Blizzard

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Default-person Ying Chen (Author)

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Model was written in NetLogo 4.1.2 • Viewed 233 times • Downloaded 15 times • Run 0 times
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WHAT IS IT?

This NetLogo project aims to emulate blizzard conditions. It has several functions that can be altered by the user _wind, temperature, and amount of precipitation.

HOW IT WORKS

The precipitation begins at the top of the simulation, and moves from top to bottom. Depending on the other factors such as temperature of the precipitation and wind, different behaviors emerge.

HOW TO USE IT

First, use the controls to setup wind, amount of precipitation, and temperature.

Next, click setup. The simulation window changes to represent the sky and ground.

Click the go button and observe what happens!

If you would like to change any of the controls, press go to stop the simulations, adjust the controls, click setup, and then press go.

THINGS TO NOTICE

Which controls dictate which aspects of the model? Does anything special happen to the simulations as the temperature increases?

THINGS TO TRY

Set the temperature to just above freezing. Snowflakes are no longer solid, they are raindrops. What happens to the raindrops at the bottom of the simulations is different than what happens to the snowflakes.

EXTENDING THE MODEL

An interesting idea to extend this model would be to have the snow and rain mix at an optimal temperature.

Another idea would be to add a _elt_feature in which after a certain number of ticks the snow melts, freezes, and then it rains.

A third idea would be to incorporate ground temperature as a control and explore how that effects snowflake collection on the ground.

NETLOGO FEATURES

The sky and ground are patches while the snowflakes and raindrops are turtles. When a snowflake hits the ground, it changes into a _ead-snowflake_and collects on the ground.

RELATED MODEL

Evaporation is caused when water is exposed to air and the liquid molecules turn into water vapor, which rises up and forms clouds. Also, this model relates to fire model in models library. The precipitation process decreases the chance of a fire spread through a forest.

Comments and Questions

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Click to Run Model

breed [snowflakes snowflake]
breed [dead-snowflakes dead-snowflake]
breed [raindrops raindrop]

snowflakes-own[
  location
]
raindrops-own[
  location
]

to setup
  clear-all
  set-default-shape snowflakes "circle"
  set-default-shape raindrops "circle"
  ask patches 
   [ set pcolor blue - 3 ]
  ask patches with [pycor < min-pycor + 3]
   [ set pcolor brown]
  do-plot 
end 

to go
  wind
  if temperature > 32
     [rain]
  if temperature <= 32
     [storm
      land
     ]
  tick
  do-plot
end 

to wind
  ask snowflakes [ ifelse random 2 = 1
                   [ rt 10 * wind-speed ]
                   [ lt 10 * wind-speed ]
                 ]
  ask raindrops  [ ifelse random 2 = 1
                   [ rt 10 * wind-speed ]
                   [ lt 10 * wind-speed ]
                 ]
end 

to storm
  create-snowflakes snow-intensity [
    setxy random-xcor max-pycor
    set heading 180
    fd 0.5 - random-float 1.0
    set size .25
    set color white
    set location "falling"
    
  ]
  ask snowflakes [ fd random-float 2]
end 

to rain
    create-raindrops rain-intensity [
    setxy random-xcor max-pycor
    set heading 180
    fd 0.5 - random-float 1.0
    set size .25
    set color [84 84 84]
    set location "falling"
    
  ]
  ask raindrops [ fd random-float 2]
end 

to land
  
  ask snowflakes with [ ycor <= -13.5]
   [ set breed dead-snowflakes ]
end 

to do-plot
  
  set-current-plot "weather"
  
  set-current-plot-pen "temperature"
  plot temperature
  
  set-current-plot-pen "wind"
  plot wind-speed
    
  set-current-plot-pen "rain"
  plot rain-intensity
  
  set-current-plot-pen "snow"
  plot snow-intensity
end 

There is only one version of this model, created over 8 years ago by Ying Chen.

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