ◽  
Flood Vulnerability ◽  
Rainfall Analysis ◽  
Climatic Regions ◽  
Extreme Climate

Urban growth, extreme climate, and mismanagement are crucial controlling factors that affect flood vulnerability at wadi catchments. Therefore, this study attempts to understand the impacts of these three factors on the flash flood vulnerability in different climatic regions in Egypt. An integrated approach is presented to evaluate the urban growth from 1984 to 2019 by using Google Images and SENTINEL-2 data, and to develop hazard maps by using a rainfall-runoff-inundation model (RRI). Annual rainfall trend analysis was performed to evaluate the temporal variability trend. The hazard maps that were created were classified into three categories (low, medium, and high) and integrated with the urban growth maps to evaluate the impacts on the flood-vulnerable areas. The results show a significant increase in urban growth resulting in an increase of prone areas for flood hazards over time. However, the degree of this hazard is mainly related to growth directions. Mismanagement affects urban growth directions in both planned and unplanned growth, whether by loss of control over unplanned growth or by deficiencies in approved plans. The rainfall analysis showed that there is no explicit relationship to increases or decreases in the flood vulnerable areas. An urban planning approach is recommended for risk reduction management based on a comprehensive study considering such factors.

scholarly journals The impact of human activities on the occurrence of mountain flood hazards: lessons from the 17 August 2015 flash flood/debris flow event in Xuyong County, south-western China

2018 ◽  
Vol 9 (1) ◽  
pp. 816-840 ◽  
Author(s):  
Bin-rui Gan ◽  
Xing-nian Liu ◽  
Xing-guo Yang ◽  
Xie-kang Wang ◽  
Jia-wen Zhou
Keyword(s):  
Debris Flow ◽  
Human Activities ◽  
Flash Flood ◽  
Western China ◽  
Flood Hazards ◽  
The Impact

Application of kinematic wave theory for predicting flash flood hazards on coupled alluvial fan-piedmont plain landforms

2003 ◽  
Vol 17 (4) ◽  
pp. 839-868 ◽  
Author(s):  
Biswajit Mukhopadhyay ◽  
Joe Cornelius ◽  
Warren Zehner
Keyword(s):  
Flash Flood ◽  
Wave Theory ◽  
Alluvial Fan ◽  
Flood Hazards ◽  
Kinematic Wave ◽  
Piedmont Plain

scholarly journals Flash Flood Hazard Using Optical, Radar, and Stereo-Pair Derived DEM: Eastern Desert, Egypt

2018 ◽  
Vol 10 (8) ◽  
pp. 1204 ◽  
Author(s):  
Jehan Mashaly ◽  
Eman Ghoneim
Keyword(s):  
Arid Regions ◽  
Hydrological Modeling ◽  
Flash Flood ◽  
Flood Hazard ◽  
Meteorological Data ◽  
Eastern Desert ◽  
Stereo Pair ◽  
Flood Hazards ◽  
Storm Events ◽  
Alos Palsar

Flash floods are classified among the Earth’s most deadly and destructive natural hazards, particularly in arid regions. Wadi El-Ambagi, one of the largest drainage basins in the Eastern Desert of Egypt, is frequently subjected to severe flash flood damage following intense, short-lived rainstorms. This wadi is home to one of the few road networks which connects the Nile River Valley to the Red Sea Coast. At its outlet lies Quseir, one of the major coastal towns in the area. Quseir is a developing tourism and scuba diving town, and is known for its historical importance as an ancient port; thus, efforts are in place to preserve the town’s heritage. The lack of hydrological and meteorological data in this region necessitates the use of a hydrological modeling approach to predict the spatial extent, depth, and velocity of the flood waters, and hence locate sites at risk of flood inundation. This was accomplished by understanding the characteristics of surface runoff through modeled hydrographs. Here, elevation data were extracted from Shuttle Radar Topography Mission (SRTM) and a two-meter digital elevation model (DEM) derived from WorldView-2 stereo pair imagery. The land use/land cover and soil properties were mapped from fused ASTER multispectral and ALOS-PALSAR Synthetic Aperture Radar (SAR) data to produce a hybrid image that combines spectral properties and surface roughness, respectively. The results showed that storm events with rainfall intensities of 30 mm and ~60 mm over a two-hour period would generate maximum peak flows of 165 m3 s−1 and 875 m3 s−1 , respectively. The latter peak flow would generate floods with depths of up to 2 m within the town of Quseir. A flood of this magnitude would inundate 217 buildings, 7 km of the highway, and 1.43 km of the railroad in the downstream area of Wadi El-Ambagi. Findings from this work indicate that the integration of remote sensing and hydrological modeling can be a practical and quick approach to predict flash flood hazards in arid regions where data are scarce.

Characteristics of Urban Waterlogging and Flash Flood Hazards and Their Integrated Preventive Measures: Case Study in Fuzhou, China

2018 ◽  
Vol 4 (1) ◽  
pp. 05017007 ◽  
Author(s):  
Meihong Ma ◽  
Haijun Yu ◽  
Huixiao Wang ◽  
Feng Kong ◽  
Ke Zhang ◽  
...  
Keyword(s):  
Preventive Measures ◽  
Flash Flood ◽  
Flood Hazards

scholarly journals Risk Perception, Risk Communication, and Mitigation Actions of Flash Floods: Results from a Survey in Three Types of Communities

2021 ◽  
Vol 13 (22) ◽  
pp. 12389
Author(s):  
Ming Zhong ◽  
Lu Xiao ◽  
Qian Zhang ◽  
Tao Jiang
Keyword(s):  
Risk Perception ◽  
Risk Communication ◽  
Rural Community ◽  
Risk Perceptions ◽  
Flash Flood ◽  
Protective Action ◽  
Community Resilience ◽  
Flash Floods ◽  
Flood Hazards ◽  
Flood Warnings

In order to improve the decision-making of risk management and enhance community resilience to flash floods, the perception of risks, communication of warnings, and mitigation actions concerning flash floods were investigated in this study. The survey involves 280 participants from three types of communities in flash flood-prone areas. Results show that: (i) About 55.4% of community participants misperceived or underestimated the risk of flash floods, especially in the suburban communities, and people had misconceptions about the safety of crossing fast-flowing water, even though most of them had experienced flash flood hazards. (ii) In total, 67.9% of participants indicated that they had at some point received a flash flood warning. The perception of accuracy was related to trust in flash flood warnings, but they were different constructs for some individuals. Moreover, residents in the rural community and suburban community reported a closer social communication with neighbors, which would greatly influence inhabitants’ attitudes and behaviors towards the flash flood warnings and mitigation actions. (iii) Most of the participants indicated they would take some protective action when they received a warning. Risk perceptions and risk communications influence the mitigation actions in the community. Significant variables in the rural community and non-rural community were explored, and some important suggestions are highlighted. These findings suggest that risk perception and risk communication in neighborhoods help people to decide what action to take in the given scenarios, contribute to enhancing the community resilience, and contribute to coping with future flash floods in a more specific and effective way.

scholarly journals Compound flood impact forecasting: Integrating fluvial and flash flood impact assessments into a unified system

2021 ◽  
Author(s):  
Josias Ritter ◽  
Marc Berenguer ◽  
Francesco Dottori ◽  
Milan Kalas ◽  
Daniel Sempere-Torres
Keyword(s):  
Decision Support ◽  
Emergency Response ◽  
Flash Flood ◽  
Early Warning Systems ◽  
Economic Losses ◽  
Flood Hazards ◽  
Warning Systems ◽  
Physical Processes ◽  
Flood Impact ◽  
Municipal Level

Abstract. Floods can arise from a variety of physical processes. Although numerous risk assessment approaches stress the importance of taking into account the possible combinations of flood types (i.e. compound floods), this awareness has so far not been reflected in the development of early warning systems: Existing methods for forecasting flood hazards or the corresponding socio-economic impacts are generally designed for only one type of flooding. During compound flood events, these flood type-specific approaches are unable to identify the overall hazards or impacts. Moreover, from the perspective of the end-users (e.g. civil protection authorities), the monitoring of separate flood forecasts – with potentially contradictory outputs – can be confusing and time-consuming, and ultimately impede an effective emergency response. To enhance the decision support, this paper proposes the integration of different flood type-specific approaches into one compound flood impact forecast. This possibility has been explored by combining the simulations of two impact forecasting methods (representing fluvial and flash floods) for a recent catastrophic episode of compound flooding: the DANA event of September 2019 in Southeast Spain. The combination of the two methods identified well the overall compound flood extents and impacts reported by various information sources. For instance, the simulated economic losses amounted to about 670 million Euros against 425 million Euros of reported insured losses. Although the compound impact estimates were less accurate at municipal level, they corresponded significantly better to the observed impacts than those generated by the two methods applied separately. This demonstrates the potential of such integrated approaches for improving the decision support.

Flood hazard in Hungary: a re-assessment

2010 ◽  
Vol 2 (4) ◽  
Author(s):  
Dénes Lóczy
Keyword(s):  
River Flow ◽  
Flash Flood ◽  
Flood Hazard ◽  
Flood Hazards ◽  
Rainfall Events ◽  
Groundwater Levels ◽  
Excess Water ◽  
Water Hazard ◽  
Map Series ◽  
The 19Th Century

AbstractSome decades ago the concept of flood hazard in the Carpathian Basin was interpreted solely as riverine flood hazard, mostly restricted to the Tisza and Danube Rivers, and was closely associated with the impacts of river flow regulation in the second half of the 19th century. Recent assessments, however, allow us to outline a more diverse picture. Climate change is predicted to bring about both an increase in the frequency of droughts and excessive rainfall events, resulting in irregulaties in the water regimes of rivers in Hungary. Excess water hazard from raised groundwater levels is found to affect much larger areas than previously thought. Recent strongly localized cloudbursts, point to the increasing significance of flash floods.Riverine flooding and excess water hazard are more common in lowlands, whereas flash flood hazards are primarily, but not exclusively, affect the mountainous and hilly regions of the country. This paper intends to assess the relative importance of the three types of inundation hazard analyzed and to illustrate their overall spatial occurrences by microregions on a map series.

scholarly journals Assessment of Exposure to Flash Flooding in an Arid Environment: A Case Study of the Jeddah City Neighborhood Abruq Ar Rughamah, Saudi Arabia

2021 ◽  
pp. 383-397
Author(s):  
Saeed Alharbi ◽  
Gerald Mills
Keyword(s):  
Flash Flood ◽  
Urban Expansion ◽  
Interesting Case ◽  
Sociocultural Factors ◽  
Flood Hazards ◽  
Flash Flooding ◽  
Jeddah City ◽  
Flooding Risk ◽  
Site Rehabilitation

AbstractIn arid areas, flash floods represent one of the most severe hazards for people and infrastructure alike. The associated risks are compounded by increasing exposure and vulnerability through rapid and unregulated urbanization, poor infrastructure, and sociocultural factors, among other elements. This research explores the flash flooding risk in the Saudi Arabian city of Jeddah with a particular focus on the Abruq Ar Rughamah neighborhood, which experienced a destructive flood in November 2009 that resulted in 116 deaths and 1,200 families becoming homeless. The neighborhood is an interesting case study as it has two distinctive urban layouts representing planned and irregular settlement types. In this paper, the focus is placed on exposure to flash flood hazards using a geographic information system to study urban layouts, building types, and resident populations in conjunction with data from satellites, flood mapping studies, and topographic data. The results show that most of the study area is located along a natural flood path. The regions that were affected by the 2009 disaster received no comprehensive site rehabilitation. This paper concludes that it is important to develop a risk management strategy that includes limiting urban expansion in flood-prone areas and redesigning neighborhoods to increase flood resilience.

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