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临界雨量是预警山洪灾害的关键指标。山洪灾害多发生的无资料地区,其临界雨量的确定一直是防灾减灾中的难点。根据暴雨等值线图确定出的设计暴雨与设计洪水在工程实践中已广泛应用,因此,以设计暴雨与设计洪水资料为基础,率定出水文模型参数,再依据调查确定的成灾流量,计算出该防灾对象的临界雨量。选取二水源新安江与SCS两种水文模型,计算了湖北省宜昌市点军区内30个小流域的临界雨量,计算结果表明:1提出的方法对于无资料地区山洪灾害临界雨量计算具有可行性;2基于二水源新安江模型和SCS模型计算的临界雨量合理且二水源新安江模型优于SCS模型。
Critical rainfall is a key indicator of forewarning flash floods. The determination of the critical rainfall in non-material areas where flash floods occur frequently has been a difficult point in disaster prevention and mitigation. According to the storm contour map, the design storm and design flood have been widely used in engineering practice. Therefore, based on the design storm and design flood data, the hydrological model parameters are calibrated. Based on the disaster-hit flow, Calculate the critical rainfall of the disaster prevention object. Two kinds of hydrological models, namely, Xin’anjiang and SCS, were selected to calculate the critical rainfall of 30 small watersheds in the military region of Yichang, Hubei Province. The calculation results show that the proposed method is feasible for calculating the critical rainfall of mountain floods in the non-material area. 2 Based on the Xin’anjiang and SCS models of two sources of water, the critical rainfall is reasonable and the Xin’anjiang model of two sources of water is superior to the SCS model.