Analysis of Changes of Terrestrial Water Storage in Shandong Province Before and After South-to-North Water Diversion Project
In order to master the influence of the East Route of South-to-North Water Diversion Project to the regional terrestrial water storage in Shandong,based on GRACE gravity satellite data from January 2010 to December 2017,combined with the data set of major hydrological factors(precipitation and evapotranspiration)in the same period,the changes of terrestrial water storage and major hydrological factors in the study area were studied by time period and region,and by the operating time of the South-to-North Water Diversion Project as the boundary.The influence of the South-to-North Water Diversion Project to the change of terrestrial water storage in Shandong Province was calculated based on the water transfer data of the South-to-North Water Diversion Project.The results show that the spatial distribution of terrestrial water storage in the study area decreases from east to west over the years.The seasonal characteristics show that the terrestrial water storage is abun-dant in summer and autumn,but less in spring and winter.The results show that the terrestrial water storage decay rate is-1.45 cm/a and-0.36 cm/a before and after the operation of the South-to-North Water Diversion Project respectively.It is found that the South-to-North Wa-ter Diversion Project has a good positive impact on the central and southern parts of western Shandong Province and the southern parts of cen-tral Shandong Province.In summary,the South-to-North Water Diversion Project has alleviated the decline trend of 56.9%of terrestrial water storage in Shandong Province,and has a positive effect on water resources conditions and terrestrial water storage enrichment in the study area during the study period.
GRACE gravity satelliteterrestrial water storagespatial-temporal variationwater diversion from south to north
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