Embedded Files
Map of Logan River Watershed
This interactive map of the Logan River watershed displays a polygon to help navigation and blue markings to indicate the knickpoints.
The first picture is First Dam, second is Second Dam, third is Third Dam, and the fourth is beaver dams/timber harvest. All of these images are considered to be knickpoints within the Logan River watershed.
Figure 1. Shows a longitudinal profile graph of the Logan River.
Longitudinal Profile
The base level control today is Salt Lake, but the base level control 18,000 years ago was Lake Bonneville. The mainstream length of Logan River is 86.36 kilometers. The concavity of the Logan River is 1.27 feet. The knickpoints are challenging to see on the longitudinal graph, but there is one from 21 miles to about 27 miles. I believe is because of the three dams put in place along the reach. There is another knickpoint around 46. 7 miles to about 48 miles. When I zoomed in on the area it look like there was a lot of fallen timber and beaver dams along this reach.
Catchment Morphometrics
Catchment Length (m): 98,160.77 meters
Catchment Area (m2): 646,560,000 square meters
Catchment Area (km2): 646.56 square kilometers
Circularity Ratio:
Elongation Ratio: 0.26, a low ratio means the catchment is very elongated.
Form Factor: 0.07
Catchment Relief: 3,679 ft.
Relief Ratio: 11.42
Drainage Density:
Drainage Pattern: Dendritic
Horton's Three Laws
Law of Stream Numbers: As stream order increases the number of streams decrease.
Law of Stream Lengths: As stream order increases, stream length increases.
Law of Catchment Area: The catchment area increases smoothly given the stream order.
The Logan River watershed seems to obey all of Horton's Three Laws. The stream order increases as the number of streams decrease. The stream lengths increase as stream order increases. I would say the catchment area increases smoothly given its stream order.
Figure. 2 Shows the stream order of the Logan River watershed. The stream order of the Logan River at its mouth was 4. The stream order of Temple Fork at its mouth was 3. Lastly the stream order for Beaver Creek was 2.
Methods
This lab was super challenging because I am not to familiar with Google Earth or USGS. I found it easier to use My Maps and Google Earth. I made my interactive map in My Maps and labeled what I thought were knickpoints. I added the polygon to make it a little bit easier to navigate the watershed. I was able to get the longitutial profile graph from Google Earth. From the graph I was able to pull out the concavity of the watershed. For catchment morphometrics I pulled data from both maps and used the formulas provided to use in the books. I wasn't able to find the circularity ratio because I didn't know how to draw a circle polygon to match the watershed circumference. I was also confused on how to find drainage density, To find the stream order of the watershed I was able to trace the KMZ file in My Maps. From there I determined the stream order of the Logan River, Temple Fork, and Beaver Creek.
Page updated
Google Sites
Report abuse