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在气候变暖影响下,多年冻土对人类活动的响应更加敏感,以至加速退化.冻土退化后带来的生态环境和工程建筑热稳定性问题也会更加明显.以黑龙江省漠河县城区为例,结合钻孔资料和温度监测数据,应用探地雷达对城区中心以及周边的多年冻土分布特征进行了探测,研究分析了城市化对多年冻土的热影响.结果表明:雷达波在漠河城区地层的传播速度为0.07~0.08 m·ns-1,探地雷达结果与钻孔、温度监测资料相一致,能够较准确的确定融化深度、冻土类型、地层结构.城区对冻土退化影响较大,城区中心冻土退化严重,探测范围(0~10 m)内无冻土存在;城郊周围沼泽化湿地下部普遍发育含冰量较高的多年冻土,人为扰动影响较小,冻土上限较浅,冻土热状况相对稳定.随着漠河城区逐渐扩张,拟建或在建市政工程大多将修建在城郊周围沼泽化湿地上,人为活动不断增加势必会加速多年冻土退化,但其长期热影响范围和程度还需深入研究.
Under the influence of climate warming, the permafrost response to human activities is even more sensitive and even degenerated, and the ecological environment and the thermal stability of engineering buildings brought by the degradation of permafrost will also be more obvious.With the urban area of Mohe County in Heilongjiang Province as In this paper, based on borehole data and temperature monitoring data, the distribution characteristics of permafrost in urban centers and surrounding areas are probed with GPR, and the thermal effects of urbanization on permafrost are studied. The results show that: The velocity of ground strata in urban area is 0.07 ~ 0.08 m · ns-1, and the result of GPR is consistent with the data of borehole and temperature monitoring, which can accurately determine the depth of melting, permafrost type and stratigraphic structure. The permafrost in the center of urban area degenerates seriously, and there is no permafrost in the detection range (0 ~ 10 m). Permafrost with high ice content is commonly developed in the lower part of swampy wetland around the outskirts. The permafrost Upper limit is shallow and the thermal condition of frozen soil is relatively stable.With the gradual expansion of Mohe urban area, most of the proposed municipal projects under construction or will be built on the swamp wetlands around the outskirts of the city, increasing human activities will inevitably accelerate Permafrost is degraded, but its extent and extent of long-term heat impact need further study.