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- 清沢 秀樹
- 三重大学生物資源学部
書誌事項
- タイトル別名
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- Approximate Solutions for the Soil Water Movement during Drainage under a High Groundwater Table Condition
- チカ スイイ ガ アサイ ドソウナイ デ ショウジル ハイスイジ ノ ドジョウ
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説明
Innovative approximate solutions regarding an unsaturated water flow equation for internal drainage under a high groundwater table condition have been derived. This was obtained based on approximate separation of variables, i.e., depth z and time t. For soil whose unsaturated hydraulic conductivity was described as an exponential function of the matric potential, soil water flux f was approximated by the product of two functions, i.e., the drainage rate to groundwater (a function of t) and the distribution function (depending on z only). When groundwater level is fairly high, the distribution function is nearly equal to that derived from the linear differential equation, whereas the linear function of z is applicable for low groundwater level. Drainage rate r (t) could be determined by the “water balance equation” of the soil layer. With some limitations, numerical results obtained by the approximate solutions agreed well with the finite-difference solutions, includinig those for soil whose water characteristics are of the Brooks and Corey type. These solutions provided better understanding of various relations, for exaniple, between the drainage rate and water flux at an arbitrary depth.
収録刊行物
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- 農業土木学会論文集
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農業土木学会論文集 1996 (185), 755-765,a1, 1996
社団法人 農業農村工学会
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詳細情報 詳細情報について
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- CRID
- 1390282679520052480
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- NII論文ID
- 10016223556
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- NII書誌ID
- AN00201203
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- ISSN
- 18847234
- 03872335
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- NDL書誌ID
- 4078430
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可