Spatial Assessment of Flood Vulnerability  in Aba Urban Using Geographic Information System Technology and Rainfall Information

Ogbonna, Chidi Enyinnaya; Ike, Felix; Okwu-Delunzu, Virginia U.

doi:10.4236/ijg.2015.63013

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…Generally, the Nkowankowa area is 'vulnerable to floods' and more focus and attention are required on the physical component than on social and economic components of vulnerability. Flat or low-altitude locations exacerbate the vulnerability to floods because run-off from higher ground tends to accumulate in these low elevations [77]. Figure 10 provides a comparative analysis of flood vulnerability assessments between the three study sites.…”

Section: Indicators Of Flood Vulnerabilitymentioning

confidence: 99%

Vulnerability and Adaptation to Flood Hazards in Rural Settlements of Limpopo Province, South Africa

Munyai

Chikoore

Musyoki

et al. 2021

Water

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Climate change has increased the frequency of extreme weather events such as heavy rainfall leading to floods in several regions. In Africa, rural communities are more vulnerable to flooding, particularly those that dwell in low altitude areas or near rivers and those regions affected by tropical storms. This study examined flood vulnerability in three rural villages in South Africa’s northern Limpopo Province and how communities are building resilience and coping with the hazard. These villages lie at the foot of the north-eastern escarpment, and are often exposed to frequent rainfall enhanced by orographic factors. Although extreme rainfall events are rare in the study area, we analyzed daily rainfall and showed how heavy rainfall of short duration can lead to flooding using case studies. Historical floods were also mapped using remote sensing via the topographical approach and two types of flooding were identified, i.e., those due to extreme rainfall and those due to poor drainage or blocked drainage channels. A field survey was also conducted using questionnaires administered to samples of affected households to identify flood vulnerability indicators and adaptation strategies. Key informant interviews were held with disaster management authorities to provide additional information on flood indicators. Subsequently, a flood vulnerability index was computed to measure the extent of flood vulnerability of the selected communities and it was found that all three villages have a ‘vulnerability to floods’ level, considered a medium level vulnerability. The study also details temporary and long-term adaptation strategies/actions employed by respondents and interventions by local authorities to mitigate the impacts of flooding. Adaptation strategies range from digging furrows to divert water and temporary relocations, to constructing a raised patio around the house. Key recommendations include the need for public awareness; implementation of a raft of improvements and a sustainable infrastructure maintenance regime; integration of modern mitigations with local indigenous knowledge; and development of programs to ensure resilience through incorporation of Integrated Development Planning.

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Section: Indicators Of Flood Vulnerabilitymentioning

confidence: 99%

Vulnerability and Adaptation to Flood Hazards in Rural Settlements of Limpopo Province, South Africa

Munyai

Chikoore

Musyoki

et al. 2021

Water

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“…The study area of this paper is located in the western Sichuan Plateau. Given its abundant natural resources, frequent geological hazards [63], extreme climate [64], and human activities intensified by tourism development, the VSD could better reflect the impact of natural factors (especially climatic factors) and human factors on the socioecological system [65]. Given that, in this paper, the VSD is selected to build the index system reflecting factors impacting the socio-ecological vulnerability in Aba Prefecture and study the long-time-series vulnerability variation.…”

Section: Introductionmentioning

confidence: 99%

Socio-Ecological Vulnerability in Aba Prefecture, Western Sichuan Plateau: Evaluation, Driving Forces and Scenario Simulation

Yang

Dai

et al. 2022

IJGI

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With the social and economic development in recent years, human activities have been more extensive and intensified. As a result, ecosystems are damaged to varying degrees, and regional ecological environments tend to be weaker. The socio-ecological system in Aba Prefecture, Western Sichuan Plateau, China, the researched area, also faces increasingly serious problems. To advance ecological civilization development in a coordinated way across the country, the national government and the competent authorities have launched a series of new strategies. Research on socio-ecological vulnerability, a major part of the ecosystem protection and restoration program, is provided with powerful spatial data observation and analysis tools thanks to the invention and development of remote sensing and geographic information system technologies. This study was based on the vulnerability scoping diagram (VSD) framework. Multi-source data such as digital elevation model (DEM), geographical data such as land use types, soil and geological disasters, remote sensing image data, meteorological data and social statistics data from 2005 to 2019 were used to construct the temporal social-ecosystem vulnerability evaluation index database of Aba Prefecture, Western Sichuan Plateau. The spatial principal component analysis (SPCA) is applied to evaluating the socio-ecological vulnerability and analyzing its spatial-temporal variation in Aba Prefecture, Western Sichuan Plateau. To probe into the driving effects of various impact factors on the socio-ecological vulnerability, the Geodetector is used to analyze the driving factors. The ordered weighted average (OWA) method is applied to the multi-scenario analysis of socio-ecological vulnerability in the researched area. The conclusions of this study are as follows: (1) from 2005 to 2019, the spatial distribution characteristics of exposure and sensitivity in Aba Prefecture were higher in the southeast and lower in the northwest, and the overall spatial distribution characteristics of socio-ecological system vulnerability showed that the degree of vulnerability increased from the north to the southeast. (2) Extreme natural climate conditions play a leading role in the driving of socio-ecosystem vulnerability, followed by human production activities and geological hazards. (3) The degree of social-ecosystem vulnerability in Aba Prefecture will increase with the increase of decision risk coefficient. The results of social-ecosystem vulnerability under the status quo scenario are similar to those in 2010 and 2019, indicating that the selected evaluation factors can reflect the actual social-ecosystem vulnerability. In the sustainable guided scenario and the unsustainable guided scenario, the proportion of the area of the social-ecosystem severe vulnerability level was at the minimum value and the maximum value, respectively.

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Flooding in Nigeria: a review of its occurrence and impacts and approaches to modelling flood data

Umar

Gray

2022

International Journal of Environmental Studies

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Spatial Assessment of Flood Vulnerability in Aba Urban Using Geographic Information System Technology and Rainfall Information

Cited by 4 publications

References 11 publications

Vulnerability and Adaptation to Flood Hazards in Rural Settlements of Limpopo Province, South Africa

Vulnerability and Adaptation to Flood Hazards in Rural Settlements of Limpopo Province, South Africa

Socio-Ecological Vulnerability in Aba Prefecture, Western Sichuan Plateau: Evaluation, Driving Forces and Scenario Simulation

Flooding in Nigeria: a review of its occurrence and impacts and approaches to modelling flood data

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