Automated Measurement for Sensitivity Analysis of Runoff-Sediment Load at Varying Surface Gradients
Journal Title: Analele Universitatii "Eftimie Murgu" Resita. Fascicula de Inginerie - Year 2015, Vol 22, Issue 1
Abstract
Direct measurement of surface runoff is often associated with errors and inaccuracies which results to unreliable hydrological data. An automatic Runoff-meter using tipping buckets arrangement calibrated to tip 0.14 liter of runoff water per tip with an accuracy of 0.001 litre was used to measure surface runoff from a steel bounded soil tray of dimension (1200 mm X 900 mm X 260 mm) filled with sand loamy to the depth of 130 mm and inclined at angle (00, 50 ,120 and 150) horizontal to the instrument. The effect of varying angles of inclination on runoff intensity, sediment loss rate and sediment loss is significant at 5 % confidence level, while surface runoff is not significant at 5 % confidence level. Total highest sediment loss of 458.2 g and 313.4 g were observed at angle 150 and 120 respectively. Total surface runoff of 361.5 mm and 445.8 mm were generated at inclined angle of 00 and 50, while at angle 120 and 150, 564.3 mm and 590.0 mm of surface runoff were generated. In addition, runoff intensity and sediment loss rate were highest at angle 150, while the lowest values of 1.5mm/min and 5.43 g/min were obtained at angle of inclination 50. The results showed that strong relationship existed among the hydrological variables as a result of subjecting the steel bounded soil tray to different angles of inclination. Such results would provide useful data for the running of physics-based deterministic model of surface runoff and erosion which will be useful for the design of hydrological structures, land use planning and management.
Authors and Affiliations
P. A. Imanogor, Ovibiagele Umahon, M. E. Ugbodaga, A. O. Omholua
Keywords
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