帕隆藏布流域(波密—通麦段)冰川动态变化特征  

Glacier Dynamic Change Characteristics in Parlung Zangbo Basin(Bomi-Tongmai Section)

作　　者：黄国良[1] HUANG Guoliang(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道标准设计》2024年第12期14-20,共7页Railway Standard Design

基　　金：中铁第四勘察设计院集团有限公司科技研发课题(2020K040)。

摘　　要：帕隆藏布流域是我国冰川主要分布地区之一,分析区内冰川表面流速时空演变对于冰川泥石流演化具有重要意义。基于2017-12-12—2022-01-01期间50景Sentinel-1A SAR数据,采用偏移量强度追踪技术获取研究区各泥石流沟内冰川时序表面流速,分析研究区冰川平均流速的时空差异,并以天摩沟与古乡沟作为典型冰川泥石流沟分析其沟内冰川流速的变化。结果表明,研究区内历年冰川平均流速为8.7 cm/d,部分冰川末端运动速度达到19 cm/d;冰川流速季节性变化较明显,春末夏初冰川流速高于其他季节;古乡沟和天摩沟内冰川流速变化为正常季节性变化,未发现冰川异常加速,但沟内仍有暴发大规模泥石流的可能性。The Parlung Zangbo Basin is one of the main glacier distribution areas in China,and understanding the temporal and spatial evolution of glacier surface velocity in this region is significant for studying the evolution of glacial-related debris flows.Using 50 scenes of Sentinel-1A SAR data from December 12,2017,to January 1,2022,and employing the offset intensity tracking technique,this study obtained the time-series surface flow velocity of glaciers within various debris flow gullies in the study area and analyzed the temporal and spatial variation in the average glacier velocity.The Tianmo Gully and Guxiang Gully were selected as typical glacial debris flow gullies to analyze changes in glacier velocity within these areas.Results showed that the average glacier velocity in the study area was approximately 8.7 cm/d,with velocities at some glacier termini reaching up to 19 cm/d.Seasonal variation of glacier velocity was pronounced,with higher velocities observed in late spring and early summer compared to other seasons.The glacier velocities in Guxiang Gully and Tianmo Gully showed normal seasonal variation,with no anomalous acceleration detected;however,there remained a possibility of large-scale debris flow occurring within the gullies.

关 键 词：冰川泥石流 冰川流速 偏移量强度追踪 SAR 帕隆藏布 

分 类 号：U2[交通运输工程—道路与铁道工程] P343.6[天文地球—水文科学] P642[天文地球—地球物理学]