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首页> 外文期刊>Climatic Change >Sediment related impacts of climate change and reservoir development in the Lower Mekong River Basin: a case study of the Nam Ou Basin, Lao PDR
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Sediment related impacts of climate change and reservoir development in the Lower Mekong River Basin: a case study of the Nam Ou Basin, Lao PDR

机译：湄公河流域气候变化与水库发展的沉积物 - 南部欧盆地案例研究

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This study applies the soil and water assessment tool (SWAT), with climate (precipitation and temperature) outputs from four general circulation models (GCMs) and a regional circulation model (PRECIS), to evaluate (1) the impacts of climate change on reservoir sedimentation and (2) the impacts of climate change and reservoir development on sediment outflow in the Nam Ou River Basin located in northern Laos. Three reservoir-density scenarios, namely one reservoir (1R), three reservoirs in series (3R), and five reservoirs in series (5R), were evaluated for both no climate change and climate change conditions. The results show that under no climate change conditions, by 2070, around 17, 14, and 15% of the existing reservoir storage volume in the basin will be lost for 1R, 3R, and 5R scenarios, respectively. Notably, under climate change scenario with highest changes in erosion and sediment outflux from the basin, the additional reduction in reservoir storage capacity due to sedimentation is estimated to be nearly 26% for 1R, 21% for 3R, and 23% for 5R. Climate change alone is projected to change annual sediment outflux from the basin by -20 to 151%. In contrast, the development of reservoirs in the basin will reduce the annual sediment outflux from the basin varying from 44 to 80% for 1R, 44-81% for 3R, and 66-89% for 5R, considering climate change. In conclusion, climate change is expected to increase the sediment yield of the Nam Ou Basin, resulting in faster reduction of the reservoir's storage capacity. Sediment yield from the Nam Ou River Basin is likely to decrease significantly due to the trapping of sediment by planned reservoirs. The impact of reservoirs is much more significant than the impact of climate change on the sediment outflow of the basin. Hence, it is necessary to investigate appropriate reservoir sediment management strategies.
机译：本研究适用于水域和水评估工具（SWAT），气候（降水和温度）从四种一般循环模型（GCM）和区域循环模型（PRECIS）的产出，评估（1）气候变化对水库的影响沉积和（2）气候变化及水库发展对位于老挝北部南欧河流域泥沙流出的影响。三个储层密度方案，即一个水库（1R），串联（3R）的三个储存器，以及串联（5R）的五个水库，既不是无气候变化和气候变化条件。结果表明，在无气候变化条件下，在2070年，大约17,14和15％的盆地中的现有储层储存量的15％分别将损失1R，3R和5R场景。值得注意的是，在气候变化的情况下，从盆地的侵蚀和沉积物的最高变化的情况下，估计由于沉降引起的储层容量的额外降低估计为1R，21％，3r的21％和23％。仅预计气候变化将从盆地换每年沉积物-20至151％。相比之下，盆地储层的发展将减少从44％到80％的盆地的年度沉积物，考虑到气候变化，每年44-81％的3R，66-89％。总之，预计气候变化将增加NAM OU盆地的沉积物产量，从而更快地减少了水库的储存能力。由于计划水库诱饵沉积物，来自南欧河流域的沉积物产量可能会显着降低。水库的影响比气候变化对盆地沉积物流出的影响要重大。因此，有必要调查适当的水库沉积物管理策略。

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  • 来源
    《Climatic Change》 |2018年第1期|共15页
  • 作者

    Shrestha Bikesh; Maskey Shreedhar; Babel Mukand S.; van Griensven Ann; Uhlenbrook Stefan;

  • 作者单位

    Univ Canterbury Civil &

    Nat Resources Engn Private Bag 4800 Christchurch New Zealand;

    UNESCO IHE Inst forWater Educ Dept Water Sci &

    Engn POB 3015 NL-261DA Delft Netherlands;

    Asian Inst Technol Sch Engn &

    Technol Water Engn &

    Management POB 4 Klongluang 12120 Pathumthani Thailand;

    UNESCO IHE Inst forWater Educ Dept Water Sci &

    Engn POB 3015 NL-261DA Delft Netherlands;

    UNESCO UN World Water Assessment Programme WWAP Villa La Colombella I-06134 Perugia Italy;

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  • 正文语种 eng
  • 中图分类 大气科学（气象学）;
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