国立研究開発法人土木研究所

論文・刊行物検索

利用者の方へ

詳細情報

発表 4D ERT monitoring of water infiltration in the vadose zone by means of a high-speed resistivity measurement tool

作成年度 2014 年度
論文名 4D ERT monitoring of water infiltration in the vadose zone by means of a high-speed resistivity measurement tool
論文名(和訳)
論文副題
発表会 The 28th Annual Symposium on the Application of Geophysics to Engineering and Environmental Problems (SAGEEP2015)
誌名 Proceedings of the Annual Symposium on the Application of Geophysics to Engineering and Environmental Problems (SAGEEP)
巻・号・回 28(2015)
発表年月日 2015/03/22 ~ 2015/03/26
所属研究室/機関名 著者名(英名)
Geology and Geotechnical Engineering Research Group, PWRIInazaki Tomio
MonySakanishi Kei'ichiro
CTGKImamura Sugio
抄録
Infiltration process of water into the surficial vadose zone of a levee system was monitored at short intervals by means of a newly developed high-speed resistivity measurement tool. The tool can transmit 24 individual current signals simultaneously and measure 24 potential responses. A code division multiple transmission technique is adopted for the current signal transmission. Because of its short interval time, only 30 seconds to obtain and store a total of 576 (24 x 24) dataset, we can conduct high-speed time-lapse or dense 4D resistivity measurements in the field. The tool has been used for monitoring infiltration process of surface water into the vadose zone of actual levee. We set a total of 4 current lines and 4 potential lines parallel on the slope of a levee, and infused water into the vadose zone from a small ditch dug on the levee crest. Electrode stakes were placed at 25 cm spacing along each line, and spacing between the lines was set to 50 cm. A total of 6,912 (12 pairs x 576) data were acquired at 5 min intervals in the beginning and at 30 min later. 4D tomographic analysis, applied to the dataset composed of a total of 40 stages during the infiltration across two days, successfully imaged the extent of infiltrated water in the vadose zone. Consequently, our field measurements demonstrated the usefulness of dense 4D electric resistivity tomography for the characterization of dynamic unsaturated permeability of the vadose zone of levee systems in the field.
ページの先頭へ

この画面を閉じる

Copyright (C) 2022 Independent Administrative Institution Public Works Research Institute