冰凌对输水渠道冰期输水能力的影响

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冰凌对输水渠道冰期输水能力的影响(论文3900字)
摘要:寒冷地区的输水工程普遍存在的河冰现象,增加了水工建筑物的荷载,影响正常的供水和发电,南水北调中线工程流经区域范围广,面临更加严峻的冰期输水问题。本文在以南水北调中线工程为研究对象,对冰水力学的主要过程进行分析,建立了输水渠道冰期输水仿真模型,对冬季干渠的输水能力进行研究,分析了工程参数、加厚冰盖糙率等对渠道输水能力的影响,研究表明:采用冰凌下输水方式时,相同糙率条件下流凌期过流能力仅略小于的冰盖输水期过流能力;冰盖糙率为0.03时,在加大水位条件下封冻期渠道过流能力为设计流量的60.39 %,该研究对保障冰期输水工程稳定、安全运行有着重要的现实意义。
关键词:冰期输水;过流能力;加厚冰盖;运行控制;
Influence of ice sheets on water conveyance capacity of water conveyance channel in ice age
Abstract: The prevalence of river ice in cold water projects has increased the load on hydraulic structures and affected normal water supply and power generation, causing huge losses to the people. The latitude of the mid-route of South-to-North Water Diversion project has a large range of latitudes and faces more severe problems of water transportation during glaciation. Therefore, it is necessary to carry out research on water transportation during the ice-age. Based on the midline project of South-to-North Water Diversion Project, the main process of ice hydraulics is analyzed, and a simulation model of water conveyance in ice channel of water conveyance channel is set up to study the water conveyance capacity of winter main canal. The results show that the overcurrent of the ice sheet under the same roughness condition is only slightly less than that of the ice sheet under the same roughness condition when the water conveyance method is adopted. The roughness of the ice sheet is 0.03 , When the water level is increased, the overcurrent capacity of the channel in the freezing period is 60.39% of the design flow rate. This research is of great practical significance to ensure the stable and safe operation of the ice water delivery project.
Key words: Glacier water transport; overcurrent capability; thickened ice sheet; operational control;