NEW ORLEANS — Frustrated by term-limited Mayor Ray Nagin’s leadership of New Orleans since Hurricane Katrina, voters elected Louisiana Lt. Gov. Mitch Landrieu to succeed him Saturday, turning to a political scion to speed up the city’s recovery.

Landrieu, 49, became the majority-black city’s first white mayor since 1979, the year his father Moon left the office. The mayor-elect, a moderate Democrat, won in a landslide over a field of 10 opponents in a campaign that concluded as Carnival celebrations and preparations for the New Orleans Saints’ appearance in the Super Bowl took place.