汛期降雨对南水北调中线干线 京石段工程渠道水位影响

为了给南水北调中线工程实现全线通水后的汛期调度提供技术支撑和经验借鉴,基于2008年-2013年底南水北调中线干线京石段工程已经完成的四次向北京输水任务的相关资料,分析了通水过程中降雨对渠道水位的影响,结果表明在试运行期间汛期降雨多以小雨为主,渠道内水位普遍上涨20~30mm,当渠道内发生中到大雨时,渠道内的水位一般上涨80~100mm;结果表明4次通水过程由于没有特大暴雨,水位上涨幅度较小,对渠道安全没有影响;并基于河北省中小流域设计暴雨洪水图集,探讨了不同重现期暴雨对渠道水位的影响规律,给出了不同重新重现期条件下的控制水位。

Effects of flood season rainfall on main channel water level in Beijing2Shijiazhuang section of South2to2North Water Transfer Project

In or der t o prov ide technical suppor t and useful ex perience r efer ence fo r the flo od r eg ulation in the Middle Route of So ut h2to2Nort h Water T ransfer Pr oject af ter w ater flow ing across the ro ute, t he effects of rainfall on t he channel water level wer e analyzed based o n the water transfer data o f fo ur tasks from 2008 to 2013 in Beijing2Shijiazhuang section of South2to2 No rth Water Tr ansfer Pr oject. The results showed that rainfall in the flood season is mainly lig ht r ain and w at er level in the channel generally rises from 20 to 30 mm; water lev el in the channel can r ise from 80 to 100 mm w hen heavy rain occur s; and ther e is no heavy r ainfall during the four water t ransfer t asks so the water level r ising is small w hich has no effects on the chan2 nel saf et y o f channel. Acco rding to the design sto rm flo od atlas in t he small w atersheds o f H ebei Pro vince, the effects o f r ainfalls in differ ent r eturn r ecur rence periods on the channel water level w ere analy zed to determine t he contro l w ater lev els in differ ent return recurr ence perio ds.