Vollenweider model
Joao G. Ferreira ★
Simple mass balance model for lakes, based on the Vollenweider equation:
dMw/dt = Min - sMw - Mout
The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs, for eutrophication assessment.
dMw/dt = Min - sMw - Mout
The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs, for eutrophication assessment.
- 8 months 3 weeks ago
Lake ecosystem 1
unicorn
Fertilizer inflow can cause lake eutrophication. In this simulation, we are studying what happens in a simple lake ecosystem.
- 6 years 5 months ago
Simple model of lake dynamics
Graeme Doole
This is an introductory conceptual model that introduces key concepts in the management of lakes subject to nutrient inputs from human activity.
- 5 years 4 months ago
Vollenweider model with diagenesis
Joao G. Ferreira ★
Simple mass balance model for lakes, based on the Vollenweider equation:
dMw/dt = Min - sMw - Mout
The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs for eutrophication assessment.
This version adds diagenesis, using an extra state variable (phosphorus in the sediment) and incorporates desorption processes that release phosphorus trapped in the sediment back to the water column.
The temporal dynamics of the model simulate the typical development of pollution in time.
1. Low loading, low P concentration in lake
2. High loading, increasing P concentration in lake
3. Desorption rate is low, P in sediment increases
4. Measures implemented for source control, loading reduces
5. P in lake gradually decreases, but below a certain point, desorption increases, and lake P concentration does not improve
6. Recovery only occurs when the secondary load in the sediment is strongly reduced.
dMw/dt = Min - sMw - Mout
The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs for eutrophication assessment.
This version adds diagenesis, using an extra state variable (phosphorus in the sediment) and incorporates desorption processes that release phosphorus trapped in the sediment back to the water column.
The temporal dynamics of the model simulate the typical development of pollution in time.
1. Low loading, low P concentration in lake
2. High loading, increasing P concentration in lake
3. Desorption rate is low, P in sediment increases
4. Measures implemented for source control, loading reduces
5. P in lake gradually decreases, but below a certain point, desorption increases, and lake P concentration does not improve
6. Recovery only occurs when the secondary load in the sediment is strongly reduced.
- 2 years 6 months ago
Conceptual model of a lake
Graeme Doole
This diagram provides an accessible description of the key processes that guide the water quality within a lake.
- 5 years 4 months ago
Model of lake dynamics
Graeme Doole
This is an introductory model that presents key concepts in the management of lakes subject to nutrient inputs from human activity.
- 5 years 4 months ago
A model of a Northland lake
Graeme Doole
This diagram describes the key processes that influence the water quality within a Northland lake.
- 5 years 4 months ago
Stock and flow diagram of a dune lake (Working draft)
Graeme Doole
This stock and flow diagram provides a broad description of the key nutrient pathways (N and P) that exist in a dune-lake system subject to external loadings emanating from intensive agriculture.
- 5 years 6 months ago
Vollenweider model with primary production
Joao G. Ferreira ★
Simple mass balance model for lakes, based on the Vollenweider equation:
dMw/dt = Min - sMw - Mout
The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs, for eutrophication assessment.
This version uses nitrogen and adds phytoplankton growth based on a Michaelis-Menten equation
dMw/dt = Min - sMw - Mout
The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs, for eutrophication assessment.
This version uses nitrogen and adds phytoplankton growth based on a Michaelis-Menten equation
- 1 year 11 months ago
mass balace of biodigestor eco city technology process
Pagandai V Pannirselvam
Clone pannirbrof Biogas to Energy | Insight Maker https://insightmaker.com/insight/114792/Clone-pannirbrof-Biogas-to-Energy Simple mass balance model for lakes, based on the Vollenweider equation:
dMw/dt = Min - sMw - Mout
The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs, for eutrophication assessment.
Ecocity model , Joanna
http://www.divaportal.se/smash/get/diva2:631144/FULLTEXT01.pdf
dMw/dt = Min - sMw - Mout
The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs, for eutrophication assessment.
Ecocity model , Joanna
http://www.divaportal.se/smash/get/diva2:631144/FULLTEXT01.pdf
- 2 years 6 months ago
Key feedbacks in a shallow lake
Graeme Doole
This diagram provides a stylised description of important feedbacks within a shallow-lake system.
- 5 years 4 months ago
Iso-Valkeinen lake model
Patryk Wójtowicz
Based on Houghton/Higgins Lake
- 2 years 6 months ago
Feedbacks in a shallow lake
Graeme Doole
This diagram provides a stylised description of important feedbacks within a shallow-lake system.
- 5 years 5 months ago
Clone of Conceptual model of a lake
Caleb Jacob Coffey
This diagram provides an accessible description of the key processes that influence the water quality within a lake.
- 5 years 4 months ago
Clone of Clone of Conceptual model of a lake
Graeme Doole
This diagram provides an accessible description of the key processes that influence the water quality within a lake.
- 5 years 4 months ago
Final Model
Hector Ramos
Models ecosystem dynamic of eutrophication.
- 2 years 3 weeks ago
Key feedbacks in a shallow lake relating to Koura
Mereana Wilson
This diagram provides a stylised description of important feedbacks within a shallow-lake system.Mahinga Kai
- 3 years 5 months ago
Clone of Clone of Vollenweider model
Pagandai V Pannirselvam
Simple mass balance model for lakes, based on the Vollenweider equation:
dMw/dt = Min - sMw - Mout
The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs, for eutrophication assessment.
dMw/dt = Min - sMw - Mout
The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs, for eutrophication assessment.
- 2 years 7 months ago
Clone of Vollenweider model
Monique Beyer
Simple mass balance model for lakes, based on the Vollenweider equation:
dMw/dt = Min - sMw - Mout
The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs, for eutrophication assessment.
dMw/dt = Min - sMw - Mout
The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs, for eutrophication assessment.
- 4 years 1 month ago
Clone of Vollenweider model
James Dare
Simple mass balance model for lakes, based on the Vollenweider equation:
dMw/dt = Min - sMw - Mout
The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs, for eutrophication assessment.
dMw/dt = Min - sMw - Mout
The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs, for eutrophication assessment.
- 4 years 2 months ago
Clone of Lake ecosystem 1
Lucas Diego Mota Meneses
Fertilizer inflow can cause lake eutrophication. In this simulation, we are studying what happens in a simple lake ecosystem.
- 6 years 5 months ago
Clone of Lake ecosystem 1
Graeme Doole
Fertilizer inflow can cause lake eutrophication. In this simulation, we are studying what happens in a simple lake ecosystem.
- 5 years 5 months ago
Clone of Lake ecosystem 1
unicorn
Fertilizer inflow can cause lake eutrophication. In this simulation, we are studying what happens in a simple lake ecosystem.
- 6 years 5 months ago
Phosphorus in a Lake
Emily
A simple phosphorus model for a generic lake.
- 1 year 6 months ago