|This paper is very interesting and of high scientific quality. The review comments have been addressed and I recommend publication after some editing. I have two remaining scientific comments:|
1) In the Kolka Glacier case, it might not be necessary that water pressures increase to compensate for the added load. If we approximate the overburden pressure by rho g h cos(alpha), where alpha is the surface slope, and the basal stress by rho g h sin(alpha), then an instability would occur for a Delta h if the increased shear stress exceeds the increased shear strength. That would happen for tan(alpha) > tan(phi), where phi is the friction angle.
2) A picture is worth a thousand words: Would it be possible to publish the picture in the response to reviewers? I found it hugely insightful, especially the way it shows the lateral margin of the detachment zone.
The language in the manuscript is much improved, but can still use a bit of editing. Long and convoluted sentences that have to be read multiple times to understand are still common. As a rule of thumb, most sentences three lines and longer would benefit from splitting. Some editorial comments:
p.1,l.24: delete 'later'
p.1,l.25: on -> under; for -> under
p.1,l.25-27: consider splitting into two sentences
p.1,l.28-30: awkward sentence
p.2,l.2-4: consider splitting this sentence
p.3,l.6: fix parentheses for citation
p.4,l.14: delete 'that reads'
p.4,eqn 4: dh/dt should be a partial derivative, same on next page
p.5,l.3: delete 'using'
p.5,l.5: delete 'in this case'
p.5,l.12: that -> the
p.5,l.27: by -> with
p.6,l.20: delete 'initially' (start already implies initially)
p.6,l.30-31: I don't understand this, how is debris thickness inferred?
p.7,l.11: 'as such show under normal conditions' -> 'thus would normally show'
p.7,l.30: buttresses -> buttress
p.7,l.31: steady-state-conditions -> steady-state conditions,
p.8,l.2: comma after 'stress'
p.9,l.22: on -> of
p.9,l.23: comma after '2016'
p.10,l.13-16: split and reword sentence
p.10,l.21: least-affected -> least affected
p.10,l.25: therefor -> therefore
p.10,l.32: delete 'r'
p.10,l.33: delete 'this' and 'using'
p.10,l.34: delete 'for instance notorious'
p.11,l.20: Though -> While
p.11,l.21: delete 'but'
p.12,l.1: soft-bed -> soft bed
p.12,l.23: lower than THE driving stress
p.14,l.32: only A few ..
p.15,l.12: shear-rate -> shear rate
Fig. 2 caption: delete 'vertical component of' (emergence velocity is the vertical component)
Fig.5 caption: ... with black hatched lines showing temperate areas. The inset highlights ...