Groundwater drainage and recharge by geomorphically active gullies
Date Issued
2005
Date
2005
Author(s)
Ni, Wei-Jay
DOI
en-US
Abstract
Groundwater sapping is the geomorphic reworking of surface topography induced by water seeping out from an aquifer. In the present thesis, this process is examined using experiments, theory and computations. A laser-scanning apparatus is used to measure the evolving topography of a sand surface subject to the geomorphic action of gullies fed by groundwater. Using a linear complementarity formulation, a theory of the coupling between the subsurface and surface flow is proposed. An original aspect of the theory is that both drainage and recharge of groundwater by the surface runoff are considered. The method of fundamental solutions is used to translate the theory into a computational scheme. The computed solutions are then compared with the experimental measurements and used to guide interpretation of the laboratory observations.
Subjects
滲流侵蝕實驗
基本解法
線性互補系統
雷射地形量測
sapping experiment
linear complementarity system
method of fundamental solution
laser-scanning measurement
Type
thesis