ATHENS — The Greek government said on Wednesday that it would replace intensely overcrowded migrant camps on the Aegean Islands with new centers that would be more restrictive of the migrants’ movements.

The step comes amid a continuing influx of new arrivals from Turkey. It is an effort by the new conservative government to tighten its control over migrant flows while also addressing conditions at the camps, including Moria on Lesbos and Vathi on Samos.

These conditions have become symbols of Greece’s, and Europe’s, inability to manage migration in an effective and humane manner.

But it was not clear that the new centers would do little more than redistribute a humanitarian crisis that has defied solution since the peak of the migration crisis in 2015 and 2016. At that time, more than a million asylum seekers fleeing economic hardship or wars in Syria, Iraq and Afghanistan arrived in Europe.