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Based on digital technology, flood routing simulation system development is an important component of "digital
catchment". Taking QingJiang catchment as a pilot case, in-depth analysis on informatization of Qingjiang catchment
management being the basis, aiming at catchment data's multi-source, - dimension, -element, -subject, -layer and -class
feature, the study brings the design thought and method of "subject-point-source database" (SPSD) to design system
structure in order to realize the unified management of catchments data in great quantity. Using the thought of integrated
spatial information technology for reference, integrating hierarchical structure development model of digital catchment is
established. The model is general framework of the flood routing simulation system analysis, design and realization. In
order to satisfy the demands of flood routing three-dimensional simulation system, the object-oriented spatial data model
are designed. We can analyze space-time self-adapting relation between flood routing and catchments topography,
express grid data of terrain by using non-directed graph, apply breadth first search arithmetic, set up search method for
the purpose of dynamically searching stream channel on the basis of simulated three-dimensional terrain. The system
prototype is therefore realized. Simulation results have demonstrated that the proposed approach is feasible and effective
in the application.
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