2006年调水调沙期间小浪底库区异重流分析

Analysis on Density Current in Xiaolangdi Reservoir Area Occurred during a Regulated Discharge Regime of the Yellow River in 2006

分析了2006年调水调沙期间小浪底库区塑造人工异重流的基本情况,指出:①该次异重流具有入库水量较小、潜入点比较靠下、演进速度快和排沙比较大等特点;②在小浪底水库塑造人工异重流至少要有5.5亿m3入库水量、2 000万t入库细泥沙量,库区坝前水位宜低于230 m,异重流期间入库流量应大于3 000 m3/s,下泄流量也宜维持在3 700m3/s左右;③排沙洞应提前开启,以利于提高异重流排沙比。同时建议:①设立小浪底库区异重流观测与研究项目组;②对异重流测验投入必要的设施设备,并积极研发能够满足水库异重流测验要求的新仪器和计算机软件。

The paper analyzes the basic situation of artificial density current formed in the Xiaolangdi Reservoir area during a regulated discharge regime in 2006 and points out that a) the density current has the characteristics of smaller inflow,lower location of dividing flow,quick velocity of routing and greater sediment delivery rate;b) it needs at least 550 million m3 inflow,20 million tons of coming fine sand,the water level in front of the dam lower than 230 m,the inflow during density current should be greater than 3 000 m3/s and the flush discharge also should be kept around 3 700 m3/s for creating an artificial density current in the Xiaolangdi Reservoir and;c) the sediment tunnel should be opened in advance for increasing the sediment delivery rate of density current.It also suggests a) establish an observation and study group of density current of the reservoir area and;b) input necessary facilities and equipment for measuring and actively developing new instruments and software that can meet the requirements for measuring reservoir density current.