南水北调对北京市地面沉降影响分析

Analysis of the Influence of South to North Water Transfer on Land Subsidence in Beijing

南水北调工程开通后北京市年调入水量达数亿立方米,使北京市用水结构发生明显变化,北京平原区内地下水的开采量相对减少。文章收集数据分析2008年-2015年南水北调北京段开通前后北京市地下水水位的变化,讨论南水北调工程调水对北京市地下水位的影响,运用数学模型阐明北京市地下水水位与地面沉降问题的相关性。结果表明,2008年南水北调正式调水入京后,北京市开采地下水量减少,地下水平均水位由每年降低0.995 m减小到每年降低0.218 m,地下水水位下降速率明显变缓,地面沉降问题受良性影响得到一定缓解。

Since the opening of the south to North Water Diversion Project,the annual water supply in Beijing has reached several hundred million cubic meters.The structure of water consumption in Beijing has been changed evidently.Groundwater production was reduced after the start of the South to North Water Transfer in the Beijing plain area.The article has collected data to analyze the change of groundwater level before and after the opening of the Beijing section of the South to North Water Transfer Project in2008-2015,discussed the influence of water diversion from the South to North Water Transfer Project on groundwater level.The relevance of land subsidence and groundwater level variation has been discussed by means of mathematical model.The rate of decline of the water table has obviously decreased,from0.995meters per year to0.218meters.As a result,groundwater production has been reduced since South-to-North Water Diversion began to transfer water to Beijing.The decline rate of groundwater table is reduced.Land subsidence has been alleviated by favorable effects.