论文部分内容阅读
一、前言在20年前西津水电站设计时,曾遇到两个水文计算上的问题:第一个问题,西津是低水头河床式电站,厂房设计水位由下游天然水位流量关系曲线控制,但西津历年的水位流量关系曲线各年不同,在设计流量情况下,查上包线和下包线其水位相差2～3米,对工程影响较大,对安全也起控制作用,显然采用平均的 H～Q 曲线是不行的。第二个问题是推算历史最大洪水流量(调查的1881年),想用水位流量关系曲线查算,但查包线可得1881年洪峰流量为18,000～23,000米~3/秒,相差5,000米~3/秒,这对洪峰流量频率计算影响很大,从而影响到西津溢洪道孔
I. Preface Two hydrological computational problems were encountered during the design of the Xijin Hydropower Station 20 years ago. The first issue is that the Xijin Hydropower Station is a low-head riverbed hydropower plant. The designed water level of the plant is controlled by the downstream natural water flow curve. However, Over the years the relationship between the water level and flow curve in different years, under the circumstances of the design flow, check the envelope and under the envelope of the water level difference of 2 to 3 meters, a greater impact on the project, the security also play a controlling role, apparently using the average H ~ Q curve is not acceptable. The second problem is to calculate the maximum historical flood discharge (survey 1881), want to use the water level flow curve, but the investigation of the envelope in 1881 flood peak flow of 18,000 to 23,000 m 3 / s, a difference of 5,000 meters ~ 3 / s, which has a great impact on the peak flow frequency calculation, thus affecting the Xijin spillway hole