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!
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.
Yonggen attended ISMC pre-AGU meeting and AGU Fall Meeting 2017 in New Orleans and gave an oral and poster presentation entitled "Parameter Estimation for Vadose Zone Using Pedotransfer Functions and Inverse Modeling". 12/10/2017-12/15/2017
Yonggen has already moved to Tianjin University as an associate professor. The university is a top university and also the first modern universtiy in China, which was established in 1895 as Tientsin University/Imperial Tientsin University and later Peiyang University.You may refer to Wikipedia for more details. July 2017
Yonggen gave an oral presentation in an International Workshop of Soil Physics and the Nexus of Food, Energy, and Water Systems, which was held in Shenyang, China. Yonggen also made discussions in a round table entitled “challenge for soil sciences in Global Climate models” which was organized by Dani Or, Harry Vereecken. 08/03/2017-08/06/2017