Lecture 9 (MIKE URBAN and SCALGO Sønderborg)

Question 1

What is the difference between, 1D, 2D and 3D modelling?

Answer 1

• 1D modelling: The velocity is calculated in one direction – x (The velocity is calculated in the direction of the pipe/stream)
• 2D modelling: The velocity is calculated in two directions – x and y –> in softwares like: MIKE 21: Terrain and MIKE FLOOD.
• 3D modelling: The velocity is calculated in three directions – x, y, z (turbulence)

Question 2

What is the goal/purpose of the case about Sønderborg Harbour?

Answer 2

Protect the inner harbour from a storm surge –> ciritcal sea level is 2,48m.

Question 3

Which scenarios are investigated for Sønderborg harbour?

Answer 3

o Storm surge and a 1 year rain event

o Summer sea level (0,35 m) and:
 a 5 year rain event (service demand)
 a 100 year rain event (cloudburst)

Question 4

What are the solution proposals for the scenario; storm surge and a 1 year rain event?

Answer 4

• Wall that protects the inner harbour
• Storm water pumps

Question 5

What can SCALGO Live be used for?

Answer 5

It is a simple tool for analysing rising sea levels and severe rain events.

Question 6

What are the differences between MIKE FLOOD and SCALGO?

Answer 6

Mike Flood:
o Dynamic – varying over time
o Complex: Description of sewer system, streams, infiltration
o Time consuming
o Need training to learn the program
o Detailed project design

SCALGO:
o Static –no time perspective
o Simple: No description of sewer system
o Simple description of streams
o Land cover map –infiltration can be included
o Fast
o Easy to use –but keep getting new features, that you will have to learn
o Screening tool

Question 7

What is the purpose of the first part of assignment 7 (MIKE URBAN part)?

Answer 7

Status on the Mike Urban model of Sønderborg: SDR_Status
o Calculate the scenarios and compare the results:
 Summer sea level (0,35 m ) and a 1-year rain event
 Storm surge (2,48 m) and a 1-year rain event

Question 8

What is the purpose of the second part of assignment 7 (SCALGO part)?

Answer 8

o Analyse the effect of a wall on the harbour front in Sønderborg
o Analyse “water paths”: Where to place slides in the wall? Allows stormwater to reach the sea under severe rain events, when the sea level is low.