Those who said that when she becomes pure while on a journey, she performs tayammum and he may have intercourse with her

Ata said: When a menstruating woman becomes pure and does not find water, she should perform dry ablution (tayammum); after that her husband may have intercourse with her.

Al-Hasan said: If a woman is menstruating and sees purity while on a journey, she should perform dry ablution (tayammum) with earth. After that, her husband may have intercourse with her if he wishes.