摘要
为了获取非饱和带水流过程的信息,借助流动电位正演模型,通过数值实验探讨非降雨和降雨两种条件下非饱和带流动电位和水流过程的关系,然后用南京中山植物园试验场地野外观测的流动电位和张力数据加以对比和验证。野外试验表明:流动电位可以有效地反映非饱和带水流过程。在夏季无降雨入渗的条件下,日周期变化的地表地下温度差导致水分的运动,流动电位准确地指示了非饱和带含水量和毛细压力的变化情况,从而指示出了水分运移的方向;在夏季有降雨入渗的条件下,降雨锋面推进之处,含水量和流动电位同时有明显的响应,进而根据不同位置的流动电位对降雨入渗响应的时刻差,直接求出入渗锋面的推进速度。
Based on streaming potential forward model, the relationship between streaming potential and water flow process in unsaturated zone was studied in no rainfall condition and rainfall condition. The field data obtained in the research site of Zhongshan Botanical Garden in Nanjing was applied to compare with the results of numerical experi-ments. Field experiments showed that streaming potential method was efficient to detect the water flow process in un- saturated zone. If rainfall events didn＇t happen for a long time, the daily variations of temperature difference between soil surface and subsurface might induce water movements. By monitoring streaming potential signals in the field, the variations of water content and capillary head could be indicated and the water flow direction was pointed out at the same time. When a rainfall event happened, the water content and streaming potential were responsible for the migra-tion of infiltration front immediately. According to the responses of different depth at different time, the movement ve-locity of infiltration front could be calculated directly.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2012年第5期673-679,共7页
Advances in Water Science
基金
国家自然科学基金资助项目(40771038)~~
关键词
非饱和带
电位
含水量
入渗锋面
vadose zone
electric potential
water content
infiltration front
