scholarly journals Influence of ambient groundwater flow on DNAPL migration in a fracture network: Experiments and simulations

2003 ◽  
Vol 30 (10) ◽  
pp. n/a-n/a ◽  
Author(s):  
Sung-Hoon Ji ◽  
In Wook Yeo ◽  
Kang-Kun Lee ◽  
Robert J. Glass
Keyword(s):  
Groundwater Flow ◽  
Fracture Network ◽  
Ambient Groundwater

scholarly journals Numerical estimation of fracture network permeability based on GEOFRAC model for groundwater modeling in a tin mine

2018 ◽  
Vol 10 (2) ◽  
pp. 243-248
Author(s):  
Lei Lu ◽  
Chunxue Liu ◽  
Gang Chen ◽  
Liang Guo
Keyword(s):  
Groundwater Flow ◽  
Slope Failure ◽  
Groundwater Modeling ◽  
Flow Simulation ◽  
Fracture Network ◽  
Fracture Plane ◽  
Two Dimensional ◽  
Mining Operations ◽  
Sample Data ◽  
Ore Distribution

Abstract Numerous geological research studies and mining operations have proved that fracture is one of the important factors controlling groundwater flow, mineralization, and ore distribution in metallic deposits. Most current approaches to groundwater flow simulation of naturally fractured media rely on the calculation of equivalent permeability tensors from a discrete fracture network (DFN). This study is aimed at developing a rational two-dimensional DFN by GEOFRAC, a geostatistical method of fracture direction and locations of sample data from a tin mine in the Gaosong area, Gejiu city, southwest China, and utilizing 3,724 outcrop fractures sampled on the ground of mountain Gaosong. Principal inputs of the DFN are density, direction, and continuity of disks that constitute a fracture plane. Fractures simulated by GEOFRAC were validated in that their directions corresponded well with those of the sample fractures. The permeability tensor of each modeling grid was then calculated based on the fracture network constructed. The results showed that GEOFRAC is valuable for two-dimensional DFN modeling in mines and other fracture-controlled geological phenomena, such as groundwater flow and slope failure.

scholarly journals Ambient groundwater flow diminishes nitrate processing in the hyporheic zone of streams

2017 ◽  
Vol 53 (5) ◽  
pp. 3941-3967 ◽  
Author(s):  
Morvarid Azizian ◽  
Fulvio Boano ◽  
Perran L. M. Cook ◽  
Russell L. Detwiler ◽  
Megan A. Rippy ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Hyporheic Zone ◽  
Ambient Groundwater

scholarly journals A dual fracture model to simulate large-scale flow through fractured rocks

2002 ◽  
Vol 39 (6) ◽  
pp. 1302-1312 ◽  
Author(s):  
E Z Wang ◽  
Z Q Yue ◽  
L G Tham ◽  
Y Tsui ◽  
H T Wang
Keyword(s):  
Groundwater Flow ◽  
Large Scale ◽  
Fractured Rock ◽  
Network Models ◽  
Total Porosity ◽  
Seepage Flow ◽  
Fracture Network ◽  
Fracture Model ◽  
Rock Masses ◽  
Rock Matrix

Discrete fracture network models can be used to study groundwater flow in fractured rock masses. However, one may find that it is not easy to apply such models to practical projects as it is difficult to investigate every fracture and measure its hydraulic parameters. To overcome such difficulties, a dual fracture model is proposed. Taking into account the hydraulic characteristics of the various elements of the fracture system, a hydrogeological medium is assumed to consist of two components: the dominant fracture network and the fractured rock matrix. As the dominant fracture network consists of large fractures and faults, it controls the groundwater flow in rock masses. Depending on the permeabilities of the in-fill materials, these fractures and faults may serve as channels or barriers of the flow. The fractured rock matrix, which includes rock blocks and numerous small fractures, plays a secondary role in groundwater flow in such medium. Although the small fractures and rock blocks possess low permeability, their numbers and their total porosity are relatively large. Therefore, they provide large volume for groundwater storage. In this paper, the application of the proposed model to simulate the groundwater flow for a hydropower station before and after reservoir storage is reported. The implications of the results on the design of the station are also highlighted.Key words: seepage flow, dual fracture model, dominant fracture, fractured rock matrix, case studies, rock-filled dam.

scholarly journals ATES systems in aquifers with high ambient groundwater flow velocity

Geothermics ◽  
2018 ◽  
Vol 75 ◽  
pp. 81-92 ◽  
Author(s):  
Martin Bloemendal ◽  
Theo Olsthoorn
Keyword(s):  
Groundwater Flow ◽  
Flow Velocity ◽  
Ambient Groundwater
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