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Fresh Water Seas?
Topic Started: Mar 11 2016, 11:44 AM (362 Views)
xaritscin
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im working on a little sideproject related to a fantasy world. and i was thinking if its geologically possible to make a landlocked body of water that could be considered a sea, withouth having any trace of salinity.

basically, a fresh water sea is the topic says. my main idea was to make a supercontinent in the likes of Pangea with a huge rift stretching from north to south. this rift is a gigantic canyon in the likes of the Mediterranean. and the water is supplied by several rivers that originate from the icecaps far on the poles.

i was thinking of making it horizontal but i dont think the wind patterns would allow for precipitation in the center of the continent so it wouldnt fill enough. there's also the issue with gelogical patterns that i havent been able to figure out.


but yeah, the general concept is basically "Mediterranean without Salt"

i was actually looking on similar concepts online but i didnt found anything. so i came to the forums to ask.

NOTES: i was planning to put this in Science Central, but it seems the forum is mostly to post articles so didnt want to make such interruption..
Edited by xaritscin, Mar 11 2016, 11:44 AM.
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Russwallac
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Probably not; oceans are salty because they're where all the minerals collected by rivers end up. Any sufficiently large and long-lasting body of water will end up being salty.
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xaritscin
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adding a cavern system deep on the soil would allow for drainage?, this off course, speaking of sedimentary rock or something to make the water reach the underground passages. so they can later reach the ocean or something...
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LittleLazyLass
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Isn't the very definition of a sea that it is salty? Wouldn't this just be a big lake?
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I don't even really like this song that much but the title is pretty relatable sometimes, I guess.
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xaritscin
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it is but we're talking of a completelly different world so it could be normal for the folks living on it. since it would be larger than any lake they know in the rest of the continent.
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LittleLazyLass
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I don't see how it being on another world does anything to change the difference between a sea and a very large lake?
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According to Wikipedia, lakes can be saltwater. It is also states: "Seas are generally larger than lakes and contain salt water, but the Sea of Galilee is a freshwater lake. There is no accepted technical definition of "sea" among oceanographers"
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xaritscin
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yeah its kind of a strange and confussing thing. some lakes are salty, some "seas" are actually lakes, a freshwater sea the size of the Mediterranean is what im trying to get.

just wanted to see if it was feasible. and which mechanisms i could use to make it function as its supposed to be...
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A sea is a body of water in which there is a Dragon King. There are four seas.
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Mar 11 2016, 09:52 PM
A sea is a body of water in which there is a Dragon King. There are four seas.
That's only if you believe Draconic propaganda. There are seven seas and they are all ruled by a single king. A pirate king.
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Frankly, any lake large enough is a sea, at least to locals (see, Sea of Galilee)
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xaritscin
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out of the off topic material i have figured a small story about the formation of the Freshwater Sea. right now there are two conceptsa about it:

concept A: the central part of the supercontinent is tearing itself apart due to continental drift. the fissure has been enlarging for some million years since and each year it gets larger. many rivers that previously traversed around the continent are being redirected towards the bottom of the fissure. filling it meter per meter. not all of the water remains, and some new tributaries have been born from the water that escapes the fissure, transporting minerals towards the ocean. the salts and other elements left are absorbed by a series of caverns that have formed by the cooled magma and previously present limestone and sandstone, remnants of an ancient sea that was present before the continental fusion.

concept B: the continent joined some million years ago. enclosing a chunk of ocean in the center of it. due to geographical patterns, the landlocked sea has remained unscathed from most tectonical movement. and is one of the few water sources in the middle of the continent. however, its water has been loosing salinity due to several factors. the sedimentary layers at the bottom drain water into caverns, with many sending this water towards the sea. the icecaps send several rivers towards the center of the continent, which release their freshwater on the central sea, causing the creation of many secondary rivers that flow from the sea towards the other parts of the continent before reaching the ocean.

each concept has a different outcome in terms of its ecosystem. concept A would be mainly formed by organisms of freshwater ancestry, while concept B would be formed by organisms of oceanic ancestry which have somehow survived the loss of salinity on the water.

Edited by xaritscin, Mar 13 2016, 06:05 PM.
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