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为研究特高拱坝坝前水温一维垂向分布规律,以溪洛渡工程为例,结合分布式光纤测温结果对坝前库水温度进行反馈分析。将光纤上游拐点处温度测值视为多频组合信号,利用小波多分辨率时频分析技术,对温度监测数据进行时频分解,分离提取坝前库水温度,并建立坝前水温一维垂向分布曲线。结果表明,溪洛渡工程坝前库水温度分布基本符合稳定分层型水库分布特点,并且跃温层具有迁移、变化特性。跃温层自库表产生,经历“出生”、“生长”到“逐步成熟”的有界增长过程,最终于库底消亡。
In order to study the one-dimensional vertical distribution of the water temperature in front of the dam of UHMW-arch dam, the Xiluodu project is taken as an example to analyze the temperature of the reservoir water before it is combined with the distributed optical fiber temperature measurement results. The temperature measurement at the inflection point at the upstream of the fiber is regarded as multi-frequency combined signal. The time-frequency decomposition of temperature monitoring data is carried out by using wavelet multi-resolution time-frequency analysis technique. The temperature of the reservoir water before separation and extraction is extracted, To the distribution curve. The results show that the temperature distribution of the reservoir water before the Xiluodu project basically accords with the distribution characteristics of stable stratified reservoirs, and the transitional temperature layer has the characteristics of migration and variation. The temperature jump layer is generated from the library table and undergoes the bounded growth process of “birth”, “growth” to “gradual maturity”, and eventually dies out.