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Electrical geophysical evaluation of susceptibility to flooding in University of Nigeria, Nsukka main campus and its environs, Southeastern Nigeria

Daniel Nnaemeka Obiora Johnson Cletus Ibuot

Obiora DN, Ibuot JC. 2023. Electrical geophysical evaluation of susceptibility to flooding in University of Nigeria, Nsukka main campus and its environs, Southeastern Nigeria. Journal of Groundwater Science and Engineering, 11(4): 422-434 doi:  10.26599/JGSE.2023.9280033
Citation: Obiora DN, Ibuot JC. 2023. Electrical geophysical evaluation of susceptibility to flooding in University of Nigeria, Nsukka main campus and its environs, Southeastern Nigeria. Journal of Groundwater Science and Engineering, 11(4): 422-434 doi:  10.26599/JGSE.2023.9280033

doi: 10.26599/JGSE.2023.9280033

Electrical geophysical evaluation of susceptibility to flooding in University of Nigeria, Nsukka main campus and its environs, Southeastern Nigeria

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  • Figure  1.  Examples of flood affected areas: (a, b and c) part of the University stadium predisposed to flooding during rainy season, (d) front of the University Secondary School during rainy season.

    Figure  2.  Geologic map of the area showing the location of the study area and the geological cross section along the line trending SW – NE.

    Figure  3.  Sample VES curves (a) VES 1 and (b) VES 4

    Figure  4.  Variation of resistivity of the layers 1, 2 and 3

    Figure  5.  Trend of resistivity reflection coefficients K1 and K2

    Figure  6.  Distribution of $ {K}_{1} $

    Figure  7.  Distribution of $ {K}_{2} $

    Figure  8.  Distribution of transverse resistivity

    Figure  9.  Distribution of longitudinal resistivity

    Figure  10.  Distribution of anisotropy

    Figure  11.  2D electrical resistivity tomography model of the study area along profile 1

    Figure  12.  2D electrical resistivity tomography model of the study area along profile 2

    Figure  13.  2D electrical resistivity tomography model of the study area along profile 3

    Figure  14.  2D electrical resistivity tomography model of the study area along profile 4

    Table  1.   Summary of measured electrical resistivity data in the study area

    VESLongitude/°ELatitude/°NLayer Resistivity/Ω·mThickness/mDepth/mElevation/m
    $ {\mathrm{\rho }}_{1} $$ {\mathrm{\rho }}_{2} $$ {\mathrm{\rho }}_{3} $$ {\mathrm{\rho }}_{4} $$ {\mathrm{h}}_{1} $$ {\mathrm{h}}_{2} $$ {\mathrm{h}}_{3} $$ {\mathrm{d}}_{1} $$ {\mathrm{d}}_{2} $$ {\mathrm{d}}_{3} $
    17.40296.8665196.2635.0700.711,275.62.95.715.02.98.623.5447
    27.40486.8657695.271.01,300.370,816.53.63.85.13.67.412.5457
    37.40376.86842,474.67,297.430,696.33,531.40.56.418.00.56.924.9447
    47.40776.8474694.75,092.01,693.042,416.80.53.024.30.53.527.9453
    57.40596.86916,775.72,926.924,433.36,221.56.811.135.26.817.953.1446
    67.39916.8613190.5174.3381.489,226.52.010.46.02.012.418.5440
    77.39816.86191,681.24,597.32,166.2864.30.93.135.40.94.039.4440
    87.40896.8698547.4870.61,125.91,322.43.27.415.82.210.626.4414
    97.42226.8525331.6103.52,212.02,398.02.84.67.12.87.414.5475
    107.40986.8596196.6760.9320.23,617.10.77.114.20.77.822.1454
    117.40386.8719314..71,532.95,083.7198.21.321.940.91.323.264.1402
    127.40676.8696213.7493.11,585.92,517.00.54.928.40.65.534.0412
    137.40166.8589798.9258.83,847.13,901.31.89.232.81.811.043.5432
    147.40916.8625393.442.31,672.11,246.81.82.339.51.84.143.6436
    157.40656.8585398.9874.72,855.54,554.01.36.453.11.37.760.8442
    下载: 导出CSV

    Table  2.   Summary of estimated hydrogeologic parameter

    VES
    points
    Long.
    /°E
    Lat.
    /°N
    Reflection coefficientρt
    /Ω·m
    ρl
    /Ω·m
    λ
    $ {k}_{1} $$ {k}_{2} $
    1 7.4029 6.8665 0.53 0.05 622.84 522.54 1.09
    2 7.4048 6.8657 −0.82 0.90 752.32 199.61 1.94
    3 7.4037 6.8684 0.49 0.62 24,115.42 14,950.76 1.27
    4 7.4077 6.8474 0.76 −0.50 2041.84 1,774.98 1.07
    5 7.4059 6.8691 −0.40 0.79 17,676.37 8,514.18 1.44
    6 7.3991 6.8613 −0.04 0.37 243.59 214.21 1.07
    7 7.3981 6.8619 0.47 −0.36 2,346.40 2,244.81 1.02
    8 7.4089 6.8698 0.02 0.33 900.13 803.71 1.06
    9 7.4222 6.8525 −0.52 0.91 1,179.99 258.48 2.14
    10 7.4098 6.8596 0.59 −0.41 458.49 384.35 1.09
    11 7.4038 6.8719 0.66 0.54 8,487.33 2,418.87 1.87
    12 7.4067 6.8696 0.40 0.53 1,407.18 1,119.77 1.12
    13 7.4016 6.8589 −0.51 0.87 2,968.13 945.44 1.77
    14 7.4091 6.8625 −0.81 0.95 1,533.33 528.02 1.70
    15 7.4065 6.8585 0.37 0.53 2,594.47 2,084.23 1.12
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-12-25
  • 录用日期:  2023-10-26
  • 网络出版日期:  2023-12-10
  • 刊出日期:  2023-12-31

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