#### Vollenweider model

##### Joao G. Ferreira ★

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.

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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.

- 1 week 4 days ago

Mass balance model for shrimp RAS

Alifa SabilBela BuckJoao G. Ferreira

Alifa SabilBela BuckJoao G. Ferreira

- 3 weeks 2 days ago

This model illustrates why 100% mortality per year does not result in zero animals by the the end of the year.

It implements the trivial differential equation:

dn/dt = mn

Where :

n - number of animalst - timem - annual mortality rate

It implements the trivial differential equation:

dn/dt = mn

Where :

n - number of animalst - timem - annual mortality rate

- 2 months 2 weeks ago

M.Sc. in Environmental Engineering SIMA 2018

New University of Lisbon, Portugal

New University of Lisbon, Portugal

- 1 year 2 months ago

Very simple model demonstrating growth of phytoplankton using Steele's equation for potential production and Michaelis-Menten equation for nutrient limitation.

- 1 year 2 months ago

Very simple mass balance approach to bivalve aquacuture

- 1 year 2 months ago

This model implements the one-dimensional version of the advection-dispersion equation for an estuary. The equation is:

dS/dt = (1/A)d(QS)/dx - (1/A)d(EA)/dx(dS/dx) (Eq. 1)

dS/dt = (1/A)d(QS)/dx - (1/A)d(EA)/dx(dS/dx) (Eq. 1)

- 1 year 3 months ago

Simple model to illustrate an annual cycle for phytoplankton biomass in temperate waters.

Potential primary production uses Steele's equation and a Michaelis-Menten (or Monod) function for nutrient limitation. Respiratory losses are only a function of biomass.

Potential primary production uses Steele's equation and a Michaelis-Menten (or Monod) function for nutrient limitation. Respiratory losses are only a function of biomass.

- 1 year 3 months ago

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.

- 1 year 3 months ago

This model provides a dynamic simulation of the Sverdrup (1953) paper on the vernal blooming of phytoplankton.

- 1 year 3 months ago

Straight copy of the rabbit model and demo of other Insight Maker features

- 1 year 3 months ago

This model shows how a persistent pollutant such as mercury or DDT can be bioamplified along a trophic chain to levels that result in reduction of top predator populations.

- 1 year 5 months ago

WOW - fish Welfare and Oxygen in Water

A simple model for oxygen balance in a salmon farm.

Development notes:

Initial DO in mg L-1 (=g m-3)

Cage volume in m3 therefore DO mass per cage is in g m-3 DO X m3 = g DO

A simple model for oxygen balance in a salmon farm.

Development notes:

Initial DO in mg L-1 (=g m-3)

Cage volume in m3 therefore DO mass per cage is in g m-3 DO X m3 = g DO

- 1 year 9 months ago

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.

- 1 year 9 months ago

Simple mass balance model for lakes based on the Vollenweider equation:

dMw/dt = Min - sMw + pMs - 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 + pMs - Mout

The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs for eutrophication assessment.

- 1 year 10 months ago

M.Sc. in Environmental Engineering SIMA 2018

New University of Lisbon, Portugal

New University of Lisbon, Portugal

- 2 years 2 months ago

This model implements a very simple shellfish carrying capacity simulation for tidal creeks with freshwater input.

Physics

The model implements the one-dimensional version of the advection-dispersion equation for an estuary. The equation is:

Physics

The model implements the one-dimensional version of the advection-dispersion equation for an estuary. The equation is:

Environment Estuary Carrying Capacity Primary Production Hydrodynamics Salinity

- 2 years 2 months ago

- 2 years 2 months ago

Simple model to illustrate Steele's equation for primary production of phytoplankton.

The equation is:

Ppot = Pmax I/Iopt exp(1-I/Iopt)

Where:

Ppot: Potential production (e.g. d-1, or mg C m-2 d-1)

Pmax: Maximum production (same units as Ppot)

The equation is:

Ppot = Pmax I/Iopt exp(1-I/Iopt)

Where:

Ppot: Potential production (e.g. d-1, or mg C m-2 d-1)

Pmax: Maximum production (same units as Ppot)

- 2 years 3 months ago

This model uses simple functions (converters, cosine) to simulate the water balance inside a reservoir.

- 2 years 3 months ago

This model implements the one-dimensional version of the advection-dispersion equation for an estuary.

It develops the basic 1D model by simulating the mass of salt rather than the concentration. This makes it straightforward to deal with multiple boxes of different volume.

It develops the basic 1D model by simulating the mass of salt rather than the concentration. This makes it straightforward to deal with multiple boxes of different volume.

- 2 years 8 months ago

Dissolved oxygen mass balance in a tide pool, forced by tides and light.

- 2 years 9 months ago

The Streeter-Phelps oxygen dynamics model was originally developed in 1925, almost a century ago.

Play

Play

Environment Water Quality Sanitary Engineering Oxygen Oxygen Deficit River Sewage

- 2 years 9 months ago

State variable coupling dealing with multiple units

- 3 years 2 months ago