The Dobczyce Reservoir is especially important because it is a source of potable water for the inhabitants of Krakow. The source of the reservoir feeding is the Raba river, whose catchment still lacks properly managed sewage disposal, therefore the water inflowing to the reservoir contains pollutants which decide about the insufficient water quality in the reservoir and to a considerable degree also determine the processes occurring in it, including eutrophication and overgrowing. In the work analysed was the loading of the Dobczyce Reservoir with biogenic compound load carried by the waters of the Raba river. The analysis based on tests of the Raba water quality and the flow volume on the inflow to the reservoir in the Osieczany cross section. The tests covered the period from May 2003 until October 2005. Investigations of biogenic compounds concentrations were conducted with average frequency twice a month. Concentrations of NH4, NO2, NO3,PO4 and total P were determined. The loads of individual biogens were computed for days, months and years of the analysed period. The obtained results point to a considerable diversification of mean daily values of loads in the analysed years. They were the highest in 2005 for NO3, NO2 and total P, ...
The river channels exploitation leads directly and indirectly to they river training. The usual consequences of that is a dramatic change of river dynamics. Thus in the studies – especially field studies – which can show the better explanation of river forming channel and river processes are the key elements when one intends to talk about river renaturalization and river rehabilitation. In the following paper the results of investigations of morphological changes within the outlet of sand-gravel river are presented just after the bankfull. Also the granulomerty of the considered river channel material was taken into account. On the base of very detailed field survey done along a mouth unit part of the Raba River situated in front of Polish Carpathians, the authors provided the analysis of morphological and granulometric changes of the river bed and channel. Under the consideration the authors took river bed forms, ricer bed armoring and sub-pavement granulomentry as well as river geometry of the particular cross-sections. Work was done (and is continued) within the years 2005-2006 but only the data from 2005 year are presented here. It was fund that along the research channel many new so called riffle and pool sequences are present as ...
The paper presents measurement and calculation results of volume samples taken from the bedforms of the sand-gravel bed river in Polish Carpathians. As a sample method the “in situ” sample freezing method was applied. River channel geometry and changes in the morphology of the river bed were investigated using laser geodimeter. The procedures have been carried out on the Raba River downstream of its confluence with the Vistula River. The main research was conducted in spring and autumn 2006. To give a picture of the long term processes which have the influence on the changes of the river bed along the investigated reach for comparison some of the results from year 2005 are also presented. The basic information about research catchment, its location, gravel sampling methodology and characteristics of sand-gravel dunes are included. Development of riverbed forms as a mixture of sand and gravel according to their granulometric composition was detailed. The samples were analyzed considering the layered structure of the dunes and the results of statistical calculations are provided. Tables of granulometric parameters in metric and logarithmic scales are presented among other information such as: mean diameter, sorting index, sorting degree, coefficient of grains uniformity and non-uniformity, standard deviation, ...
