Abstract: The aim of this research is to implement the GIS visual simulation system of WaSSI-C (Water Supply Stress Index-C) model to provide model tools for regional hydro-carbon resource analysis and simulation decisions. On the basis of analyzing the theoretical framework and operation mechanism of WaSSI-C model, modular decomposition and structured design of model calculation process were carried out; software architecture was constructed by C/S mode, model diagram was designed based on spatiotemporal data model E-R, and model parameters and spatiotemporal data were managed jointly by Geodatabase spatial database and SQLite relational database. In the .Net development environment, based on the ArcGIS Engine secondary development components,hybrid programming was carried out using the C# language to realize the function of the WaSSI-C model's GIS visual simulation system. The system was applied to Yanqi Basin for verification. Results manifest that the system can automatically output the simulation map of water-carbon coupling process variables such as monthly scale evapotranspiration, runoff and total ecosystem productivity in the GIS visualization environment. The system is simple, easy to use, highly efficient and universal. The mean values of determination coefficient R² and efficiency coefficient NS of system simulation results in calibration period are 0.83 and 0.81, respectively, and 0.8 and 0.76 in verification period. The system could serve as a powerful tool support for the research of related fields, and also offer reference for the study of model visualization in ecology and hydrology.

Key words: dynamic cycling of water-carbon resources, WaSSI-C model, visualization, component GIS, space-time simulation, modularization