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\begin{document}

\title{Missing water from the Qiantang Basin on the Tibetan Plateau}



\author[1]{Bin Yong}%
\author[2]{Chi-yuen Wang}%
\author[1]{Jiansheng Chen}%
\author[1]{Jiaqi Chen}%
\author[1]{Tao Wang}%
\author[3]{Ling Li}%
\author[4]{D. Andrew Barry}%
\affil[1]{Hohai University}%
\affil[2]{University of California, Berkeley}%
\affil[3]{Westlake University}%
\affil[4]{École Polytechnique Fédérale de Lausanne}%


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  \date{May 21, 2024}


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\begin{abstract}
The Qiangtang Basin is a large endorheic basin as the inner part of the
Tibetan Plateau and has been thought to be a dry region in contrast with
its wet surrounding outer region that feeds all the major Asian rivers.
Combing surface hydrological data with modelling and satellite data
between 2002 and 2017, our study reveals that an enormous amount of
water of 54.52\selectlanguage{ngerman}±15.36 km is unaccounted for annually in the Qiangtang
Basin. The amount of this missing water is comparable to the total
annual discharge of the Yellow River. Data from the Gravity Recovery and
Climate Experiment (GRACE) show no increase of the local terrestrial
water storage. Thus the missing water must have flowed out of the basin
through underground passages. Interpreting this result with recent
seismic and geological studies of Tibet, we suggest that a significant
amount of meteoric water in the Qiangtang Basin have leaked out by way
of groundwater flow through deep normal faults and tensional fractures
along the nearly N-S rift valleys that are oriented sub-normal to and
cross the surficial hydrological divide on the southern margin of the
basin. Cross-basin groundwater outflow of such a magnitude defies the
traditional view of basin-scale water cycle and leads to a very
different picture from the previous hydrological view of the Qiangtang
Basin. The finding calls for major rethinking of the water balance in
Tibet and the nearby regions.%
\end{abstract}\selectlanguage{ngerman}%



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