水中及び砂内の流体観察・流量測定

概要

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We are aiming at highly productive ways for superior quality vegetable crops raised at low cost. In growing the vegetable crops, the water movement around the roots is a matter of deep interest. The present experimental work deals with the behavioral pattern of water flowing through soil. We have examined how water flows through mediums like water and sand. First under the monitored condition, we checked the movement of colored water inside different sized water filled aquariums (360,000 mm3 - 1,500,000 mm3). Also we have measured the rate of water discharge for wet and dry quartz sand of grain grade 4. The recharge rates were 20 ml/min, 25 ml/min and 30 ml/min for both water and sand mediums. It was seen for the water medium that, as the aquarium size becomes bigger the water spreading behavior greatly depends on the recharge flow rate whilst for smaller sized aquariums, the colored water spread throughout the aquarium. For quartz sand mediums it was found that the flow rate is higher at closer portions to the center where the water recharging took place.