应用推理公式计算广西特小流域暴雨洪水可突破θ值限制的探讨

摘要

For calculating storm flood of special small watershed in Guangxi, each with catchment area less than 1km2, the Naci instantaneous unit hydrograph and reasoning formula were adopted respectively. The results of storm flood calculation for the small II-scale reservoirs located in various special small watershed of Guangxi demonstrate that the watershed parameter of θ value is much less than the minimum value specified by the Guangxi Hydrology Chart when applying reasoning formula, but the calculation results of flood peak and reservoir flood regulating are close to that out of Naci instantaneous unit hydrograph method which is not subject to limit of θ value. Therefore, calculating storm flood for special small watershed in Guangxi with reasoning formula is able to break the limit of θvalue, the watershed parameter specified by the Guangxi Hydrology Chart.%　　为了探讨广西特小流域(≤1 km2))暴雨洪水计算问题，分别应用纳希瞬时单位线法和推理公式法，对广西各特小流域的小(二)型水库的暴雨洪水计算表明：应用推理公式法计算暴雨洪水，虽然流域参数θ值远小于《广西水文图表》规定的相应最小值，但所计算得出的暴雨洪峰和水库对洪水过程调洪结果，与应用不受流域参数θ值影响的纳希瞬时单位线法得出的相应结果相当接近。因此，应用推理公式法计算广西特小流域暴雨洪水，可突破《广西水文图表》原定的流域参数θ值限制。