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In 2020, the authors of this paper carried out a study on the Maly Taldykol lake group, located in the south-western planning region of Nur-Sultan. The purpose of this work was to conduct an assessment of ecosystem services to inform effective management decisions in urban planning. A strategy of combined research methods was applied. Because of the lack of data, the challenge was to explain, summarize, and verify the data obtained by one method through the application of another method. Analysis of the data showed that the annual costs associated with the creation of artificial "islands of nature" through the expansion of green areas is 20 times less than the losses associated with the development of the territory of Maloe Taldykol and the consequential loss of natural landscape.The results revealed that keeping these ecosystem services in their natural setting reduces the cost of providing these services in an alternative way, and avoids the negative impact of an ill-conceived decision. The uniqueness of this interdisciplinary study lies in the cost-benefit analysis of the findings of the assessment of ecosystem services, which result in the most effective management decisions in urban planning.

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In this paper, the models of Euler–Bernoulli beams on the Winkler foundations are considered. The novelty of the research is in consideration of the models with an arbitrary variable coefficient of foundation. Qualitative results that influence the symmetry of the coefficient of foundation on the spectral properties of the corresponding problems are obtained, for which specific variable coefficients of foundation are tested using numerical calculations. Three types of fixing at the ends are studied: clamped-clamped, hinged-hinged and free-free. The conditions of the stiffness and types of beam fixing have been found for the set of eigenvalues of boundary value problems on a full segment and can be represented as two groups of the eigenvalues of certain problems on a half segment. Such qualitative spectral properties of a mechanical system can contribute to the creation of various algorithms for nondestructive testing, which are widely used in technical acoustics.