A model of the vertical distribution of suspended sediment in the bottom layer of a natural water body

被引：5

作者：

Heinloo, Jaak ^{[1
]}

Toompuu, Aleksander ^{[1
]}

机构：

[1] Tallinn Univ Technol, Marine Syst Inst, EE-12618 Tallinn, Estonia

来源：

ESTONIAN JOURNAL OF EARTH SCIENCES | 2010年 / 59卷 / 03期

关键词：

turbulent diffusion; bottom Ekman layer; suspended sediments; bottom mixed layer; vertical profiles; modelling; TURBULENT-FLOW; OPEN-CHANNEL; SEA; ESTUARY;

D O I：

10.3176/earth.2010.3.05

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

The paper suggests a stationary model of the vertical distribution of the concentration of suspended sediment in the bottom layer of a natural water body with a flat bottom. The model explains the concentration distribution, formed jointly by the settling of suspended particles and turbulent diffusion. The flow is assumed geostrophic above the bottom-influenced layer, while in the bottom layer the effect of turbulent diffusion by the large-scale turbulence constituent is assumed to dominate over the diffusion effect caused by the small-scale turbulence constituent. It is shown that for the characteristic diffusion length scale of the eddies much smaller than the height of the Ekman bottom boundary layer the model results in an analytic expression for the vertical distribution of the concentration of suspended sediment, which includes also the case with the presence of the lutocline. The model outcome is compared with the results of a laboratory experiment with sand-injected flume flow.

引用

页码：238 / 245

页数：8