Correlate Mapping of Impervious Surfaces as Flood Risk Assessment Strategy in Owerri, Southeastern Nigeria

Njoku, John Didacus; Ukaegbu, K; Osumgborogwu, Ikenna; Udeh, Anayo D.; Telu, Mercy

doi:10.9734/ajee/2017/33974

Cited by 4 publications

(6 citation statements)

References 2 publications

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“…It is not known over what period these studies were conducted. However, retreat rates of the old gullies are high when compared to other parts of the world, for example, Frankl et al (2012) Enaruvbe & Ige-Olumide, 2015; Njoku et al, 2017). However, results…”

Section: Discussionmentioning

confidence: 97%

“…Previous authors have documented sustained land‐use changes, especially, changes from vegetated to paved surfaces in parts of southeast Nigeria (AC‐Chukwuocha, 2015; Enaruvbe & Atedhor, 2015; Enaruvbe & Ige‐Olumide, 2015; Njoku et al, 2017). However, results presented here show that while the entire study area experienced reductions in fallow‐cover at the regional scale, land uses in gully catchments are heterogeneous (Table 1 of supplementary material).…”

Section: Discussionmentioning

confidence: 99%

“…Land use was classified at the regional and catchment scales. Catchment‐scale land‐use classifications were important to identify possible variations in land uses in different catchments which may in turn impact hydrological processes that are often perceived to be an important driver of gullying (Birhanu et al, 2019; Njoku et al (2017). In the study area, land is used for farming, building or left to fallow, hence land use was classified into three: non‐vegetated (bare surfaces and built environments), open vegetation (grasses and farms) and fallow/trees (non‐farmed land left to fallow).…”

Section: Methodsmentioning

confidence: 99%

“…Land use was classified at the regional and catchment scales. Catchment-scale land-use classifications were important to identify possible variations in land uses in different catchments which may in turn impact hydrological processes that are often perceived to be an important driver of gullying (Birhanu et al, 2019;Njoku et al (2017). In the study area, land is used for farming, building or left…”

Section: Land-use Classificationmentioning

confidence: 99%

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A multi‐method approach to analyse changes in gully characteristics between 2009 and 2018 in southeast Nigeria

et al. 2022

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Gully erosion is the dominant environmental problem in southeast Nigeria and has led to loss of human and material resources. In this study, we evaluated changes in gully characteristics in southeast Nigeria and their potential drivers between 2009 and 2018 using a multi‐method approach: analysis of high‐resolution satellite imagery (2–5 m) and focus group discussions. Gully numbers increased from 26 to 39 and mean gully length increased from 0.39 to 0.43 km. We found that land adjacent to rivers had the highest concentration of gullies which is associated with an increase in slope angle from 10 to 58% up to 500 m from rivers. Regarding potential gully‐drivers, land‐use changes were observed. Non‐vegetated lands increased from 58.6 to 144.7 km2 between 2009 and 2018, while reductions in fallow lands from 281.2 to 57.8 km2 were observed. Results from focus group meetings indicate there was no gullying in the area before the Nigerian civil war (1967–1970). War‐time activities such as digging trenches and increased population density were said to have led to the formation of the oldest gullies in the area. Although war‐time activities have ceased, meeting attendees believed that present land‐use changes have increased the volume of surface runoff and thus enhancing gully erosion. Incorporating local knowledge in this study has therefore provided a valuable understanding on the key drivers of gullying that pre‐dates the availability of freely available high‐resolution satellite data.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Land-use Classificationmentioning

confidence: 99%

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A multi‐method approach to analyse changes in gully characteristics between 2009 and 2018 in southeast Nigeria

et al. 2022

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“…Most of the researches on ooding in Imo State have so far been limited to physical measures. For instance, studies by Emeribeole (2013), Duru and Chibo (2014), Njoku et al (2017) limited their recommendations to physical measures. Flooding cannot be totally eradicated in Nigeria owing to the various infrastructure challenges and the unforeseen weather changes occasioned by climate change.…”

Section: Introductionmentioning

confidence: 99%

Factors Influencing Homeowners' Decision to Purchase Flood Insurance in Flood-prone Areas of Imo State, Nigeria

Onyike

Onuoha

Gerald-Ugwu

2022

Preprint

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Severe floods have become an annual experience in Imo State inflicting losses of lives and property on the population. The most affected areas are Oguta, Ohaji/Egbema and Owerri. This situation notwithstanding, most homeowners in these areas have not taken advantage of flood insurance facility. This study attempts to identify the factors affecting homeowners' flood insurance purchase decisions in Oguta, Ohaji/Egbema and Owerri, and to apply discriminant analysis technique on those factors to determine whether or not there are significant differences in perception between those willing to purchase flood insurance and those not willing. The study equally seeks to determine the variables that best account for the differences in perception between the two groups. Tests using Wilks’ lambda, eigenvalues, canonical correlation, functions at group centroids, and classification accuracy were applied on identified sets of relevant determinants. The study found that those willing to purchase flood insurance were more concerned with the mitigation of flood catastrophe, apparently because they are worst hit by the floods, while those who were not willing were more indifferent as they appear to be less certain and aware of flood insurance. However, the variables with the most predictive power in accounting for the differences in perception and have the highest impact were found to be within the measures of behavioral, attitudinal and emotional determinants. The study therefore concludes that the likelihood of purchasing flood insurance in the study areas depends greatly on information availability, consumers’ insurance literacy and level of trust on the integrity of insurance companies.

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Planetary Health Governance: A Tool of Transdisciplinary Collaborations for Sustainable Development

Ibrahim,

Prior

2024

Climate Change Management

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Correlate Mapping of Impervious Surfaces as Flood Risk Assessment Strategy in Owerri, Southeastern Nigeria

Cited by 4 publications

References 2 publications

A multi‐method approach to analyse changes in gully characteristics between 2009 and 2018 in southeast Nigeria

A multi‐method approach to analyse changes in gully characteristics between 2009 and 2018 in southeast Nigeria

Factors Influencing Homeowners' Decision to Purchase Flood Insurance in Flood-prone Areas of Imo State, Nigeria

Planetary Health Governance: A Tool of Transdisciplinary Collaborations for Sustainable Development

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