2026年8月26日上午10时30分许，尼泊尔境内支流发生土石流灾害，造成西藏日喀则市吉隆县吉隆口岸重大人员伤亡及失联 3。8月27日（周三），尼泊尔与西藏边境地区遭遇特大山洪，造成至少359人死亡，超过1300人失踪 25。失踪人员中包含数百名外国公民 2。努瓦科特、拉苏瓦和达丁被宣布为受灾最严重地区，多个村庄在物理和通讯上与首都加德满都完全切断 2。山洪摧毁了沿途的城镇，并破坏了超过36座桥梁（含机动车桥和悬索桥）以及十余座水电站大坝 24。
专家分析指出，灾害起源于尼泊尔中部朗塘山脉北部靠近中尼边境的冰川崩塌，地震仪记录到的4.4级震动实为冰川坠落产生的力量，且此次灾害并非冰湖溃决洪水 1。科学家苏迪普·塔库里初步评估认为，洪水是由中尼边境大规模雪崩堵塞河流后溃决引发的 2。中国自然资源航空物探遥感中心地质灾害调查监测中心主任郭兆成推测，灾害原因是尼泊尔境内支流“错坚河”发生高位冰崩碎屑流 3。他表示，冰崩体从海拔5200至5500米的冰川区高处崩落，碎屑流移动速度约每秒50米，影响距离达20多公里，破坏力极强且反应时间极短 3。记录显示，水和碎屑在10分钟内向下游推进了20公里，而去年同区域一次较小山洪用了1小时到达居民点 1。
面对严峻灾情，尼泊尔政府动员了十余架直升机用于转移幸存者和运送救援物资，印度和中国也协调参与救灾行动 2。截至周四中午，至少414名被困人员（含164名外国人）已被直升机空运转移 2。尼泊尔信息与通信部长比克拉姆·蒂米西纳表示：“我们正在全力以赴营救生还者” 2。然而，灾区仍面临次生灾害风险，山洪形成的堰塞湖水位持续上涨，存在再次溃决的隐患 5。此外，中国当局警告西藏吉荣地区另一湖泊已经溢流，预计未来三天将有300万吨水流入该湖 2。专家指出，尼泊尔目前的预警系统仅覆盖约1%的风险区域，且气候变化可能使此类山洪事件变得更加频繁和严重 1。
Massive flash floods and debris flows have devastated the Nepal-Tibet border region, killing at least 359 people and leaving over 1,300 others missing, including hundreds of foreign citizens 25. The disaster occurred on Wednesday, August 27, 2026, with water and debris advancing 20 kilometers downstream in just 10 minutes 1. It severely impacted the Nepali districts of Nuwakot, Rasuwa, and Dhading, cutting off multiple villages from the capital, Kathmandu, both physically and in terms of communication 2. The raging waters destroyed more than 36 bridges, including motorable and suspension bridges, as well as over a dozen hydropower dams 2. BBC Verify has traced the deadly path of the flash floods through verified videos and satellite imagery, confirming the widespread destruction of towns and bridges across the border area 4.
Experts have offered varying preliminary assessments regarding the exact cause of the catastrophe. Analysts indicated that the disaster originated from a glacier collapse in the northern Langtang range of central Nepal, near the border, rather than a glacial lake outburst flood 1. Seismographs recorded a 4.4-magnitude tremor, which was attributed to the force of the falling ice rather than a tectonic earthquake 1. In contrast, scientist Sudip Thakuri preliminarily assessed that the floods were triggered by a massive avalanche that blocked a river before the blockage gave way 2. Furthermore, Guo Zhaocheng, director of the Geological Disaster Survey and Monitoring Center at the China Aero Geophysical Survey and Remote Sensing Center, speculated that a high-altitude ice avalanche debris flow occurred in the Cuojian River, a tributary on the Nepali side 3. He explained that the ice mass collapsed from a glacier zone at an altitude of 5,200 to 5,500 meters, with the debris flow traveling at approximately 50 meters per second and covering a distance of over 20 kilometers 3. Additionally, a debris flow disaster originating from the Nepali side struck the Gyirong Port in Tibet's Xigaze city around 10:30 a.m. on August 26, resulting in major casualties and missing persons 3.
Rescue operations are underway as authorities race to deliver aid and evacuate survivors. Nepal has mobilized over a dozen helicopters to transfer trapped individuals and transport relief supplies, successfully airlifting at least 414 people, including 164 foreigners, by Thursday noon 2. India and China are also coordinating to participate in the relief efforts 2. "We are putting our all-out efforts to rescue people alive," stated Bikram Timilsina, Nepal's Minister for Information and Communications 2. However, severe risks remain as authorities warn that the water level of the barrier lake formed by the flash floods continues to rise, posing a threat of another breach 5. Furthermore, Chinese authorities have warned that another lake in the Gyirong area of Tibet has already overflowed, with an estimated 3 million tons of water expected to flow into the lake over the next three days 2. Highlighting the region's vulnerability, experts noted that Nepal's early warning system currently covers only about 1% of the risk areas, and a smaller flash flood in the same area took an hour to reach settlements last year 1. Researchers also warned that climate change could make such events more frequent and severe 1.
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