Pressure formation mechanism for unstable infiltration with finger flow development in initially dry soil

• Project/Area Number: 18580247
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Irrigation, drainage and rural engineering/Rural planning
• Research Institution: Saga University
• Principal Investigator: CHO Hiroyuki Saga University, 農学部, 准教授 (90136599)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,890,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥390,000); Fiscal Year 2008: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2007: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2006: ¥2,200,000 (Direct Cost: ¥2,200,000)
• Keywords: 土壌圏現象 / 水循環 / 農業工学 / 森林工学 / 土壌学 / 浸潤 / 逆圧力勾配 / 浸潤前線 / 浸潤の不安定性 / マイクロテンシオメータ / 負圧 / 砂丘砂 / 散水実験 / 浸潤の不安定化

Research Abstract

強度に乾燥した砂質土壌に対し, 継続的な水分供給を行うと, 浸潤前線が不安定化しやすく, 不均一な流れが生じやすくなる。このような流れは, 灌漑計画を組み立てる上で障害になるばかりでなく, 肥料や汚染物質等の溶液成分を土壌に吸着させることなく速い速度で地下水面にまで輸送し, 地下水汚染を発生させる原因の一つとなっている。本研究では, このように流れが不安定になる原因を室内実験で明らかにし, 解析的に示すことができた。

Research Products

• [Journal Article] 乾燥土壌への散水に伴う浸潤の不安定化に関する研究 (2009)
  • Author(s): 長裕幸, 井上光弘
  • Journal Title: 土壌の物理性 111号 Pages: 53-60
  • NAID: 130008084868
  • Peer Reviewed
• [Journal Article] 種々の電気伝導度条件に対する静電容量式土壌水分センサーの校正法 (2009)
  • Author(s): 宮本英輝, 長裕幸, 伊藤祐二, 筑紫二郎, 江口壽彦
  • Journal Title: 植物環境工学 (印刷中)
  • Peer Reviewed
• [Journal Article] Identification of the composite parameters of the BBH-B model specifying the effects of biohydrologic processes on the water balance of crop fields (2009)
  • Author(s): T. Kobayashi, J. Teshima, M. Mori, D. Yasutake, W. Wang, H. Cho
  • Journal Title: Biologia 64/3 Pages: 478-482
  • Peer Reviewed
• [Journal Article] Analysis of salts transport affected by root absorption capacity in surface-irrigated fields in the upper Yellow River basin (2009)
  • Author(s): D. Yasutake, T. Araki, W. Wang, T. Kobayashi, H. Cho, M. Mori, M. Kitano
  • Journal Title: Biologia 64/3 Pages: 570-574
  • Peer Reviewed
• [Journal Article] Water and salt movement in soil driven by crop roots: a controlled column study (2009)
  • Author(s): M. Kitano, K. Urayama, Y. Sakata, Y. Sonoda, K. Ebihara, Y. Sago, H. Yoshikoshi, T. Araki, D. Yasutake, H. Cho, T. Kobayashi
  • Journal Title: Biologia 64/3 Pages: 474-477
  • Peer Reviewed
• [Journal Article] 乾燥土壌への散水に伴う浸潤の不安定化に関する研究 (2009)
  • Author(s): 長 裕幸
  • Journal Title: 土壌の物理性 111(印刷中)
  • NAID: 130008084868
  • Peer Reviewed
• [Journal Article] 種々の電気伝導度条件に対する静電容量式土壌水分センサーの校正法 (2009)
  • Author(s): 宮本英輝
  • Journal Title: 植物環境工学 21(2)(印刷中)
  • Peer Reviewed
• [Journal Article] Wetting Solution and Electrical Double Layer Contributions to Bulk Electrical Conductivity of Sand-Clay Mixtures (2008)
  • Author(s): M.A. Mojid, H. Cho
  • Journal Title: Vadose Zone Journal Vol.7, No.3 Pages: 972-980
  • Peer Reviewed
• [Journal Article] Preliminary Column Experiment on Dynamics of Water and Ion Transport in Soil Affected by Root Absorption (2008)
  • Author(s): K. Urayama, K. Sakata, Y. Sonoda, K. Ebihara, T. Araki, Y. Sago, H. Yoshikoshi, D. Yasutake, H. Cho, T. Kobayashi, M. Kitano
  • Journal Title: Journal of the Faculty of Agriculture(Kyushu University) 54 Pages: 543-547
  • NAID: 120001036693
• [Journal Article] Column Experiments on the Salt Accumulation in Adjoining Different-Textured Soil Profiles with a Shallow Water Table (2008)
  • Author(s): T. Kobayashi, D. Yokoyama, K. Ebihara, K. Sakata, Y. Sonoda, K. Urayama, H. Cho, H. Yoshikoshi, M. Kitano
  • Journal Title: Journal of the Faculty of Agriculture(Kyushu University) 54 Pages: 529-534
  • NAID: 120001036691
• [Journal Article] Experiments on the Control of Salinity and Sodicity in Surface-Irrigated Fields in the Upper Yellow River Valley(IV)Tools for Analyzing Soil Salinity and Sodicity and Related Properties of the Field Soils (2008)
  • Author(s): T. Kobayashi, D. Yasutake, Y. Wu, K. Urayama, K. Tagawa, W. Wang, H. Cho
  • Journal Title: Journal of the Faculty of Agriculture(Kyushu University) 53(2) Pages: 535-541
• [Journal Article] Experiments on the Control of Salinity and Sodicity in Surface Irrigated Fields in the Upper Yellow River Valley(III)The State of Salinization and Alkalization in and around the Pingbu Experimental Field (2008)
  • Author(s): D. Yasutake, T. Araki, M. Kitano, W. Wang, K. Urayama, H. Cho, T. Kobayashi
  • Journal Title: Journal of the Faculty of Agriculture(Kyushu University) 53(1) Pages: 265-270
• [Journal Article] Experiments on the Control of Salinity and Sodicity in Surface-Irrigated Fields in the Upper Yellow River Valley(II)Observation System and Calibration (2008)
  • Author(s): H.Yoshikoshi, W. Wang, H. Cho, T. Araki, D. Yasutake, J. Zhou, K.Urayama, Y. Wu, T. Kobayashi, M. Kitano
  • Journal Title: Journal of the Faculty of Agriculture(Kyushu University) 53(1) Pages: 257-263
• [Journal Article] Experiments on the Control of Salinity and Sodicity in Surface-Irrigated Fields in the Upper Yellow River Valley(I)Objectives and Methodology (2008)
  • Author(s): W. Wang, T. Kobayashi, D. Yasutake, M. Kitano, H. Cho, T. Araki, H. Yoshikoshi
  • Journal Title: Journal of the Faculty of Agriculture(Kyushu University) 53(1) Pages: 251-256
• [Journal Article] Wetting Solution and Electrical Double Layer Contributions to Bulk Electrical Conductivity of Sand-Clay Mixtures. (2008)
  • Author(s): M. A. Mojid
  • Journal Title: Vadose Zone Journal 7(3) Pages: 972-980
  • Peer Reviewed
• [Journal Article] Experimehts on the control of salinity and sodicity in surface-irrigated Fields in the upper Yellow River valley (I (2008)
  • Author(s): Weizhen Wang
  • Journal Title: J.Fac.Agr.Kyushu Univ 53 Pages: 251-256
• [Journal Article] Experiments on the control of salinity and sodicity in surface-irrigated Fields in the upper Yellow River valley (II (2008)
  • Author(s): Hisashi Yoshikoshi
  • Journal Title: J.Fac.Agr.Kyushu Univ 53 Pages: 257-263
• [Journal Article] An improvement on the BBH model made for estimating evapotranspiration from cornfields in the upper Yellow River (2007)
  • Author(s): T. Kobayashi, J. Teshima, R. Iwanaga, D. Ikegami, D. Yasutake, W. He, H. Cho
  • Journal Title: Journal of Agricultural Meteorology 63(1) Pages: 1-10
  • Peer Reviewed
• [Journal Article] An improvement in the BBH model for estimating evapotranspiration from cornfields in the upper Yellow River (2007)
  • Author(s): Tetsuo Kobayashi
  • Journal Title: J.Agric.Meteorol 63 Pages: 1-10
  • Peer Reviewed
• [Journal Article] Response of the ECH_2O Soil Moisture Probe in Electrically COnductive Soils (2006)
  • Author(s): M.A.Mojid
  • Journal Title: Environmental Control of Biology 44(3) Pages: 225-230
• [Journal Article] Estimatinf the fully developed diffuse double layer thickness from the bulk electrical conductivity in clay (2006)
  • Author(s): M.A.Mojid
  • Journal Title: J.of Applied Clay Science 33 Pages: 278-286
• [Presentation] 散水浸潤における浸潤前線の不安定化に関する研究 (2007)
  • Author(s): 長 裕幸
  • Organizer: 農業・農村工学会
  • Place of Presentation: 松江市
  • Year and Date: 2007-08-29
• [Presentation] 散水浸潤における浸潤前線の不安定化に関する研究 (2007)
  • Author(s): 長裕幸
  • Organizer: 農業土木学会
  • Place of Presentation: 松江
• [Presentation] 乾燥地土壌における散水浸潤に伴う浸潤前線の不安定化に関する研究 (2007)
  • Author(s): 長裕幸, 井上光弘
  • Organizer: 乾燥地研究センター全国共同利用研究発表会
  • Place of Presentation: 鳥取
• [Presentation] Measuring dynamic water entry suctions with microtensiometers during non-ponding infiltration in various soil materials, Soil Science Society of America (2006)
  • Author(s): H. Cho, G.H. de Rooij, M. Inoue
  • Organizer: International Annual Meeting
  • Place of Presentation: Indianapolis, USA