Department of Civil and Environmental Engineering,
Technion, Israel Institute of Technology,
Haifa, 32000, Israel
Dr. Uri Shavit received his Ph.D. at Carnegie Mellon University in 1994 and since 1995 he is at the Technion. Dr. Shavit is active in the field of environmental fluid mechanics and hydrology.
(I) Environmental fluid mechanics
As the head of the Flow Measurements Seidel Laboratory (Grand Water Research Institute), Dr. Shavit is looking for ways to apply techniques such as Particle Image Velocimetry (PIV) in water flow and environmental problems. The PIV abilities are used to study the micro-scale flow field. Improved macro-scale modeling is then achieved using the PIV results, mathematical techniques such as spatial and temporal averaging, analytical and numerical solutions, which provide new insights into a variety of environmental fluid mechanics problems.
The research projects that are currently underway in Dr. Shavit laboratory are:
The flow field at the vicinity of porous media interfaces.
The dispersion of tracers in complex environments.
The hydrodynamics of coral reefs
Flow above streambeds
Israel is a highly populated country located in a semi arid zone. The high water demand of Israel and its neighbor countries led to an over exploitation of the region water resources. One significant long term result of this over use of water is the salinization of soils and water sources. Dr. Shavit is applying modeling techniques and field measurements to better understand the sources of salinization of both ground water and surface water.
Currently he is involved in the following projects:
Salinization of the Israeli Coastal Aquifer.
Water quality along the Lower Jordan River.
Flow and transport modeling of groundwater around the Sea of Galilee.
(III) Particle Image Velocimetry (PIV)
PIV is used to generate sets of instantaneous velocity vectors in studies such as interface flow and dispersion in wetlands. It is based on powerful pulsed dual laser system and a double shutter imaging system. Seeding particles which are being added to the flowing fluid are captured by the imaging system. Cross-correlation algorithm is used to calculate the mean local displacement from which velocity is being measured. PIV provides overwhelming information which is unavailable otherwise. Recently an enhancement technique called Intensity Capping was developed and is available here. By means of a very simple image enhancement technique, PIV results are greatly improved.
Open Source Software
Intensity Capping, Enhancement Tool
(IV) Nitrogen processes in streams and sediments
Aquatic systems nitrogen is highly sensitive to anthropogenic influences. Streams such as the Lower Jordan River are heavily polluted by nitrogen species, which influence the whole ecosystem. Isotopic techniques such as Isotope Pairing Technique are applied in the field and in the laboratory to gain better understanding of the physics and biochemistry in such systems.
The Lower Jordan River