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| Titel |
Flow from oligotrophic area of Vasyugan mire |
| VerfasserIn |
L. I. Dubrovskaya, L. I. Inisheva |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250035262
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| Zusammenfassung |
| Mires in Western Siberia occupy about 1 ml km2. Vasyugan mire is the biggest in the world.
This unique marsh ecosystem plays an important environmental role not only in Siberia but
also in the whole world. Tendencies of climate changes will, certainly, influence resistance of
marsh ecosystems. This resistance is mainly determined by hydrological regimes of
ecosystems.
Changes appear, on our opinion, in the structure of hydrologic and heat balances of marsh
ecosystem which are quantitative concepts of correspondent regime. In this connection the
task of hydrologic mire regime appears.
Thus, formation of mire river network of secondary origin connects with evolution of
mires themselves, their association into large massifs and appearance of complicated marsh
systems with erosion, as a result of peat accumulation, peculiar topography.
Let’s consider these statements on the example of landscape profile of drainage river
basin in the limits of oligotrophic are of Vasyugan mire, especially, during spring high waters,
when rain waters flow along the bog surface favoring formation of new secondary water
courses.
The aim of this work was to identify connections filtration properties of separate
microsites with bog waters levels and calculation of flow of 5% probability.
On the basis of site and typological map of 1:25000 scale six types of microsites were
detached. In this case type is considered as filtration characteristics classification. All the
calculations were made individually for every microsite.
Curves of links of individual discharges with bog water levels were calculated for
following types of mire microsites: pine-shrub-Sphagnum biogeocoenasis with low pine (low
rjam), pine-shrub-Sphagnum biogeocoenasis with high pine (high rjam). For others
there were used bookish data getting for mires of North-West European area of
Russia.
According to the calculated levels of 5% probability flowages are determined, and
maximum outflow from the area, which is limited by contour of run-off L, is calculated.
Digital analog of site and typological map was used for identifying of areas and linear
sizes of marked types of microsites. This analog was made with the help of GIS
Arc View 3.2. Total discharge flowing through the whole contour is determined by
formula:
j-=s j-=s i-=n
Q = Qj = qzj (ÎL )isinαi
j=1 j=1 i=1
where αi is the angle between the element of the contour ÎLi and the line of run-off at the
given point of the contour Li; qzi is the individual discharge (cm2/s) identifying according to
the curve of connection with bog water levels for j - microsites; j –is the ordinal number of a
microsite (Ivanov K.E. Hydrology of Mires, 1953).
As a result of calculations the modulus of maximum spring flow of 5% probability from
high oligotrophic bog is 83,2 k/s c km2, this is significantly lesser analogous flow from mires
of european area of Russia.
Keywords: high bog, flow, filtration, mollisoil, microsite, phytocoenose, individual
discharge, contour of run-off, bog water level
Acknowledgements: This research was supported by RFFR (No.No. 09-05-00235,
09-05-00395), Minister of education and science (No. 02.740.11.0325). |
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