The overflowing water of the Salt Lake in Hoh Xil has brought great potential safety hazards to the downstream rail transit facilities.We analyzed monitoring data of remote sensing images over the Salt Lake in Hoh Xil,temperature,rainfall,ground temperature and the upper limit changes of permafrost in the area,as well as the water level and flow velocity of the overflowing river.Based on the above data,the spatiotemporal evolution law of the Salt Lake in Hoh Xil,the causes of overflow,and the poten-tial safety risks to the downstream were studied.The research showed that spatially,the Salt Lake in Hoh Xil presented a three-stage change characteristic of"K-C-O".In 2022,the area of the Salt Lake in Hoh Xil was 3.73 times larger than that in 2011.Temporally,it showed an obvious two-stage growth period of"fast-slow".The growth rate in the fast period was 2.78 times that in the slow period.The overflow rate of the Salt Lake in Hoh Xil to the downstream engineering corridor was 0.31 km/a.With the seasonal ebb and flow and the change of the"peak-valley"value of flow velocity,it has caused certain scouring and thermal ero-sion effects on the bridge pile foundation downstream.The overflow of the Salt Lake in Hoh Xil was positively correlated with fac-tors such as temperature,rainfall,and ground temperature in the permafrost region.In the past 30 years,the temperature increase rate was 0.052°C/a,the linear growth rate of annual average rainfall was 3.09 mm/a,and the linear temperature increase rate of ground temperature was 0.036°C/a.The characteristics of warm and humid climate were the main causes of Salt Lake in Hoh Xil overflow.The research results can provide theoretical and technical guidance for downstream facility protection.
关键词
盐湖漫溢/盐湖面积/气候变化/地温/可可西里盐湖/青藏高原
Key words
overflow of salt lake/area of salt lake/climate change/ground temperature/Salt Lake in Hoh Xil/Qinghai-Ti-bet Plateau
维普
万方数据