On Mon, Sep 3, 2018 at 7:08 PM, Kevin Kenny <kevin.b.ke...@gmail.com> wrote:
it reasonable to draw 'coastline' on fresh water? There is going to be diffusion, although that will be dwarfed by tidal effects. And since ocean salinity comes from rivers washing salt out of the soil to the sea, careful measurements will find salinity far upstream. Not being a hydrologer, or a professional cartographer I would have thought tides had a part to play. I.e., where a river's high water mark fluctuates (roughly) twice daily or where flow is reversed in an estuary because of tidal flow. I expect somebody has a better definition. -- Paul
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