The aim of river and valley restoration is re-establishment of natural or close to natural state in which the river channel and valley were before regulation works. River and valley were losing their natural state due to various factors. Mostly, it was connected with the radical changes as the result of the regulation works, i.e. river bed straightening , river gradient increase, standardization of size and shape of river cross section , liquidation of banks and channel bed irregularities, ecotones destruction, cutting off links between old river-bed and main river channel, reduktion in overbank flooding and floodplain storage. Increasing of water pollution in the past it was also chemical factor which changed natural state of rivers. Restoration is usually long-lived process which consists of different technical measures and induced by them ecological changes of water body and surroundings areas accomplished by nature. The full re-establishment of natural state is not possible in practice. By the time the restoration works begin the hydrological, hydraulic and environmental conditions should be recognized. The restoration works may be placed in the river bed, bank zone, along river valley and in tributaries or in the catchment area. The process of restoration encounters many and varied ...
The analysis of flow and river bed conditions of the Vistula River on section km 599-600 km are presented in the paper. That section of the river has not been regulated yet. River bed is irregular with numerous islands and rich vegetation. Due to nature value of the river section the nature reserve “Kępa Antonińska” was established there. The river causes a risk of erosion of flood protection embankments. However, technical solutions for improving of river bed stability can not be applied there due to requirements of environmental protection. The analysis of solutions suggested by naturalists indicated that are not considering in satisfactorily degree the specific of fluvial processes. Application of those solutions will lead to deterioration of morphological condition in river bed on the nature reserve area. ...
This paper presented the characteristics of six chosen river restoration pro-jects, which three of them have been developed in Poland and single in Denmark, England and Germany. Five of that projects have been realized, in it one partly, however in one case conception project was presented. In selection of cases guided of their differentiation in regarding to project's aims, scale of investment and technical measures used. This was a base for analysis river restoration projects regarding to aims and scope of works. The main aim of river restoration is improvement of environmental, natural and landscape conditions, but in each pro-ject this aim is achieved by using different measures. The principle is that project includs of a number supplementary aims, therein connected with river's and val-ley's economic utilization, to which can by inter alia accepted improvement of flood protection, navigation condition technical infrastructure operating and development of tourism and recreation.
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