A blueprint outlining how San Francisco Bay communities should combat sea level rise was released early Thursday by ecosystem scientists and urban planners who envision a ring of man made reefs, rocky beaches and graded marshlands around the largest estuary on the Pacific coast. The carefully designed features, outlined in the 255-page San Francisco Bay Shoreline Adaptation Atlas, would in many cases replace or bury seawalls, rip rap, culverts and other crude fortifications that experts say won’t hold up as the climate warms and water rises.