Virtual Hydrologic Environment (VHE) - as a bridge between surface and subsurface hydrology

• Applicant: Dr. Cui Chen
• Subject Area: Hydrogeology, Hydrology, Limnology, Urban Water Management, Water Chemistry, Integrated Water Resources Management
• Term: from 2007 to 2010
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 43823488

A Virtual Hydrologic Environment (VHE) shall be developed to close the current gap between surface and subsurface hydrological modelling. A VHE is a generic representation of the physical processes that take place in the hydrological system (HS). The HS can be subdivided into surface water as well as water in soil and aquifer compartments (Fig 1) which form the subsurface system. The corresponding hydrological processes inside a HS are flow processes at the surface, like lakes, rivers and overland flow, flow processes in the soil, like unsaturated flow in soils and groundwater flow in porous and fractured media. The VHE is defined as an integrated data and model environment. Compared with the data-centred Geographic Information Systems (GIS) or physical process based numerical simulators, VHE has the ability to store geological and hydrological information in a common understandable GeoHydro/DataBase (GH/DB) structure. The GH/DB will contain the data components of the surface and subsurface in a consistent manner, which has not been achieved before as commonly both parts were only considered separately in hydrological databases and modelling. In addition, VHE can be combined with the capabilities of GIS software and remote sensing technology and facilitates the integration with numerical models, e.g. physics-based hydrological simulator GeoSys/RockFlow as it is planned for the present project. As the inherent coupled processes make the hydrologic interactions difficult to simulate, a multi-disciplinary approach is encouraged that enables a broadening of the hydrologic perspective and the advancement of hydrologic science through the integration with other related sciences and the through cross-fertilization across disciplinary boundaries. VHE as a bridge between surface and subsurface hydrology can improve our understanding of the hydrologic cycle, the interactions between water, earth, ecosystems and man and its role in the context of climate change. This is an interdisciplinary research proposal, and the following disciplines are involved: geography, hydrology, geology, scientific computing, and information technology. The proposed integration of databases and modeling from the different geo-sciences by the use of methods from scientific computing and information technology will lead to a comprehensive and consistent representation of the HS in hydrological modeling, and thus will enhance our understanding about the interactions and coupling processes between the different compartments of the HS. This research program plans to take Poyang Lake, the biggest freshwater lake in China, as an application area in an internatiopnal collaborative framework.

• DFG Programme: Research Fellowships
• International Connection: China (Hong Kong)
• Host: Professor Dr.-Ing. Olaf Kolditz