基于GI S 及DEM 的分布式单位线分析方法为无资料小流域洪水汇流计算提供了有用工具。将分布式单位 线法用于大阁流域, 对5 场洪水的模拟结果表明, 洪峰相对误差均小于10%, 洪量误差均小于20%, 峰现时间误差 均小于0. 5 h, 确定性系数均在0. 8 以上, 得到了很好的模拟结果。

The calculatio n met ho d fo r the spatially distr ibuted unit hydro gr aph based o n GI S and dig ital elev atio n model is a use2 ful t ool to calculate the floo d confluence in the mountain w atershed. The method was applied to simulate five floods in the Dag e water shed. The simulation results showed that the relat ive er ror of flood peak is less t han 10%, the r elative er ror of floo d vol2 ume is less than 20%, the err or o f time2to2peak is less than 0. 5 h, and the effectiv e co eff icient is g reater than 0. 8, w hich indica2 ted that the met ho d is applicable fo r flood simulation.