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Flood control in transboundary river basins through joint operation of key riparian reservoirs
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DOI：10.1016/j.jhydrol.2025.132911.png)
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Abstract
En 中文
Frequent and severe floods in the transboundary river pose a great threat to the lives and well-being of people in riparian countries, which urgently requires basin-wide s joint flood control operation of those reservoirs. However, coordinating a large number of reservoirs presents challenges in both solution development via complex models and practical implementation. To resolve those challenges, we identify key reservoirs for joint operation, which play essential roles in basin-wide flood control. This paper proposes a framework for joint flood control operation among the identified key reservoirs in a transboundary river basin. We introduce a novel indicator, the Flood Control Contribution (FCC) indicator to identify key reservoirs among a large number of reservoirs in the basin. Taking the Lancang-Mekong River Basin (LMRB), a transboundary basin in Southeast Asia, as a case study, the flood control effectiveness of joint optimal operation for key reservoirs is investigated. Results show that the FCC-based key reservoirs are more recommended than the volume-based ones, which identifies nine of 92 reservoirs that contributed to half of the entire basin's flood control at lower coordination costs due to the involvement of fewer reservoirs. With the threshold of 90% of the total contribution, 26 reservoirs are identified as key reservoirs and jointly operated, yielding a 22-35% attenuation in the flood peaks of frequent floods and mitigating more than 78% excess flood volume of extreme floods. Notably, in the joint action, the upstream stakeholders (Laos and China) play a dominant role (controlling nearly 90% of the flooding water) in basin-wide flood control, which can provide significant flood control effectiveness to other downstream countries. The spatially heterogeneous flood control role and effectiveness of riparian countries present in transboundary joint action. This paper offers insights into basin system management and recommends policies to enhance flood control in the transboundary river.
Keywords:
Lancang-Mekong River Basin
FCC indicator
Key reservoirs
Joint flood control operation
Riparian countries' roles
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6.3
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2.3W
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9.8W
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