## Characteristic Numbers of Tracer Transport (independent of tides)

### From BAWiki

## Contents

## Motivation

Computation as well as visualization of the tide independent characteristic numbers of tracer transport (volume flux) gives some insight into the

- local change of tracer (volume flux),
- mean volume flux of tracer due to horizontal advection,
- mean colume flux of tracer due to horizontal diffusion, as well as the
- volume flux due to tracer sources and sinks

within the period of data analysis.

From these, conclusions can be drawn on the mean (residual) tracer transport , and i. e. the relative significance of advection versus diffusion. For estuaries, fresh water flow, bathymetry, as well as wind shear are considered to be the main influencing factors. Beyond that, the following non-linearities are also of some significance: nonlinear propagation speed of the tidal wave, bottom friction and advection.

## Definitions for the tide-independent characteristic numbers of tracer transport

**An automatic analysis is carried through by the computer program NCANALYSE.**

### Divergence of Horizontal Tracer Transport

(Mean) volume flux (m3 s-1) due to horizontal divergence within the period of analysis for all computational cells (control volumes).

*No example graphics available yet*.

Data analysis: NCANALYSE.

### Horizontal Flux due to Advection

(Mean) volume flux (m3 s-1) due to horizontal advection for the period of analysis at computational edges (lateral faces of control volumes).

*No example graphics available yet*.

Data analysis: NCANALYSE.

### Horizontal Flux due to Diffusion

(Mean) volume flux (m3 s-1) due to horizontal diffusion for the period of analysis at computational edges (lateral faces of control volumes).

*No example graphics available yet*.

Data analysis: NCANALYSE.

### Sources and Sinks

(Mean) volume flux (m3 s-1) within the period of analysis due to sources and sinks within computational cells (control volumes).

*No example graphics available yet*.

Data analysis: NCANALYSE.

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