GIS-based hydrological modelling: a comparative study of HEC-HMS and the Xinanjiang model

摘要

In this research an attempt was made to critically look at the application of HEC-GeoHMS, an extension of ArcView in HEC-HMS, a HEC package which is a new generation of software being developed for rainfall-runoff simulation,. The performance of HEC-HMS was compared with that of the Xinanjiang conceptual model using historical flood data from the Wanjiabu catchment in China,, Study results indicate that flood simulation using HEC-HMS is more efficient, especially in optimizing parameters, but not quite as accurate compared with the Xinanjiang model The plausible reason for this could be due to the fact that the Xinanjiang model has more parameters, thereby making it more flexible in fitting a flood event. Finally, this study suggests that with improvement in data conditions, runoff yield can be calculated on a grid format, and the accuracy of simulation results of both models can thus be enhanced.