ACARP ACARP ACARP ACARP
Open Cut

Use of Meteorological Models to Predict Dust Risk Indices for Mining Areas in the Hunter Valley

Open Cut » Environment

Published: January 12Project Number: C19034

Get ReportAuthor: Nigel Holmes | NH2 Dispersion Sciences

The first part of the study investigates the use of meteorological forecast models (the MM5 model) to provide short term (24 to 36 hour) predictions of a relative dust risk index (see later).  The study area covers those parts of the Hunter Valley where open cut mining takes place.  A second part of the study has used meteorological models to predict the transport of dust emissions for short periods (24 to 36 hours) into the future.

 

The dust risk index is a function of space and time.  It is approximately proportional to the rate at which wind erosion dust is expected to be generated.  It is provided as a series of coloured contour figures showing the forecast index at a grid of 500 m by 500 m cells covering the study domain. The predictions are provided on an hourly basis for the upcoming forecast period (currently 24 hours).

 

The study provides a review of the behaviour of particles in the atmosphere and the physical processes involved in wind erosion and various models for estimating the rate of dust generation due to wind erosion.  The purpose of the review is to identify an appropriate method for estimating the dust risk index and to ensure that the meteorological and other parameters required to estimate it are available from the metrological model and other data available to us.

 

The primary cause of dust emissions is not the direct action of the wind on small particles (sub-60 µm).  The cohesive forces binding particles in this size range to the surface are too strong to be overcome by the aerodynamic forces that the wind can exert on these particles.  During wind erosion, particles are liberated from the surface to the atmosphere by collisions of larger particles with sizes of the order of 800 µm.  These sand-sized particles have sufficient cross-sectional areas projecting into the wind and have sufficiently small masses to be able to be mobilised by the wind.  Thus the key to estimating the rate at which wind erosion dust is generated is to quantify the horizontal flux of soil.  This is proportional to the rate at which dust is generated by the wind.

 

The basic equation selected to estimate soil flux is based on work by Draxler (WRAP, 2006).  This relates the soil flux to the friction velocity associated with wind gusts and threshold friction velocity required to mobilise particles on particular surfaces (e.g. exposed mining land, forest/woodland, grazing area etc.).  Most wind erosion is associated with brief periods of high wind speed (i.e. with the speeds associated with wind gusts).  Developing a method of estimating the strength of wind gusts and associated friction velocity was an important part of the study.

 

The final part of the study has involved work by SKM to predict dust concentrations by modelling the dispersion of dust.  The approach adopted makes use of the CSIRO's TAPM model, which is used in conjunction with the CSIRO's Cubic Conformal Atmospheric Model (CCAM).  CCAM serves the same role as MM5 and is used in place of the MM5 to provide a forecast of the upcoming meteorological conditions.  The model uses estimated dust emissions based on published data from Environmental Impact Statements (EISs).  The results are published to a web site as hourly contour plots showing forecast PM10 concentration over the study domain.

 

A brief comparison between the predicted 24-hour average PM10 concentration at Muswellbrook and Singleton shows if the concentrations are categorised into six categories then in the majority of cases the predicted value and the observed value will lie within one category.

 

Overall both components of the study provide additional tools that should enable the management of dust from mining in the Hunter Valley to be improved.  The full usefulness of the tools will depend on the ability to proactively make use of the forecasts to reduce emissions when required.  This will not be a simple task.

An e-newsletter has also been published for this project, highlighting its significance for the industry.

Underground

Health and safety, productivity and environment initiatives.

Recently Completed Projects

C34007Evaluating Toxicity Of Different Types Of Respirable Crystalline Silica Particles To Lung Cells And Tissues

Silica dust represents one of the most significant occupational haza...

C29010In-Situ Stress Measurement Using Non-Destructive Techniques (Ndts)

Rock in depth is subjected to stresses due to overlaying burden and ...

C33029Review Longwall Face Ventilation To Mitigate Goaf Gas Emissions Onto Walkways And Tailgate End

As longwall mining increasingly targets deeper coal seams, managing ...

Underground

Open Cut

Safety, productivity and the right to operate are priorities for open cut mine research.

Recently Completed Projects

C35029Renewable Energy As Post-Mining Land Use

In 2020, the Queensland Resources Council (QRC), in partnership with...

C33036Radar Tyre Monitor System

This project focussed on trialling a radar sensing technology design...

C26020Preventing Fatigue Cracking Via Proactive Surface Dressing

Fatigue cracking of plant and equipment presents a significant chall...

Open Cut

Coal Preparation

Maximising throughput and yield while minimising costs and emissions.

Recently Completed Projects

C28061Quantitative Based Structural Integrity Evaluations Using Modal Parameters Estimation

This project focused on the development and implementation of a quan...

C34039Development Of A Soft Sensor For Predicting Dense Medium Cyclones Performance

This project details the development of a DMC soft sensor for modell...

C34041A Coal Spiral For The 2020S

The objective of this project is to develop an enhanced coal process...

Coal Preparation

Technical Market Support

Market acceptance and emphasising the advantages of Australian coals.

Recently Completed Projects

C35039Impact Of Coal Grain Composition And Macerals Association On Fluidity Development In Australian Coals

The coke quality prediction models use thermoplastic terms as key ex...

C36004Physical And Chemical Structure Characterisation Of Biomass For Biocoke Production

Partial substitution of coking coal with renewable biomass is identi...

C35037Examination Of Contraction Pre And Post Resolidification Using A High Temperature Dilatation Rig

This project examined the contraction of coking coal samples, both p...

Technical Market Support

Mine Site Greenhouse Gas Mitigation

Mitigating greenhouse gas emissions from the production of coal.

Recently Completed Projects

C34066Safe Operation Of Catalytic Reactors For The Oxidation Of VAM Operating Under Abnormal Reaction Conditions

The catalyst Pd/TS-1 has shown excellent activity in oxidising venti...

C28076Selective Absorption Of Methane By Ionic Liquids (SAMIL)

This third and final stage of this project was the culmination of a ...

C29069Low-Cost Catalyst Materials For Effective VAM Catalytic Oxidation

Application of ventilation air methane (VAM) thermal oxidiser requir...

Mine Site Greenhouse Gas Mitigation

Low Emission Coal Use

Step-change technologies aimed at reducing greenhouse gas emissions.

Recently Completed Projects

C17060BGasification Of Australian Coals

Four Australian coals were trialled in the Siemens 5 MWth pilot scale ga...

C17060AOxyfuel Technology For Carbon Capture And Storage Critical Clean Coal Technology - Interim Support

The status of oxy-fuel technology for first-generation plant is indicate...

C18007Review Of Underground Coal Gasification

This report consists of a broad review of underground coal gasification,...

Low Emission Coal Use

Mining And The Community

The relationship between mines and the local community.

Recently Completed Projects

C16027Assessing Housing And Labour Market Impacts Of Mining Developments In Bowen Basin Communities

The focus of this ACARP-funded project has been to identify a number...

C22029Understanding And Managing Cumulative Impacts Of Coal Mining And Other Land Uses In Regions With Diversified Economies

The coal industry operates in the context of competing land-uses that sh...

C23016Approval And Planning Assessment Of Black Coal Mines In NSW And Qld: A Review Of Economic Assessment Techniques

This reports on issues surrounding economic assessment and analysis ...

Mining And The Community

NERDDC

National Energy Research,Development & Demonstration Council (NERDDC) reports - pre 1992.

Recently Completed Projects

1609-C1609Self Heating of Spoil Piles from Open Cut Coal Mines

Self Heating of Spoil Piles from Open Cut Coal Mines

1301-C1301Stress Control Methods for Optimised Development...

Stress Control Methods for Optimised Development and Extraction Operations

0033-C1356Commissioned Report: Australian Thermal Coals...

Commissioned Report: Australian Thermal Coals - An Industry Handbook

NERDDC