In the year 2013, the Northwestern Himalaya witnessed an extreme hydrological event that severely affected the upper Ganga Basin. The unexpected high sediment mobilisation in the basin affected the human population, infrastructure, and ecology in several reaches of the Ganga river and its tributaries. In an exceedingly affected reach, the Kedarnath valley, a considerable sediment volume (∼26243 × 10 4 m 3 ) was mobilised during the 2013 extreme hydrological event. In the Srinagar valley, up to 50 × 10 4 m 3 of legacy sediment was washed away during the same event. This sediment mobilisation generated sediment pulses in the affected region, which is assessed through remote sensing, field observations and existing literature, in the Kedarnath and Srinagar valleys. Results show that the evolution of translative, dispersive, and their combined sediment pulse pattern in both selected reaches of the upper Ganga Basin. The mountainous region of the upper Ganga basin has very few monitoring stations observing sediment movement, and data from such stations are mostly unavailable due to which our understanding of the sediment movement in the Himalaya remains very poor. Therefore, it is suggested that there is a need for detailed studies of the sediment transport mechanism in the Himalayan river basins especially during such extreme hydrological events when large volume of sediment is mobilised.

中文翻译：

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评估印度喜马拉雅西北部 Alaknanda 盆地极端水文事件期间的沉积物脉动

2013年，喜马拉雅西北部发生了严重影响恒河盆地上游的极端水文事件。盆地中意外的高沉积物流动影响了恒河及其支流几个河段的人口、基础设施和生态。在 2013 年极端水文事件期间，在受影响严重的河段，Kedarnath 河谷，大量沉积物（~26243 × 10 4 m 3 ）被动员起来。在斯利那加河谷，多达 50 × 10 4 m 3 的遗留沉积物在同一事件中被冲走。这种沉积物流动在受影响地区产生了沉积物脉冲，这是通过遥感、实地观察和现有文献在 Kedarnath 和斯利那加河谷进行评估的。结果表明，翻译、分散、及其在恒河盆地上游两个选定河段的组合沉积物脉冲模式。恒河流域上游山区的泥沙运动监测站很少，而且这些站的数据大多无法获得，因此我们对喜马拉雅地区泥沙运动的了解还很贫乏。因此，建议有必要对喜马拉雅河流域的沉积物输送机制进行详细研究，尤其是在大量沉积物被移动的极端水文事件期间。并且这些站点的数据大多不可用，因此我们对喜马拉雅山脉沉积物运动的了解仍然很差。因此，建议有必要对喜马拉雅河流域的沉积物输送机制进行详细研究，尤其是在大量沉积物被移动的极端水文事件期间。并且这些站点的数据大多不可用，因此我们对喜马拉雅山脉沉积物运动的了解仍然很差。因此，建议有必要对喜马拉雅河流域的沉积物输送机制进行详细研究，尤其是在大量沉积物被移动的极端水文事件期间。