摘要
在大气-地面-冻土之间存在复杂的水热变化过程,降水是青藏高原地区主要的水分补给来源,在浅层形成水热变化的不连续层.通过对北麓河地区降水和工程路面（沥青路面、砂砾路面）、天然地面（高寒草原、高寒草甸）浅层（0～80cm）温度数据的原位监测,分析在不同降水量和不同时段浅层的温度变化,结果表明北麓河地区年降水量逐年增加,增加速率为229mm·a^-1.降雨主要集中在5～9月.白天地温对降水的响应比夜间强烈.工程路面夜间的温度变化大于天然地面.在相同降水条件下,10：00～15：30时段的温度变化量大于16：00～18：00时段.随着降雨量的增加,温度下降幅度增大.砂砾、高寒草原、高寒草甸地面地温对降水的响应深度范围为0～30cm.受路面结构中隔水层的影响,沥青路面为0～20cm,且5cm深度温度的变化幅度大于地表.为进一步研究不同地面类型不同水热传输模式层结的划分提供数据基础.
There are complex hydrothermal processes in the atmosphere,the ground surface and the frozen soil.Precipitation is the main source of water supply on Qinghai-Tibetan Plateau,forms a discontinuous change layer of hydrothermal in the shallow ground. We analyze the temperature changes under the difference ground surface at different precipitation times. We use the in-situ monitoring data of precipitation and the temperature in the shallow ground from 0 to 80 cm in depth under the engineering pavement( asphalt and gravel pavement) and the natural ground( alpine steppe and alpine meadow). The results show the follows. Annual precipitation is increased every year in Beiluhe area. The increase rate is 22. 9mm·a-1. Precipitation mainly concentrates in 5 ~ 9months. Response to temperature during daytime is intense than that at night for precipitation. Temperature change under engineeringpavement is greater than that under natural ground at night. Under the same precipitation condition,temperature variations in 10: 00 ~ 15: 30 duration is greater than those in 16: 00 ~ 18: 00. As the precipitation increases,the decrease of temperature increases. The depth of temperature response to the precipitation is 0 ~ 30 cm deep range of gravel pavement,alpine steppe,and alpine meadow. The influence depth of asphalt pavement is 0 ~ 20 cm deep range. Affected by the impermeable layer of pavement,and magnitude of the temperature at 5cm depth is greater than that at the surface. This study provides data to divide the different heat transfer mode stratification under different ground surfaces.
出处
《工程地质学报》
CSCD
北大核心
2015年第5期948-953,共6页
Journal of Engineering Geology
基金
国家青年自然科学基金(41301071)
国家重点自然科学基金(41330634)
中国科学院寒旱所青年人才基金
冻土工程国家重点实验室自主研究项目(SKLFSE-ZQ-19)资助
关键词
降水
地面温度
地温
影响范围
Precipitation,Surface temperature,Ground temperature,Sphere of influence
