is it so different from rural hydrology? what is the ... 1... · is it so different from rural...
TRANSCRIPT
![Page 1: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/1.jpg)
Integrated Urban Hydrology is it so different from rural hydrology? what is the problem? available modeling approaches
Lars-Göran Gustafsson
Head of Innovation, DHI Sverige AB
![Page 2: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/2.jpg)
Rural versus Urban hydrology – Any similarities?
A natural river stream versus a leaking pipe?
![Page 3: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/3.jpg)
Observed daily discharge in Kungsbackaån
Rural versus Urban hydrology - similarities
Discharge in Kungsbackaån Inflow to treatment plant
Observed daily inflow to treatment plant
Seasonal variation for a year
![Page 4: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/4.jpg)
Rural versus Urban hydrology - differences
Connected impervious areas
Indirect effect from precipitation
Faster response to rain!
Observed high resolution inflow (l/s) to treatment plant
a 24-hour zoom
![Page 5: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/5.jpg)
The problem
• Yearly volume >50% of total wastewater volume
• Daily extremes >90% of total wastewater volume
• Growing problem (+100 % over 50 years in some areas)
• Overloaded wastewater treatment plants (WWTPs)
• Sewer overflow of untreated wastewater to receiving waters
• Overloaded sewer networks with flooding problems
• High energy consumption for pumping stations
Hydrological flow
components in
sewer systems
creates …
![Page 6: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/6.jpg)
Connected surface Over leak Drain flow Infiltration/leakage
fluktuation
volume
Sources to hydrological flow components in sewer systems
Affected by: • Condition of sewer system • Type of system and layout • Topography • Geology • Meteorology
As for rural hydrology
![Page 7: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/7.jpg)
Can a lumped conceptual modeling approach be useful?
MIKE URBAN RDI-module
![Page 8: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/8.jpg)
Combined sewer system in a city center
Impervious areas
Infiltration to sewer system Sanitary flow
Yes! To define flow components
![Page 9: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/9.jpg)
Combined sewer system located in discharge area along a river
Impervious areas
Infiltration to sewer system Sanitary flow
Yes! To define flow components
![Page 10: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/10.jpg)
Old sanitary sewer system in bad condition
Impervious areas
Infiltration to sewer system Sanitary flow
Yes! To define flow components
![Page 11: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/11.jpg)
Measures
implemented
… and for follow up after measures
![Page 12: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/12.jpg)
Measures
implemented
Hydrological model calibration period
… and for follow up after measures
![Page 13: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/13.jpg)
Hydrological model calibration period Simulation after measures implemented
Measures
implemented
Difference
interpreted as
effect of
measures
… and for follow up after measures
![Page 14: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/14.jpg)
Effect of
measures
Observed and simulated cumulative volumes, Oct 2007 – June 2009
Measures
implemented
… and for follow up after measures
![Page 15: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/15.jpg)
Disconnection of impervious areas from sanitary sewers
Relining of sewers and manholes
Construction of new drain schemes
Blue/green storm water management (swales, infiltration)
Predicting effects from alternative alleviation schemes?
![Page 16: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/16.jpg)
drainflow
leakage
infiltration
runoff
rain
evaporation
infiltration
MIKEURBAN
MIKE SHE
MIKEURBAN
MIKE SHE
MIKE SHE
Predictions demand a physical and distributed model approach
MIKESHE + MIKEURBAN
![Page 17: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/17.jpg)
Red areas are strong discharge areas with high need for drainage
… allows identification of discharge areas with high drain needs
![Page 18: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/18.jpg)
Case from Vittskövle, Kristianstad
With urbanization
Sewer system
ARV
Vittskövleån
Natural conditions
Above ground
High
Medium
Low
Groundwater level
… allows description of natural conditions
![Page 19: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/19.jpg)
… allows prediction of effects from measures
Før og efter etablering af dræn
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
16,0
lite
r/s
ek
Dræn-pumpe afbrudt
Områdesdræn
spildevandsledninger
ARV
Tilløb ARV inden tiltag Tilløb ARV efter tiltag Pumpeflow fra drænledninger
Case from Vittskövle, Kristianstad
![Page 20: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/20.jpg)
… allows separation of pluvial floods and groundwater floods
Case from Vänersborg, close to Lake Vänern
Exploitation area Catchment area and topography
Lake Vänern bedrock/sand dunes
clay
High discharge from mountain plateau
Exploitation area
Lake Vänern
Enclosed area
![Page 21: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/21.jpg)
… allows separation of pluvial and groundwater floods
Groundwater flood during wet season Pluvial flood from a 100-year cloudburst
Case from Vänersborg – Natural conditions
![Page 22: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/22.jpg)
… allows separation of pluvial and groundwater floods
Groundwater flooding during wet season Pluvial flood from a 100-year cloudburst
Case from Vänersborg – Future with alleviation scheme
![Page 23: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/23.jpg)
To conclude
Urban hydrology has many similarities with rural hydrology – but more complex!
Lumped/conceptual models are useful to: analyze sources for hydrological flow components distinguish between effects of measures and hydrological variations evaluate climate change effects
Physical/distributed models are needed for: predictions of physical changes analyses of spatial differences deeper analyses of physical behavior
![Page 24: is it so different from rural hydrology? what is the ... 1... · is it so different from rural hydrology? what is the problem? available modeling approaches Lars-Göran Gustafsson](https://reader033.vdocument.in/reader033/viewer/2022041908/5e659fc8db317d776b0ec033/html5/thumbnails/24.jpg)
9 March, 2017 © DHI #24
TACK !