The potential of GRACE gravimetry to detect the heavy rainfall-induced impoundment of a small reservoir in the upper Yellow River
The potential of GRACE gravimetry to detect the heavy rainfall-induced impoundment of a small reservoir in the upper Yellow River
复制标题
GRACE重力法检测黄河上游小型水库强降雨蓄水的潜力
DOI：
10.1002/2017wr020793
复制
发表时间：
2017
影响因子：
5.4
通讯作者：
Sun Wenke
中科院分区：
文献类型：
--
作者：
Yi Shuang;Song Chunqiao;Wang Qiuyu;Wang Linsong;Heki Kosuke;Sun Wenke
人工水库是人类活动对环境影响的重要标志，其对当地蓄水量的累积影响会改变重力信号。然而，由于它们的小信号大小，这种重力变化很少使用重力恢复和气候实验（GRACE）的卫星重力测量进行研究。本文以黄河上游干流龙羊峡水库为研究对象，研究GRACE遥感技术对水库蓄水变化的探测能力。这里比较了CSR、GFZ和JPL的三种不同GRACE解决方案，它们具有三种不同的处理滤波器。我们发现，在2005年夏季的强降水导致LR水存储增加了37.9米的高度，这是相当于13.0 Gt的质量，并与DDK4滤波器的CSR解决方案显示出最好的性能，在揭示合成重力信号。我们还获得了109对水库淹没面积的测量卫星图像和水位变化的激光测高和原位观测，以获得面积高度比的LR。在LR中的GRACE系列的均方根减少了39%后，消除合成信号引起的LR中的质量变化或62%，如果GRACE系列进一步平滑。我们的结论是，GRACE数据显示有前途的潜力，在检测水存储的变化，在这10400 km2水库和小信号的大小是不是一个限制因素，使用GRACE数据检测。
Artificial reservoirs are important indicators of anthropogenic impacts on environments, and their cumulative influences on the local water storage will change the gravity signal. However, because of their small signal size, such gravity changes are seldom studied using satellite gravimetry from the Gravity Recovery and Climate Experiment (GRACE). Here we investigate the ability of GRACE to detect water storage changes in the Longyangxia Reservoir (LR), which is situated in the upper main stem of the Yellow River. Three different GRACE solutions from the CSR, GFZ, and JPL with three different processing filters are compared here. We find that heavy precipitation in the summer of 2005 caused the LR water storage to increase by 37.9 m in height, which is equivalent to 13.0 Gt in mass, and that the CSR solutions with a DDK4 filter show the best performance in revealing the synthetic gravity signals. We also obtain 109 pairs of reservoir inundation area measurements from satellite imagery and water level changes from laser altimetry and in situ observations to derive the area‐height ratios for the LR. The root mean square of GRACE series in the LR is reduced by 39% after removing synthetic signals caused by mass changes in the LR or by 62% if the GRACE series is further smoothed. We conclude that GRACE data show promising potential in detecting water storage changes in this ∼400 km2reservoir and that a small signal size is not a restricting factor for detection using GRACE data.