- #1
Stryke
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Hi folks!
English is not my native language so please excuse my bad grammar. I am a geology student working on a project about a lake when an interesting puzzle piece - a newspaper article from 1844 - came up. This is not homework and I don't even know if a solution exists to my question at all, so I hope this is the right forum section. If not, I apologize and don't mind it being moved elsewhere.
So here it goes:
The Laacher See is a lake in a volcanic crater with no natural outflow that is always fully saturated with CO2.
In 1844, the local council people decided to build a canal through the crater wall to lower the water level and claim land for agriculture. During the year (the exact time and speed at which this happened is unkown, most likely 3-5 weeks) the water level was lowered by about 7 meters.Now it gets fascinating - a newspaper article from July 1844 from an unnamed eyewitness claims to have seen billowing dirty water, weird smells and sounds, as well as dead animals on the shore. At that time, it was dismissed as complete fantasy.
The first thought that comes to mind is that the lower water level decreased the pressure at the bottom which in turn decreased the CO2 solubility which created a big CO2 bubble. Like opening a soda can.
The thing is - something like this happened in 1986, which killed 2000 people near a Lake in Africa. But the situation might be different, in Africa the event was triggered by a sudden landslide, whereas in this case it was more like a few weeks.I don't know if my line of thinking is physically sound. If it is, I would like to calculate the amount of CO2 released. The figures are at the bottom of this post. I've tried getting my head around applying the Henri Law of Gases, but I am not very good around non-mechanical physics.
Any help or suggestions are tremendously appreciated! Maybe we can solve this mystery together.Data:
Depth before lowering: 60.8 meters
Amount of lowering: 7.48 meters
Surface elevation (new) is 275 m above sea level.
The lake is nearly half-sphere-shaped.
Area before: 3,875,643 sq meters
Area after: 3,327,903 sq meters (not sure if these last 2 numbers matter)
English is not my native language so please excuse my bad grammar. I am a geology student working on a project about a lake when an interesting puzzle piece - a newspaper article from 1844 - came up. This is not homework and I don't even know if a solution exists to my question at all, so I hope this is the right forum section. If not, I apologize and don't mind it being moved elsewhere.
So here it goes:
The Laacher See is a lake in a volcanic crater with no natural outflow that is always fully saturated with CO2.
In 1844, the local council people decided to build a canal through the crater wall to lower the water level and claim land for agriculture. During the year (the exact time and speed at which this happened is unkown, most likely 3-5 weeks) the water level was lowered by about 7 meters.Now it gets fascinating - a newspaper article from July 1844 from an unnamed eyewitness claims to have seen billowing dirty water, weird smells and sounds, as well as dead animals on the shore. At that time, it was dismissed as complete fantasy.
The first thought that comes to mind is that the lower water level decreased the pressure at the bottom which in turn decreased the CO2 solubility which created a big CO2 bubble. Like opening a soda can.
The thing is - something like this happened in 1986, which killed 2000 people near a Lake in Africa. But the situation might be different, in Africa the event was triggered by a sudden landslide, whereas in this case it was more like a few weeks.I don't know if my line of thinking is physically sound. If it is, I would like to calculate the amount of CO2 released. The figures are at the bottom of this post. I've tried getting my head around applying the Henri Law of Gases, but I am not very good around non-mechanical physics.
Any help or suggestions are tremendously appreciated! Maybe we can solve this mystery together.Data:
Depth before lowering: 60.8 meters
Amount of lowering: 7.48 meters
Surface elevation (new) is 275 m above sea level.
The lake is nearly half-sphere-shaped.
Area before: 3,875,643 sq meters
Area after: 3,327,903 sq meters (not sure if these last 2 numbers matter)