Using water isotopes and hydrogeochemical evidences to characterize groundwater age and recharge rat

来源 :Journal of Geographical Sciences | 被引量 : 2次 | 上传用户:tb881011
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Despite the increasing depletion of the groundwater at the Zhangjiakou aquifer system in the northwest of Beijing-Tianjin-Hebei region, little information is available on the hydrological process of groundwater in this region. In this study, we utilize
其他文献
Based on the measured discharge, sediment load, and cross-sectional data from 1986 to 2015 for the lower Yellow River, changes in the morphological parameters(width, depth, and cross-sectional geomorp
期刊
Since the reform and opening-up policy launched in 1978, the number of inbound tourists increased from 1.8 million in 1978 to 139.5 million in 2017, and that of domestic tourists increased from 344 mi
期刊
The 110th Anniversary of the Geographical Society of China (GSC)&the China Conference on Geography 2019 was held at China National Convention Center (CNCC), Beijing, China and Institute of Geographic
期刊
高分五号卫星(GF-5)是世界首颗实现对大气和陆地综合观测的全谱段高光谱卫星,其上搭载的可见短波红外高光谱相机(AHSI)是国际上首台具有自主知识产权的宽谱宽幅星载高光谱成像载荷。封面图片为GF-5 AHSI于2019-03-20获取的新疆哈密东天山各地层及岩体等高光谱数据地质特征分类图。通过高光谱数据提取的32个主类,划分为不同颜色,有效区分各地层砂岩,变质岩,中基性到酸性岩体,蚀变带等地质特征
期刊
Bibliometrics was used to statistically analyze key zones within the Yangtze River Basin(YRB) funded by the National Natural Science Foundation of China(NSFC) and national ministries over the past 20
期刊
The magnitude of mass flux is closely associated with biogeochemical watershed processes, which can generate a considerable amount of pertinent information. Moreover, both the accuracy and precision o
期刊
随着中国高速铁路与民用航空的快速发展,两者运营网络的空间竞争范围越来越大。从个人出行视角出发,同时拥有高铁与民航直达列车/航班的城市对为出行提供了选择机会,定义为高铁-民航竞争网络。以2007-2015年高铁-民航竞争网络的所有城市对为切入点,尝试刻画其演化过程与模式、网络结构与距离分布规律,并最终总结网络演化的影响因素。研究结论为:①中国高铁-民航竞争网络在空间上呈现出由东向西、由北向南的扩张趋
期刊
The excessive exposure to high concentrations of fluoride in drinking water can lead to a serious disease called fluorosis. The upstream region of the Yongding River is an ecological protection area f
期刊
在对流动人口流向变化研究的基础上,通过对中部地区的实地走访和问卷调研,兼与沿海地区对比分析,提出中部地区城镇化正在开启新路径,即回流城镇化。研究总结了回流城镇化的新特点,包括县级中心城市成为回流城镇化主要载体,城乡之间出现了摆动的"两栖"人口,地级市中心城区也是回流城镇化的重要选项。回流城镇化主要由沿海经济发达地区的产业转移、亲情社会网络、回流创业内生动力的发展等驱动。最后,论文在理论层面总结了回
期刊
以东北三省36个城市为研究区,利用400余万条兴趣点行业分类大数据,采用核密度估计、标准差椭圆、区位熵等方法分析城市空间结构及其行业构成机制。研究发现,东北城市要素显著集聚,城市内部空间结构呈现集中团块型、分散组合型、线型、放射型特征以及多元复合类型;第二产业和房地产业呈现郊区化特征,各行业发展方向与东北大区域的经济轴线一致,多数行业尚未形成专业化功能区;第二产业与房地产业的离心发展对集中团块型城
期刊