In the experiment pit, the migration velocity was 2.27cm/d under an artificial condition of 5mm/h sprinkling intensity for 3 hours each day, the vertical diffusivity Dx was 7.75cm2/d.

• 在2m2实验坑中，以5mm/h喷淋强度每天喷淋3h的条件下，氚示踪剂以2.；27cm/d的速度向下迁移， DX为7