Influence Of Land Use Change On Hydrology Of
Shallow Water Table Environments
Author(s)
M. S. De Silva & M. H. Nachabe
Abstract
Land development through urbanization plays a significant role in changing the
hydrology of a watershed. A two-dimensional finite element variable saturation
flow model is coupled with a digital terrain analysis to quantify the impacts of
urbanization on the hydrology of shallow water table environments. The ground
surface is sealed to infiltration for a fraction of the surface corresponding to
urbanized land. A 75% increase in urbanization reduces the cumulative
transpiration by 86.4%, cumulative infiltration by 76.4% and base flow by
55.5%. Simulations to assess the influences of slope on local hydrology indicated
that landscapes with mild slopes have less base flow than landscapes with steep
slopes. Effect of surface slope on infiltration is found to be negligible due to the
presence of high porosity sandy soil at this site.
Keywords: urbanization, transpiration, infiltration, base flow.
Keywords
urbanization, transpiration, infiltration, base flow
Related Book
Other papers in this volume
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