committee for nature use, environmental protection and ecological safety, city of st. petersburg...

КОМИТЕТ ПО ПРИРОДОПОЛЬЗОВАНИЮ ОХРАНЕ ОКРУЖАЮЩЕЙ СРЕДЫ И ОБЕСПЕЧЕНИЮ ЭКОЛОГИЧЕСКОЙ БЕЗОПАСНОСТИ

САНКТ-ПЕТЕРБУРГА

COMMITTEE FOR NATURE USE, ENVIRONMENTAL PROTECTION AND ECOLOGICAL SAFETY, CITY

OF ST. PETERSBURGКомитет по природопользованию, охране окружающей среды и обеспечению

экологической безопасности Правительства Санкт-Петербурга Committee for Nature Use, Environmental Protection an Ecological Safety, Government

of St. Petersburg

Dmitry Frank-KamenetskyДмитрий Франк-Каменецкий

Digital map of geological zoning of St.Peterburg




OF ST. PETERSBURG

Zoning of St.Petersburg territory

Mechanical and filtration properties of the rocks were analyzed. The major geological units which define geological structure of the territory were distinguished.

Special database of the drill holes penetrating the marking geological units was designed.

A set of digital maps of suitability of the SPb territory for above-ground construction was designed.




OF ST. PETERSBURG

Schematization of the geological section of the territory was based on the following principles:

• Stratigraphic position of the units

• Engineering properties of the unites which defines their suitability for above-ground construction.

• Hydro geological properties of the unites and significance of the hosted aquifers for exploitation.




OF ST. PETERSBURG

The major geological units which define suitability of the territory for constructing.

Holocene unit – the upper part of the section. The unit consists of loose rocks with high organic component. The unit hosts ground water defining hidrogeological properties of the hole section. Above moraine Ostashkov unit overlays Holocene unite. The bottom of the unit is the roof of Ostashkov glacial deposits. The bed contains bandy clays and dusty sands. The units hosts non-head ground water. It also contains lenses of ground water with local head. Ostashkov moraine unit is comprised by glacial deposits of the last glaciations. Specific feature of the unit is presence of course-grained terrigenic material and boulders. The bed protects head ground water against surface pollution. Penetrating of the unit can course head water breaking. The unit sometimes host ground water lenses with local head.




OF ST. PETERSBURG

Moskow-Ostashkov inter moraine unit – is comprised by sediments formed in inter glaciations period. The bed has laterally and vertically variable composition. The unit contains upper inter moraine aquifer.

Locally the unite contains organic which may course nature gas generation.

Moskow morain unit is comprised by sediments of Moskow glaciations. It has the same composition and properties as Ostashkov moraine unit.




OF ST. PETERSBURG

Vologda-Moskow inter moraine unit has the same composition and properties as Moskow-Ostashkov inter moraine unit being formed in inter glaciations period. It is locally developed. It can be observed mainly in the pre Quaternary surface depressions. The unit contains lower inter moraine aquifer.

Vologda moraine unit is formed by Vologda glaciations sediments. It has the same characteristics as the above described moraine units. It is locally developed being observed onl;y in the deepest pre Quaternasy valleys.

Vologda under moraine unit can be locally traced in the thalwegs of pre Quaternary valleys. The unit contains head water. The bottom of the unite is the pre Quaternary deposits surface.




OF ST. PETERSBURG

Marking surfaces within the Quaternary deposits section.

1.Bottom of the Holocene sediments.

2.Roof and bottom of the Ostashkov moraine unit.

3.Roof and bottom of the Moscow moraine unite.

4.Roof and bottom of the Vologda moraine.




OF ST. PETERSBURG

Special database of the drill holes penetrating the marking geological

units




OF ST. PETERSBURG

Drill holes penetrating the pre Quaternary deposits.




OF ST. PETERSBURG

Drill holes where Vologda moraine sediments were observed.




OF ST. PETERSBURG

Digital map of suitability of the SPb territory for above-ground construction




OF ST. PETERSBURG

Zones of suitability for constructing

Reliable basement on the depth of 0-2 m.



Reliable basement on the depth of >15 m.

Hydrology

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