岩溶地区设计洪水计算

Discussion on calculating method of design flood in Karst Area

岩溶地区设计洪水计算常用的方法有水文比拟法、雨洪法、地区综合法。对于"岩溶地区为加大天然伏流洞过流能力而进行工程措施处理,但伏流洞仍然基本保持原来不规则天然状况,难以定量分析工程处理后对下游断面设计洪水成果的加大影响程度"这一复杂工况时,建议设计洪水计算时根据设计流域特性、周边测站分布情况,采取上述三种方法对比分析,充分利用历史洪水调查成果、洪水过程拟合调算等验证方法,并从偏安全等方面合理推荐采用的设计洪水计算方法及成果。

Hydrological analogy method,rain flood method and regional synthesis method are wildly used to calculate design flood in Karst Areas.'It is difficult to quantitatively analyze the effect of engineering treatment on the design flood results of downstream sections followed the engineering measures for increasing the flow capacity of natural undercurrent caves in Karst Areas due to the original irregular natural condition of the Voltage tunnel.'Design basin characteristics and distribution of peripheral stations should be considered in calculating of design flood when it comes to the complex working conditions.By comparing and analyzing the three methods mentioned above,we could make full use of the verification methods such as historical flood investigation results and flood process fitting and adjustment.In addition,the calculation method and results of design flood were recommended reasonably from the aspects of partial safety.