Urban Flood Vulnerability Mapping of Lagos, Nigeria

Kaoje, Ismaila Usman; Ibrahim, Ishiaku

doi:10.20319/mijst.2017.s31.224236

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…Various flood management methods are used to prevent or reduce the detrimental effects of floodwaters. Many models or methods are being used around the world to assess, explore, and identify intervention measures to mitigate the effects of the flood [52][53][54][55][56][57][58][59][60]. HEC-RAS, Sobek, Mike12, XP-SWMM, TUFLOW, and OpenFlows FLOOD are widely used for hydrodynamic modelling of floods generally [61].…”

Section: Flood Mapping Practicesmentioning

confidence: 99%

An Evaluation of Risk-Based Agricultural Land-Use Adjustments under a Flood Management Strategy in a Floodplain

2021

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Agricultural damage due to floods in the Indus basin’s fertile land has been the most damaging natural disaster in Pakistan so far. Earthen dikes are protecting the vast areas of the floodplain from regular flooding. However, the floodplain is attractive to farmers due to its fertility and experiences regular crop production within and out of the dike area. This paper evaluates the flood risk in a floodplain of the Chenab river in Pakistan and recommends land-use changes to reduce the flood risk for crops and associated settlements within the study area. The objective of the land-use change is not just to reduce flood losses but also to increase the overall benefits of the floodplain in terms of its Economic Rent (ER). This preliminary study analyses the economic impacts of the risk-based land-use improvements on existing floodplain land uses. Expected Annual Damage (EAD) maps were developed using hydrodynamic models and GIS data. The developed model identified the areas where maize can be economically more productive compared to rice under flood conditions. Promising results were obtained for the settlement relocations. It was also observed that the infra-structure, running parallel to the river, plays a significant role in curtailing the extent of floods. The results show that a combination of structural and non-structural measures proves more effective. The study also recommends the inclusion of social and environmental damages as well as other types of non-structural measures to develop the most effective flood management strategy.

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Section: Flood Mapping Practicesmentioning

confidence: 99%

An Evaluation of Risk-Based Agricultural Land-Use Adjustments under a Flood Management Strategy in a Floodplain

2021

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“…A spatial information of disaster situation is critical information to support recovery, mitigation, and planning in disaster management (Eguchi et al, 2001;Miyazaki, Nagai, & Shibasaki, 2015). For instance, urban flood vulnerability mapping could help make a decision on flood disaster planning (Usman Kaoje & Ishiaku, 2017).…”

Section: Introductionmentioning

confidence: 99%

Sentinel-1a Analysis for Damage Assessment: A Case Study of Kumamoto Earthquake in 2016

Tamkuan

Nagai

2019

mijst

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The powerful earthquakes occurred in Kumamoto at the highest magnitude 7.3 hitting this prefecture on April 16, 2016 at 01.25 A.M. local time. This study proposed a method to utilize Sentinel-1A images to detect earthquake damaged areas. There were two images being used.One was before-earthquake images (on March 3, 2016 and March, 27 2016) and another was an after-earthquake image (on April 20, 2016). The method operated on interferometric coherence of sentinel-1A image. In order to estimate the damaged areas, the coherence change between the before-earthquake and during-earthquake pairs were processed. The damage map was produced by concerning into different classes comprised of the urban damaged areas, none and less damaged of the urban areas, and non-urban areas. This approach was compared with the ground-truth data, which provides high overall accuracy at 88% (kappa coefficient is 0.82). 24 Consequently, Sentinel-1A could contribute the insightful geospatial information of the earthquake situation and support the disaster management. KeywordsDamage Assessment, Sentinel-1A, Interferometric Coherence, Kumamoto Earthquake * 1 1 * 2 2 * Sentinel-1A could be appropriately applied in the earthquake damage detection. Also, the interferometric technique was efficient enough for detecting the earthquake displacement, and the damage assessment. The interferogram shows the phase change induced by earthquake from satellite looking dimension while the coherence analysis result presents the possibility of the large damaged areas without the interference of cloud coverage, which still performs the high accuracy. Moreover, the Sentinel-1A could provide the accelerated observation within 5 days after the disaster occurred. However, the further discussions are still concerned for the future study. The result was included some effects by the processing method and atmospheric conditions because Sentinel-1A provides C-band information. The wavelength is short about 5-6 centimeters, could have more effects than the longer wavelength. The spatial resolution was roughly generated with the default resolution at 100 meters operated by the software. It was rougher than using the higher resolution such as ALOS-2, which was investigated on the earthquake damage assessment (Tamkuan & Nagai, 2017). However, the spatial resolution depends on the SAR observation modes. For damage assessment, our study considered only the damaged, and none to less damaged areas. The multi-level of damages will be considered in further study. The spatial resolution is important for the damage classification. The density of urban and damaged areas could lead to the quality of the damage map. Some damaged buildings with 100x100 pixel of non-damaged areas may unfortunately be missing information.This point should be focused for next study to improve the accuracy for the earthquake detection. ConclusionThis study proposed the method to detect the earthquake damaged areas using multitemporal Sentinel-1A images. The damaged areas could be rapidly detected i...

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Factors influencing the occurrence of flooding, risk and management strategies in Lagos, Nigeria

Akoteyon

2022

Sustain. Water Resour. Manag.

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Urban Flood Vulnerability Mapping of Lagos, Nigeria

Abstract: The paper aimed to demonstrate how the application of HEC-RAS and GIS techniques can be utilized for better results when carrying out a flood vulnerability mapping and assessment. Digital interpretation that uses HEC-RAS and GIS

Cited by 5 publications

References 2 publications

An Evaluation of Risk-Based Agricultural Land-Use Adjustments under a Flood Management Strategy in a Floodplain

An Evaluation of Risk-Based Agricultural Land-Use Adjustments under a Flood Management Strategy in a Floodplain

Sentinel-1a Analysis for Damage Assessment: A Case Study of Kumamoto Earthquake in 2016

Factors influencing the occurrence of flooding, risk and management strategies in Lagos, Nigeria

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