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The Ground Water Flow Model shuvalovo

Aquifers are well developed over the area of St. Petersburg. They are both a valuable nature resource and a problem for the urban development.

In the city's area there are 4 major aquifers. The level of the free ground water varies from 0.5 to 3 m within the city area. This aquifer undergoes an intensive man-caused impact, is mostly exposed to pollution and may facilitate the transport of pollutants to other aquifers.

The glacial deposits host 2 aquifers, which are referred to as upper and lower intermoraine aquifers. These aquifers are important sources of ground water for the emergency water supply system of St. Petersburg. At the same time, the aquifers can be exposed to negative impact in case of subsurface space exploitation, being located rather close to the daylight surface Pollutants can migrate to the aquifers, resulting from their interaction with the first closest to the surface aquifer. The upper intermoraine aquifer in some areas of the city even comes up to the surface, thus leading to flooding of built-up grounds.

The aquifer hosted by Vendian deposits is an important source of potable water for Kurortny district of St. Petersburg. Being deep-seated, it is quite well protected from the man-caused impact.

Thus, protection and sustainable use of ground water is one of most important tasks of the urban environment management.

The Province of Milan has a very intense and positive experience in using ground water flow modeling to tackle the task of protection and sustainable use of the ground water in the Province. The software called SOIL-GIS, which is an extension for ArcView 3.2, is intensively used by experts of relevant departments of the Province to support managerial decision-making.

In the framework of GeoInforM activities the SOIL-GIS software was further developed and adapted for a much more complicated area of St. Petersburg. The testing of the model was done for two pilot areas. For Shuvalovo quarry the experts tackled the problem of oil pollution expansion in ground water and risk of polluting the upper intermoraine aquifer with oil products. For the area of Polustrovo mineral water occurrence, where the flooding of built-up areas with ground water can be observed, the variation of ground water head was simulated.

The results of testing showed that the modeling is a very promising decision-support tool in the field of protection and sustainable use of the ground water in St. Petersburg.


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