Transient Groundwater Flow In A Single Fracture
Author(s)
M. Polák & J. Mls
Abstract
Understanding the water flow behaviour in a single fracture is essential for
investigating groundwater flow and solute transport in fractured crystalline rock
formations in the context of water supply, remediation of dissolved contaminant
or projecting long-term nuclear waste repositories. Numerical modelling was
used as a tool for studying the geometrical and hydraulic properties of a single
fracture. Two computer codes were developed for this purpose. The first one
simulates the fracture-free space geometry and the other one solves the transient
flow equation. The fracture geometry simulation consists of defining the contact
zones where the fracture is closed for the water flow, and of generating the
aperture values in zones of water flow. The distribution of contact areas within
the simulated fracture is governed by principles of percolation theory. The
positive values of aperture in water-flow zones were distributed according to the
knowledge of real fracture data. Transient flow simulation is based on principles
of fluid mass balance in the fracture space and on locally valid cubic law that
quantifies flow rate through the fracture profile. The problem is solved
numerically by means of the discretization in time and the finite element method.
The percolation theory approach makes it possible to get a faithful evaluation of
the fracture permeability and the transient form of the flow equation enables us
to simulate the flow and pressure field propagation in accordance to laboratory or
field test conditions.
Keywords: modelling, fracture geometry, transient flow, hydraulic head.
1 Introduction
Research of the groundwater flow through fractured rock has increased in the last
three decades. A lot of mathematical modelling work has been concerned with
characterization of such natural environment. Basic approaches to the water flow
Keywords
modelling, fracture geometry, transient flow, hydraulic head.
Related Book
Other papers in this volume
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