Stations of the Tide — Michael Swanwick

The "Jubilee Tides" will drown Miranda beneath the weight of its own oceans. But as the once-in-two-centuries cataclysm approaches, an even greater catastrophe threatens this dark and dangerous planet of tale-spinners, conjurers and shapechangers. For Gregorian has come--a brilliant renegade scientist and bush wizard who, with magic and forbidden technology, plans to remake the rotting, dying world in his own evil image... and force it toward an astonishing and terrifying confrontation with death and transcendence.