金沙江中游梯级电站区间气候及暴雨特性分析

Analysis on climate and rainstorm characteristics for cascade hydropower stations in middle reach of Jinsha River

金沙江中游梯级电站的投入运行改变了中游河道天然状态,导致洪水形成及传播规律发生变化,需要开展区间暴雨洪水变化规律的研究,掌握区间来水特性和分布规律。通过1961~2017年期间金沙江中游7个气象站的逐日降雨资料,分析了金沙江中游梯级电站区间气候及暴雨特性,总结归纳了金沙江中游致洪暴雨天气系统,区间分期降水规律(暴雨中心、暴雨类型等)。掌握金沙江中游梯级电站区间降水分布规律和来水特性,可为发挥梯级电站的综合作用、更全面地提高流域水资源利用效率提供技术支撑。

The commissioning of the cascade hydropower stations in the middle reach of the Jinsha River has changed the natural state of the reach,leading to the changes in the formation and propagation characteristics of floods.It is necessary to carry out research on the changing laws of storm and flood in the interval region,and grasp the distribution and characteristics of the interval inflow.Based on the daily precipitation data of 7 weather stations in the middle reach of the Jinsha River from 1961 to 2017,this paper analyzed the climate and rainstorm character⁃istics of the interval region,summarized the flood-causing rainstorm weather system of the interval region and the regularity of the staged precipitation of the interval(i.e.rainstorm center,rainstorm type,etc.).Grasping the precipi⁃tation distribution laws and inflow characteristics of the interval region can provide technical support for playing the comprehensive role of the cascade hydropower stations and improving all-round water resources utilization efficien⁃cy.