Groundwater Storage Change in the Jinsha River Basin from GRACE, Hydrologic Models, and In Situ Data
Groundwater Storage Change in the Jinsha River Basin from GRACE, Hydrologic Models, and In Situ Data
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基于 GRACE、水文模型和现场数据的金沙江流域地下水储量变化
DOI：
10.1111/gwat.12966
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发表时间：
2019-12-23
期刊：
影响因子：
2.6
通讯作者：
Tian, Kunjun
中科院分区：
文献类型：
--
作者：
Chao, Nengfang;Chen, Gang;Tian, Kunjun
地下水在气候变化和人类活动驱动的水文过程中发挥着重要作用，特别是在上游山区盆地。金沙江流域是长江最上游地区，也是中国最大的水电产区。随着该地区人工梯级水库建设的增加，年流量和季节流量正在发生变化，并影响着水循环。本文首先结合重力恢复和气候实验任务、水文模型和现场资料，推断了考虑沉积物输运的JRB地下水蓄水量变化（GWSC）。结果表明：(1)2003 ~ 2015年，考虑输沙作用的长江三角洲GWSC趋势均值为0.76±0.10 cm/年，输沙作用贡献率为15%；(2)降水(P)、蒸散发（ET）、土壤湿度变化、GWSC和土地储水量变化（LWSC）呈现明显的季节循环；LWSC和GWSC年际变化趋势增加，P、径流量(R)、地表水储存量变化和SMC减少，ET基本保持不变；(3)长江三角洲低水密度增加的主要因素是高水密度，高水密度的增加可能主要受人类活动（如梯级筑坝）和气候变化（如气温升高导致的冰雪融化）的影响。本研究可为了解中国水环境变化模式及其对区域水资源管理的启示提供有价值的信息。
Groundwater plays a major role in the hydrological processes driven by climate change and human activities, particularly in upper mountainous basins. The Jinsha River Basin (JRB) is the uppermost region of the Yangtze River and the largest hydropower production region in China. With the construction of artificial cascade reservoirs increasing in this region, the annual and seasonal flows are changing and affecting the water cycles. Here, we first infer the groundwater storage changes (GWSC), accounting for sediment transport in JRB, by combining the Gravity Recovery and Climate Experiment mission, hydrologic models and in situ data. The results indicate: (1) the average estimation of the GWSC trend, accounting for sediment transport in JRB, is 0.76 ± 0.10 cm/year during the period 2003 to 2015, and the contribution of sediment transport accounts for 15%; (2) precipitation (P), evapotranspiration (ET), soil moisture change, GWSC, and land water storage changes (LWSC) show clear seasonal cycles; the interannual trends of LWSC and GWSC increase, but P, runoff (R), surface water storage change and SMC decrease, and ET remains basically unchanged; (3) the main contributor to the increase in LWSC in JRB is GWSC, and the increased GWSC may be dominated by human activities, such as cascade damming and climate variations (such as snow and glacier melt due to increased temperatures). This study can provide valuable information regarding JRB in China for understanding GWSC patterns and exploring their implications for regional water management.