Yonggen Zhang
Subsurface Hydrology Computational Group


Welcome to my research website. I am an associate professor in Tianjin University, which is the first modern university in China. Before joining Tianjin University in July 2017, I was a research specialist / postdoctoral researcher in the Department of Soil, Water, and Environmental Science at the University of Arizona since September, 2013, which ranks No.1 in the US in the field of hydrology. I was working with Prof. Marcel Schaap, Regents’ Prof. Shlomo Neuman, and Prof. Alberto Guadagnini at Politecnico Di Milano in Italy. I received my Ph.D in Hydrogeology from China University of Geosciences, Beijing in China in May, 2014; and B.S. in Hydrogeology from Jilin University, Changchun in 2007. In February 2012 to March 2014, I was a visiting student in the Department of Hydrology and Water Resources at the University of Arizona, Tucson, USA, working with Regents’ Prof. Shlomo Neuman and Prof. Marcel Schaap. The work with Shlomo and Marcel leads to my Ph.D dissertation.

We have developed new models to predict soil hydraulic parameters, inverse models to estimate groundwater/soil hydraulic parameters.In addition, I am also interested in data assimilation and Lattice Boltzmann simulation of capillary trapping Process for CO2 sequestration. Please let me know if you have any questions!

Research Highlights

Schaap et al. (2001) developed a very popular pedotransfer function, Rosetta. It is based on artificial neural network analysis coupled with bootstrap re-sampling method which allows the estimation of van Genuchten water retention parameters (van Genuchten, 1980), saturated hydraulic conductivity (Ks), and their uncertainties.

We developed a new Rosetta model that unify the water retention and Ks submodels into one. The models have less bias and better performance in terms of observed quantities. Both the Rosetta and the improved version are implemented in the python programming language, and the source code as well as additional documentation is available. Please see Download page for more information. A web-based user interface is being developed.