Spatial Analysis of Soil Fertility Using Geographical Information Systems Technology

Njoku, J D; Nnaji, AO; Iwuji, M

doi:10.4314/afrrev.v5i4.69300

Cited by 3 publications

(3 citation statements)

References 3 publications

(3 reference statements)

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“…The Otamiri watershed consists of sandy soil with little clay, loam, and silt. The area is acidic with a pH value of between 4.67-5.6 for upper and lower layers and 5.0-5.6 at the crest and valley bottom and lower at mid-slope [10]. The general slope of the Otamiri watershed is 0.016 [11], and the average slope of Otamiri River at stations Chokocho and Nekede are 0.012 and 0.010, with widths of 11.07km and 8.30km, respectively [12].…”

Section: The Study Areamentioning

confidence: 99%

Adaptive Mitigation to Farmland Flooding as a Resilience Builder in Selected Communities in Etche Local Government Area of Rivers State, Nigeria

Ibama¹,

Tari²,

Nengi³

et al. 2022

AJGR

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In recent times the consequences of flooding on farmlands have been majorly attributed to climate change which has contributed to the distortions in the social and economic activities in Rivers State, Nigeria. This study aims to identify adaptive mitigative measures to manage the social and economic impact of farmlands flooding in selected communities in Etche Local Government Area in Rivers State. The objectives include the identification of the significant causes of farmland flooding in the study area, determining the social and economic impacts of farmland flooding in the study area, and identify mitigation measures put in place to combat farmland flooding in the study area. The study adopted the Mixed Methods Research approach using a concurrent triangulation research design. The data sources include questionnaire administration (using a 5-scale Likert Scale), key informant in-depth interviews, personal observation, photographs, and published materials from institutions. A total of 146 questionnaires were administered across these selected communities, including Nihi, Isu and Umuechem. A purposive sampling technique was deployed, and a total of 96 questionnaires were retrieved and validated for analysis. Some of the leading causes of farmland flooding include the blockage of storm-water channels, overgrazing and bush burning, overpopulation due to increased development (structures), heavy rainfall and drainage failure. The study further revealed that the social and economic impacts on farmland, communities and inhabitants are depression, stress, anger, and social vices. Other effects include loss of farmland and produce, increase in goods and services, loss of livelihood system, loss of income and damage to properties. The anticipated mitigative measures by respondents are a collaboration of stakeholders (farmers, communities, and government agencies), warning signals, reconstruction of failed drainages, quick responses, and adequate relief materials. In addition, the study recommended proper education and enlightenment of the vulnerable population on how to avoid the negative consequences of flood disasters. vulnerable people should prepare for any eventuality, real-time data on flood vulnerability mapping of the study area to enable the government, government agencies like the (NIMET) and the vulnerable population to know the extent of flooding and duration of every flooding episode. Furthermore, effective Spatial planning of those vulnerable communities to reduce the negative consequences of flood disaster and afforestation should be encouraged to mitigate adverse impacts of the flood.

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Section: The Study Areamentioning

confidence: 99%

Adaptive Mitigation to Farmland Flooding as a Resilience Builder in Selected Communities in Etche Local Government Area of Rivers State, Nigeria

Ibama¹,

Tari²,

Nengi³

et al. 2022

AJGR

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“…The soils are formed from two different underlying formations which are Oligocene (Benin-Ogwashi/Asaba formation) and Oligocene-Miocene (sedimentary formation) (Onweremadu and Peter, 2016; Okorafor et al, 2017). Hence the soil within the area is predominantly sandy with little percentages of clay, shale, silt and loam; the soil profile is remarkably uniform with varied percentages of nitrogen and carbon and heavily leached (Njoku et al 2011;Okorafor et al 2018).…”

Section: Iidescription Of Study Areamentioning

confidence: 99%

Mapping of Flood Prone Areas in Imo State, Southeastern Nigeria Using Gis Techniques

Okorafor¹,

Chikwue²,

Nwakuba³

et al. 2021

SCIRJ

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Flooding is a natural environmental hazard which has on a global scale caused irreparable losses on lives and property as well as deformation of the environment resulting in soil-nutrient loss, pollution of rivers/waterways, sedimentation of reservoirs and other negative issues in southeastern Nigeria. This study therefore makes use of GIS techniques to map areas in Imo State that are most prone or exposed to flooding. Satellite imagery and SRTM data were analyzed using ESRI ArcGIS 10.2 and Global Mapper v15 to generate maps for digital elevation model (DEM), digitized contour, 3D relief and flood vulnerability assessment. On analyzing the maps generated Oguta and Ohajiegbema were mapped as the most prone areas while Okigwe, Ideato North, Ideato South and Nkwerre were mapped the least prone. Nonetheless over 60% of the study area is still open to flood events if requisite environmental protective actions are not considered and implemented. On observing that the chief cause of flooding in the study area is heavy/prolonged rainfall/downpour with poor drainage channels, flood monitoring and assessment with proper design/construction of drainage networks/channels were among recommendations made to manage flood incidents in the study area.

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“…The otamiri watershed is dominated by sandy soil with little percentages of clay, loam and silt. The area is acidic with pH of between 4.67-5.6 for upper and lower layers and 5.0-5.6 at the crest and valley bottom and lower at midslope (Njoku et al, 2011). The watershed also in addition has low organic carbon ranging between 0.676-3.764 meq/100 g for upper soil layer, 5.34-4.27 meq/100 g for lower soil layer and lower at the midslope, low nitrogen concentration range of 0.008-0.068% and 0.018-0.048% for upper and lower soil layers (Njoku et al, 2011).…”

Section: Organic Nature and Type Of Soilmentioning

confidence: 99%

Evaluation of the Hydropower Potential of Otamiri River for Electric Power Generation

Okorafor¹,

Okereke²,

Egwuonwu³

2013

RJASET

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This research presents the estimation of the hydropower potential of River Otamiri through the hydrological analysis of the elements of climate as it affects its catchment area (section passing through the Federal University of Technology Owerri). The study involves the estimation of maximum design floods for the watershed using the Gumbels Probability Distribution Method for various return periods (T r ) with the development of unit hydrograph, storm hydrograph, runoff hydrograph and flood duration curve for the catchment area of the river. In addition watershed parameters like peak flow (Q p ), lag time (T l ), time of concentration (T c ) and rainfall intensity (I c ) were determined using the soil conservation service method and other empirical formulas. In order to determine the available flow for power generation, the stage/head of the river was estimated from records provided by the River Basin Development Authority (R.B.D.A) and flow duration analyses were carried out. The analysis revealed that for time flows of 50, 75 and 100% the following energy values were obtained 34.5 MW, 11.3 MW and 1.5 MW, respectively.

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Spatial Analysis of Soil Fertility Using Geographical Information Systems Technology

Abstract: The research evaluated soil fertility condition of River Otamiri watershed in southeastern Nigeria in relation to topographic heterogeneity using GIS

Cited by 3 publications

References 3 publications

Adaptive Mitigation to Farmland Flooding as a Resilience Builder in Selected Communities in Etche Local Government Area of Rivers State, Nigeria

Adaptive Mitigation to Farmland Flooding as a Resilience Builder in Selected Communities in Etche Local Government Area of Rivers State, Nigeria

Mapping of Flood Prone Areas in Imo State, Southeastern Nigeria Using Gis Techniques

Evaluation of the Hydropower Potential of Otamiri River for Electric Power Generation

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