The method of application of limited inverse problems to determine admitted chemical concentration on the soil surface is elaborated. The process of transport of pollutants soluble in soil water is described by the hydrodynamic dispersion equation. The method lets for restoring the border condition on the soil surface. This is obtained on the bases of the concentration changes in the selected depths during the process. The example of method application is presented when the soil moisture and flow rate are spatial and time variable. The converges of the method has been investigated. ...
Vegetation growing in the River Bed is strongly influencing flowing condi-tion. Effective flow section is reduced, velocity field is disturbed and flow resistance is increased. Its consequence is change of water level and depth in comparison with flow in river bed without vegetation.Equations of momentum conservation in river bed with trees based on a concept of whirly viscosity proposed by Rowiński and Kubrak [2002] are one of mathematical description of vegetation hydraulic influence. Above equations were solved using implicit and explicit differential scheme to determine flow velocities distribution in vertical profile. Accuracy of proposed algorithms was tested by comparing numerical solutions with detailed analytical solution obtaining very good conformity. Velocity distribution calculated on the base of the model was used to determine volume of the flow. To evaluate possibilities of using developed model for calculation concern-ing small rivers with vegetation, some filed investigation on one section of Ślęganina river were carried out. Despite of geodetic measurements, some profiles of local flow velocities for vegetated and free of plants sections were made. Field measurements results were used for verification of mathematical model based on equations of momentum conservation.
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For the assurance stability of the ground hydroengineering buildings (structures),it is indispensable to base real filtration conditions of these objects. On the base of computer results of calculation filtrations parameters, and comparative reserches on the phisical model, has been consolidated relations beetwen spatial and flat hydrodynamic pressured filtration, determined under the same hydrogeologic conditions. These relations let to consolidate the real value of hydrodinamic filtrations made on flat models, by passing over in the most important areas, real spatial character of filtration. ...
