Valley complexes as ecosystem assets of heat island of urban agglomerations (on the example of the right-bank part of Kyiv)

  • Nataliia Pazynych Scientific Centre for Aerospace Research of the Earth of the Institute of Geological Sciences of the National Academy of Sciences of Ukraine, Oles Honchar st, 55-B, 01054, Kyiv, Ukraine https://orcid.org/0000-0002-0311-5917
Keywords: valleys, materials of space remote sensing, land surface temperature, isotherms, landscape-geomorphologic researches, profiling method, isolation exposition

Abstract

The analysis of the influence of the valley network of the right-bank part of Kiev on the formation of summer surface temperatures based on the use of materials of space remote sensing is carried out. The results of processing Landsat satellite images from 1987 to 2018, presented as isotherms, were used. Comparison of temperature data, hypsometry, geomorphologic features, types of earth cover was carried out according to profiles crossing the valleys in the most representative areas. The main factors influencing the formation of the temperature field within the valleys are vegetation, insolation exposure and anthropogenic stress. The studies revealed the lowest temperatures in the valleys at the foot of the slopes of the northern exposure, covered with woody vegetation. It was established that the temperatures in the valleys with wood cover are 5–6С and lower than the temperatures on the built-up water divide and 2–30С lower than in the park zones on the water divide. As a result of the peculiarities of the internal atmospheric circulation, stagnation in the valleys, with significant anthropogenic pressure (buildings, highways, railways), positive thermal anomalies and even geochemical ones are formed. Unfavorable ecological conditions (high level air pollution, flooding of foundations) are formed on the river Lybid and Kiyanka stream. Due to climatic changes and constantly growing anthropogenic pressure (increase in the area of impermeable surfaces, density and number of storey of residential buildings), temperatures within the city's “thermal island” for the study period increased by an average of 2–30С. Preservation of the valley network in its natural state provides a kind of oases within the city with favourable microclimatic and recreational conditions.

References

Filipovych, V. Je., Krylova, Gh. B. (2014). Investigation of the thermal field of the city of Kyiv according to the data of space sensing in the IR range as a component of the analysis of the ecological condition of the urbanized area. Scientific Proceedings of the 13th International Scientific and Practical Conference Modern Information. Technologies for Environmental Safety, Nature Management, Emergency Measures, 2014, Kyiv, Puscha-Voditsa, P. 16–28. (in Ukrainian)

Gorny, V. I., Kritsyk, S. G., Latypov, I. Sh., Tronin, A. A., Kiselev, A. V., Brovkina, O. V., Filippovich, V. E., Stankevich, S. A,. Lubskii, M. S. (2017). Thermophysical properties of the of land surface in urban environment by satellite remote sensing of St. Petersburg and Kiev). Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa. 14 (3). 51–66. DOI: 10.21046/2070-7401-2017-14-3-51-66. (in Russian).

Krylova, Gh. B. (2014). Monitoring of the formation and development of the thermal island of Kiev city. Ukrajinsjkyj zhurnal dystancijnogho zonduvannja Zemli, 2. 35–37. Retrieved from: https://ujrs.org.ua/ujrs/article/view/19/40. (in Ukrainian).

Pazinich, N. V., Lischenko, L. P., Mychak, A. G., Filipovich, V. E., Teremenko, A. N. (2015). Decision of task of ecological geomorphologic in the Kiev city with the use of remote sensing data (on the example of Lybyd river valley). Ukrajinsjkyj zhurnal dystancijnogho zonduvannja Zemli, 5. 33–36. Retrieved from: https://ujrs.org.ua/ujrs/article/view/49/68. (in Ukrainian).

Piestova, I. O., Lubskyi, M. S., Svideniuk, M. O., Golubov, S. I., Laptiev, O. A. (2019). Urban thermal micromapping using satellite imagery and groundtruth measurements: Kyiv city area case study. Ukrajinsjkyj zhurnal dystancijnogho zonduvannja Zemli, 21. 40–48. Retrieved from https://ujrs.org.ua/ujrs/article/view/149/172. (in Ukrainian).

Sumit Khandelwal, Rohit Goyal, Nivedita Kaul, AneeshMathew. (2018). Assessment of land surface temperature variation due to change in elevation of area surrounding Jaipur, India. The Egyptian Journal of Remote Sensing and Space Science, 21 (1). 87–94. DOI: https://doi.org/10.1016/j.ejrs.2017.01.005 Get rights and content.

Vyshnevsky, V. I. (2013). Small rivers of Kyiv. K.: Interpress LTD. (in Ukrainian).

Section
Earth observation data applications: Challenges and tasks