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CNAA / Theses / 2015 / July /

Modelling the spatio-temporal characteristics of river type ecosystems to optimize water quality parameters

Author: Marusic Galina
Degree:doctor of physics and mathematics
Speciality: 01.05.04 - Mathematical modelling, mathematical methods, software
Scientific adviser: Vasile Moraru
doctor, professor, Technical University of Moldova
Institution: Technical University of Moldova


The thesis was presented on the 4 July, 2015
Approved by NCAA on the 7 October, 2015


Adobe PDF document1.64 Mb / in romanian


CZU 681.5.013/681.511.26

Adobe PDF document 16.00 Mb / in romanian
253 pages


modelling, CFD (Computational Fluid Dynamics) simulation, Surface-water Modeling System (SMS), river, water quality, transport and dispersion of pollutants


6 . The thesis structure: introduction, three chapters, conclusions, bibliography containing 106 titles/sources, 6 Annexes, 120 pages of basic text, including 120 figures and 9 tables. Results are published in 13 scientific papers.

The field of the investigation is related to mathematical modelling, software programs and CFD modelling methods for the dynamic of pollutant spread evolution in river type aquatic systems.

The thesis aim: estimation of water quality parameters in river type systems by determining the spatio-temporal evolution of transport and dispersion of pollutants processes based on mathematical modelling, numerical models and software programs.

The objectives: determination of aspects related to turbulent flow regime in river type systems, identification, reasoning and application of mathematical models, numerical methods, and CFD simulation methods of transport and dispersion of pollutants in river type systems, software product development for the purpose of research and determination of water quality level.

Scientific novelty and originality of the results: mathematical models and CFD simulation methods of turbulent flow and pollutant transport processes in river type systems were identified, argued and applied. Calculation models for determination of spatio-temporal evolution of any pollutant were generated. Research results allow development of an integrated platform for appropriate management of water quality, with the possibility of real-time tracking and estimation of water quality parameters.

The scientific problem solved is to establish a methodology for estimating water quality parameters of river type ecosystems on the basis of mathematical models, software programs and modern methods of CFD simulation, which led to the possibility of assessing these parameters in the finite elements network nodes of the studied river sector, which has allowed to determine more accurately the water quality level and water pollution emergencies .

The theoretical importance: based on mathematical models, turbulent flow and processes of transport and dispersion of pollutants in river type systems were described. Numerical modelling resulted in elaboration of innovative solutions for concentration field determination of pollutants through time and space to estimate water quality parameters.

The applied value of the thesis: models for numerical calculations of transport spatio-temporal evolution and pollutants dispersion for Prut river eight sectors were constructed in premiere. A nucleus for elaborating an integrated platform for real-time estimation of water quality parameters was created. Research results can be applied in river type ecosystems that take chemical, phisical and microbiological charging.

The scientific results implementation took part in the State Hydrometeorological Service of the Republic of Moldova, SC Software and Informational Systems Bucovina from Suceava, Romania and Water Management System, Iaşi, România