以缺少径流资料的福州市北部山区流域为例，通过数字高程模型（DEM）技术与新安江三水源模型相结合的方法，探讨了资料短缺地区设计洪水的计算方法。通过参证站水文模型参数的移用，解决了流域内其他子流域的产汇流参数的估算问题。在汇流计算中，通过DEM推求等流时线，避免了在地图上勾绘等流时线的繁琐工作。随着全国各地数字高程模型的建立，将其运用到水文计算当中有重要的现实意义。

In this paper, the northern mountainous area of Fuzhou City which is an ungauged basin has been taken for example to discuss the method of design flood calculation by means of combining the DEM (digital elevation model) and the Xin'anjiang model (three components). The problem of estimating the parameters of the runoff model has been solved by using the parameters of the reference station. In the convergence calculation, the isochrones are obtained by DEM which helps to avoid the cumbersome work of drawing them on the map. With the establishment of the digital elevation model throughout the country, it is practically significant to use it in the hydrological estimation.

张 婷（1988— ） ，女，湖北石首市人，博士研究生，主要从事水文与水资源问题研究