Identify useful variables and assemble metadata

Subtask Description:
Describing the model at process and functional levels.

Action points of the implementation:

Result: A description of the model in diagrams and tables.

Area:
Himmerfjärden , Sweden

Policy Issue:
Eutrophication status and reduction.

Human Activities:
Urban sewage discharge, agriculture and industrial activity, tourism.

General Information:
Nutrient loading has caused increased turbidity, loss of biodiversity (including submerged aquatic vegetation), deep water oxygen deficiency, phytoplankton blooms and biodiversity loss. The main stakeholder concerns are connected with tourism, recreational activities and nature enjoyment, and the sustainable implementation of the WFD that poses economic challenges for several activities in the area.

Example of Implementation:

Process Name

  1. Scenario for reducing nitrogen loadings

Function in model

Choose one or several policy options for reducing nitrogen loadings

 

 

Variables IN

Policy option/s chosen from the data bases, HSTP, AGR, and/or PS. 

 

 

Information IN

Measures for reducing nitrogen loadings

 

 

Variables OUT

Nitrogen loadings and nitrogen reduction (kg)

 

 

Formulation

The nitrogen reduction is dependent on the scenario chosen.

 

 

Reference

Policy options as agreed upon with the SSA Reference Group of stakeholders

 

 

 

 

Process Name

  1. TEMPORARY MARINE MODEL: Secchi depth

Function in model

ESE link, ecology links to socio-economic systems

 

 

Variables IN

Yearly nitrogen discharges (kg) and nitrogen reductions (kg), DB_N loadings HSTP/AGR/PS and DB_N reduction HSTP/AGR/PS

 

 

Information IN

Variables IN dependent on scenario

 

 

Variables OUT

Secchi depth improvement (in metres)

 

 

Formulation

Secchi depth (metres, summer) =
(-0.0035*(nitrogen discharges tonnes/year)+4.2)-2.74

 

 

Reference

The estimation used is slightly adjusted but initially estimated by Jakob Walve.

 

 

Process Name

  1. TEMPORARY MARINE MODEL: Secchi depth

Function in model

ESE link, ecology links to socio-economic systems

 

 

Variables IN

Yearly nitrogen discharges (kg) and nitrogen reductions (kg), DB_N loadings HSTP/AGR/PS and DB_N reduction HSTP/AGR/PS

 

 

Information IN

Variables IN dependent on scenario

 

 

Variables OUT

Secchi depth improvement (in metres)

 

 

Formulation

Secchi depth (metres, summer) =
(-0.0035*(nitrogen discharges tonnes/year)+4.2)-2.74

 

 

Reference

The estimation used is slightly adjusted but initially estimated by Jakob Walve.

 

 

Process Name

  1. TEMPORARY MARINE MODEL: Secchi depth

Function in model

ESE link, ecology links to socio-economic systems

 

 

Variables IN

Yearly nitrogen discharges (kg) and nitrogen reductions (kg), DB_N loadings HSTP/AGR/PS and DB_N reduction HSTP/AGR/PS

 

 

Information IN

Variables IN dependent on scenario

 

 

Variables OUT

Secchi depth improvement (in metres)

 

 

Formulation

Secchi depth (metres, summer) =
(-0.0035*(nitrogen discharges tonnes/year)+4.2)-2.74

 

 

Reference

The estimation used is slightly adjusted but initially estimated by Jakob Walve.

 

 

Process Name

  1. TEMPORARY MARINE MODEL: Secchi depth

Function in model

ESE link, ecology links to socio-economic systems

 

 

Variables IN

Yearly nitrogen discharges (kg) and nitrogen reductions (kg), DB_N loadings HSTP/AGR/PS and DB_N reduction HSTP/AGR/PS

 

 

Information IN

Variables IN dependent on scenario

 

 

Variables OUT

Secchi depth improvement (in metres)

 

 

Formulation

Secchi depth (metres, summer) =
(-0.0035*(nitrogen discharges tonnes/year)+4.2)-2.74

 

 

Reference

The estimation used is slightly adjusted but initially estimated by Jakob Walve.

 

 

Process Name

  1. TEMPORARY MARINE MODEL: Secchi depth

Function in model

ESE link, ecology links to socio-economic systems

 

 

Variables IN

Yearly nitrogen discharges (kg) and nitrogen reductions (kg), DB_N loadings HSTP/AGR/PS and DB_N reduction HSTP/AGR/PS

 

 

Information IN

Variables IN dependent on scenario

 

 

Variables OUT

Secchi depth improvement (in metres)

 

 

Formulation

Secchi depth (metres, summer) =
(-0.0035*(nitrogen discharges tonnes/year)+4.2)-2.74

 

 

Reference

The estimation used is slightly adjusted but initially estimated by Jakob Walve.

 

 

Comments:
This subtask can help to keep track of the formulation of the model and document it more efficiently, as it provides transparency to each formulated process and gives adequate information to the external reader about the use of the process, the inputs and outputs and, most importantly, the references, when available. The example provided here uses scenarios of nitrogen reduction instead of main processes.

Contact: Frida Franzén frida@enveco.se , Gerda Kinell gerda@enveco.se .