Water distribution measurement in sand using sound vibration and SLDV

Tsuneyoshi Sugimoto , Yutaka Nakagawa , Takashi Shirakawa , Motoaki Sano , Motoyoshi Ohaba , Sakae Shibusawa

Now in agriculture, it tends to save the agricultural water as much as possible. Therefore, the irrigation method using the minus pressure difference of soil water attracts attention. This method has the nature keeping the water content inside the ground. In other words, when there are crops, it is the mechanism which supplies the water content which is same quantity with the water content that it absorbed. However, effective saving water is not able to be performed, because the water distribution in soil is difficult to grasp. Therefore, we propose a method of monitoring and imaging of the water content in the rooting zone using a sound vibration and the scanning laser Doppler vibrometer (SLDV). From the experimental result, we can confirm that the distribution of the propagation velocity was a very effective method to the water distribution which is in the shallow position near the ground surface. Also, in the experiment which used negative pressure irrigation, we can confirm that it was caught in the water distribution which changes time wise by measuring at both of the vibration measurement.

Mots clés: Water distribution; Volume water content; Propagation velocity; SLDV

Domaines: Acoustique [physics.class-ph]

Tsuneyoshi Sugimoto, Yutaka Nakagawa, Takashi Shirakawa, Motoaki Sano, Motoyoshi Ohaba, et al.. Water distribution measurement in sand using sound vibration and SLDV. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810605⟩