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论文类型：期刊论文

发表时间：2013-01-01

发表刊物：ANNALS OF GLACIOLOGY

收录刊物：SCIE、Scopus

卷号：54

期号：62

页面范围：189-195

ISSN号：0260-3055

摘要：A study on effective thermal conductivity (ETC) of natural ice in a reservoir with <3% gas content and similar to 300 mg L-1 dissolved matter content in the parent water was conducted in a laboratory.. Ice sections were prepared to obtain the ice crystal structure, gas bubble content and ice density. Profiles of horizontal and vertical thermal conductivity of ice samples were determined with attention to relatively high temperature spanning 0 to -10 degrees C. A detailed comparative analysis was conducted of the effects on ETC of direction, ice crystal structure, gas bubbles and temperature. Gas inclusions had little impact on the thermal conductivity of natural reservoir ice due to their quite low content (<3%). At high ice temperature the ETC decreases remarkably as ice temperature approaches the melting point, as the ETC of sea ice does due to its brine volume at ice temperature approaching its melting point. The measured conductivities for temperatures higher than 4 degrees C were less than expected from previous work on saline ice. Whether this was due to the measurement techniques or actual properties of the reservoir ice is not clear. The present findings could lead to better understanding of the thermal processes of ice in natural freshwater bodies.