长春黑顶子河流域冻土融化期氢氧同位素特征及影响因素分析
发布时间：2018-07-16 21:37
【摘要】：基于2016年冻土融化期黑顶子河流域地表水、土壤水和地下水中稳定氢(δD)氧(δ~(18)O)同位素观测数据,分析了该区域融雪产流阶段δD和δ~(18)O的时空变化特征及主要影响因素。结果表明:融化期积雪δD和δ~(18)O平均值最小,分别为-9.33%和-1.28%,且变异性最大。冻土层隔绝了地下水与融雪水的联系,因而地下水、土壤水主要来自冻结期前降雨,其δD和δ~(18)O变异性最小且均匀的分布在大气降水线附近。冻融过程控制了融雪水与土壤水的蒸发速率和混合作用,进而影响了河水δD和δ~(18)O随时间的变化特征。土地利用类型不同导致下垫面之间土壤水和地下水δD和δ~(18)O差异较大。玉米田土壤水主要来自降雨,经历了先入渗再蒸发的过程,呈现表层大深层小的变化趋势。水稻田深层土壤水和地下水主要来自作物生长期灌溉水,经历了先蒸发后入渗的过程,δD和δ~(18)O较大;表层土壤水主要来自冻结期降雨或融雪入渗,δD和δ~(18)O较小。受水稻田地下水补给、河道融冰补给以及蒸发作用的影响,主河道稳定同位素显著大于支流,这种差异的大小与流域水循环活跃程度密切相关。
[Abstract]:Based on the isotopic data of stable hydrogen (未 D) oxygen (未 ~ (18) O) in surface water, soil water and groundwater during the permafrost thawing period in 2016, the temporal and spatial variation characteristics and main influencing factors of 未 D and 未 ~ (18) O were analyzed. The results show that the average values of 未 D and 未 ~ (18) O are the lowest in the melting period, which are -9.33% and -1.28%, respectively, and the variability is the greatest. The frozen soil layer insulates the relation between groundwater and snowmelt water, so the groundwater, soil water mainly comes from rainfall before freezing period, and its 未 D and 未 ~ (18) O variability are the least and uniformly distributed near the precipitation line. The evaporation rate and mixing of snow melting water and soil water are controlled by freezing and thawing process, and the variation characteristics of 未 D and 未 ~ (18) O over time are affected. The difference of soil water and groundwater 未 D and 未 ~ (18) O between underlying surfaces resulted from different land use types. The soil water in maize field mainly came from rainfall, which experienced the process of infiltration and evaporation, and showed a trend of large, deep and small surface layer. The deep soil water and groundwater in the paddy field mainly come from the irrigation water of crop growing period, which experienced the process of evaporation and infiltration first, 未 D and 未 ~ (18) O were larger, the surface soil water mainly came from rainfall or snow melt infiltration during freezing period, 未 D and 未 ~ (18) O were smaller. The stable isotopes of the main channel are significantly larger than those of the tributaries due to the recharge of groundwater in the paddy field, the recharge of melting ice and evaporation, which is closely related to the active degree of the water cycle in the river basin.
【作者单位】： 武汉大学水资源与水电工程科学国家重点实验室;
【基金】：国家自然科学基金(51379152,91647109) 国家十二.重大科技专项(2012ZX07201-006)
【分类号】：P342;P642.14;S152
本文编号：2127738
[Abstract]:Based on the isotopic data of stable hydrogen (未 D) oxygen (未 ~ (18) O) in surface water, soil water and groundwater during the permafrost thawing period in 2016, the temporal and spatial variation characteristics and main influencing factors of 未 D and 未 ~ (18) O were analyzed. The results show that the average values of 未 D and 未 ~ (18) O are the lowest in the melting period, which are -9.33% and -1.28%, respectively, and the variability is the greatest. The frozen soil layer insulates the relation between groundwater and snowmelt water, so the groundwater, soil water mainly comes from rainfall before freezing period, and its 未 D and 未 ~ (18) O variability are the least and uniformly distributed near the precipitation line. The evaporation rate and mixing of snow melting water and soil water are controlled by freezing and thawing process, and the variation characteristics of 未 D and 未 ~ (18) O over time are affected. The difference of soil water and groundwater 未 D and 未 ~ (18) O between underlying surfaces resulted from different land use types. The soil water in maize field mainly came from rainfall, which experienced the process of infiltration and evaporation, and showed a trend of large, deep and small surface layer. The deep soil water and groundwater in the paddy field mainly come from the irrigation water of crop growing period, which experienced the process of evaporation and infiltration first, 未 D and 未 ~ (18) O were larger, the surface soil water mainly came from rainfall or snow melt infiltration during freezing period, 未 D and 未 ~ (18) O were smaller. The stable isotopes of the main channel are significantly larger than those of the tributaries due to the recharge of groundwater in the paddy field, the recharge of melting ice and evaporation, which is closely related to the active degree of the water cycle in the river basin.
【作者单位】： 武汉大学水资源与水电工程科学国家重点实验室;
【基金】：国家自然科学基金(51379152,91647109) 国家十二.重大科技专项(2012ZX07201-006)
【分类号】：P342;P642.14;S152
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