A kinematic overland flow model to determine depression storage tilled surfaces

• Published in: Soil & tillage research 1989, Vol.15 (1), p.65-78
• Main Authors: de Lima, J.L.M.P., Eppink, L.A.A.J., Van der Molen, W.H.
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Biological and medical sciences; Fundamental and applied biological sciences. Psychology; Irrigation and Soil and Water Conservation; LABRANZA; LLUVIA; Physical properties; Physics, chemistry, biochemistry and biology of agricultural and forest soils; PLUIE; PROPIEDADES FISICO-QUIMICAS (SUELO); PROPRIETE PHYSICO-CHIMIQUE DU SOL; RAIN; SLOPING LAND; SOIL CHEMICOPHYSICAL PROPERTIES; Soil science; TERRE EN PENTE; TERRENO EN DECLIVE; TILLAGE; TRAVAIL DU SOL; Tropische cultuurtechniek; Water and solute dynamics
• ISSN: 0167-1987; 1879-3444
• DOI: 10.1016/0167-1987(89)90064-0

A method of predicting a spatial average value for depression storage of tilled surfaces is proposed. The method is based on the kinematic flow approximation to overland flow on a plane. In the laboratory, only the aspects of tillage, rainfall intensity and slope were investigated. The following impermeable models, simulating various tillage techniques, were used: plastic corrugations; concrete ridges; contrete mounds; concrete plane surface as reference. The experiments were repeated for each tillage model with different slopes (varying from 0.5 to 4%), and for each slope with different rainfall intensities (varying from 0.009 to 0.109 mm s −1). The method was verified by comparing predicted depression storage with depression storage obtained from water-balance consideration based on the experimental data. It is believed that the model can be used to estimate spatial average depression storag if infiltration is known.