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The photos above show the surveys taken in 2003 (first photo), 2004(second photo), and 2005(third photo).
Introduction
In this module, a GCD Project was created to observe changes within the River Freshie located in Scottish Cairngorm Mountains (57°00'41.4"N 3°54'16.1"W). I created this GCD Project in ArcMap by downloading the surveys provided. As you can see from images and change detections there are changes from year to year. I decided to look at the changes between the years 2003-2004 and 2004-2005.
Methods
For this project I had to download the GCD add in for ArcMap to be able to capture the changes between the 2003, 2004 and 2005 surveys. When I was able to download the data onto the new GCD project the first thing I did was download the 2003, 2004, and 2005 surveys. Just from the surveys I was able to see changes within the reach. An error surface was applied to each survey. Using both the error surface and survey I was able to produce a change detection between 2003-2004 and 2004-2005. From there I inserted polygons around areas I saw bar development, aggradation, degradation, and bank erosion. To determine these mechanisms, I looked what was happening in the polygons by using the Effects bar. Once I had all of the polygons in place, I was able show Budget Segregation. The graphical results were provided to me once I applied Budget Segregation.The graphical results provided look at the relative vertical averages in volume.
2003-2004 GCD Results
Between the years 2003-2004 we were able to detect a few changes within River Freshie. Higher up in the reach there was examples of degradation and bank erosion. The threshold value for Degradation had a total volume of the surface lowering (m3) of 90.8. The threshold value for Bank erosion had a total volume of surface lowering (m3) of 152.14. Lower in the reach shown examples bar development and aggradation. The threshold value for bar development had a total volume of surface rising (m3) of 208.86. The threshold value for aggradation had a total volume of surface rising (m3) of 111.47. Based off the polygons there was more bar development than bank erosion. There was more aggradation than degradation.
2004-2005 GCD Results
A lot of changes were detected between the years 2004-2005. There were more changes in years 2004-2005 than 2003-2004, I could have pulled multiple examples of degradation, bank erosion, bar development, and aggradation. The threshold value for Degradation had a total volume of the surface lowering (m3) of 634.44. The threshold value for Bank erosion had a total volume of surface lowering (m3) of 330.75. The threshold value for bar development had a total volume of surface rising (m3) of 574.55. The threshold value for aggradation had a total volume of surface rising (m3) of 429.21.
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