Sharp decline in surface water resources for agriculture and fisheries in the Lower Mekong Basin over 2000-2020

被引:0
作者
Normandin, Cassandra [1 ]
Frappart, Frederic [1 ]
Bourrel, Luc [2 ]
Blarel, Fabien [3 ]
Biancamaria, Sylvain [3 ]
Wigneron, Jean-Pierre [1 ]
Galenon, Leonie [3 ]
Bernard, Emilie [3 ]
Coulon, Ludovic [3 ]
Lubac, Bertrand [4 ]
Marieu, Vincent [4 ,5 ]
Vantrepotte, Vincent
Pham-Duc, Binh [6 ]
Do, Huy Toan [7 ,8 ]
Prigent, Catherine [9 ]
Aires, Filipe [9 ]
Yamazaki, Dai [10 ]
Ciais, Philippe [11 ]
机构
[1] Bordeaux Sci Agro, ISPA, UMR INRAE 1391, F-33140 Villenave Dornon, France
[2] Univ Toulouse, CNRS, GET, IRD,UPS,CNES, Toulouse, France
[3] Univ Toulouse, LEGOS, CNES, CNRS,IRD,UPS,OMP, Toulouse, France
[4] Univ Bordeaux, EPOC, UMR 5805, Ave Fac, F-33405 Talence, France
[5] Univ Lille, Univ Littoral Cote Opale, CNRS, IRD,UMR 8187 LOG Lab Oceanol & Geosci, F-59000 Lille, France
[6] Vietnam Acad Sci & Technol, Univ Sci & Technol Hanoi, Dept Space & Applicat, Hanoi, Vietnam
[7] World Wide Fund Nat Viet Nam, 6 Lane 18 Nguyen Co Thach, Bac Tu Liem, Hanoi, Vietnam
[8] VNU Univ Sci, Ctr Environm Fluid Dynam, Hanoi, Vietnam
[9] PSL, LERMA, Observ Paris, CNRS, 61 Ave Observ, F-75014 Paris, France
[10] Univ Tokyo, Inst Ind Sci, Komaba, Tokyo, Japan
[11] Univ Paris Saclay, LSCE IPSL, CEA CNRS UVSQ, Gif Sur Yvette, France
关键词
Remote sensing; Hydrology; Surface water volume; Dam operation; Flood; TIME-SERIES; CLIMATE-CHANGE; WAVELET TRANSFORM; RIVER; HYDROPOWER; DELTA; DAMS; ALTIMETRY; IMPACTS; BIODIVERSITY;
D O I
10.1016/j.scitotenv.2024.175259
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Water resources play a crucial role in the global water cycle and are affected by human activities and climate change. However, the impacts of hydropower infrastructures on the surface water extent and volume cycle are not well known. We used a multi-satellite approach to quantify the surface water storage variations over the 2000-2020 period and relate these variations to climate-induced and anthropogenic factors over the whole basin. Our results highlight that dam operations have strongly modified the water regime of the Mekong River, exhibiting a 55 % decrease in the seasonal cycle amplitude of inundation extent (from 3178 km2 2 to 1414 km2) 2 ) and a 70% decrease in surface water volume (from 1109 km3 3 to 327 km3) 3 ) over 2000-2020. In the floodplains of the Lower Mekong Basin, where rice is cultivated, there has been a decline in water residence time by 30 to 50 days. The recent commissioning of big dams (2010 and 2014) has allowed us to choose 2015 as a turning point year. Results show a trend inversion in rice production, from a rise of 40 % between 2000 and 2014 to a decline of 10 % between 2015 and 2020, and a strong reduction in aquaculture growth, from +730 % between 2000 and 2014, to +53 % between 2015 and 2020. All these results show the negative impact of dams on the Mekong basin, causing a 70 % decline in surface water volumes, with major repercussions for agriculture and fisheries over the period 2000-2020. Therefore, new future projects such as the Funan Techo canal in Cambodia, scheduled to start construction at the end of 2024, will particularly affect 1300 km2 2 of floodplains in the lower Mekong basin, with a reduction in the amount of water received, and other areas will be subjected to flooding. The human, material and economic damage could be catastrophic.
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页数:16
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