EGU2020-20937
https://doi.org/10.5194/egusphere-egu2020-20937
EGU General Assembly 2020
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

The water storage change anomaly and its causes in the middle-lower reaches of Yangtze River basin

Taoyong Jin, Xiaolong Li, and Zuansi Cai
Taoyong Jin et al.
  • Wuhan University, School of Geodesy and Geomatics, China (tyjin@sgg.whu.edu.cn)

The three gorges dam (TGD) is always thought to have a significant impact on hydrological and climatic change in the middle-lower reaches of the Yangtze River basin (MLYRB), which can be regarded as human driven factor. The El Nino/Southern Oscillation (ENSO) events are also considered have large effect in the MLYRB, which can be regarded as climate driven factor. In the study, using terrestrial water storage change anomalies (TWSA) from Gravity Recovery and Climate Experiment (GRACE) mission and hydrological data, we investigate the effect of TGD and ENSO on the TWSA in MLYRB and its sub-basins. From the routinely impoundment of TGD since October 2010, the TWSA and ENSO show high correlation greater than 0.75 with a 5-month time lag, except for the upper Han River basin which is large affected by the Danjiangkou reservoir, and during two extreme flood and drought events, the TWSA and ENSO are almost consistent. It is concluded that the TWSA in the MLYRB is mainly affected by the climate driven factor, but the impoundment of TGD has limited effect. Since the relationship between TWSA and ENSO is stable during the routinely impoundment of TGD, the extreme events occurred in the MLYRB can be early warned by the ENSO index. 

How to cite: Jin, T., Li, X., and Cai, Z.: The water storage change anomaly and its causes in the middle-lower reaches of Yangtze River basin, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-20937, https://doi.org/10.5194/egusphere-egu2020-20937, 2020.

This abstract will not be presented.

Display materials

Display file

Comments on the display material

AC: Author Comment | CC: Community Comment | Report abuse

Display material version 1 – uploaded on 04 May 2020
  • CC1: Comment on EGU2020-20937, Eva Boergens, 07 May 2020

    Hi Taoyong. Have you tested the forecasting quality of ENSO extremes to TWS extremes? Like you detect an extreme event in ENSO in how many cases follows an extreme event in TWS (true positiv) or you detect an extreme event in TWS that was not previously detected in ENSO (false negativ). Best, Eva

    • AC1: Reply to CC1, Taoyong Jin, 10 May 2020

      Hi, Eva. As you can see in our Page 12, there are four extreme TWS events by GRACE after the full operation of TGD, and two of them are captured by the ENSO index (the 2011 drought and the 2016 flood), but the other two are not significant in the ENSO index,  while they can be indicated by the precipitation in Page 13. Thanks for your good comments. Taoyong