Approaches to assessment and GIS-mapping of sustainability and environmental well-being of geosystems. Integral assessment of ecological status of fluvial systems
DOI:
https://doi.org/10.21638/spbu07.2019.201Abstract
The theoretical and methodological aspects and the experience of using of the methods for characteristics of ecological status (ES) of the fluvial systems are considered. The problems of development of multilevel and multi-criteria classifications of ES; stages and results of assessment research are discussed. Evaluation of ES can be performed on the basis of biocentrism in the study of fluvial systems or anthropocentric approach that takes into account the planning of fluvial systems use for various purposes with special attention to conservation of environment and resource reproduction. Such approach determines the axiological basement and the choice of necessary and sufficient criteria and evaluation priorities. The assessment scales were developed with considering of each component evaluation and indicator approach and can use incomplete, inaccurate, non-numerical assessments data. It was concluded that ES is an example of system emergent property that combines its ability to produce organic substances in accordance with the natural history of fluvial systems, to maintain high quality of the habitat and biota, high biodiversity, resistance to changes of natural conditions and anthropogenic impacts; high velocity of the system to natural purification and low velocity of pollution and acidification and maintaining of outlined system properties during the long time period. This research is focused on the development of models for quantitative integral assessment of fluvial systems state, their systemic properties that are characterized by the emergence of new functional units (integral indicators of different groups, summarizing indicators) that reflect the system integrity, serve as the base for taxonomy, and allow to compare the state of systems in space and time. Integral assessment assumes the implementation of assessment with some uncertainty, taking into consideration different phases of the unification of multicriterial preliminary assessments with evaluation of their significance for overall assessment. This may take into account the significance of various indicators and their input to consolidated value. The development of integral indicators of ES is discussed in hypothetical examples of the “river-drainage area” systems and on the base of assessment of ES of the river itself (Msta River) and its drainage area (landscape).
Keywords:
integral assessment, ecological status, fluvial system, system “river-drainage area”, ecosystem stability
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Articles of "Vestnik of Saint Petersburg University. Earth Sciences" are open access distributed under the terms of the License Agreement with Saint Petersburg State University, which permits to the authors unrestricted distribution and self-archiving free of charge.