- Tytuł:
-
Ocena małej retencji wodnej w Puszczy Zielonka i jej otulinie
Estimation of small water retention in the area of "Zielonka Forest" and its environment - Autorzy:
-
Liberacki, D.
Stachowski, P. - Powiązania:
- https://bibliotekanauki.pl/articles/1825971.pdf
- Data publikacji:
- 2008
- Wydawca:
- Politechnika Koszalińska. Wydawnictwo Uczelniane
- Tematy:
-
mała retencja
parki krajobrazowe
ochrona zasobów wodnych - Opis:
- The objective of this work is estimation of the small water retention in the forest eco-system of the "Zielonka Forest" located in the proximity of Poznań. This paper presents retention management system in the area of the "Zielonka Forest" until 2005 and the projected development up to 2011. It also shows actual effects of investments made on the river channel retention, lake retention as well as marshes and bogs. Also, it details results of analysis over many years of investigations on the change of groundwater level in the forest catchment area of Hutka watercourse located in central part of "Zielonka Forest" which have been conducted by Department of Land Improvement, Environmental Development and Geodesy from University of Life Science in Poznań. The analysis of the actual retention management system in the area of "Zielonka Forest" showed that 15 structures of small water retention accumulated approximately 548 424 m3 of water and proved that smaller water precipitation caused a decrease of retention in areas of marshy and bog ground. In order to increase the surface water retention in the area of "Zielonka Forest", it was decided to apply different hydrotechnical structures until year 2015 and construction of two retention reservoirs with a total capacity of 20 000 m3. As a result of these investments the river channel retention will increase by approximately 47 700 m3 and it is planned to increase the retention in the forest to a total of about 67 700 m3 compared to the current situation. Field investigations conducted over many years in hydrological years with various sums and distribution of precipitation showed large retention capacities of this forest area. Analysis confirmed the usefulness of the dams on the streams which allow accumulation of water resources which naturally influence the increase of groundwater level and limit runoff in the areas of the most intensively drained forests, both wet as well as wet mixed. The natural conditions of "Zielonka Forest" favours such activities where an average unit runoff (about 1 lź s-1źkm-2) is three times smaller than the average in Wielkopolska Region. The main direction of investments in small water retention in the "Zielonka Forest" should be concentrated on the most economic method of retention which is building dams on lakes. Area of "Zielonka Forest" is favourable for plans of increasing retention. Unfortunately, as a result of hydrotechnical activities most of watercourses was practically changed into drainage ditches and included into the natural drainage system by human dug ditches. Although in most cases they are not maintained, but they influence significantly on shaping of groundwater levels In the range of their reach. Because of a very strong connection between hydrological conditions and flora species composition, there is a real danger, that drainage system may start phytosociological processes, which lead to degradation of natural marshy habitats.
- Źródło:
-
Rocznik Ochrona Środowiska; 2008, Tom 10; 657-678
1506-218X - Pojawia się w:
- Rocznik Ochrona Środowiska
- Dostawca treści:
- Biblioteka Nauki
Artykuł