Catchment-Scale Controls on River Geomorphology
Embedded Files
1 - Map of Logan River Watershed
Where in Utah is the Logan River Watershed Figure 1.1
Logan River Watershed outlined (a 10 digit HUC - 1601020303) Figure 1.2
2 - Longitudinal Profile
Longitudinal profile of the Logan River Figure 2.1
The base level of the Logan River today is 1344 meters. The base-level control Is where the Logan River transitions into the Little Bear River.
The base-level control of the Logan River about 18,000 years ago was around 1,500 meters which were approximately Lake Bonneville shoreline.
The length of the mainstem is 82.3 km of the Logan River
Figure 2.2
Pederson (2021) Figure 2.3
Figure 2.4
Knickpoints and Hypothesis
Stream Mill knickpoint was probably caused by a fault because when there is a base level change the river wants to erode to the lowest point it can which is the fault in this case.
The Cottonwood knickpoint corresponds with the bedrock changes. It goes from the garden city to swan peak quartzite to dolomite. Quartzite is very resistant compared to dolomite which is not as strong and the top two highest unit stream power peaks correspond with swan peak quartzite.
First, Second and Third dam knickpoint is caused by the dam but the knickzone is probably caused by a fault further downstream contributing to the higher unit stream power after the dam.
3 - Catchment Morphometrics
Catchemnt Length: 47,118.85 meters & 47.11885 km
Catchment Area: 646.56 km^2 & 646,560,000 m^2
Catchment Perimeter Length: 161,908 m & 161.908 km
Circularity Ratio: 0.31
Elongation Ratio: 0.16
Form Factor: 0.02
Catchment Relief: 1,119 m
Relief Ratio: 6.91
Drainage Density drainage density of the Logan River perennial drainage network: 0.25
Drainage Pattern: Dendritic
Calculations Figure 3.1
4. Stream Order
Stream order of Temple Fork at its mouth. Temple Fork has a stream power of three. (Figure 4.1)
Stream order of the Logan River at its mouth. Green is 1, Yellow is 2, Orange is 3, and red is 4. Logan has a stream power of four. (Figure 4.3)
Stream order of Beaver Creek. Beaver Creek has a stream power of two. (Figure 4.2)
Does the Logan River appear to obey the Hortonian laws of stream network composition?
Logan River stream order increased going downstream while the number of streams decreased. The second law doesn’t match very well to the Logan River because the first streams are relatively long compared to bigger order streams. I believe that the catchment area would increase smoothly with stream order progression.
Methods
I use Google Earth Pro and the LoganRiverWatershedPrepped.kmz file for all of my maps and I used Adobe Photoshop for picture annotations.
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