The Impact of Precipitation Deficit and Urbanization on Variations in Water Storage in the Beijing-Tianjin-Hebei Urban Agglomeration

The Impact of Precipitation Deficit and Urbanization on Variations in Water Storage in the Beijing-Tianjin-Hebei Urban Agglomeration

Blog Article

Depletion of water resources has threatened water security in the Beijing-Tianjin-Hebei urban agglomeration, China.However, the relative importance of precipitation and urbanization to water storage change has not been sufficiently studied.In this Ice Transport Buckets/Totes study, both terrestrial water storage (TWS) and groundwater storage (GWS) change in Jing-Jin-Ji from 1979 to the 2010s were investigated, based on the global land data assimilation system (GLDAS) and the EartH2Observe (E2O) outputs, and we used a night light index as an index of urbanization.The results showed that TWS anomaly varied in three stages: significant increase from 1981 to 1996, rapid decrease from 1996 to 2002 and increase from 2002 to the Knob Transfers 2010s.

Simultaneously, GWS has decreased with about 41.5 cm (500% of GWS in 1979).Both urbanization and precipitation change influenced urban water resource variability.Urbanization was a relatively important factor to the depletion of TWS (explains 83%) and GWS (explains 94%) since the 1980s and the precipitation deficit explains 72% and 64% of TWS and GWS variabilities.

It indicates that urbanization coupled with precipitation deficit has been a more important factor that impacted depletion of both TWS and GWS than climate change only, in the Jing-Jin-Ji region.Moreover, we suggested that the cumulative effect should be considered when discussing the relationship between influence factors and water storage change.