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CNAA / Theses / 2019 / June /

Assessment of the anthropogenic impact on pluvial floods of the rivers of the Republic of Moldova


Author: Jeleapov Ana
Degree:doctor of
Speciality: 11.00.11 - Environmental Protection and Rational Utilization of Natural Resources
Year:2019
Scientific adviser: Orest Melniciuc
doctor habilitat, associate professor (docent), Institute of Ecology and Geografy of the ASM
Scientific consultant: FINK Manfred
doctor în geografie (rerum naturalium), cercetător științific, lector, Universitatea Friedrich-Schiller din Jena, Inst itutul de Geografie, Germania
Institution: Institute of Ecology and Geografy of the ASM

Status

The thesis was presented on the 10 June, 2019
Approved by NCAA on the 27 September, 2019

Abstract

Adobe PDF document3.01 Mb / in romanian
Adobe PDF document2.95 Mb / in romanian

Thesis

CZU 556.166 (478)(043.2)

Adobe PDF document 14.33 Mb / in romanian
241 pages


Keywords

pluvial floods, hydrological and hydraulic modeling, anthropogenic impact, land cover, reservoirs, GIS. Field of study: geography, hydrology Study aim: assessment of changes in pluvial floods characteristics in conditions of anthropogenic impact.

Summary

The thesis consists of introduction, 4 chapters, general conclusions and recommendations, 264 references, 150 pages of basic text, 165 figures, 17 tables, 191 annexes. The obtained results are published in 23 scientific papers.

Research objectives: identification and estimation of changes in pluvial flood runoff regime under t he influence of anthropogenic activity on the basis of static methods; modeling of anthropogenic impact on flood waves generation and propagation processes of the pilot rivers using hydrological and hydrodynamic models; assessment of flood risk changes in conditions of environmental modifications.

Research methodology. The following methods were used to achieve the purpose and objectives of the study: comparative method, Indicators of Hydrological Alterations, Environmental Flow Components approaches, genetic method, volumetric method, Curve Number method (SCSCN), JAMS/J2000 hydrological model, HEC-RAS hydrodynamic model. Factorial analysis, GIS, and statistical methods were also applied in the research.

Scientific innovation and originality of the work: For the first time for the territory of the Republic of Moldova, flood runoff characteristics under stationary and non-stationary conditions were estimated and temporal dynamics of pluvial floods under the influence of land cover changes and reservoirs operations were determined. Flash floods, flooding and flood wave propagation potential was calculated and mapped. Using SCS-CN method, volumetric method and JAMS/J2000 physically-based fully distributed hydrologic model the impact of land use and agricultural activity on flood runoff characteristics was demonstrated. Using GIS and HEC-RAS model, the impact of climate change and hydro-technical constructions: reservoirs and levees on flood wave propagation through the river bed and floodplain and the spatial distribution of flood risk was estimated. The important scientific problem solved consists of assessment of changes in temporal and spatial charact eristics of flood runoff on the rivers of the Republic of Moldova caused by the anthropogenic activity.

Theoretical significance. Indicators of Hydrological Alterations and Environmental Flow Components were identified and comparatively analyzed and land use and reservoirs impact on flood runoff characteristics was assessed. Spatial distribution of the indexes of flash floods, flooding and flood wave propagation potential on the territory of the Republic of Moldova was modeled. The contribution of land cover types and agricultural activities in pluvial flood generation was estimated and modifications of flood wave generation and propagation processes under the action of hydrotechnical structures, climate change and land management were evaluated.

Applicative value of the research. Obtained results can be used for development of territorial planning activities for mitigation of maximum runoff, optimization of pluvial floods management, implementation of structural and nonstructural flood protection measures. Furthermore, the results can serve as methodological basis for improvement of national normative documents for determination of computed hydrological characteristics.

Implementation of scientisfic result. Digital maps on pluvial flood runoff were implemented by the Districts Councils of Glodeni and Faleshti for the development of the urban and territorial planning and management of the Camenca river basin. The obtained results were used for the sustainable management of water resources and hydrological risk situations, reservoirs operation optimization by the Basin Water Management Authority, ”Apele Moldovei” Agency.