Vol. 1, No. 1, October 2014
Table of Contents
Comparative Estimation of Measured and Empirical Soil Loss from Ephemeral Gully Erosion in Mubi, Northeast Nigeria
Authors: *I.J. Tekwa, A.B. Alhassan and F. Fali
Pages: 1 - 9
A 2 year field study was carried out in Mubi area to assess soil loss from ephemeral gully (EG) erosion at 6 different locations (Digil, Vimtim, Muvur, Gella, Lamorde and Madanya) between April, 2008 and October, 2009. Each location consisted of three watershed sites from where data were collected during the study period. Land use and conservation practices were noted, while EG channel parameters (length, width, depth and shape) were measured at each site. Physico-chemical properties of the soils were determined in field and laboratory using prescribed procedures. Soil loss was measured and empirically predicted. Results showed that the soils were heterogeneous and lying on flat to hilly topography with few grasses, shrubs and trees. Soils were mainly sandy with considerable silt and clay contents. The exchangeable K, Ca, Na and Mg contents were low to high. The measured and empirical area of soil loss (ASL) ranged from 168.93 - 597.43 m2 and from 181.80 - 350.32 m2 respectively in 2008, while it was respectively from 70.02 - 426.78 m2 and 158.42 - 437.98 m2 in 2009. The measured volume of soil loss (VSL) ranged from 73.42 - 328.61 m3, while the empirical estimates had lower range of 86.89 - 292.33 m3, respectively in 2008. The VSL also ranged from 90.06 - 311.91 m3, and from 85.43 -346.98 m3 in respect of measured and empirical estimates in 2009. Hence, the measured mass of soil loss (MSL) was 98.78 - 446.33 kg/ac compared to a range of 112.78 - 383.72 kg/ac for empirical estimates in 2008. The MSL was 114.46 - 397.89 kg/ac and 106.82 - 447.11 kg/ac in terms of the actual and empirical erosion in 2009. The measured was generally comparable with the empirical soil loss. Both measured and empirical ASL was higher at Muvur in 2008 and lower at Lamorde and Madanya in 2008 and 2009 respectively. The empirical soil loss was slightly over or under estimated. Future researches are recommended to apply these suitable empirical models as cheaper alternative to field measurement or scarce physically based models in erosion studies in Mubi area.
Authors: *I. J. Tekwa, A.M. Chiroma and E.Z. Apagu
Pages: 1 - 9