Development of Automated Suction Controlled Flux Sampler for Unsaturated Sandy Soil

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  • 自動サクション制御による不飽和砂質土壌中の下方浸透水採取装置の開発
  • ジドウ サクション セイギョ ニ ヨル フホウワ サシツ ドジョウ チュウ ノ カホウ シントウスイ サイシュ ソウチ ノ カイハツ

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Abstract

A sandy field has the potential hazard of nitrate contamination because of its low fertilizer holding capacity. A suction controlled flux sampler (SCFS) consisting of an automated vacuum system and a sampling filter device has been developed for accurate measurement of water flux from the root zone. Knowing that water content in sandy field was highly sensitive to suction change, a buffer container was placed between the pump and a sampling bottle to apply moderate suction and avoid accidental over-sucking. A sampling device with a glass filter was placed in a dune sand column and infiltration experiments were conducted. A moderate suction was achieved and the resulting water-collecting efficiency was from 94 to 109 % under continuous rainfall. It showed that SCFS collected infiltrated water effectively without disturbing the infiltration streamline.

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