摘要
【目的】探明黄土高原淤地坝的土壤水分和浅层地下水时空分布规律。【方法】依据电阻率成像法,利用高密度电法仪在陕西省神木市六道沟小流域2座淤地坝内布置多条测线测定了土壤电阻率分布,结合实测土壤含水率与浅层地下水位,探究淤地坝浅层地下水空间分布特征并估算其储量。【结果】土壤电阻率与土壤含水率呈显著幂函数关系(P<0.05),土壤电阻率随深度增加而减小,而浅表层土壤含水率随着深度的增加而逐渐增大,存在分层现象。从沟头至沟尾,A、B坝地的浅层地下水埋深逐渐增大,浅层地下水储量呈沟尾大于沟头而中部最小的分布规律,且具有季节性变化的特征,冬末至次年夏季为土壤含水率消耗期,夏末秋初为蓄积期,夏季的储水量最小,其值分别为85 949、94 196 m^3,冬季的储水量值达到最大,其值分别为93 486、99 309 m^3。【结论】黄土高原淤地坝储存了一定的水量,并有明显的季节波动,未来应重视这部分水资源的调蓄利用。
【Background and objective】Soil water distribution in check dams is an important factor affecting agricultural production and ecological environment reconstruction in arid and semi-arid areas.The objective of this paper is to explore the spatiotemporal change in soil moisture and shallow groundwater in the check dams in the loess plateau of China.【Method】Soil moisture distribution was measured using the electrical resistivity tomography,in which several baselines were set up to measure the soil resistivity in two check dams at Liudaogou,Shenmu.Using the measured soil moisture and depth of shallow groundwater table,we analyzed the spatiotemporal change in shallow groundwater table as well as water storage in the aquifers.【Result】There was a significant power-law relationship between soil resistivity and soil moisture content with P<0.05.Soil resistivity decreased downwards along the soil depth due to the decrease in soil moisture.From the gully head to the gully tail,the depth of shallow groundwater table in both dams increased,while storage of the groundwater declined first and then started to increase after passing the middle of the gully.Soil lost water from early winter to summer,while gained water from late summer to early autumn.The groundwater storage reached its lowest point in summer with its value ranging from 85949 to 93486 m^3,and peaked in winter with its value ranging from 94196 to 99309 m^3.【Conclusion】Water exists in the check dams and the shallow groundwater in it changes seasonally.Coordinating use of this type of water resource could ameliorate temporary water shortage.
作者
袁鸿猷
樊军
金沐
马理辉
YUAN Hongyou;FAN Jun;JIN Mu;MA Lihui(College of Resources and Environment,Northwest A&F University,Yangling 712100,China;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling 712100,China;Institute of Soil and Water Conservation,Northwest A&F University,Yangling 712100,China)
出处
《灌溉排水学报》
CSCD
北大核心
2020年第10期50-56,共7页
Journal of Irrigation and Drainage
基金
国家自然科学基金项目(41977016)
陕西省科技统筹创新工程计划项目(2016KTCL02-04)。
关键词
黄土高原
淤地坝
电阻率成像法
土壤电阻率
浅层地下水
Loess plateau
check dam
electrical resistivity tomography
soil resistivity
shallow groundwater
