The paper summarizes the results of the work done in orders to evaluate the possibility of changing the function and utilization of rubble dosing dam on the Wieprzówka I mountain stream in order to create an artificial lake and ensure that the water level in the reservoir remains the same. The artificial lake will be valuable from the point of view of tourism and what is more it will improve the water retention of the valley. A rubble dosing dam protects the river bed by reducing the bed slope and water velocity and what is more by controlling the bedload transport so that accumulation takes place up the dam. The dam does not stop bedload transport because there are openings which dose the fine material. The fine material can be transported even if the rubble dosing dam is filled up, so the hydrodynamic equilibrium and the connection between upstream and downstream sections of the river is maintained. Hydraulic seal of the rubble dosing dam and the exploitation of accumulated bed material will break the hydrodynamic continuity of the river channel and cause erosion below the dam – a process against which the dam should protect. Field measurements carried out on ...
The many years' measurements of silting the small water reservoir, closing the cachment covered loesses soils, allowed on the change qualification of the silt-ing degree during operation. In this work was compared the archival data from the measurements of silting the water reservoir in Zesławice, executed in the pe-riod before his desilting, with the results of measurements executed after desilting and building the side assistant reservoir. Water reservoirs in Zesławice are characterize the high intensity of silting. The Annual mean of silting ratio of res-ervoirs carries out: 3,0 % – the main reservoir before desilting, 1,87 % – the main reservoir after desilting and 1,00 % – the side assistant reservoir. Disposing the volume of sediment stopped in reservoirs the coefficient of the mechanical denudation was counted, definite by Wiśniewski as the relation of the volume of sediment deposited in the reservoir to the catchment area. The defi-nite approximate value of the denudation, for the help of this coefficient, proved considerably diverse in the individual years in which the measurements of silting were made. The mechanical denudation coefficient was counted for periods before and after desilting of the main reservoir. The results of the calculations of the transportation of ...
1-dimensional models, e.g. HEC-RAS, MIKE 11 are used to calculate water surface elevation concerning probable discharges for flood hazard areas designa-tion. Hydro-informatic software programs HEC-RAS and MIKE 11 are used for modeling of water discharge in the river bed and in the river valley, with engineer-ing objects of complicated structure (bridges, culverts, weirs etc.). The following stages of modeling may be distinguished: schematisation of water network, geodetic measurements of the river bed and engineering buildings, identification of roughness coefficients, hydrological calculations of discharges in selected profiles of the modelled watercourse considering the boundary conditions, numeric calcu-lations with calibration and verification of the model as well as visualisation of the calculations' results. The paper presents the results of modeling of a sector of The Lubcza River in the Wislok basin having length equal 8,7 km (uncontrolled basin), in which 17 bridges and 12 weirs are located. The elevations of the water surface for di-scharges of the defined probability of exceedances and the Digital Model of the Water Surface (DMWS) are the basis for the analyses and comparison of the obta-ined results. Flood hazard areas occur on the intersection of the Digital Terrain Model (DTM) and DMWS. The knowledge of water ...
