Hydrologic implications of GRACE satellite data in the Colorado River Basin
Hydrologic implications of GRACE satellite data in the Colorado River Basin
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DOI：
10.1002/2015wr018090
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发表时间：
2015-12
影响因子：
5.4
通讯作者：
B. Scanlon;Zizhan Zhang;R. Reedy;D. Pool;H. Save;D. Long;Jianli Chen;D. Wolock;B. Conway;D. Winester
中科院分区：
文献类型：
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作者：
B. Scanlon;Zizhan Zhang;R. Reedy;D. Pool;H. Save;D. Long;Jianli Chen;D. Wolock;B. Conway;D. Winester
GRACE（重力恢复和气候实验）卫星在评估全球水资源方面的使用正在迅速扩大。在这里，我们通过从地面监测和建模数据重建长期总水储量（TWS）变化来推进GRACE卫星的应用。我们应用的方法，科罗拉多河流域经历了多年的强烈干旱，在十年的间隔。1986-1990年期间，TWS估计减少了94立方公里，1998-2004年期间减少了102立方公里，与GRACE记录的2010-2013年期间TWS消耗量（47立方公里）相似。我们的分析表明，TWS枯竭主要是减少地表水库和土壤水分储存在上科罗拉多盆地与额外的减少地下水储存在较低的盆地。地下水储存量的变化主要受干湿循环的自然反应以及基于地面水位和重力数据的科罗拉多河输水区以外的灌溉抽水的控制。储水量的变化主要是受干湿循环而不是用水量的增加所引起的可变水输入量的控制。地表水库蓄水缓冲区提供的可变性与目前的水库蓄水代表2.5年的可用水使用。这项研究可以作为一个模板，展示如何扩展短期GRACE TWS记录，并使用TWS存储组件的所有可用数据来解释GRACE数据，特别是在干旱的背景下。
Use of GRACE (Gravity Recovery and Climate Experiment) satellites for assessing global water resources is rapidly expanding. Here we advance application of GRACE satellites by reconstructing long‐term total water storage (TWS) changes from ground‐based monitoring and modeling data. We applied the approach to the Colorado River Basin which has experienced multiyear intense droughts at decadal intervals. Estimated TWS declined by 94 km3 during 1986–1990 and by 102 km3 during 1998–2004, similar to the TWS depletion recorded by GRACE (47 km3) during 2010–2013. Our analysis indicates that TWS depletion is dominated by reductions in surface reservoir and soil moisture storage in the upper Colorado basin with additional reductions in groundwater storage in the lower basin. Groundwater storage changes are controlled mostly by natural responses to wet and dry cycles and irrigation pumping outside of Colorado River delivery zones based on ground‐based water level and gravity data. Water storage changes are controlled primarily by variable water inputs in response to wet and dry cycles rather than increasing water use. Surface reservoir storage buffers supply variability with current reservoir storage representing ∼2.5 years of available water use. This study can be used as a template showing how to extend short‐term GRACE TWS records and using all available data on storage components of TWS to interpret GRACE data, especially within the context of droughts.