Suppose some magical civilization on Earth-like planet can create portals. Any given portal entrances are spherical surfaces of the same radius. Any particle enters one sphere and exits another in the corresponding spots. Inside space of the portal is corridor of Plank length with no gravity field. I'm aware of implication for energy conservation and causality, just accept it. This civilization decides to use this property in order to irrigate local version of Sahara desert.
One portal entrance is placed deep under the sea surface covered with layers of semi-permeable membranes, while another one - in the Desert, so the high pressure of ocean depth pushes water through membranes performing desalination by reverse osmosis. This civilization built several large such portals that work as sources of designed major rivers and myriads of small ones to keep water levels constant in artificial lakes and groundwater. What are ecological implication of this system?
The world has essential the same geography as ours and the Desert in question is has roughly the same parameters (size, temperature regime, etc) as Sahara. Quantity of water continuously going through system comparable to discharge of Amazon river. Oceanic entrances of the portals are placed in the ocean current in order to minimize rise of water salinity in the vicinity. The long term ecological issues, that I concerned with:
- Heat pollution. Such system breaks the law of conservation of energy and all kinetic energy, that water get's for free, will eventually turn into heat. Is this a crucial problem in this system?
- How significant will be rise of water salinity?
- How drainage will affect marine life, most importantly plankton that can't resist suction? Is periodical scraping of membranes is enough?
- Will it significantly disrupt global climate with all this water evaporation?