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本文使用了GRACE重力卫星8年(2002年8月至2010年8月)的时变重力位资料,分析了华北地区陆地水量的月变化,发现在这段时间内,该地区的陆地水储量以-1.1cma-1的趋势在减少.研究结果证实,使用13点滑动平均方法与线性拟合方法得到的华北地区陆地水量相对长期变化趋势的结果一致.本文还利用CPC水文模型、全球陆地资料同化系统(GLDAS)的数据,分别估计了华北地区地表水的变化,两者得到的地表水变化与GRACE结果均符合较好,从而可以得到该地区地下水的变化趋势.在研究时段内,该地区的地表水、地下水分别以-0.6和-0.5cma-1的速率减少.华北地区降雨量减少,与地下水超采很可能是造成地下水减少的主要因素.本研究有助于更好地理解该区域气候变化,为该区域未来的水管理、减缓和防御自然灾害等提供参考.
In this paper, the time-dependent gravimetric data of the GRACE gravity satellite from August 2002 to August 2010 are used to analyze the monthly variation of land water in North China. It is found that during this period, -1.1cma-1.The results of the study confirm that the 13-point moving average method and the linear fitting method are consistent with the results of the relatively long-term trend of terrestrial water content in North China.This paper also uses the CPC hydrological model, global land data assimilation (GLDAS), respectively, the changes of surface water in North China were estimated, and the changes of both surface water and GRACE were in good agreement with each other to obtain the trend of groundwater in this area. During the study period, Surface water and groundwater decrease at rates of -0.6 and -0.5 cma-1, respectively. Reducing rainfall in North China and over-exploitation of groundwater are likely to be the major contributors to groundwater reduction. This study helps to better understand climate changes in the region Change, provide reference for future water management in the region, mitigation and defense of natural disasters.