The area chosen for study is in Coffey County, in the southeastern area of Kansas, USA. The two water bodies chosen for study were John Redmond Reservoir and Coffey County Lake. The purpose of the project is to compare the amount of suspended and non-suspended sediments in the two lakes. As I have been to these lakes personally, I know that I should expect John Redmond Reservoir to have more suspended sediments. As I choose to use Landsat 4-5 TM (Thematic Mapper) images, I was also able to do a temperature analysis between the lakes.
Image of Kansas. Coffey County is circled. (USCB, 2011)
Coffey County Map. The image shows the major towns within the county, as well as the lakes to be analyzed.
Aerial Image of Lakes. Aerial image of the area for analysis. John Redmond Reservoir to the left and Coffey County Lake to the right. (TerraMetrics, 2011)Return to top of page.
John Redmond Reservoir was authorized to be build May 17, 1950 and completed in September of 1964. It was built with the purpose of flood control, water supply, and recreation (Corps of Engineers, nd). Redmond covers 9,400 acres of land. It is 2 miles north and 1/2 mile west of Burlington, KS ( Coffey County - Parks, nd).
Coffey County Lake was originally built to be the cooling lake for Wolf Creek Power Generation Plant. In 1998, Wolf Creek handed over management of the public use areas to the Coffey County Sheriff's Department (Coffey County - Sherriff, nd), but it is still used as a cooling lake. This lake is 2 miles north and 1 mile east of Burlington, KS. Coffey County Lake takes up 5,090 acres of land (Coffey County - Parks, nd).
These 2 lakes, measuring from the center of John Redmond Reservoir to the center of Coffey County Lake, are approximately 9.3 km apart. The lakes are also separated by US 75 Highway.
Image of the dam at John Redmond Reservoir. (Corps of Engineers, nd).Return to top of page.
The first step of this project was to pick a topic. I wanted to do something dealing with sedimentation and filling in of reservoirs in the Neosho Basin. It was suggested to me that I look at the differences between John Redmond Reservoir and Coffey County Lake. Next, I decided that I wanted to look at different years, with a span of 20 years. I chose to look at October 1991 and 2011. When I picked these years, I was looking at GLOVIS and chose the years and months based on the location and 20% cloud cover. The Landsat 4-5 TM files were then downloaded. 7-zip was then used to extract the files that had been compressed. After this was done, I added these images to Idrisi Taiga . With Idrisi I was able to look at the individual Landsat bands, make composites, and do analyses.
Left: Band 2 for 1991. Middle: Band 5 for 1991. Right: Band 7 for 1991.
Sample 1991 images for bands used in analysis. Band 1 shows color difference between Redmond and Coffey County Lake.
Left: Band 1 for 2011. Middle: band 3 for 2011. Right: Band 4 for 2011.
Sample 2011 images for bands used in analysis. Seen in bands 3 and 4, there are coloration difference between John Redmond on the left and Coffey County Lake on the right.
After the bands were placed into Idrisi, several different composites were made. I then made an overlay of bands 3 and 1. I used this overlay to make a special composition, using RGB=24Special. A cluster was then made using bands 1 through 4. A RECLASS was done and a group was made. From the group, an attribute table was created to run the ASSIGN function to produce an image that only had 3 layers. From this last image, an AREA function was ran to give the area as km². The images were then saved, converted to JPEG files and placed in the webpage to be analyzed.
The below images are the single bands or composites that were made for this project. For all of the before and after images, the before is the 1991 image and the after is the 2011 image.
The bands used were RGB=143. In this image, the green shows vegetation, blue shows water, and red and yellow shows barren land. While this image and the one below do not show the sediment in the lakes, they do help show the vegetation in the surrounding area.
The bands used were RGB=547. The black shows water; pinks and purples show thick vegetation, with the blues showing vegetation; and the greens show barren land.
This image is of the thermal band (band 6) from Thematic Mapper. Blues show the coolest temperatures, where the reds and yellows show the warmest temperatures. In the 1991 image, we see that Redmond has some blue along the northwest edge and the rest is a dark green. This shows that the Reservoir is relatively cool compared to the surrounding area. Coffey County Lake, from the north to the south, starts with the dark green and becomes lighter green. This shows that the lake is cooler on the north than the south.
In the 2011 image, it is seen that Coffey County Lake is much warmer than John Redmond Reservoir. The black dot next to Coffey County Lake is the approximate location of the containment dome of Wolf Creek Power Plant. John Redmond Reservoir looks to be warmer as well, but still cooler than Coffey County Lake.
Bands used were RGB=132. John Redmond Reservoir, on the left, has an intense cloudy look to the water. Coffey County Lake is black in the 1991 image and blue in the 2011 image. This color differences in the lakes, shows the differing amount of sediment in the lakes. The cloudiness would indicate more suspended sediment in the lake.
The bands used were RGB= 2 4 3/1 special composite. This is the first composite image to find a sediment difference in the lakes. Redmond is shown as a purple color (suspended sediments) and Coffey County Lake is shown as black (little to no suspended sediments).
In the 2011 image, the edges of Coffey County Lake are showing blue/purple, instead of solid black from 1991, showing that there are suspended sediments in the water.
The 1991 image has 8 clusters, whereas the 2011 image only has 7 clusters. With the 1991 cluster, Redmond Reservoir is in clusters 4 and 6 and Coffey County Lake is only in cluster 3. The 2011 cluster has Redmond in cluster 4 and Coffey County Lake in cluster 5.
These images show that the lakes are differing greatly when grouped by Idrisi. These images show suspended sediment changes how the Landsat bands view suspended sediment differently than mostly clear water.
John Redmond Reservoir is shown as a creamy white and Coffey County Lake is shown as red. This image was used to determine area of the water. From the 1991 image, John Redmond Reservoir was 29.4 km² and Coffey County Lake was 17.1 km². From the 2011 image, Redmond is 27.7 km² and Coffey County Lake is 19.5 km².
John Redmond Reservoir and Coffey County Lake are both located closely to Burlington, Kansas. From the analysis of the Landsat bands, downloaded from Glovis, there is a difference in suspended sediments, as well as temperature. Idrisi was used to process the images. Several images were created to show these differences. In all the images made, John Redmond Reservoir seems smaller, especially along the north and west edges. When running the area function, the area of Redmond did drop by 1.7 km², but Coffey County Lake gained 2.4 km².