冰凌對輸水渠道冰期輸水能力的影響

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冰凌對輸水渠道冰期輸水能力的影響(論文3900字)
摘要:寒冷地區的輸水工程普遍存在的河冰現象,增加了水工建筑物的荷載,影響正常的供水和發電,南水北調中線工程流經區域范圍廣,面臨更加嚴峻的冰期輸水問題。本文在以南水北調中線工程為研究對象,對冰水力學的主要過程進行分析,建立了輸水渠道冰期輸水仿真模型,對冬季干渠的輸水能力進行研究,分析了工程參數、加厚冰蓋糙率等對渠道輸水能力的影響,研究表明:采用冰凌下輸水方式時,相同糙率條件下流凌期過流能力僅略小于的冰蓋輸水期過流能力;冰蓋糙率為0.03時,在加大水位條件下封凍期渠道過流能力為設計流量的60.39 %,該研究對保障冰期輸水工程穩定、安全運行有著重要的現實意義。
關鍵詞:冰期輸水;過流能力;加厚冰蓋;運行控制;
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;

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