丰满大坝重建期间雾凇岛冬季水温冰情监测分析

为探讨丰满水库重建期间冬季低水位运行对雾凇岛水温冰情的影响,于2013~2016年冬季(12月~次年2月)长期监测水库下泄水温和坝下70km处雾凇岛水温,同步在每年水库冰封期(2月)监测坝前垂线水温。观测结果表明,与2013年高水位相比,2014~2016年冬季低水位运行引起下泄热流量减少了50%,雾凇岛水温降低了0.9℃;库区运行水位差异对雾凇岛水温的影响程度大于气象对雾淞岛水温的影响程度;低水位运行下雾凇岛明流面积减少了38%,其末端至上游河段最远封冻距离平均增加了17.14km,封冻断面出现时间变长。研究成果可为类似工程提供参考。

Monitor and Analysis of Water Temperature and Ice Regime in Winter on Rime Island during the Reconstruction of Fengman Dam

In order to investigate the effect of low water level operation on water temperature and ice condition of Rime Island during the reconstruction period of Fengman Reservoir,a long-term monitoring of discharge temperature and the water temperature of Rime Island which is 70 km downstream of dam was carried out from December to February of2013 to 2016.The vertical water temperature of the front of the dam was monitored during the period of ice sealed in February every year.Compared with the high water level in 2013,the observation results show that the heat discharge from the lower water level in winter of 2014-2016 decreases by 50%,and the water temperature of Rime Island decreased by 0.9℃.The influence of the difference of water level on the water temperature of Rime Island was stronger than that of meteorology.The open channel area of Rime Island decreased by 38%under the low water level operation,and the furthest frozen distance from the end of Rime Island to the upstream reaches increased by 17.14 km on average.The frozen section appeared longer.The research results can provide reference for the similar projects.