Matematické modelovanie dynamiky snehovej pokrývky v horskom povodí pre potreby operatívnej hydrológie.

Abstract

The aim of this dissertation is to verify the suitability of models and its methods, which are used to simulate runoff from snowmelt for operational purposes. Three models have been investigated, first HYDROG used within the application sphere in the Czech Republic, then HEC-HMS providing more sophisticated solution of the problem and finally SWAT model for a better result comparison. All mentioned models utilise temperature index method or a modification of it to compute the amount of water released from snow. Method modification differs in parameters which can be added in the equation. Ostravice upper river-basin (upstream the profile Staré Hamry) was selected as the research area. According to HEC-HMS and HYDROG results it is possible to model suitable stream flow outputs by using precise input data and appropriate values of parameters in most cases. The more sophisticated implementation of temperature index method in HEC – HMS is also significant in model results, where better results were achieved in comparing simulated and observed discharge values in HEC – HMS compared to HYDROG. The result of SWAT model did not fit the nature of the process at all. The dissertation is divided into four parts. First part deals with theoretical background of the problem with emphasis on runoff from snowmelt for operational purposes. Second part includes dissertation objectives, research area allocation, and input data specification. Third part contains application of models for runoff from snowmelt modelling. The last part is a summary, which is made of knowledge, conclusions, results and contribution of the dissertation to solving the problem. A part of it is a possibility of next extension of the research.