Environmental Geology
- Gothenburg Northern Archipelago
System Analysis 1
- Pollution in the area of Gothenburg Northern Archipelago
In the first system analysis the whole Gothenburg northern archipelago was modelled with the question “what affects transport and accumulation of pollution in the Gothenburg northern archipelago?”. The parameters which was considered to have an impact on the question can be seen in table 1.
Table 1. The 8 parameters and their definitions, used in the system analysis of the Gothenburg northern archipelago.
Table 2. Cross-impact matrix of the system Gothenburg Northern Archipelago.
Figure 1. Cause and effect diagram of the Gothenburg Northern Archipelago.
Results of analysis
Figure 2. System Relationship graph of the Gothenburg Northern Archipelago. The System relationship graph illustrates the parameters that had critical interaction
The resulting cause and effect diagram (Figure 1) shows that discharge from both Göta Älv and Nordre Älv are the most dominant parameters of the system. The Surface Runoff from land has also strong influence on the other parameters and is less affected.
Turbulence is also an important parameter that is quite active affecting other parameters. Grain Size, Organic Content and Flocculation are fairly active parameters but are mostly affected by the others. Groundwater Flow is the least active parameter.
The influence diagram (Fig 2) shows the relationship strength between the parameters. Only the Critical, Strong and Medium interaction levels are shown to easily visualize the results.
Discharge of Göta Älv and Nordre Älv influence four other parameters and therefore are important parameters in the system behaviour. Grain size, Flocculation, Organic content are the most affected parameter influenced by five or four other parameters and therefore have importance to the system dynamics. Turbulence is also very active. Surface runoff is the only parameter that is not affected by others.
The results from the system analysis modelling are shown in the separate figures and tables below. The Cross-impact matrix shown in table 2 shows that the strongest influencing parameter in the system is the Discharge from Nordre Älv. The parameter which is effected the moast in the system is the Flocculation of the suspended particles.
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