https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2 Here you can ask general questions or add comments about the exam, the formula sheet, the individual topics covered in class and the exercises. en-us 2022-12-21 14:16:41 UTC 2026-02-05 19:42:09 UTC hello@padlet.com https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2436706984 Exercise 1: Discharge calculation

For the new wettet perimeter P_v, better to assume h or to calculate the orthogonal distance from the embankment to the water surface?

Thanks!


]]> 2023-01-08 11:07:05 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2436706984 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2439074732 2023-01-10 10:18:58 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2439074732 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2439711107 Regarding wide channels, should we use h and b' instead of R_s and b for every formula or just for WaP?

Thanks!]]> 2023-01-10 17:34:53 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2439711107 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2439721828 If a discharge is given, and the calculated non-dimensional shear stress is larger than the critical non-dimensional shear stress as well as the critical non-dimensional shear stress of the armor layer; is that true that in this case the minimum and the maximum beadload transport capacity is the same?]]> 2023-01-10 17:41:11 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2439721828 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445412853 (lecture 2, slide 22)
- What does it mean when data is homogenized? Is the data from the FOEN homogenized or not? (In german it says no, and in english yes, I am confused.)
- Why do they use the Maximum Likelihood method?]]> 2023-01-16 09:29:13 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445412853 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445423568 (lecture 2, Slide 36)
How far beneath the average bed level do we normally choose the reference height? Is it the deepest point where we would expect erosion?]]> 2023-01-16 09:38:43 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445423568 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445432751 (lecture 2, slide 42-43)
Did I understood it correctly that the annual total bedload over the distance is the sediment transport diagram? Or is tit the changes in transportet volume over the distance?]]> 2023-01-16 09:47:17 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445432751 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445509270 Why is R = r/2? Which of the two r's is the normal radius? (pipe flow)]]> 2023-01-16 10:59:32 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445509270 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445511736 (lecture 3, slide 26 or on formula sheet)
When I have a range as (1.5-2) d or (2.5-3)d90, how do I know which value to take for my calculations?]]> 2023-01-16 11:02:09 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445511736 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445618214 How do I know whether to take a smaller or bigger value in the next iteration (method of partial areas)? ]]> 2023-01-16 12:48:56 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445618214 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445629514 (lecture 5, slide 11)
For what is this coefficient of determination R² useful? What does a large/small value mean?]]> 2023-01-16 12:59:51 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445629514 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445669972 (lecture 5, slide 65)
How can I calculate this delta dm (last row)? ]]> 2023-01-16 13:38:56 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445669972 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445706257 - Why doesn't they account for F_Bsin(alpha)?
- Where do the drag and lift force act, when not at the center of gravity?]]> 2023-01-16 14:08:23 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445706257 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445879270 (lecture 7, slide 21)
What does this n= 1/2 and n= 2/3 stand for?]]> 2023-01-16 17:01:46 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2445879270 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2446044006 (lecture 10, S.44)
Why do the bank slopes become smaller during flood events?
(lecture 10, S.45)
Why can i express the wavelength in terms of Q? For me this does not make sense with the units.]]> 2023-01-16 20:48:12 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2446044006 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2446058687 (slide 12)
What does C describe and how do I know which C to take?]]> 2023-01-16 21:14:14 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2446058687 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2446064196 (lecture 13, slide 11)
What does parameter a stand for?]]> 2023-01-16 21:24:44 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2446064196 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2446068893 I do not understand in which case or for which purpose they are: 
a) pointing upstream 
b) pointing downstream
c) bent/curved ]]> 2023-01-16 21:32:54 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2446068893 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2446471279 Will there follow more handouts (as for the first lecture)? ]]> 2023-01-17 07:53:32 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2446471279 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2451810102 Can you please provide master solutions to the excerises? We have very little material to study with for this exam and in order to really understand what assumptions we have to make at different steps of the calculations, solutions would help a great deal.]]> 2023-01-21 11:15:45 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2451810102 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2453274147 1. How do I get the characteristic bed forming discharge?
2. How do I know which/how deep bank protection I need?
3. How do I know how the restoration affects the grain size diameter d_m?

Thank you very much in advantage for your help!]]> 2023-01-23 14:10:54 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2453274147 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2454278675 What does this y0 stand for?]]> 2023-01-24 07:34:02 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2454278675 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2457578724 Are the parameter symbols at the exam corresponding to those on the formula sheet?]]> 2023-01-26 13:21:50 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2457578724 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2457579152 How should we read the axes and interpret the distribution of stress and resistance, i.e what units do the axes have? What do the areas under the curves mean? What is the meaning of the overlaying area? Why is the frequency of the resistance higher than that of the stress?]]> 2023-01-26 13:22:10 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2457579152 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2457580295 S and B as indexes stand for example for river bed, which other variables are there which mean the same thing? ]]> 2023-01-26 13:23:04 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2457580295 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2457581937 Is there a way to estimate this angle, if it is not known from a laboratory experiment? 
Did I understood it correctly that you can't show this angle on the image of this slide?
(lecture 13, S.19)]]> 2023-01-26 13:24:26 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2457581937 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2457582926 What do we want to find out with this formula? Why do we put the critical shear stress of the bed in relation to the one on the embankment? (S.33)]]> 2023-01-26 13:25:17 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2457582926 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2457589854 How should we read this diagram? What do the lines mean / how should the lines (D* and bedforms) be interpreted?
Should we know D* also by heart?]]> 2023-01-26 13:30:04 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2457589854 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2457598303 page 47: there are 2 cases differentiated, what are these? Is it important that we know the derivation of this graph? I did not quite understand what was done on page 47ff... ]]> 2023-01-26 13:36:22 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2457598303 https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2457605448 Does this equation describe the quadratic velocity profile? I could not find it in the lecture notes]]> 2023-01-26 13:41:36 UTC https://padlet.com/vawassistenz/kd9gvcvzf4zvfwu2/wish/2457605448