Problems of recreational load on coastal zone of lakes Aya and Kolyvanskoye and Novosibirsk reservoir

The assessment of recreational load on the coastal zone of natural and man-made reservoirs (i.e. Novosibirsk reservoir,lakes Aya and Kolyvanskoye) situated in the south of Western Siberia was performed. These water bodies are typical recreation andtourism objects with shores extremely vulnerable to recreational loads exceeding natural self-restoration potential. The assessment ofrecreational load was based on well-known estimation methods of recreation digression stages by N.S.Kazanskaya, local sites by Ye.G.Sheffer, evaluation of recreational potential and stability by E.A. Repshas as well as on the interim method for estimation of recreationloads on natural complexes by the USSR State Committee on Forestry. The recreational load on Novosibirsk reservoir was determinedwith the E.A. Repshas method for evaluation of recreational potential and stability. The work consisted in the estimation of 13 indices ofrecreational load on the 5-point scale and the calculation of the coefficient of changeability using specific formula for each coastal recreationalzone. The assessment showed that the coastal recreational zones under study referred to the 3rd, 4th or 5th level of the vegetationcover recreation digression. The coastal recreational zones with good transport availability for vacationers displayed higher recreationdigression. The investigations within Lake Aya were carried out with the Ye.G.Sheffer method of local sites and the one of recreationdigression stages by N.S. Kazanskaya. Here, natural complexes served as the object for evaluation of recreational load. The reducedformulae were used for calculation of recreational load on 6 natural complexes where field observations took place. The recreationalload on three natural complexes within Lake Aya exceeded the permissible one, that refers to the 3rd or 4th level of recreation digression. The strongest impact was registered on the coastal natural complexes (14.3 and 0.25 people/ha). The assessment of recreationalload within Lake Kolyvanskoye was performed using the methods of local sites by Ye.G. Sheffer and the recreation digression stages byN.S. Kazanskaya. The load was evaluated on the north, north-east, south-east, south-west and west coasts of the lake. The south-eastcoast of Lake Kolyvanskoye demonstrated the 2nd level of recreation digression. The 3rd level was revealed on the north, north-west,west, south-west coasts. Relying on the data obtained, one can draw inferences about the inadmissibility of the present recreational loadon natural complexes of Lake Kolyvanskoye. The recreational coasts of natural and man-made reservoirs situated in the plains or mountainsof the south of Western Siberia undergo intensive recreational load. All these sites are in need of restricted access, further developmentand application of nature conservation measures.

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