Observational study on rainwater infiltration into a mountain

山区雨水入渗观测研究

• 批准号: 06650574
• 负责人: SHIMOJIMA Eiichi
• 金额: $ 1.22万
• 依托单位: Daido Institute of Technology
• 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-06650574/
• 关键词: rain-infiltration; fractured sedimentary rocks; mountain tunnel; seepage; water quality; CO_2 gas; observation; 山体トンネル湧水

Through continuous monitoring of seepage into a tunnel in a mountain composed of sedimentary fractured rocks and CO_2 gas concentraiton (C_<co2>) within the tunnel, the following is disclosed : (1) Increase in the discharge of seepage water (Q) owing to rainfall was observed to be faster than that in C_<co2>, when Q was large. Comparing a theoretical analysis with the observed result, it was concluded that, when C_<co2> shows a peak value, a slowly infiltrating component (matrix flow) begins to contribute to the seepage discharge. Pore-airs with high concentration of CO_2 gas near the ground surface are transported downwards by movement of the matrix flow. These ascertain the existence of two infiltration components called 'fissure flow' and 'matrix flow' which occur in relatively large and small voids of fractured rocks base, respectively. Overall, information of CO_2 gas concentraiton is useful for understanding the infiltration process. (2) A detected quite good correspondence of variation in the electrical conductivity of seepage water to that in C_<co2> is based on the chemical process that, the concentraiton of HCO_3^- (dominant anion) changes with varying C_<co2> in void-airs via dissolution/degassing.

通过连续监测由沉积性裂缝岩石组成的山脉中的渗漏和隧道内的CO_2气体浓缩岩（C_ <co2>）组成的山脉，以下披露：（1）由于降雨的排放量增加了渗水（q）的增加，因为降雨比C_ <co2>在Q中更快。将理论分析与观察到的结果进行比较，得出的结论是，当C_ <co2>显示峰值时，缓慢渗透成分（矩阵流）开始有助于渗流。通过基质流动的运动，在地面附近具有高浓度的CO_2气体的孔径向下运输。这些确定了两个称为“裂缝流”和“基质流”的两个浸润成分的存在，这些成分分别以相对较大和小的裂纹岩石碱基的空隙发生。总体而言，CO_2气体浓度的信息对于理解渗透过程很有用。 （2）检测到的相当良好的渗流水电导率变化对应关系是基于化学过程，即HCO_3^ - （主要阴离子）的浓缩物的浓缩过程随着void-airs的变化c_ <co2>而变化。

项目成果

Y.Ueda, E.Shimojima, R.Yoshioka, T.Tanaka & Y.Hoso: "Rain-infiltration into a mountain and behaviors of CO_2 gas" Proc.Ann.Conference, JSCE. (in press). (1996)

Y.Ueda、E.Shimojima、R.Yoshioka、T.Tanaka

下島栄一: "亀裂堆積岩の山体での雨水浸透とその水質" 水工学論文集(土木学会). 1995 (39)

Eiichi Shimojima：“裂隙沉积岩山体中的雨水渗透及其水质”水利工程学报（日本土木工程师学会）1995（39）。

下島栄一・吉岡龍馬: "山体トンネルの湧水と炭酸ガス濃度の変化の関係" 土木学会中部支部研究講演会概要集. 209-210 (1996)

Eiichi Shimojima和Ryoma Yoshioka：“山隧道中的泉水与二氧化碳浓度变化之间的关系”日本土木工程师学会中部分会研究会议摘要209-210（1996）。

E.Shimojima, Y.Ueda, T.Tanaka & Y.Hoso: "Rain-infiltration into a fractured sedimentary rock mountain and its water quality." Ann.J.Hydraulic Eng., JSCE. 39. 325-330 (1995)

E.下岛、Y.Ueda、T.Tanaka

上田裕一朗・下島栄一・吉岡龍馬: "山体トンネルの湧水の変化と炭酸ガス濃度の変化の関係" 土木学会中部支部研究発表会講演概要集. 209-210 (1996)

Yuichiro Ueda、Eiichi Shimojima、Ryoma Yoshioka：“山间隧道中泉水变化与二氧化碳浓度变化之间的关系”日本土木工程师学会中部分会的演讲摘要 209-210 (1996)。