糯扎渡水电站叠梁门试运行期实测水温与数值模拟水温对比分析

Comparative analysis between numerically simulated water temperature and measured water temperature during commissioning of stoplog gate for Nuozhadu Hydropower Station

为尽量发挥分层取水措施的生态效益和电站的经济效益,将糯扎渡水电站叠梁门试运行期实测水温与数值模拟水温进行对比,发现:(1)2015年、2016年4—8月坝前库区实测的表层水温与数值模拟的表层水温有-16%~29%的偏差;(2)糯扎渡电站坝前库区实测水温分层状况和数值模拟结果一致,属全年分层型,但试运行期间水温分两层的时段约为4个月,水温分层厚度与数值模拟的分层厚度存在差异,而且4—8月中、上层的实测水温高于数值模拟水温;(3)数值模拟预测过高地预判了电站汛期水库蓄水位,从而过高地估计了4—8月的下泄水温影响,过低地预测了分层取水措施的升温效果;(4)设计推荐的叠梁门运行调度方案总体可行,但可能偏保守。根据上述对比分析结果,建议充分利用实测水温数据,对叠梁门设计进行效果评估,进一步优化分层取水措施设计并完善叠梁门运行调度方案。

In order to fully exert the ecological benefit from stratified water intake measure and the economic benefit of hydropower station,a comparison is made between the numerically simulated water temperature and the measured water temperature during the commissioning of the stoplog gate for Nuozhadu Hydropower Station. It is found out that（ 1） there is a deviation of-16% ~29% between the measured surface water temperature and the numerically simulated one in the reservoir area in front of the dam during the period from April to August in 2015 and 2016;（ 2） the measured water temperature stratification in the reservoir area in front of Nuozhadu Hydropower Station is coincided with that of the numerically simulated one and belongs to the yearly stratified type,but the time interval of that the water temperature is stratified into two layers during the commissioning is about 4 months and there is a difference between the stratified thickness of temperature and that of the numerically simulated one,furthermore,the measured mid-upper layer temperature during the period from April to August is higher than that of the numerically simulated one;（ 3） the reservoir storage level of the hydropower is over-judged by the numerically simulated prediction,thus the impact of the discharge water temperature during the period from April to August is over-estimated,while the temperature rising effect from the stratified water intake is under-predicted;（ 4） the operation scheme for the stoplog gate recommended by design is generally feasible,but it is a little bit conservative. Based on the analysis mentioned above,it is suggested that the measured temperature data must be fully used to carry out the effect appraisal of the design of the stoplog gate,and then the design of the stratified water intake measure must be further optimized and the operation scheme of the stoplog gate must be perfected as well.