Rate and historical change of direct recharge from precipitation constrained by unsaturated zone profiles of chloride and oxygen-18 in dry river bed of North China Plain
文献类型：SCI/SSCI论文
| 作者 | Zhang L.; Zhang B.; Zhang L. |
| 发表日期 | 2012 |
| 关键词 | direct recharge chloride mass balance stable isotope profile unsaturated zone North China Plain estimating groundwater recharge irrigated cropland water-balance winter-wheat minqin basin gobi desert tritium deuterium isotopes tracers |
| 英文摘要 | Quantifying of direct recharge derived from precipitation is crucial for assessing sustainability of well-irrigated agriculture. In the North China Plain, the land use is dominated by groundwater-irrigated farmland where the direct recharge derived from precipitation and irrigation. To characterize the mean rate and historical variance of direct recharge derived from precipitation, unsaturated zone profiles of chloride and d18O in the dry river bed of the Beiyishui River were employed. The results show that archival time scale of the profile covers the duration from 1980 to 2002 (corresponding to depths from 5 to 2 m) which is indicated by matching the d18O peaks in the isotope profile with the aridity indexes gained by instrumental records of annual precipitation and annual potential evaporation. Using the chloride mass balance method, the mean rate of the direct recharge corresponding to the archival time scale is estimated to be 3.8 +/- 0.8 mm year-1, which accounts for about 0.7% of the long-term average annual precipitation. Further, the direct recharge rates vary from 2.1 to 6.8 mm year-1 since 1980. Despite the subhumid climate, the estimate of recharge rates is in line with other findings in semiarid regions. The low rate of direct recharge is considered as a result of the relative dry climate in recent decades. In dry river bed, unsaturated zone profiles of chloride and d18O combined with instrumental records could offer valuable information about the direct recharge derived from precipitation during droughts. Copyright (c) 2011 John Wiley & Sons, Ltd. |
| 出处 | Hydrological Processes |
| 卷 | 26 |
| 期 | 9 |
| 页 | 1291-1301 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1099-1085 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/30697]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Zhang L.,Zhang B.,Zhang L.. Rate and historical change of direct recharge from precipitation constrained by unsaturated zone profiles of chloride and oxygen-18 in dry river bed of North China Plain. 2012. |
入库方式： OAI收割
来源：地理科学与资源研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。