[关键词]
[摘要]
地下水资源对京津冀地区生产发展至关重要,厘清地下水储量变化的时空演变规律对于该区域的水安全保障和可持续发展具有重要意义。本文首先基于2003-2019年GRACE陆地水储量变化数据和全球陆地水文模型(GLDAS)数据反演了京津冀地下水储量变化,进而运用时空分析方法对地下水等效水高变化进行了时空演变特征分析。结果表明:空间变化上,整个京津冀地下水等效水高变化速率约为-51.77mm/a,其中北京变化速率最低,约为-38.15mm/a;天津市变化速率最高,约为-62.85mm/a;河北省变化速率与区域平均变化水平相当,约为-52.42mm/a。基于Sen+M-K法分析得出西部、西南部和中部地区地下水等效水高下降趋势最明显,东北部下降趋势最小。时间变化上,地下水等效水高变化具有一定的季节性规律,夏季变化速率最大,约为-75.99mm/a;冬季变化速率最小,约为-37.24mm/a;春秋两季的变化速率大致相同,分别为-52.34mm/a和-48.21mm/a。影响因素分析中,人类活动是引起京津冀地区地下水等效水高变化的主要因素。本文的研究能为科学掌握京津冀地下水储量时空变化规律提供数据支撑。
[Key word]
[Abstract]
Groundwater storage is significant for the development of the Beijing-Tianjin-Hebei region, where is an important political, economic and cultural center in China. In study, we use GRACE-based terrestrial water storage anomalies and global land hydrological model (GLDAS) data to retrieve the groundwater storage change in the Beijing-Tianjin-Hebei region. Furthermore, spatiotemporal evolution pattern of the ground water storage is analyzed based on the retrieved equivalent water height. The result shows that the change rate of groundwater storage of Beijing-Tianjin-Hebei is about -51.77mm yr-1 in equivalent water height with lowest value of about -38.15mm yr-1 in Beijing city and highest value of about -62.85mm yr-1 in Tianjin city. The rate of change in Hebei Province is about -52.42mm yr-1, which is equivalent to that of regional average change. Based on the Sen Slope and Mann-Kendall methods, we find that the decline of equivalent water height of groundwater is notable in the western, southwestern and central region, and slight in the northeast. Furthermore, temporal analysis shows that the change of groundwater storage is seasonal. The change rates of equivalent water height of groundwater are largest with value of about -75.99mm yr-1 in summer, lowest with value of about -37.24mm yr-1 in winter. And it is roughly the same in spring and autumn with value of about -52.34mm yr-1 and -48.21mm yr-1, respectively. In addition, we also find the influence of anthropogenic factor on the change of groundwater storage is greater than that of natural factor. Our research can provide data for understanding the spatiotemporal variation of groundwater storage in Beijing-Tianjin-Hebei Region.
[中图分类号]
[基金项目]
中国科学院A类战略性先导科技专项课题(XDA19040402);国家重点研发计划项目(2016YFC0401404);“高分共性产品真实性检验关键技术研究与标准规范编制”(21-Y20B01-9001-19/22)