Solute Transport due to Moisture and Temperature Movement within Unsaturated Soil

非饱和土壤中水分和温度移动引起的溶质迁移

• 批准号: 06650535
• 负责人: SATO Takeshi
• 金额: $ 1.28万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650535/
• 关键词: Solute Transport; Groundwater Contamination; Heat Transport; Vapor Movement; Water Movement; Temperature; 溶解性物質; 不飽和土; 水分量; 等温水分拡散; 等圧水分拡散

Laboratory tests were carried out under applying heat to the top of the sand column. Comparisons between a nonheating and heating columns showed conspicuous difference in solute concentration of chloride ion. Large values of the concentration was obtained from the heating column, especially at the surface. Degree of saturation was not different among each column. The main reason for this difference is vapor movement and heat transfer due to the heating at the surface.The effect of precipitation was also checked using a heating and nonheating sand column. In the nonheating column, concentration decreased due to convection of vertically downward flow of pore water, on the other hand, concentration once exceeded the initial value in heating column. Exact reason was not cleared out, but this result implies the importance of weather conditions for solute transport near the ground surface.Solute transport model was developed reflecting vapor and pore water movement and heat transport. Numerical examples were demonstrated to show the efficiency of the model. The application to the laboratory tests showed a good agreement between the model and the test results. Some improvements were also indicated from these computations. Numerical method for the convection terms in heat and solute transport should be improved considering the Lagrangian scheme. Estimation of evaporation rate should be exactly made from the laboratory tests.

在砂柱顶部加热的条件下进行了室内试验。不加热柱和加热柱的比较表明，氯离子溶质浓度有明显差异。从加热柱获得了大的浓度值，特别是在表面。各色谱柱的饱和度无差异。造成这种差异的主要原因是表面加热引起的蒸气运动和传热。还使用加热和非加热砂柱检查了降水的影响。在不加热柱中，由于孔隙水垂直向下流动的对流作用，浓度降低，而在加热柱中，浓度曾一度超过初始值。具体原因尚不清楚，但这一结果暗示了气象条件对近地表溶质运移的重要性。数值算例验证了模型的有效性。室内试验结果表明，模型与试验结果吻合较好。从这些计算中也表明了一些改进。考虑到拉格朗日格式的特点，对热量和溶质运移中对流项的数值计算方法应加以改进。蒸发速率的估算应根据实验室的试验结果进行。

项目成果

松岡,浩二: "浅層地盤中での水分と熱の移動現象" 土木学会中部支部研究発表会. 381-382 (1994)

Matsuoka, Koji：“浅层地面的湿气和传热现象”日本土木工程师学会中部分会研究报告 381-382 (1994)。

棚橋,秀行: "吸着等温線のモデル化が破過曲線に及ぼす影響" 第49会土木学会年次学術講演会. 914-915 (1994)

Tanahashi, Hideyuki：“吸附等温线建模对突破曲线的影响”第 49 届日本土木工程师学会年会 914-915（1994 年）。

中村,幸生: "地表付近の地盤における水分・熱・溶質の分散現象" 第6回地盤工学シンポジウム. 83-86 (1994)

Nakamura，Yukio：“接近地表的地面中的水分、热量和溶质的分散现象”第 6 届岩土工程研讨会 83-86（1994 年）。

Tanahashi Hideyuki: "Parameter Identification of Two-Region Model Applied to Solute Transport in Sand Column Breakthrough" JSCE. Vol.499, No.III-28. 107-116 (1994)

Tanahashi Hideyuki：“应用于砂柱突破中溶质传输的两区域模型的参数识别”JSCE。

棚橋秀行: "空気吸引カラムにおける砂層中の分散現象" 土木学会論文集. 第511号. 127-134 (1995)

Hideyuki Tanahashi：“空气吸入柱中砂层的分散现象”日本土木工程学会学报第 511. 127-134 号（1995 年）。