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North Fork Asotin Creek
These two sites are located within a watershed between three states: Oregon, Washington, and Idaho. Fish site 4 is located in Washington and is managed by the State. Fish site 6 is located also located in Washington, but is managed by the US Forest Service. Both of the reaches are found fairly high up in the watershed.
North Fork Asotin F4
2.1
The in-channel geomorphology is simple and straight. It seems to be single-thread and does not really have anything interesting happening.
2.2
I chose the years 2011 and 2017 because I wanted to see the changes of the various geomorphic units within the six years and see if GUT would classify areas the same or different.
2.3
In 2011, the Tier 2 Forms present were bowl transition, mound transition, bowl, plane, trough, mound, and wall. The Tier 2 Forms present in 2017 were the same. They did not differ much.
2.4
Troughs seem to be dominant in both survey years, but could possibly change over time.
2.5
In 2011, the Tier 3 Units present are banks, barface, glide-run, margin attached bar, mid-channel bar, pocket pool, pool, rapid, and transition. The 2017 survey had the same Tier 3 Units other than the change from rapids to riffles.
2.6
It seems to make sense other than the fast change between a rapid to a glide-run. One area looked like it could be a possible cascade.
2.7A1
The geomorphic unit forcing is structurally forced by the rapid.
2.7A2
The geomorphic unit orientation is streamwise, meaning it is parallel to the flow.
2.7A3
The geomorphic unit position is mid-channel, located in the middle of the stream.
2.7A4
The geomorphic unit low flow water surface slope is moderate based on the Water Surface DEM.
2.7A5
The geomorphic unit low flow relative roughness is low and not obstructed by the substrate.
2.7A6
Based on the five attributes the Tier 3 specific morphology is a structurally-forced pool.
2.7A7
Geomorphic unit forcing is the key attribute for discriminating what it is given the shape of a pool.
2.7A8
GUT does not capture the whole shape of the pool.
2.7B1
The geomorphic unit forcing type is planform, created on the inside bend.
2.7B2
The geomorphic unit orientation is streamwise, parallel to the flow.
2.7B3
The geomorphic unit position is bank-attached.
2.7B4
The geomorphic unit low flow water surface slope along the whole bar is relatively shallow.
2.7B5
The geomorphic unit low flow relative roughness is moderate
2.7B6
Based on the five attributes the Tier 3 specific morphology is a point bar.
2.7B7
Geomorphic forcing, position, and orientation are the key attributes for discriminating what Tier 3 unit it is.
2.7B8
GUT doesn't capture what I consider the base of the bar. GUT classifies it as a margin attached bar
2.7C1
The geomorphic unit forcing is not forced.
2.7C2
The geomorphic unit orientation is streamwise, meaning it is parallel to the flow.
2.7C3
The geomorphic unit position is side-channel, located on left side of the stream.
2.7C4
The geomorphic unit low flow water surface slope is shallow.
2.7C5
The geomorphic unit low flow relative roughness is low and not obstructed by the substrate.
2.7C6
Based on the five attributes the Tier 3 specific morphology is a glide.
2.7C7
Geomorphic unit relative roughness and low flow water surface slope are the key attributes for discriminating what Tier 3 unit it is.
2.7C8
I don’t notice any differences with GUT.
2.8A
In this pool, there is concavity and has the shape of a bowl.
2.8B
GUT did not classify the entire pool. The pool was bigger than what GUT shown.
2.8C
GUT identified the geomorphic unit correctly, just didn’t contain what I think is the entire pool.
North Fork Asotin F6
3.1
The in-channel geomorphology is more complex and sinuous than fish site 4. It seems to have multiple threads and has a lot more going on then fish site 4
3.2
I chose the years 2011 and 2017 because I wanted to see the changes of the various geomorphic units within the six years and see if GUT would classify areas the same or different.
3.3
In 2011, the Tier 2 Forms present were bowl transition, mound transition, bowl, plane, trough, mound, and wall. The Tier 2 Forms present in 2017 were the same. They did not differ much from fish site 4 other than being more complex.
3.4
This reach was a little bit more mixed, but over time (2011 to 2017) there was a lot more mound trasition.
3.5
In 2011, the Tier 3 Units present are banks, glide-run, margin attached bars, mid-channel bars, pocket pools, pools, and transitions. The 2017 survey had banks, barface, glide-runs, margin-attached bars, mid-channel bars, pocket pools, pools, rapids, riffles, and transitions.
3.6
I think GUT does a good job at discriminating most areas other than the possible cascade below.
3.7A1
The geomorphic unit forced by planform.
3.7A2
The geomorphic unit orientation is streamwise, meaning it is parallel to the flow.
3.7A3
The geomorphic unit position is mid-channel, located in the middle of the stream.
3.7A4
The geomorphic unit low flow water surface slope is shallow based on the Water Surface DEM.
3.7A5
The geomorphic unit low flow relative roughness is low and not obstructed by the substrate.
3.7A6
Based on the five attributes the Tier 3 specific morphology is a structurally-forced pool.
3.7A7
Geomorphic unit forcing is the key attribute for discriminating what it is.
3.7A8
GUT does not capture the whole shape of the pool.
3.7B1
The geomorphic unit is forced by planform
3.7B2
The geomorphic unit orientation is streamwise.
3.7B3
The geomorphic unit position is bank-attached.
3.7B4
The geomorphic unit low flow water surface slope along the whole bar is relatively shallow.
3.7B5
The geomorphic unit low flow relative roughness is moderate
3.7B6
Based on the five attributes the Tier 3 specific morphology is a point bar.
3.7B7
Geomorphic forcing, position, and orientation are the key attributes for discriminating what Tier 3 unit it is.
3.7B8
GUT didn't capture the entire bare and broke it up into multiple segments.
3.7C1
The geomorphic unit forcing is not forced.
3.7C2
The geomorphic unit orientation is streamwise.
3.7C3
The geomorphic unit position is side-channel, located on right side of the stream.
3.7C4
The geomorphic unit low flow water surface slope is shallow.
3.7C5
The geomorphic unit low flow relative roughness is low and not obstructed by the substrate.
3.7C6
Based on the five attributes the Tier 3 specific morphology is a glide.
3.7C7
Geomorphic unit relative roughness and low flow water surface slope are the key attributes for discriminating what Tier 3 unit it is.
3.7C8
I don’t notice any differences with GUT.
2.8A
Within the circle it looks almost like a cascade, but the low flow relative roughness and surface slope is too low. I am going more towards plunge pool because of its concavity and relative roughness and surface slope.
2.8B
I think GUT did a pretty good job at identifying the unit, but I didn't notice the large rocks until I looked at the hillshade.
2.8C
GUT identified the geomorphic unit as a pool. It didn't really specify what kind of pool so I am going to say it is a plunge pool.
Differences Between F4 and F6
3.1
The geomorphic units in fish site 4 were not as mixed as they were in fish site 6. Fish site 6 was more complex and I would make a bet that fish site 6 has more fish because of the complexity.
3.2
There is a lot more happening in fish site 6. It isn't just a boring straight stream. It has more curvature and a lot more mid-channel bars than fish site 4.
3.3
I think you could get a general idea, but I don't think it represents the geomorphic units very well. Especially if I just had one picture. More data is always better.
Synthesis
4.1
The Tier 2 forms shown in GUT were bowl, bowl transition, trough, plane, mound transition, saddle, mound, and wall. I do not think we have discussed "transitions" on our field trip. We have talked about hinges and riffle crest, but not transitions from one unit to the other.
4.2
The Tier 3 Units GUT provided were bank, pool, pond, pocket poo, chute, rapid, cascade, glide-run, riffle, step, mid-channel bar, margin attached bar, bar face, and transition. I am pretty sure GUT bases the units off a set of data. When in the field we may classify things differently based on the reach we are looking at.
4.3
To apply Tier 4 you need the vegetation and substrate size. I was able to see the layer for vegetation, but I was not able to figure out how to see the substrate.
4.4
I would prefer identifying geomorphic units in the field because I would feel more confident when classifying units when I can visually see them. It is hard to keep track of all the data and not visually see what is happening. It is definitely helpful and better than nothing when looking at a watershed.
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