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Please make at least two contributions to this place by TUESDAY evening. Here are some examples:
(1) post your thoughts on the paper (the writing was clear, concise or the figures sucks)
(2) sharing a critique (did the paper complete it goal?)
(3) ask a question (I don’t understand this method) (Figure XYZ confuses me because...)
(4) topics you'd like the group to discuss
(5) make a connection to a previous paper
(6) Define an important concept from the paper
(7) respond to someone else's post

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in fig2, why there is a huge jump around 2km for the predicted channel width?

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in fig2, why there is a huge jump around 2km for the predicted channel width?

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what are the governing equation in the CHILD model? 

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what are the governing equation in the CHILD model? 

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What did people find to be the most important implication from the model?

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Zooming around on Google Earth, etc, it appears that some of these formerly-endorheic basins in the Central Apennines are connected by meandering rivers. Until reading this paper, this feature didn't make much sense to me -- why would a knick zone meander? But possibly these features are coming from the different erosivity of the bedrock (compared to basin fill) and the constraints on channel width, leading to a shallower equilibrium stream gradient, leading to the necessity of a longer channel in the bedrock zone...

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We will take time to connect this paper to previous articles. If you lead a discussion already, be ready to tell us how (or how not) this paper relates with the one you presented.

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Is there a video of the model running anywhere? 

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Is there a video of the model running anywhere? 

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In fig. 4b, are the two distinct bends in the plot associated with large slip events on the fault?

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How far up the catchment can narrow/steepened stream geometry propagate before it just gets filled in from landsliding?

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Previous work stresses the dynamic nature of the shape of bedrock channels and shows that channel dimensions depend on a number of variables

They want to understand the influence of dynamic channel adjustment on landscape evolution.

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For simplicity, no critical shear stress for particle entrainment (and thus erosion) is specified in this study. However, we  performed several tests using a critical shear stress representative of the measured average median grain size along the Rio Torto, the results of which are presented in section 5.4.

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How channel width scales (Equations 1, 2, and 3)

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How channel width scales (Equations 1, 2, and 3)

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(1) width scales with discharge
(2) width scales with discharge and slope (Finnegan)
(3) width scales with discharge and slope with a reduction of width-to depth ratio as slope increases (tectonic disturbance) (Whittaker)

All of these make different predictions of the spatial and temporal evolution of channel geometry in response to changing boundary conditions. These can lead to substantive difference in the wider landscape.

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Consider how models are applied in general and how is modeling applied in this paper. Models can be used for:

Developing a hypothesis

Exploring behavior based on simple physical laws/rules

Additional (theoretical) line of evidence for argument or in support of a given hypothesis

Prediction

What else can models be used for? How do they used their model? Which in terms of knowledge/understanding is the most valuable? How important is calibration/validation?

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rate of potential energy expenditure of a body of water moving downstream (specific is per unit area)

pgQS/W

Width (channel geometry) influences fluvial dynamic, adjacent hillslopes, and landscape evolution

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Why the Rio Torto?

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static expression for channel width

(eq 1)

more ‘‘realistic’’ dynamic adjustment of channel width to a change in slope (eq 2&3).
Dynamic Case I (Finnegan) and II (Whittaker).

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Figure from Tucker et al., 1997 showing variables/process modules in CHILD

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How does Channel- Hillslope Integrated Landscape Development (CHILD) model (Tucker at al. , 2001) work?

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Precipitation is generated phenomenologically by Poisson

arrivals of independent and identically distributed rectangular

pulses such as are shown in Figure 5

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CHILD model has some limitations
1: Treating climate as perpetual runoff and not factoring in climate change
2. Simplified basin hydrology

Are these negligible here or something to take a closer look at?
How would the model potentially look if we could somehow add in these variables?

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Current mediterranean climate.

Model reaches topo steady state (SS) (erosion = uplift) then they increase fault acceleration.

Evidence that rivers and footwall drainage networks established prior to acceleration.

So they applied to the modern topo the uplift field associated with a fault acceleration 0.3mm/a until it reached SS. Then the response to throw increase (1mm/a) was analyzed.

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The sequel to the Whittaker et al., 2007 paper? 

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The sequel to the Whittaker et al., 2007 paper? 

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justified by small spacing between faults

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hydraulic scaling coefficients and erodibility coefficient

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hydraulic scaling coefficients and erodibility coefficient

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kw, kwf, kww
kb

Need to calibrate these to match field conditions. They found kw needed to be 4.6 to match width values from the upper part of the real catchment.