Environmental Engineering Reference
In-Depth Information
Fig. 5.13 The Nida
'
s old river channel during winter
named also the Old Eastern Nida or the Old Nida II. Numerous oxbow lakes and
wetlands still exist in the neighbourhood of these channels. Close to the village of
Sobowice another active old channel of the Nida is located. In the region of the
narrowed valley, the wetland (
flowing
in the Branka stream exists. Another hill encroach into the Nida river valley in the
neighbourhood of the settlement Kopernia creates conditions for the P
“
Branka bog
”
) created currently by the water
fl
aszczyzna
wetlands to exist. Downstream, close to the regulated river, the oxbow lakes are
localized. Below of the road bridge and between villages Skowronno and Sobowice
the oxbow lakes are left after river training both on the left and the right terrace.
When planning renaturalisation projects in the
ł
, it should be taken
into consideration that there are still many rare species of fauna and
“
middle delta
”
fl
flora living in
the valley (Stru
ski
2011
). On the other hand, some parts of the river valley are
still cultivated or used as grazing lands. Consequently, renaturalisation projects
should deal with all of the mentioned problems, i.e.: take into account the safety of
the passing
ż
y
ń
flow conditions in
the regulated channel and in the old channels, as well as to improve the ecological
state of the whole system (Bartnik et al.
2013
). The work should start from
redistribution of water
fl
floods, increase the riverbed stability, restore natural
fl
fl
flowing trough the whole system existing in the
“
middle
delta
(Fig.
5.13
).
As Por
ę
bianka used to create braided channel, there were no wetlands in this
valley but only wetted areas connected to the migration zone of the river. In a
mountain region within such areas, high biodiversity can be found. After Korpak
(
2007
) it can be stated unfortunately that between 1975 and 2005 the incised part of
”
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