In the paper is presented the procedure of calculation of the water flow parameters and bedload transport in the small lowland river-bed with a sandy bottom, in which the bank slopes will change roughness by restoration process. In calculation the results of field investigation of flow resistances and bedload transport were used, which were carried out in the natural Zagożdżonka River, located in research catchment of Dept. Hydraulic Engineering and Environment Recultivation Warsaw Agricultural University. The river-bed on investigated reach have following parameters: width of bed at bankfull level – 3 ÷ 4m, bottom width – 2 ÷ 3m, maximal depth – 0.6 ÷ 0.7m, longitudinal slope – about 1‰, bed material – sand with medium size d50 = 0.41mm. Based on results of field investigations the bedload function was established, in which bedload specific rate qr depends on average flow velocity V in river cross-section. The comparison’s calculation of bedload transport show good agreement of results obtained from Bagnold’s and own bedload functions. For prognostic calculations of bedload transport in regulated river-bed both functions were used. In calculation assumption was made that flow conditions in natural Zagożdżonka River can characterize final state of regulated river-bed after restoration process. It ...
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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