Obodovskyi I. Hydromorphoecological assessment of the river bed processes and water-and-power potential of rivers in the upper Tisza river basin (within Ukraine).

The assessment of the basin river water runoff (average, maximum and minimum water consumption) and analysis of the observation series homogeneity under the following main criteria: z, Student’s, and Wilcoxon’s were implemented. A comparative analysis of the average daily and time-fixed maximum water consumption (rainfall and snow-rainfall floods) of the basin rivers is fulfilled. The transitional coefficients for these consumption are defined, which are 1,6 (160%) for the low mountain rivers and 1,8 (180%) for the middle mountain. Analysis of the fluctuations of flow water content (minimum annual, average annual and maximum annual water consumption) of the rivers of the specified water catchment area. 20 Identification and typology of the basin river water massifs in the format of European standards is carried out. A hydromorphological assessment of the ecological state for 10 water massifs of rivers of the specified water catchment area is established for 23 research areas (RA). The analysis of river bed formation water consumption rates is implemented according to the methods of Ukrainian Hydrotechnics and Reclamation Research Institute (UkrNDIGiM) – Kyiv National University (KNU) and methodology of of N.I. Makkaveev. The hydromorphodynamic assessment of the river bed formation processes was investigated and factor analysis of the morphometric and hydromorphodynamic characteristics of the research areas was carried out, which demonstrated the identification of three main factors of the river bed formation processes of the researched rivers. The functional dependencies of the river bed parameters are analyzed by means of combined curves of dependencies. The analysis of river bed deformations (vertical and horizontal) is implemented by means of combined cross-sections of the river bed according to the data of hydrological posts. The assessment of the types (in terms of classification of river bed types according to the nature of river bed transformations and their morphological manifestations, and according to expeditionary research data) has been carried out and five main types have been identified: 1) sill-waterfall beds (43,6% of the length of all river beds); 2) river beds with undeveloped alluvial forms – 41,1% of the length of all river beds; 3) river beds with developed alluvial forms – 12,8%; 4) river bed multiple arms - 1,5%; 5) entrenched meanders – 1,0% of the length of all beds. The stability of river beds is assessed by means of indicators by O.G. Obodovskyi (Ло), K.V. Gryshanin (Мх) and I.F. Karasyov (Ке). It was found that according to the indicators by Obodovskyi (Ло) and Gryshanin (Мх) the largest stability is inherent in the river beds with undeveloped alluvial forms, and the least stability is typical for sill-waterfall beds, which may be stipulated by sharp increase in slopes and thickness of sediments.