Research Projects Pierre Y. Julien Professor of Civil Engineering |
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| Research
Summary Dr. Julien has more than 35 years of engineering experience. His academic career started with teaching at Laval University in 1979. He joined Colorado State University in 1983, he became Full Professor in 1995 and Associate Dean for International Research and Development in 2005-06. He
authored
more than 400
scientific publications
including two textbooks,
150 refereed articles including 80 full papers in scientific journals, 170 conference
presentations and 100 technical reports.
Under his
guidance, 33 Ph.D. and 58 Masters students completed graduate degrees in
Civi and Environmental
Dr. Julien delivered Keynote Addresses at numerous International Conferences including South Korea, Mexico, Malaysia, Argentina, China, Singapore, Thailand... In 2011, Dr. Julien was invited to speak at the International Conference on River Restoration for Green Growth in Seoul. He received an award from Dr. MyungPil Shim, Minister of the Office of River Restoration in South Korea.
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Overland Flow Research on overland flow has started in Canada as my part of Dr. Julien's own M.S. thesis and Ph.D. dissertation More recent research on overland flow has been funded by ARO and ARL since 1986. Some papers below refer to the overland flow characteristics from raindrop impact to sheet flows, roll waves and the applicability of simplified equations of motion.
Surface Runoff Modeling Surface runoff modeling has been the emphasis of our activities within the Center for Geosciences. This on-going project has been funded by ARO and ARL since 1986. We have developed numerical algorithms for the simulation of rainfall-runoff using GIS terrain data, raingages and/or radar rainfall precipitation. The model CASC2D has been developed at CSU through the involvement of B. Saghafian, F. Ogden, W. Doe, D. Molnar, A. Sharma and J. Jorgeson who completed PhD's. Papers
on the model CASC2D
Papers on spatial and temporal variability
Papers on
radars
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Upland
Erosion Early research papers on upland erosion date back to erosion from snowmelt in Canada. More recent research on overland flow has been funded by ARO and ARL since 1986. Some of the papers below refer to the modeling with CASC2D-SED and the transforms for the analysis of flow and sediment duration curves. The model CASC2D-SED was more recently coupled with WASP5, the significant changes in the model framework resulted in the model TREX. TREX is a Two-dimensional Runoff, Erosion and Export of contaminants from watersheds. It has been developed with M. Velleux and J. England with funding from the Center for Geosciences, the Hazardous Substance Research Center and the US Bureau of Reclamation.
 The most recent version of the model is
CASC2D-SED
which simulates soil erosion from overland flow and routes sediment by
size fractions to the outlet of a watershed. The model was developed by B. Johnson, and R. Rojas during the course of their PhD studies at CSU. This web site contains papers and
descriptions
of the models developed at CSU. The CASC2D-SED web site shows some tremendous results of the model.
Click on the blinking image to the left
The model is CASC2D-SED has been expanded to simulate the fate and transport of metals by M. Velleux and J. England for their PhD's at CSU. The new web site below contains lots of information on their dissertations and a user's guide and source code to the TREX model. 
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Alluvial Channels and Stream Restoration We have developed a method for the determination of the downstream hydraulic geometry of alluvial channels. The research has been carried out in collaboration with J. Wargadalam, C. Leon, T. Bauer and G. Richard, who received graduate degrees at CSU. This web site contains numerous papers and a spreadsheet for the calculation of the hydraulic geometry from the Julien-Wargadalam algorithm, also called the J-W equation. Several articles relate to the changes in downstream hydraulic geometry downstream of dams on the Rio Grande and below Hapcheon Dam in South Korea. The book on River Mechanics supports graduate teaching.
Resistance
to
Flow and Bedforms
Local Scour
Sedimentation Dr.
Julien's
interest in sediment transport dates back to 1977. First studies
relate to sediment transport in canadian
rivers
in collaboration with Marcel Frenette. Recent investigations
refer
to the mechanics of sediment transport. The research results
available
here refer to the studies in collaboration with H. Woo,
J.
Guo, O. Stein and many graduates who received degrees from
CSU.
This web page contains numerous papers, technical notes and reports on
published
results. The analysis of hyperconcentration, mudflows and debris
flows is available in a separate item below.
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Mudflows
and Debris Flows
Research
on
hyperconcentrations, mudflows and debris flows in mountain streams has
been on-going since 1983. Research has been carried out in
collaboration
with J. O'Brien, H. Woo, Y. Lan and J. Guo who not only manifested
great
interest in the topic, but also earned Ph.D. degrees at CSU. The
photos of the recent devastating flows in Venezuela were prepared in
collaboration
with Claudia Leon and Rosalia Rojas, both Ph.D. graduates from
CSU.
This web site contains papers and photos of the 1999 debris flows
disasters
in Venezuela. More recent
articles focus on the disasters of Typhoon Maemi and Hurricane Katrina,
as well as the increase value of waterfront urban development.
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| top Dream Team - "Rising Stars" At
the present time, several visiting professors and about 20 graduate
students currently work with Dr. Julien. Recent visiting professors include Profs: Sang-Kil
Park, Suk-Hwan Jang,
Hyun Suk Shin, Charlie Schlinger, Sang Ho Kim, Jong Seok Lee and V.P. Chao Liu. Software and Miscellaneous Einstein
Integrals: Technical
Note by Julien and Guo (2004); and Excel Spreadsheet; Fortran code of Roland et
al. ; The spreadsheet files of Srivastava
, Abad and Garcia
, and the Fortran code of Roland
are also available; The revised algorithm in the closure by
Julien and Guo
(2005) provides the algorithm for Eq. (22) in Fortran and MatLab, as well as the
example on the Missouri River in Fortran and MatLab. Software Program in FORTRAN and DATA to determine the type of bed material of a sample based on d50 and d84 - Note: the user must download both the executable and the data file. Refreshing video on the future of hydraulics in the heat of the debate on global warming.
Kristin
Bunte provided a website from which to download the guidelines for bed
material The end of a long working day for the College; J. Gessler and P. Julien, April 2006 |
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Research
on
local scour has been sustained with interest from USDA for the
analysis
of rill erosion and interest from FHWA for the analysis of pier scour
and
scour below drop structures. The investigations have been
performed
in collaboration with N. Bormann, O. Stein, and C. Santoro, who
received
degrees from CSU. This web site contains numerous papers and
descriptions
of the models developed at CSU. 
