Spatial lag effects in bed load sediment transport

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Abstract
Spatial lag effects, which are viewed as the inability of an alluvial system to immediately overcome the presence of constrained sediment boundary conditions, are investigated under bed load sediment transport conditions. An equation which characterises spatial lag effects and two theoretical spatial lag coefficient relations are investigated experimentally. Values of the spatial lag coefficient obtained from experimental data are compared with the theoretical relations and one relation is recommended. A numerical model which incorporates the spatial lag equation is formulated. The performance of the model is tested against data measured by a previous investigator and the ability of the model to successfully predict the spatial and temporal variation of the mean bed elevation and bed load transport rate under steady flow, non-equilibrium conditions is verified.

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