Accelerated erosion

About accelerated erosion

The Wind Erosion Histories project has successfully discriminated accelerated erosion within wind erosion source regions by calculating a climate-adjusted erosion rate (DEDc-a) (i.e. normalising erosion rates for climate at each station) using the following equation:

DEDca = Dust / Climate      [1]

DEDca = DED / (Bare Ground x Wind Speed)      [2]

 

Where:
DED = Dust Event Days (per month)
DEDca = Climate-adjusted DED
Bare Ground = Percentage of 50 km area around a station with pixels 30-100% bare (referred to in text as 0-70% vegetation cover).
Wind speed = Number of 6-hourly NCEP model runs per month with Max wind speed exceeding the texture-driven wind speed thresholds of 5 m/s (Sands) and 8.9 m/s (all others); expressed as a percentage of the total number of 6-hourly NCEP runs made by the CEMSYS model for the same month (e.g. if the maximum wind speed value for a pixel is greater than the texture-driven thresholds for 60 of the 120 6-hourly runs in a 30-day month, the pixel value is 50%).  

 

This analysis was performed within a GIS-based spatial analysis framework. Climate-adjusting erosion is based upon the rationale that if a station is eroding at a higher rate than the climatic conditions predict (i.e. vegetation cover [reflecting rainfall] and wind speed), then this must be due to the influence the land use and management, the other main erosion rate driver; have on the erosion rate.

Assistance in decision-making

We have tools and information available to assist land managers with decision-making. All material in Wind Erosion Histories is designed for you to use in land management planning, to make the best decisions possible.

Browse data

The following galleries contain maps which can help pinpoint areas of concern - areas which are at risk of having an accelerated rate of wind erosion.

Click the thumbnail to open the gallery

Browse the maps using the controls (play, next, etc)

 

Dust Event Days

National maps showing monthly total number of dust event days (DED). A DED is a day during which at least one dust event was observed.
Time period: Monthly, January 2000 to December 2012.

Click the thumbnail to open the gallery, and use the controls to browse maps.

 

 

 

 

Dust Event Days (Climate Adjusted)

National maps showing monthly total number of dust event days (DED), with data that has been Climate Adjusted. A DED is a day during which at least one dust event was observed.
Time period: Monthly, February 2000 to June 2011.

Click the thumbnail to open the gallery, and use the controls to browse maps.

 

 

 

 

Wind erosion

Click the thumbnail to open the gallery, and use the controls to browse maps.

 

Read 9109 times Last modified on Tuesday, 11 June 2013 15:25