期刊论文详细信息
JOURNAL OF HYDROLOGY 卷:535
Processes of bedrock groundwater seepage and their effects on soil water fluxes in a foot slope area
Article
Masaoka, Naoya1  Kosugi, Ken'ichirou1  Yamakawa, Yosuke2  Tsutsumi, Daizo3 
[1] Kyoto Univ, Grad Sch Agr, Dept Forest & Biomat Sci, Lab Eros Control, Kyoto 6068502, Japan
[2] Univ Tsukuba, Fac Life & Environm Sci, Div Appropriate Technol & Sci Sustainable Dev, Shizuoka 4280504, Japan
[3] Kyoto Univ, Res Ctr Fluvial & Coastal Disasters, Disaster Prevent Res Inst, Hodaka Sedimentat Observ, Gifu 5061422, Japan
关键词: Groundwater seepage;    Flux vector;    Pressure head;    Saturated area;    Soil mantle;    Hillslope hydrology;   
DOI  :  10.1016/j.jhydrol.2016.01.081
来源: Elsevier
PDF
【 摘 要 】

The impact of bedrock groundwater seepage on surface hydrological processes in a foot slope area is an important issue in hillslope hydrology. However, properties of water flux vectors around a seepage area are poorly understood because previous studies have lacked sufficient spatial resolution to capture detailed water movements. Here, we conducted hydrometric observations using unprecedented high resolution and three-dimensional tensiometer nests in the mountainous foot slope area of the Hirudani experimental basin (Japan). Our findings are summarized as follows: (1) a considerable quantity of groundwater seeped from the bedrock surface in the study site. A groundwater exfiltration flux occurred constantly from a seepage area regardless of rainfall conditions. Saturated lateral flow over the bedrock surface occurred constantly in the region downslope of the seepage area. Groundwater was likely to mixed with soil water infiltration and flowed toward the lower end of the slope. (2) During the wet season, the seepage area expanded similar to 3 m in the upslope direction along the bedrock valley in a single season. (3) The pressure head waveform observed in the seepage area showed gradual and significant increases after large rainfall events. However, the seepage pressure propagated within a relatively narrow area: a slope distance of similar to 4 m from the seepage point in the downslope direction due to the damping of seepage pressure. (4) Within the whole study area, groundwater seeped from a narrow area located at the bottom of the valley line of the bedrock surface. The shape of the seepage area changed along the valley line in the wet season. Overall, we reveal spatial and temporal variations in bedrock groundwater seepage under the soil mantle and the effects on soil water fluxes. These findings should improve the accuracy of models for predicting surface hydrogeomorphological processes in mountainous hillslopes. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free   

【 预 览 】
附件列表
Files Size Format View
10_1016_j_jhydrol_2016_01_081.pdf 5100KB PDF download
  文献评价指标  
  下载次数:5次 浏览次数:0次