ON A NEW SET OF RULES “ENGINEERING SURVEYS FOR CONSTRUCTION IN AVALANCHE-PRONE AREAS. GENERAL REQUIREMENTS

Section
Issues of improving regulatory documentation
Keywords: government regulations, avalanche danger, characteristics, calculation methods, assessments, accuracy, validity
(+) Abstract

The first national document containing the rules for avalanche danger assessing: «Guidelines for calculating avalanche loads in the design of structures. VSN 02-73», appeared in Russia in 1973. Despite many shortcomings, it was used until recently. In 2018, new rules for avalanche danger assessing: «SP 428.1325800.2018. Set of rules. Engineering surveys for construction in avalanche-prone areas. General requirements» were worked out. Some of the shortcomings of the previous document were eliminated in it. Used terms and definitions are given. For the first time in a regulatory document, a method for identifying of avalanche starting zones is presented. The conditions under which an avalanche danger assessment is required are formulated more correctly. The method for calculating the speeds and runouts of flowing avalanches, which was in the previous document, has been excluded. The rules allow, in case of insufficient data for analysis, to calculate the maximum possible avalanche path boundaries, but not the boundaries of the specified probability. New sections have appeared on the application of aerospace, phytocenotic, dendrochronological methods, as well as methods for studying buried soils to assess avalanche danger. At the same time, there are contradictions and shortcomings in the new rules. Clearer and mono-semantic terms and definitions are needed. Method for estimating the speed of powder avalanches is insufficiently substantiated and give greatly overestimated values. There is no sufficient rationale for determining the boundary of the air wave (powder avalanche) impact. The methods for assessing snow accumulation in an avalanche starting zone do not take into account the spatial variability of the snow depth and can lead to large errors in the assessment of avalanche danger. The use of statistical modeling to assess the probabilities of avalanches and their characteristics, in the proposed form, is not correct and can lead to an underestimation of the avalanche hazard. One of the reasons for the imperfection of the new document is the lack of requirements for the accuracy of the estimates performed with its help. It is proposed to discuss the document content and its possible changes more broadly and substantively by the time the set of rules update.

(+) About the author(s)

Pavel A. Chernous,
Special Research Bureau for Automation of Marine Researches, Far East Branch of Russian Academy of Sciences, Yuzhno-Sakhalinsk, Russia

eLibrary (РИНЦ) SPIN-код: 9801-3555

ORCID ID: 0000-0002-6006-5717

Scopus ID: 57195006512

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Published
2021-07-01
How to Cite
Pavel A. Chernous. (2021). ON A NEW SET OF RULES “ENGINEERING SURVEYS FOR CONSTRUCTION IN AVALANCHE-PRONE AREAS. GENERAL REQUIREMENTS. Hydrosphere. Hazard Processes and Phenomena, 3(2), 145-154. https://doi.org/10.34753/HS.2021.3.2.145

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