Astrid Vreugdenhil, MSc
407 East 32nd Street
Austin, Texas 78705
astridv @ birdlist.org
Born with a inquisitive and keen mind, she spent her last year in high school majoring in entry college level mathematics and physics, while in college she further deepened her passion for both subjects. As she wished to use those advanced skills for socially and environmentally relevant applications, she chose to study Physical Geography, with and emphasis in Hydrology at the Utrecht University in the Netherlands. Her advanced training in physics and mathematics allows her to thoroughly understand the working of complex models for both surface water and groundwater and develop advanced applications.
harbor deposit site: Sept 2004-present
University of Utrecht, Utrecht, the Netherlands
Modeling salt concentrations and pressure
in a clay layer of a deposit site to determine the effect of osmosis
in this layer. Contaminated sludge from the harbor of Rotterdam is stored
in a large reservoir shielded off from the aquifer with a layer of clay. There
is a concern that contaminants may seep through the clay layer and may reach
the groundwater. To simulate ion behavior several groundwater models have been
made for the deposit site for sludge from the harbor of Rotterdam. These
models simulate ion transport in the groundwater. However, no model has been
simulated by considering osmosis
and its potential effect on groundwater quality. In this light the following
tasks were performed:
groundwater model was built that incorporates the effects of osmosis on ion
transport in clay layers.
● The model was built on a Unix platform using the software package Metropol.
Groundwater model of Biebrza Basin, Poland: June
2003 to September 2004
Utrecht University, Utrecht, the Netherlands
Determining the effect of small drains in fens of the Upper Biebrza
Basin in Poland..
The Biebrza valley in Poland is one of the least disrupted wetlands in
Western and Central Europe. Current agricultural practices have resulted in
decreases of the groundwater tables, which results in compacting and
humification of the peat. In turn this results in drastic change of the
vegetation structure and species composition: both rare species and
biodiversity decline drastically. The effects of drains has concerned the
management of the National Park and a hydrological study has been requested.
To determine the effects of drains in the valley a groundwater model was made
and the following tasks were performed:
fieldwork in the Upper Biebrza Basin. Determined the thickness and
conductivity of the peat, measured discharge of rivers, and classified
raster maps, such as DEM maps, vegetation maps and hydrological maps, to
create input maps for the groundwater model.
a MODFLOW groundwater model of the Upper Biebrza valley, Poland.
model showed to which extend the water levels were lowered by drains in the
fens and decreased the flows of upwelling water. These effects of the drains
can cause change in vegetation and transformation of peat into humus.
Water budget of Lake Naivasha, Kenya: June 2000 to November 2000 ITC,
Enschede, the Netherlands.
of a model of the water levels of Lake Naivasha in Kenya. to determine the
sustainability of the lake since agricultural growth in the 1980’s. Lake Naivasha is the only fresh water lake
in the Kenyan rift valley and is essential for Kenya’s agriculture;
particularly the horticultural export production with a 5th
the world is essential for the national economy. The agricultural sector
around Lake Naivasha has been rapidly expanded during the 1980’s, and
agriculture water use appeared to drastically lower the lake’s water levels.
It was questioned whether the lake could sustain itself, therefore a model was
built to simulate the lake’s water levels. Data on the lake levels have been
collected since the 1 890s and data on river flows since the 1960s. For this
study the following activities were performed:
● Fieldwork at Lake Naivasha, Kenya. Lake water levels were collected, rivers discharges were measured, and recharge data were collected in the catchment.
existing model of lake levels was updated and improved.
were compared to actual lake level data.
results of the model showed a decrease in lake levels however, the lake could
Drs. Physical Geography, emphasis Hydrology, graduation february 2005 (MSc. Equivalent)
UNIVERSITY OF UTRECHT, Utrecht, Netherlands
B.S. Physics, 2002
UNIVERSITY OF UTAH, Salt Lake City, Utah
Principles of Groundwater Flow
Transport in the Hydrosphere
Techniques: installing observation wells, water samples, infiltration tests
Fortran, Unix, Modflow, Hydrus, ArcView, Arcinfo, Erdas Imagine, Microsoft
Dutch, English, French
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