Ground Type
The type of ground beneath an evaporating puddle influences the amount of heat energy transferred from the ground to the puddle, which in turn affects the evaporation rate. As ALOHA estimates heat transfer from ground to puddle, it assumes that the spilled chemical is not absorbed into the ground (or dissolved into the water if the chemical is spilled onto water).
You can choose from 5 different ground types for evaporating puddles; choose the default soil option if you don't know which ground type to choose.ALOHA offers you five choices for ground type; choose the type that most closely describes the area where the evaporating puddle has formed. (Note that descriptive terms like dry or moist refer to the state of the ground before the chemical was spilled—that is, the amount of water in the soil.)
Default soil: unwetted soil not covered by rock or concrete
Concrete: concrete, cement, asphalt, or otherwise paved surfaces
Sandy dry soil
Moist sandy soil
Water: lakes, oceans, or other large bodies of water
Of the land-based types, ALOHA expects heat to be transferred most readily from default soil or concrete surfaces, and least readily from sandy ground. However, the heat transfer from water is generally greater than that of any other ground type. Ground type is most important when the spilled liquid is cryogenic. Cryogenic liquids, such as liquid nitrogen, are liquids that are stored at very low temperatures because they boil at temperatures well below ambient.
Ground TypeThe type of ground beneath an evaporating puddle influences the amount of heat energy transferred from the ground to the puddle, which in turn affects the evaporation rate. As ALOHA estimates heat transfer from ground to puddle, it assumes that the spilled chemical is not absorbed into the ground (or dissolved into the water if the chemical is spilled onto water).You can choose from 5 different ground types for evaporating puddles; choose the default soil option if you don't know which ground type to choose.ALOHA offers you five choices for ground type; choose the type that most closely describes the area where the evaporating puddle has formed. (Note that descriptive terms like dry or moist refer to the state of the ground before the chemical was spilled—that is, the amount of water in the soil.)Default soil: unwetted soil not covered by rock or concreteConcrete: concrete, cement, asphalt, or otherwise paved surfacesSandy dry soilMoist sandy soilWater: lakes, oceans, or other large bodies of water Of the land-based types, ALOHA expects heat to be transferred most readily from default soil or concrete surfaces, and least readily from sandy ground. However, the heat transfer from water is generally greater than that of any other ground type. Ground type is most important when the spilled liquid is cryogenic. Cryogenic liquids, such as liquid nitrogen, are liquids that are stored at very low temperatures because they boil at temperatures well below ambient.
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