1- Map of the Logan River Watershed
2- Longitudinal Profile
The longitudinal map of the Logan River depicts how elevation changes from the headwaters to the downstream point where the Logan River joins the Little Bear River.
The current day base level control of the Logan River is the Bear River, which is at an approximate elevation of 1344 m.
The knickpoint that occurs around 50,000 m downstream is from a previous base-level control during the Late Pleistocene called Lake Bonneville, which had an approximate elevation of 1,500 m.
The mainstem length of the current day Logan River is 865 km. This was approximated on ARCMap using the 3D Analyst Interpolate Line tool.
The upstream knickpoint is hypothesized to be from a dramatic increase in drainage area and the downstream knickpoint is a remnant feature from past base-level control of Lake Bonneville during the Late Pleistocene.
3- Catchment Morphometrics
The Logan River catchment length is 55.66 km or 55,663 m.
The catchment area is 656.56 square kilometers or 6.57*10^8 square meters.
The catchment perimeter length is 172.34 km or 172340 m.
The catchment circularity ratio: Rc=A/Ac= 0.28, which is a very low value meaning that the catchment is very elongated.
The catchment elongation ratio: Er=A^0.5/L= 0.46, meaning the catchment is very elongated.
The form factor of the catchment: Rf=A/L^2= 0.21.
The catchment relief: H=Emax-Emin= 1122 m.
The catchment relief ratio: Rh=H/L= 0.02.
The drainage density of the Logan River perennial drainage network: total stream lengths/catchment area = 0.20 km/km^2.
The drainage pattern of the Logan River drainage network is dendritic.
4- Stream Order
The stream order of the Logan River at its mouth is 4. This occurs when the Logan River and Temple Fork join.
The stream order of Temple Fork at its mouth is 3.
The stream order of Beaver Creek is 2.
The Logan River does seem to obey the Hortonian laws of stream network composition .
Law of stream numbers - as the stream order number increases, the number of streams of that order decreases - TRUE
Law of stream lengths - as the stream order number increases, the length of the stream of that order increases - TRUE
Law of catchment area - are the stream order increases, the catchment area increases - TRUE
Comments