Artificial Snowmaking Research Articles

Construction of a quantitative model for ski resort water demand and preliminary exploration of drainage irrigation pathways

In China, natural snowfall is insufficient, and ski resorts often require artificial snowmaking in winter and turf management in summer, which results in high overall water consumption and considered as one of the high water-consuming service industries, with an urgent need for theoretical foundations related to water management. Based on life cycle theory, we examined the characteristics of the water systems of ski resorts in winter and summer. A Monte Carlo simulation was used to construct a stochastic model to quantify the theoretical water consumption for snowmaking at ski resorts and to investigate the mechanisms by which various factors influence this consumption. We summarize the necessity of summer turf management and irrigation requirements at ski resorts, explore the interaction between ski resorts and agricultural irrigation. The results show that the theoretical water demand of ski resorts is basically consistent with the actual water consumption of ski resorts, that the constructed model is feasible, and that snowmaking water is the most important water use of ski resorts. Exploring the collection and reuse of meltwater or rainwater from ski resorts for agricultural irrigation in the spring and summer could provide more possibilities for the sustainable management of regional water resources. The research findings can provide a theoretical basis for scientifically and reasonably setting the norm of water intake for ski resorts and for developing comprehensive water resource management plans for ski resorts and agricultural irrigation.

Research Developments and Applications of Ice Slurry

Ice slurry is a phase-changing material composed of liquid water, ice crystals, and a freezing point depressant. It is finer and more uniform compared to ice cubes or flake ices and is used in many industries, such as food preservation, comfortable cooling, medical protective cooling, sport cooling, instrument cooling, firefighting, and artificial snowmaking, due to its high energy storage density. Ice slurry with high concentration can be used for cleaning equipment as its friction is several times greater than that of water at the same flow rate. This paper describes in detail the developments of ice slurry, including production methods, concentration measurement approaches, flow and heat transfer characteristics, as well as its applications in various industries. Problems to be solved or improved are also discussed, providing suggestions for better developments and applications in industrial environments.

La retorica della sostenibilità: indicatori territoriali e ricerca sul campo in Alta Valtellina

Abstract The Rhetoric of Sustainability: Territorial Indicators and Field Research in Alta Valtellina This paper compares statistical data on environmental sustainability with the governmental actions of the territory, which really affect the protection of the landscape and ecosystem elements. Case study is the Alta Valtellina, and the work focuses on Lago Bianco at the Gavia Pass, a remnant specimen of arctic tundra in the Stelvio National Park, exploited to capture water for artificial snow-making on ski slopes. This research shows the socio-cultural and economic dynamics underlying the relationship between mountain environment, protected nature, tourism and population, which recount experiences of vulnerability, lack of protection and conflict.

Global reduction of snow cover in ski areas under climate change.

Ongoing climate change substantially alters snowfall patterns with severe but diverging consequences for global ski areas. A global assessment as well as the investigation of potential implications for mountain ecosystems is currently lacking. We quantify future trends in natural snow cover days under different climate change scenarios until 2100 in seven major global skiing regions and discuss implications for mountainous biodiversity by analysing how natural snow cover days relate to regional human population density. Within all major skiing regions, snow cover days are projected to decrease substantially under every assessed climate change scenario. Thirteen percent of all current ski areas are projected to completely lose natural annual snow cover and one fifth will experience a reduction of more than 50% by 2071-2100 relative to historic baselines. Future skiable areas will concentrate in less populated areas, towards continental regions and inner parts of the mountain ranges. As skiable areas will be located at greater distances to highly populated areas in the future, we expect an expansion of infrastructure and increasing intervening actions (i.e., artificial snowmaking, slope grooming) to prolong snow duration. Our results are concerning for both the recreational and economic value of skiing as well as for mountain biodiversity since vulnerable high-altitude species might be threatened by space reductions with ski area expansion.

Weather, weekday, and vacation effects on webcam recorded daily visitor numbers in the alpine winter season

Winter tourism is an important economic factor in the European Alps, which could be exposed to severely changing meteorological conditions due to climate change in the future. The extent to which meteorology influences winter tourism figures has so far been analyzed mainly based on monthly or seasonal data and in relation to skier numbers. Therefore, we record for the first time daily visitor numbers at five Bavarian winter tourism destinations based on 1518 webcam images using object detection and link them to meteorological and time-related variables. Our results show that parameters such as temperature, cloud cover or sunshine duration, precipitation, snow depth, wind speed, and relative humidity play a role especially at locations that include other forms of winter tourism in addition to skiing. In the ski resorts studied, on the other hand, skiing is mostly independent of current weather conditions, which can be attributed mainly to artificial snowmaking. Moreover, at the webcam sites studied, weekends and vacation periods had an equal or even stronger influence on daily visitor numbers than the current weather conditions. The extent to which weather impacts the (future) visitor numbers of a winter tourism destination must therefore be investigated individually and with the inclusion of non-meteorological variables influencing human behavior.

Effects of geometric parameters on flow and atomization characteristics of swirl nozzles for artificial snowmaking

With the worldwide popularity of skiing, artificial snow technology has been gradually developed. Atomization is the key process for snowmaking, and swirl nozzles are applied as the core atomization components in snowmakers. In this research, the effects of nozzle geometric parameters on the flow and atomization characteristics are explored to improve snowmaking performance. The flow and atomization process in swirl nozzle is simulated by VOF-DPM approach after experimental validation. The results show that appropriate increase of orifice diameter and swirl slot area can effectively reduce the atomization droplet size and increase the spray flow rate. As the diameter ratio of swirl chamber to orifice decreases from 6.67 to 2.5, Sauter Mean Diameter (SMD) decreases by 54.9%, and mass flow rate increases by 168.2%. When orifice diameter is 4.0 mm, as the atomizer constant increases from 0.1688 to 0.3797, SMD decreases by 65.8% and mass flow rate increases by 114.3%. Furthermore, the reduction in SMD and the increase in spray flow rate are attributed to high discharge velocity. The swirl nozzles have the best atomization droplet size and maximum flow rate, as the inlet pressure is 0.6 -1.4 MPa, orifice diameter is 4.0 mm and swirl slot width is 2.25 mm.

Changes in Climate and Snow Cover in View of Functioning of Ski Resorts in Russia in the Early 21th Century

Received December 14, 2023; revised April 21, 2023; accepted June 27, 2023The development of winter ski tourism and characteristics of ski resorts in various regions of Russia are closely related to climatic conditions, the most important of which are the presence and duration of snow cover. For the period 2000–2021, a study of snow cover, availability of “optimal ski days” and climatic indicators necessary for artificial snowmaking at ski resorts located in different regions of Russia was performed, using data of the reanalysis ERA5-Land. The characteristics of snow cover and temperature from the reanalysis data were compared with data of the meteorological network. The ERA5-Land data for temperature, precipitation, and snow cover thickness are well synchronized with the observational data, and estimates of the error of trends in air temperature and snow cover depth according to the reanalysis data relative to the station data give satisfactory results. In the conditions of the current climate, the average and maximum thickness of snow cover in all resorts is sufficient for their functioning, but in 2000–2021, a decrease in both the maximum and average values of snow cover is noted in most resorts. The study shows that in terms of snow and weather conditions, the highest mountain resorts of the North Caucasus and Kirovsk (Murmansk region) are the most prosperous, where thickness of the snow cover and duration of its occurrence as well as a significant number of “optimal ski days” sustains stability of the resorts and creates favorable conditions for their further development.

SWIRLING FLOW AND BREAKUP CHARACTERISTICS AT HIGH REYNOLDS NUMBER IN A PRESSURE-SWIRL ATOMIZER FOR ARTIFICIAL SNOWMAKING

The pressure-swirl atomizer is used to provide atomized droplets, which is the main atomization component of the snowmaker. The formation of snowflakes is significantly affected by the effective collision between droplets and ice nucleus produced by ice nucleus generator. Whether the collision position moves forward or lags behind, it will both cause deterioration of the snow quality. Therefore, the flow and breakup process, breakup length, and variation law of atomization are very crucial for regulating the snow quality. The fully developed swirling flow at high Reynolds number in the pressure-swirl atomizer for outdoor snowmakers were investigated based on VOF-LES approach, and its accuracy was verified by experimental results. It was found that the Kelvin-Helmholtz instability caused by the velocity difference at gas-liquid interface decisively leads to the liquid film fragmentation. The primary breakup occurs after 5.4 ~ 5.8 times orifice diameter. As the injection pressure increases from 0.6 MPa to 1.4 MPa, the breakup length reduces by 7.7%, the jet velocity increases by 66.7%. It is critical to adjust the effective collision position and enhance the convection, so as to improve the quality of snow.

Analysis of the characteristics of the gas–liquid mixed artificial snow-making

This study investigates the heat and mass transfer of liquid droplets freezing in the process of artificial snow-making, and emphatically analyses the effects of droplet size, ambient temperature and relative humidity on the evaporative cooling and freezing of liquid droplets by establishing a theoretical model. On this basis, the critical droplet size for snow-making under different environmental conditions is obtained, and the accuracy of the droplet freezing model was verified by artificial snow-making experiments. Finally, by analyzing the density of artificial snow under different environmental conditions, the optimum gas-liquid mixing mass ratio (GLR) suitable for snow-making is obtained. The results show that the liquid droplets could be frozen under the action of self-evaporation and convection heat transfer with ambient. The time required for the droplet to be frozen completely shows a positive correlation with ambient temperature, relative humidity and droplet size. In the evaporation cooling stage, the droplet cooling rate increases with the decrease of ambient temperature, and in the phase transition stage, the time for the droplet resists the latent heat of phase transition increases with the increase of the droplet size. When the droplet size is smaller than the critical size for snow-making, the artificial snow can be achieved at a maximum temperature of 3 °C. The snow density decreases with the increase of GLR. And when the GLR is greater than 0.15, the snow density tends to be stable.

Magic of turning water into snow: Artificial snowmaking technology

Magic of turning water into snow: Artificial snowmaking technology

Artificial Snowmaking: Winter Sports Between State-Owned Company Policy and Tourist Demand

Due to changing climatic conditions, artificial snowmaking has become a major method of ski resort adaptation globally. It is a financially intensive operation requiring high start-up investment and involving operating costs that are dependent on weather conditions. Operational costs and the expansion of artificial snowmaking systems increase the price of ski passes. In our work, we analyzed the operations of a public company that operates the largest ski resorts in Serbia and directs the flow of winter sports tourism. We tried to determine, by means of correlation, the extent to which ski pass prices in the biggest winter resort in Serbia are influenced by factors such as natural snow cover, number of tourist overnights, ski run length, and local wages. The results of the survey indicate an increasing transformation of the ski resort into a thematic attraction independent of climatic factors in terms of determining ski pass prices.

Climate change in low mountain ranges: Opportunities in sustainable Black Forest tourism

The aim of this paper is to portray the risks of climate change for low mountain range tourism and to develop sustainable business models as adaption strategy. A mixed-method-approach is applied combining secondary analysis, a quantitative survey, and qualitative in-depth-interviews in a transdisciplinary setting. Results show, that until now, climate change impacts on the snow situation in the Black Forest – at least above 1,000 m – have been mild and compensated by artificial snowmaking, and up to now have not had measurable effects on tourism demand. In general, the Black Forest appears to be an attractive destination for more reasons than just snow. The climate issue seems to be regarded as a rather incidental occurrence with little importance to current business decisions. However, the authors present adaption strategies as alternatives for snow tourism, e. g. the implementation of hiking hostels, since climate change will make winter tourism in the Black Forest impossible in the long run.

Impact of ski run construction on atypical channel head development.

The development of ski infrastructure in mountainous areas has a significant impact on the development of erosion landforms and modification of existing landforms on slopes. The main purpose of our study was to determine the effects of ski run construction and artificial snowmaking on the development of channel heads and drainage lines as well as pattern of processes occurring along longitudinal profile of stream channel. The research was performed in the Remiaszów catchment on two ski runs in the Białczańska Kotelnica ski area (the Polish Inner Carpathians). Analysis of the location of the channel head of the Remiaszów Stream catchment over time was performed on the basis of multi-temporal DEMs generated using high resolution LiDAR data. The data were obtained via two ALS scans (Airborne Laser Scanning): before the 2013 and after 2016 ski run construction, as well as TLS (Terrestrial Laser Scanning) conducted in 2017 and in the course of fieldwork in 2018 using GPS RTK. The construction of ski runs leads to the formation of new channel heads, all of which develop in drainage ditches. Three distinct zones emerge in the longitudinal profile: 1) artificially concentrated flow zone, 2) forced, dispersed flow zone, 3) rejuvenated, concentrated flow zone. This means that two channel head formation zones become available in the longitudinal profile. Large inflows of water (200% or more) due to artificial snowmaking lead to bidirectional development of the valley network. In general, identification of the channel head pattern in area of ski run construction play important role in understanding of the sustainable development of mountain ecosystem.

Climate controls on snow reliability in French Alps ski resorts

Ski tourism is a major sector of mountain regions economy, which is under the threat of long-term climate change. Snow management, and in particular grooming and artificial snowmaking, has become a routine component of ski resort operations, holding potential for counteracting the detrimental effect of natural snow decline. However, conventional snowmaking can only operate under specific meteorological conditions. Whether snowmaking is a relevant adaptation measure under future climate change is a widely debated issue in mountainous regions, with major implications on the supply side of this tourism industry. This often lacks comprehensive scientific studies for informing public and private decisions in this sector. Here we show how climate change influences the operating conditions of one of the main ski tourism markets worldwide, the French Alps. Our study addresses snow reliability in 129 ski resorts in the French Alps in the 21st century, using a dedicated snowpack model explicitly accounting for grooming and snowmaking driven by a large ensemble of adjusted and downscaled regional climate projections, and using a geospatial model of ski resorts organization. A 45% snowmaking fractional coverage, representative of the infrastructures in the early 2020s, is projected to improve snow reliability over grooming-only snow conditions, both during the reference period 1986–2005 and below 2 °C global warming since pre-industrial. Beyond 3 °C of global warming, with 45% snowmaking coverage, snow conditions would become frequently unreliable and induce higher water requirements.

Victims of "adaptation": climate change, sacred mountains, and perverse resilience

<p>Resiliency and adaptation are increasingly prevalent in climate change policy as well as scholarship, yet scholars have brought forward several critiques of these concepts along analytical as well as political lines. Pressing questions include: who resiliency is for, what it takes to maintain it, and the scale at which it takes place. The concept of "perverse resilience", for example, proposes that resiliency for one sub-system may threaten the well-being of the overall system. In this article, I propose the related concept of "perverse adaptation", where one actor or institution's adaptation to climate change in fact produces aftershocks and secondary impacts upon other groups. Drawing on ethnographic and sociolinguistic research in northern Arizona regarding artificial snowmaking at a ski resort on a sacred mountain, I elucidate resort supporters' and others' attempts to frame snowmaking as a sustainable adaptation to drought (and, implicitly, climate change). I counterpoise these framings with narratives from local activists as well as Diné (Navajo) individuals regarding the significant impacts of snowmaking on water supply and quality, sacred lands and ceremony, public health, and, ironically, carbon emissions. In so doing, I argue that we must interrogate resilience policies for their unexpected "victims of adaptation."</p><p><strong>Key words: </strong>climate change policy, adaptation, perverse resilience, sacred sites, Diné (Navajo)</p>

Modelling investigation of water droplet evaporative freezing in artificial snowmaking

In this paper, a modelling investigation of water droplet evaporative freezing was conducted in order to better understand the snowmaking process and hence to optimise the design of the artificial snowmaking device. To this end, mass and heat transfer theoretical models of a single water droplet cooling in an air space were established and implemented in a numerical model developed using the software COMSOL Multiphysics. The effects of the air temperature, relative humidity and velocity and the water droplet initial diameter and temperature on this process were identified and analysed, and their appropriate ranges for the snowmaking were determined.

Analysis of freezing process about falling droplet using the lattice Boltzmann method

PurposeThe freezing phenomenon of a falling droplet is a frequently encountered phenomenon in various applications, such as spray crystallization, hail formation and artificial snowmaking. Therefore, this paper aims to understand the freezing processes of a falling droplet without and with initial horizontal velocity in a cold space.Design/methodology/approachThe freezing processes of a falling droplet were characterized using a modified enthalpy-based lattice Boltzmann method.FindingsThe temperature field, streamlines and freezing process of the falling droplet were investigated and analyzed. The lower part of the droplet was frozen earlier than the upper part. The freezing trend slowed down in the later stage of the freezing process. The droplet shape was related to the initial vertical velocity, nucleation temperature and initial horizontal velocity.Originality/valueA modified enthalpy-based lattice Boltzmann method is proposed. In the model, the improved pseudo-potential model is used and the radiation is considered. This method was firstly used to simulate the freezing process of a falling droplet. By examining these freezing processes in detail, the freezing trend and the effect factors of droplet deformation and freezing time were obtained, respectively.

Assessing potential winter weather response to climate change and implications for tourism in the U.S. Great Lakes and Midwest

Study RegionEight U.S. states bordering the North American Laurentian Great Lakes. Study FocusVariable Infiltration Capacity (VIC) model simulations, based on data from an ensemble of atmospheric-ocean general circulation models (AOGCMs) used for the Intergovernmental Panel on Climate Change's (IPCC's) Fifth Assessment Report (AR5), were used to quantify potential climate change impacts on winter weather and hydrology in the study region and understand implications for its tourism sector. New Hydrologic Insights for the RegionBy the 2080s, climate change could result in winters that are shorter by over a month, reductions of over a month in days with snow depths required for many kinds of winter recreation, declines in average holiday snow depths of 50 percent or more, and reductions in the percent area of the study region that would be considered viable for winter tourism from about 22 percent to 0.3 percent. Days with temperatures suitable for artificial snowmaking decline to less than a month annually, making it potentially less feasible as an adaptation strategy. All of the region's current ski resorts are operating in areas that will become non-viable for winter tourism businesses under a high emissions scenario. Given the economic importance of the winter tourism industry in the study region, businesses and communities should consider climate change and potential adaptation strategies in their future planning and overall decision-making.

Numerical investigation on freezing process of a single freefalling droplet based on the lattice Boltzmann method

The freezing phenomenon of a freefalling droplet widely exists in spray crystallization and artificial snowmaking. In this study, this process is investigated by an improved enthalpy-based lattice Boltzmann method. The latent heat of the phase change and the forced convection heat of the fluid flow are included in this model, respectively. The solid volume fraction is introduced in the particle distribution function of the migration equation. Firstly, it is validated through comparison with the analytical solution in a good agreement. Then the model is applied to study the temperature field, the solid volume fraction and the solid-liquid interface position in the droplet. Finally, the effect factor of the freezing time is tested via a series of numerical simulations.

Adapting to climate change: perceptions of vulnerability of down-hill ski area operators in Southern and Middle Finland

Climate change is likely to affect the tourism sector, particularly areas, such as snow-based tourism, that are directly dependent on climate and weather conditions. Especially vulnerable are low-lying ski areas. This study identifies the climatic factors that are crucial for economically successful operation of low-lying ski areas in Southern and Middle Finland and contemplates how these factors are seen to change with climate change. The study then analyses the preferences for and perceptions of adaptation strategies of downhill ski operators in terms of the adaptation measures they can implement or are willing to take. The findings indicate that climatic conditions set preconditions for the operation of the ski areas, but short-term operational prospects and inter-annual variability in weather conditions rather than foreseen changes in climatic conditions guide the operational decisions of the ski area operators. A key adaptation strategy to respond to uncertain snow conditions is artificial snowmaking, which lowers the vulnerability of the areas to the impacts of climate change too.