推理公式法在富县黄土林区洪水计算中的应用

Application of reasoning formula method in calculation of flood in Fuxian loess

黄土林区主要分布在陕西省延安市南部甘泉、富县、洛川、黄陵,铜川市的宜君和渭南市的韩城等3地(市)8个县(市)。由于历史原因,一直未能确定该区域的汇流参数,导致黄土林区无资料地区的中小流域设计洪水计算主要依赖经验公式法,理论相对严谨的推理公式法难以得到推广。通过收集黄土林区相关水文站或试验站的几场历史大洪水的降雨和汇流历时资料,确定设计流域的前期影响雨量和设计汇流历时,按照推理公式计算设计洪水,与黄土林区水文站计算成果进行对比,洪水成果与各参证站的结果比较协调,说明该计算成果比较符合黄土林区洪水的分布规律,可为黄土林区设计流域的洪水计算提供参考。

Loess forest area is mainly distributed in 8 counties （cities）, 3 areas （cities） such as Ganquan, Fuxian, Luochuan, Huangling, Yijun in Tongchuan and Hancheng in Weinan, Shaanxi Province, Due to historical reasons, the confluence parameters of the area have not been determined, which leads to the calculation of design flood in small and medium-sized watershed in the forest area without data. Through the collection of loess forest hydrological station or related test station several historical flood rainfall and runoff duration data, determine the design in the antecedent rainfall and runoff duration of design flood calculation design, according to the reasoning formula, calculation resuhs and the Loess forest hydrological station were compared, and the comparison results of flood coordination reference station results and that distribution of the calculation results compared with loess forest flood, provide reference for calculating design flood basin in Loess area.