摘要
地表水与地下水相互转化关系和转化水量的时空变化规律是干旱地区水资源评价和合理利用的基础。河床沉积物的水力参数对于河流渗漏量评价具有很高的敏感性,使用温度观测数据约束和校正,可以提高河床沉积物水力参数和地表水与地下水转化量的可信度。以新疆玛纳斯河流域炮台镇附近头道沟渠道的排水干渠为研究对象,通过野外原位试验实时监测渠道横断面地下水温度、地下水水位、渠道地表水水位和不同埋深处河流沉积物的温度变化,分析渠道地表水与地下水相互转化关系变化前后温度的规律特征,并建立二维均质多孔介质变饱和土壤水热运移耦合数值模型,模拟分析与计算头道沟干渠渠道地表水与地下水的相互转化关系和转化量。结果表明:浅层河床沉积物的温度信号及温度梯度可有效示踪渠道地表水与地下水的相互转化关系,反演模型参数,提高数值模型的可信度;模型反演得到的土壤饱和水力传导系数为7.05 m/d;监测模拟时段内,0~28.6 d内渠道地表水补给地下水,渠道研究断面单位长度累计入渗量为35.3 m2/d,28.6~37 d内地下水向渠道排泄,渠道研究断面单位长度累计排泄量为9.626 m2/d,监测的37 d内渠道研究断面单位长度累计入渗量为25.674 m2/d;2015年7月27日22∶00至8月25日12∶30,头道沟干渠渠道地表水入渗补给地下水,地表水入渗补给量约为4.448×105 m3;2015年8月25日12∶30至9月2日22∶00,头道沟干渠排泄地下水,地下水排泄量约为1.213×105 m3。该研究结果可为研究区或类似地区水资源评价和地表水与地下水联合调度提供参考。
The temporal and spatial variation of surface water and groundwater interaction and the amount of water exchange are the basis for the evaluation and rational use of water resources in arid areas.The hydraulic parameters of riverbed sediments in the interaction zone are highly sensitive to the river seepage amount evaluation.Using temperature observation data to constrain and calibrate sediment hydraulic parameters can improve reliability of hydraulic parameters and the amount of surface water and groundwater exchange.Taking the arterial drainage of Toudaogou canal near Paotai town in Manas River basin as an example,this paper conducts an in-situ test to monitor the variation of groundwater temperature,ground-water level,surface water level and riverbed sediment temperature at different depths in real time at the cross sections of the canal,and analyzes the characteristics of the temperature before and after the exchange of the surface water and groundwater.Then the paper establishes a 2D numerical model of transport of variable-saturated soil water and heat in homogeneous porous media,and analyzes the surface water and groundwater interaction and the amount of water exchange.The results show that shallow riverbed sediments temperature at different depths can effectively trace the interaction between the surface water and groundwater,help inverse the model parameters and improve the reliability of the numerical model.The inversed saturated hydraulic conductivity of the soil is 7.05 m/d.The groundwater is recharged by canal surface water during 0~28.6 d,and the cumulative recharge per unit length of the canal is 35.3 m2/d.The groundwater discharges into the canal during 28.6~37 d,and the cumulative discharge per unit length of the canal is 9.626 m2/d.The cumulative recharge per unit length of the canal is 25.674 m2/d during the whole monitoring period of 37 d.From 22∶00 on July 27 to 12∶30 on August 25,2015,groundwater recharge from the Toudaogou canal is about 4.448×105 m3.From 12∶30 on August 25 to 22∶0
作者
卢昱含
鲜阳
靳孟贵
白宏伟
刘亚磊
刘延锋
LU Yuhan;XIAN Yang;JIN Menggui;BAI Hongwei;LIU Yalei;LIU Yanfeng(Laboratory of Basin Hydrology and Wetl and Eco-restoration,China University of Geosciences (Wuhan),Wuhan 430074,China;School of Environmental Studies,China University of Geosciences (Wuhan),Wuhan 430074,China;Wuhan Geological Survey Center of China Geological Survey,Wuhan 430205,China)
出处
《安全与环境工程》
CAS
北大核心
2020年第3期23-31,共9页
Safety and Environmental Engineering
基金
国家自然科学基金-新疆联合基金重点支持项目(U1403282)
国家自然科学基金面上项目(41672246)。
关键词
地表水与地下水相互转化
水热运移模拟
地下水资源定量评价
干旱地区
surface water and groundwater interaction
simulation of water and heat transport
quantitative evaluation of groundwater resources
arid area
