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Geotechnical characteristics of soils susceptible to severe gullying in eastern Nigeria
Abstract The geotechnical characteristics of soils that are susceptible to severe gullying in the rain forest zone of Nigeria were studied. The soils are predominantly sands whose fines (silt/clay) contents are very negligible. The sands are loose (dry density 1.42–1.73 g/$ cm^{3} $) and highly permeable (permeability 9.43×$ 10^{3} $−3.4×$ 10^{2} $cm/s) with permeability increasing with depth. Porosities and void ratios are also high (41.6–50.3% and 0.71–1.01 respectively), while cohesion is small to zero (0–85 kN/$ m^{2} $). It is thought that although these conditions favour less runoff and high infiltration, they lead to high internal flow velocities and seepage pressures, and ultimately high internal erosion. It is concluded that once a gully is initiated, the soil properties become responsible for rapid propagation. Non response of the gullies studied to afforestation control measures is thought to result from these soil properties.
Geotechnical characteristics of soils susceptible to severe gullying in eastern Nigeria
Abstract The geotechnical characteristics of soils that are susceptible to severe gullying in the rain forest zone of Nigeria were studied. The soils are predominantly sands whose fines (silt/clay) contents are very negligible. The sands are loose (dry density 1.42–1.73 g/$ cm^{3} $) and highly permeable (permeability 9.43×$ 10^{3} $−3.4×$ 10^{2} $cm/s) with permeability increasing with depth. Porosities and void ratios are also high (41.6–50.3% and 0.71–1.01 respectively), while cohesion is small to zero (0–85 kN/$ m^{2} $). It is thought that although these conditions favour less runoff and high infiltration, they lead to high internal flow velocities and seepage pressures, and ultimately high internal erosion. It is concluded that once a gully is initiated, the soil properties become responsible for rapid propagation. Non response of the gullies studied to afforestation control measures is thought to result from these soil properties.
Geotechnical characteristics of soils susceptible to severe gullying in eastern Nigeria
Okagbue, C. O. (author) / Ezechi, J. I. (author)
1988
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
Geotechnical characteristics of soils susceptible to severe gullying in eastern Nigeria
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