caa a22 4500 60545566X CHVBK 20210128100213.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s10872-014-0269-x doi (NATIONALLICENCE)springer-10.1007/s10872-014-0269-x On the factors affecting the settling velocity of fine suspended sediments in a shallow estuary [Elektronische Daten] [K. Priya, P. Jegathambal, E. James] Of the factors that affect settling velocity (w s), the concentration of suspended sediments (SSC), C, and turbulence (root-mean-square velocity gradient), G, have been identified as being of major importance. This work reveals the important effect on w s of the vertical salinity gradient, s, (defined as the difference between surface and bottom salinity divided by water depth). w s was obtained by use of the Rouse equation, and ranged between 0.1 and 2.47mm/s. w s was found to have an exponential relationship with SSC for low SSC; an inverse relationship was observed for high SSC, because of hindered settling. The study revealed that w s was inversely related to s and its effect was observed only for high values of s. A new model is proposed in which w s is explained in terms of C, G, and s. Two scenarios were considered on the basis of the stratification parameter ∂S/S 0 (the ratio of the difference between the surface and bottom salinity divided by the mean salinity): ∂S/S 0>0.1 and ∂S/S 0<0.1. The effect of s on w s was negligible when ∂S/S 0<0.1. Regression analysis was performed on observed w s (using the Rouse equation) and calculated w s using three approaches: (1) $$w_\text{s} \propto \,C^{x}$$ w s ∝ C x , (2) $$w_\text{s} \propto \,C^{x} G^{y}$$ w s ∝ C x G y , and (3) the new model $$w_\text{s} \propto \,C^{x} G^{y} s^{ - z} , {\text{for}}$$ w s ∝ C x G y s - z , for ∂S/S 0>0.1, and coefficients of determination of 0.59, 0.65, and 0.86 respectively were obtained. The new model has the advantage that it is dimensionally stable and the empirical coefficient is dimensionless. The Oceanographic Society of Japan and Springer Japan, 2015 Settling velocity nationallicence SS concentration nationallicence Turbulence nationallicence Salinity gradient nationallicence Stratification parameter nationallicence Muthupet estuary, India nationallicence Priya K. School of Civil Engineering, Karunya University, Coimbatore, India aut Jegathambal P. Water Institute, Karunya University, Coimbatore, India aut James E. Water Institute, Karunya University, Coimbatore, India aut Journal of Oceanography Springer Japan 71/2(2015-04-01), 163-175 0916-8370 71:2<163 2015 71 10872 https://doi.org/10.1007/s10872-014-0269-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10872-014-0269-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Priya K. School of Civil Engineering, Karunya University, Coimbatore, India aut NATIONALLICENCE 700 1- Jegathambal P. Water Institute, Karunya University, Coimbatore, India aut NATIONALLICENCE 700 1- James E. Water Institute, Karunya University, Coimbatore, India aut NATIONALLICENCE 773 0- Journal of Oceanography Springer Japan 71/2(2015-04-01), 163-175 0916-8370 71:2<163 2015 71 10872