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温度变化对饱和带土壤传热随机性影响的实验研究

Science Technology and Engineering(2019)

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Abstract
土壤热传递过程中存在着一定的随机现象,在众多影响因素中温度显得尤为重要.为了研究温度变化对土壤传递随机性的影响,选取土壤类型为砾砂,U型埋管为热源,在水位差为30 cm的渗流条件下采集了不同热源温度、不同土壤环境温度U型管下游沿渗流方向饱和带中6个测点24 h的逐时温度数据.采用GM(1,1)灰色模型计算确定性数据,以达到从实测温度中分离出随机温度的目的;进而对随机温度进行统计学分析,研究热源温度、土壤环境温度变化对随机温度的影响.最后采用相对灵敏度法,判断两种温度变化对随机温度的影响.结果表明,热源温度增加随机温度分布更分散,土壤环境温度增加随机温度分布更集中,随机温度对于热源温度变化更为敏感.
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