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The paper presents the results of laboratory tests carried out in the modified soil-geotextile permeametr (Fig. 1) recommended in ASTM standard D 5101-90. Laboratory tests were performed on nonwoven geotextile K-500 (Tab. 1) and medium sand (Tab. 2). In ftgures 2 and 3 the change in permeability coefficient in soil-geotextile system and soil under different hydraulic gradients are shown. The relationship...
The article presents methodical aspects of vegetation state assessment with ecological and biotopie evaluation of vegetation preconditioning in suburban zone on the example o f ecophysiographic study for Raszynka catchment area up to Dawidy profile. The area is characterized by agrarian landscape with environmentally disadvantageous land use. Arabie lands dominate in almost entire area, whereas forests...
The aim of the studies was to determine many year time and spatial variability of occurrence of main atmospheric deposits in the area of Pomerania. The studies were carried out on the basis of The IMGW (The Institute of Meteorology and Water Management) data including a monthly average number of days with dew, hoar frost, rime and glaze in 1971-2000, gathered in 16 meteorological stations in Pomerania...
At work was analysed impact different use on outflow drainage area. The investigations were guided in two drainage areas of the river Bukowa: Branew to profile Flisy used agriculturally and Czartusowa to Szklarnia typically forest. On the ground it the maximum discharges in period 1984-2000. From analyses is resulting the tendency of the increase in maximum annual discharges of WQ and maximum Qmax...
Studies were undertaken in a small valley reclamation object on environmental friendly water management which consisted in regulated water outflow during the whole year and subsoil irrigation during the vegetative period. These measures enabled to increase soil retention, protection of soils from degradation and the increase of yields of meadow vegetation.
New trends in water management in rural areas are observed in last years. It is believed that it is possible to regulate the water cycle in small river basis without hydraulic structures or using these structures in smaller extension. The protection or restoration of ecosystems such as forest, wetlands, soils together with construction of small water reservoirs, increasing water table in river, ditches...
This article contains research of composting of sediment of sewage with straw. The compost from this research doesn’t include too much heavy metals and is sanitarly safe. It characterize high concentration fertilizer substance and can be used in agriculture or in land reclamation.
Drought is usually considered to be a period in which the river flow decreases below the flow mean value. Most of information concerning the drought occurrence could be obtained on the basis of variation analysis of average and Iow river stages and flows. The rainfall as the main source of river supply is an essential factor determining the occurrence of dry years and drought years. Summary of Iow...
This report contains results from modeling computation of flood discharge in the W idawa River within the city area of Wrocław. Calculations were performed with the use of HEC-RAS ver.3.1.1. application program. The following initial data were entered to model: situation channel chart, geometrie data of cross-sections, geometrie data of hydrotechnical and communication structures, flow non-effective...
Paper presented analysis results of investigations of influence scale model on formation of scour in time. Investigations were conducted on two model this same taired constructions with the over of water under the closure, bottom of water basins and washing-out area. Models were made in two skales 1 : 30 and 1 : 55. In inwestigations were used this same eroded materiał on two models - sand. Estimated...
Contaminant transport in rivers is considered on the basis of tracer studies in Wkra small lowland river. Theories describing the spread of conservative and passive pollutants in the context of a longitudinal dispersion model was given. The analysis is limited to the one-dimensional cases of stationary transport of mass discharged into water flowing in river. It is shown that the model don’t agrees...
Basic messages were given to the chance to apply the Pertmaster Professional +Risk application for the subject in the article for the construction of network schedules and leading the analysis of the time. System requirements of the application, introducing data about activities, defining the relation between activities were characterized in paper. Possibilities were given to the presentation of the...
The synthetic estimation of environmental, economical and social conditions of Jeziorka River valley and catchment area (Mazowieckie Voivodship) in the sustainable development aspect was presented. The problems of proper area functioning and environmental protection were pointed out and the courses of following activities were proposed.
The paper presents the analysis between the PM10 concentration values measured at air ąuality monitoring station and meteorological elements in Ursynów WAU. The period of analysis covers 2002-2004. The results are presented in the form of figures and tables. Decrease of PM10 concentration was observed in the period since January 2002 to December 2004, although permissible level D24 was still exceed.
In the paper the methods of numerical approximation of the land surface are presented. The investigations prove that the methods of approximation which involve correlation between the terrain points having essential significance are presented also problem of estimation of the accuracy of approximation of the land surface and results of the investigation of accuracy of approximation of the land surface...
The paper focuses on permeability characteristics of medium and high plasticity clays in fully and not fully saturated state. Laboratory tests were carried out in triaxial apparatus capable of saturating a specimen by back pressure method. Actual permeability tests were done with use of flow pump technique. Experimental materiał gathered a this stage of the study explicitly shows that process of stabilising...
The influence of shrubs and trees growing on the floodplain was based on results of the discharge calculation. The discharges in described examples were calculated assuming the decrease of shrubs’ surface and concentration of vegetation. Ali the calculations of discharges were based on the guidelines of hydraulic applied by Union of Engineers of Water Management and Engineering Environment in German...
In this paper the method of the identification of sulphur dioxide inflow direction has been presented. This method is based on the circular graphs of percentiles (50, 60, 70, 80, 90, 95, 98) of sulphur dioxide concentration from measuring station in WAU campus. The measuring data of wind velocity and wind direction from this automatic station have been used to prepare 3D-roses of pollution.
The calculation method of discharges capacity in rivers and channels are based on the Manning-Stricklera and Darcy-Weisbach friction factors to represent local river bed stresses coupled with other fluid dynamic processes. This paper describes the comparison of the velocities computed with the use of both methods of the evaluation of friction factors. The velocities calculated within rough zone based...
In this paper, the results of permeability tests, which were done on organic soil, specifying of large strain and fiber structure are presented. In permeability tests the flow-pump technique was applicated. This technique is based on the constant discharge capacity of water flow in the soils sample instead of water pore pressure used in classical method of permeability coefficient evaluation. The...
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