Some Scale Issues in Hydrological Modes

The scale problem is an important factor restricting the development and application of hydrological models. This paper reviewed the research progress on the scale of hydrological models,put forward several issues in the study of hydrological model scale,including the scale relationship between the hydrological model and the hydrological process,spatial and temporal heterogeneity problem,the scale of hydrological modeling and coupling,remote sensing and GIS in relation to the hydrological models. Therefore,the paper tried to discuss the establishment and development of the global water cycle observation network,strengthen the mechanism of the hydrological process research,mining law of watershed hydrological processes,based on mathematical method and physics from the angle of theory to build the multi- scale hydrological models and based on remote sensing and GIS technology research on different scales of hydrological models and other methods to solve the key problems of hydrological model scale,and then use different scale models to predict the global water cycle change trend,to better cope with basin,regional and even global climate change.