Transport characteristics of fine sediments from an on-stream stormwater management pond

Abstract

Transport characteristics of fine sediment deposited in an on-stream stormwater management pond were studied in a rotating circular flume. In deposition experiments, the critical shear stress for deposition $\text{(τ}{}_{\mathrm{<mtext>cd</mtext>}}\text{=0.050}\text{N}\text{/}\text{m}{}^2\text{)}$ and the amount of sediment that would stay in suspension permanently were established. For two consolidation periods, 41 and 138 h, respectively, the critical shear stress for erosion of the surface sediment layer was estimated as $\text{0.12}\text{N}\text{/}\text{m}{}^2$. Finally, empirical relationships were developed to estimate the sediment deposition and erosion as a function of bed-shear stress and recommended for future modelling of fine sediment transport in the pond studied.