Hydrology and Earth System Sciences
Hydrology and Earth System Sciences
HESS
Articles | Volume 30, issue 21
Articles | Volume 30, issue 21
https://doi.org/10.5194/hess-30-6821-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-30-6821-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 30, issue 21
Research article
 | 
05 Nov 2026
Research article |  | 05 Nov 2026

Dam-regulated flow fragmentation and sand-mining-driven threshold shifts shorten the Mekong–Tonle Sap reverse-flow season

Khosro Morovati, Hongling Zhao, and Fuqiang Tian

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Short summary

Each wet season, the Mekong River flows into Cambodia's Tonle Sap Lake, supporting fisheries and farming. We used river records and simulations to study changes linked to dams, climate variability and sand mining. Altered river flows and a lowered riverbed now require stronger flows to bring water into the lake. Together, these changes have shortened the inflow season by about 28 days compared with earlier decades. Protecting the lake depends on when water arrives, not just how much.

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