The River-Oil-Spill Analyser
ROSA is a special purpose interface
to the PHOENICS CFD code.
It is an integrated software package for simulating the development of oil
slicks and other spillages.
It has been validated against a number of hydraulic models and full scale river
spillages, especially in Siberia where environmental concerns have become a major issue.
All the relevant physical phenomena (wind strength and direction, temperature,
etc.) are taken into account.
applicability of ROSA
When oil (or other chemicals/pollutants) is spilled into a river we would wish to:
- predict water quality in terms of pollutant concentration over time and space
- in the short-term, predict slick movements and formulate an emergency response
- in the long-term, predict deposition of pollutant and formulate a management and
Modelling features of ROSA
ROSA comprises the following modules linked by a menu system:
- The river-current sub-models
- The oil-spill sub-models
- The data-entry module
- The visualisation module
Oil pollutants within the river are considered as consisting of:
- A surface slick floating on the water surface
- A mixed layer containing suspended oil fragments
- There is continuous exchange between the two layers and mass losses to the
- The surface layer thickness is much less than that of the suspended layer which
is equal to the flow depth
ROSA has been validated against a number of reliable laboratory and field
measurements of velocity field and free surface elevations in two and three dimensions for
open channels and river courses.
Free-surface flows in open channels
A number of free-surface flows have been simulated and validated against
experimental data, including:
- flow in open turnaround channel,
- abrupt open channel expansion,
- flow impingement on bluff body,
- merging of streams,
- flows in channels with complex bed shapes and
- meandering open channel flows.
Good agreement has been achieved both for free surface elevation and velocity
- ROSA is a modelling tool capable of simulating movement of oil and other
pollutants on the surface of rivers, which flow at a constant rate.
- It has recently been extended, adding the capability to simulate flows that vary
with time, i.e. tidal flows.
- This enables ROSA to be used to simulate the movement of oil in estuaries, along
coastlines and on the open sea, greatly enhancing the usefulness of ROSA as a tool for
predicting the spread of oil slicks.
- A further ROSA capability is the ability to simulate the movement of ice flows on
|For further information about
ROSA, licence arrangements, consultancy, seminars and courses, and more specifically what
it can do for you, contact CHAM.
Concentration, Heat & Momentum Ltd
Bakery House, 40 High Street
Wimbledon Village, London SW19 5AU
Tel: +44 208 947 7651
Fax: +44 208 879 3497
© Copyright 1999 CHAM Ltd.