摘要
南水北调中线总干渠安阳河以北段输水明渠在冬季受寒冷气温影响,会有不同程度的冰情出现,影响输水运行控制和输水效率。为有力推动南水北调中线后续工程高质量发展,缓解冰期输水供需矛盾,基于近年来冬季冰情原型观测数据和冰期输水调度运行实践,对中线总干渠冬季冰情演化特征规律、当前冰期输水调度方式以及保障措施效果进行了系统分析。结果显示:①中线总干渠冬季冰情发生范围基本为石家庄以北段,南北渠池冻融状态不同步;主要冰情为岸冰和流冰,发生冰塞风险概率较低;冰期输水时间偏短,较大范围冰盖持续时间一般不超过1个月。②目前中线工程冬季采取的小流量、高水位浮冰盖下输水运行模式,具有安全性高、气象条件适应性好的特点,但渠道的输水能力将大幅受限。③中线工程采取的以防为主,“拦、扰、融、排、捞”一体化冰凌防控措施和各项管理措施行之有效,可供类似输水工程冰期输水运行借鉴。
The main canal of the middle route of the South-to-North Water Diversion Project,to the north of Anyang River,is affected by the cold temperature in winter,and there will be different degrees of ice conditions,which affect the operation control and water delivery efficiency.To effectively promote the high-quality development of the follow-up projects and alleviate the contradiction between water supply and demand during the freezing period,based on the prototype observation data of winter ice conditions in recent years and the operation practice of water diversion during the freezing period,the evolution characteristics of winter ice conditions in the main canal of the Middle Route,the current water transportation dispatching mode and the effect of safeguard measures were analyzed.The results showed that:①The occurrence range of winter ice conditions in the main canal was basically in the Beijing-Shijiazhuang section,and the freezing and thawing conditions in the north and south canals were not synchronized.The main ice conditions were shore ice and flowing ice,so the risk probability of an ice jam was low.At the same time,the water conveyance time during the freezing period was relatively short,and the freezing duration of a large range of ice sheets was less than one month.②The current operation mode of water conveyance under the ice cover with small flow and high water level had the characteristics of high safety and good adaptability to meteorological conditions,but the water conveyance capacity of the channel would be greatly limited.③Prevention measure was the main treatment adopted in the Middle Route currently,and the integrated measures of"blocking,disturbing,melting,draining and salvaging"and various management measures were effective,which could be used as a reference for similar water conveyance projects during the freezing period.
作者
陈晓楠
李景刚
卢明龙
靳燕国
CHEN Xiaonan;LI Jinggang;LU Minglong;JIN Yanguo(China South-to-North Water Diversion Middle Route Corporation Limited,Beijing 100038,China)
出处
《人民长江》
北大核心
2023年第12期254-259,共6页
Yangtze River
基金
水利青年科技英才资助项目。
关键词
冰期输水
控制策略
供水安全
总干渠
南水北调中线工程
water conveyance during freezing period
control strategy
water supply safety
main canal
middle route of South-to-North Water Diversion Project
