太行山小流域特大暴雨洪水关系及过程研究

分析发生在2000年7月3～6日,历时72 h,暴雨总量达358.19 mm特大暴雨特征的基础上,通过对小流域出口断面流量的连续监测,进一步分析了暴雨洪水关系及演变过程.结果发现:此次暴雨属于局部性、历时长、中心强度大的特大型暴雨,暴雨强度的峰值达到了32.84 mm/h,出现在降雨过程的后期;暴雨洪水在出口断面上的响应出现在降雨过程的中后期,且后期尤为明显,另外由于流域面积较小,汇流时间短,响应到来的时间也较短.同时,经过进一步分析和计算得出,此次降雨过程的最大洪峰流量为1.185 m3/s,最大洪峰流量的径流模数为3.66 m3/(s*km2), 时段最大暴雨径流系数为0.567;整个降雨历时内所产生的洪水总量为33 030.54 m3,平均径流系数为0.304.

Connection and Development Course of Catastrophic Rainstorm and Flood in Small Basin in Taihang Mountain

It rained from Jul 3rd to Jul 6th, 2000, last 72 hours. The total rainfall reached 358. 19 mm. By continuous monitoring discharge of the way out section in the small basin, analysized the rainstorm characters, based on which, further analysized the connection and development course of catastrophic rainstorm and flash flood. The results were that: the rain belonged to catastrophic rainstorm, the characters were local, long and intensive. The max rain intensity was 32. 84 mm/h, appeared in later stage of the rain. Flash flood in way out section appeared in the later-middle stage of the rain and was especially evident in later stage. In addition, the drainage area was smaller and the confluence time was shorter, so flash flood came earlier. At the same time, another two results were thatrthe max flood peak discharge during raining was 1.185 m3/s, the runoff modulus of max flood peak discharge was 3. 66 m3/(s km2), the runoff coefficient of max flash flood in calculation interval was 0. 567. The total flood volume come from the rain was 33 030. 54 m3, average runoff coefficient was 0. 304.