Freshets, by the periodical changes of the hydrodynamic conditions in the river channel, cause its intensive changes. At the time, the occuring fluvial processes have the decisive influence on creation of erosive and cumulative forms in the channel. Dimensions of these forms depend also on sediment transport. This paper presents the results of investigations carried on the Łososina River meander for years 2004–2005. Morphological changes in the channel, created by the 3 freshets, have correlation with the archival data. The bank erosion estimation shows that a cross section of channel has become wider. The changing hydraulic conditions were determined and the sediment transport intensity was estimated. ...
The present paper contains results of researches carried out on the Slomka stream, which is very intensively erosive. A study reach is limited to the channel section being 367 meters in length, with local changes of the bed slope. It woe surveyed in detail and related to data on discharge, channel changes after floods and grain-size distribution of the bed material we have noted that river bank undercuts were dominant forms of bank erosion witch was the most important process for the channel bed modeling. The bed configurations of type chutes and pools were observed because of multiple roughness related to variation in stream power, shear stress, and grain-composition of the bed material. This parameters, longitudinal profiles, volume of eroded material, and intensity of sediment transport have been determined and calculated on the basis of the measuring results. ...
The aim of presented research was evaluation of hydrodynamic conditions changes on the regulated sector of the Smolnik stream. The measurements were carried out in 2008 and 2009. Each series of this study included measurements of the longitudinal profile, cross-sections of channel and the bed material granulation. Results of these works were used to calculate the hydrodynamic quantities as mean velocity, stream power, shear stresses and bedload transport (by the Bagnold equation). It was possible to ascertain that the control works came to expectation and bank erosion was stopped. Locally an intensification of bed erosion had place. An analysis of the longitudinal profiles and course of grain-size composition of the bed material changes proved, that 2 years after control works realization tendency to return to early hydraulic conditions was appeared.
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The main goal of the presented research was to determine the morphological changes in the "regulated" section of the Czarna Nida River caused by four freshets. The surveying measurements of twelve cross-sections, bed material composition and stream velocity were carried out. The changes of the hydrodynamic conditions, having a decisive impact on the intensity of transported material, bank erosion and thus on the channel shape were estimated. The volume of material accumulated within the channel and flood plains and derived from bank erosion was estimated. The Ackers and White- equation was used to calculate the volume of transported material. It was found that the greatest impact on the river channel transformation has the deposition of material.
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Within their catchment basins, brooks and rivers form a structure under which the water flow and morphological processes impact each other. A structure of the flowing water is characterized by such variables as type of substratum, cross-section of the rook channel, longitudinal profile, and horizontal arrangement. Each change in the water flow and intensity of rubble transportation causes the morphology of the brook bed to change, and the direct causes are erosion and deposition processes. The objective of the survey studies presented in this mono-graph was to identify regularities controlling the processes of lateral and deep erosion, transportation, and sedimentation processes in two Carpathian brooks: Słomka and Kasinka. The survey studies were performed in a period from 2004 to 2006.The Słomka brook is a 25.2 km long, left-bank tributary of the Dunajec river and drains an area of 69.90 km2. The Kasinka brook is a right-bank tributary of the Raba river, and it pours into this river at km 92 +750, below the Mszanka brook mouth. The studies comprised both the straight sections of the brook channels and the strongly eroded section along the concave bank (the Kasinka brook). Within the gauging sections, comprehensive measurements were performed in order ...
On Trzebuńka stream, in Stróża village, the project of lowering of 4.0 m and restoring the check dam has been executed. The structure downstream was redesigned to form rapids, made of stones embedded in the "grouted rock" construction. Now, the whole construction of 12 small water reservoirs forms a kind of long fish pass. The preliminary results of stream channel evolution on Trzebuńka stream above the restored check dam are presented in the paper. There are described the local cases of check dam liquidation or restoration in the World. However, there are still many questions concerning the response of stream channel to such technical intervention. The problem of rate of sediment displacement in the reservoir and the consequent erosion base reduction for the channel above is discussed. The field measurements and observation show that two years after check dam lowering and emptying the sediment reservoir on Trzebuńka stream the transformation of new formed channel upstream the new structure is dynamic. At the length of 180.0 m upstream the new dam the bank erosion is significant. Just above 200.0 m upstream from the structure the channel is stable. ...
