TY - JOUR
T1 - UAV-based geomorphological evolution of the Terminus Area of the Hailuogou Glacier, Southeastern Tibetan Plateau between 2017 and 2020
AU - Xu, Shuyang
AU - Fu, Ping
AU - Quincey, Duncan
AU - Feng, Meili
AU - Marsh, Stuart
AU - Liu, Qiao
N1 - Funding Information:
The authors greatly appreciate helpful and constructive suggestions and comments from the two anonymous referees, Prof. Ian S. Evans and Prof. Markus Stoffel (editor). This research was supported by the National Natural Science Foundation of China (Grand No. 41971078 and 51909126) and the Ph.D. faculty scholarship provided by the University of Nottingham Ningbo China. We also thank the Hailuogou Scenic Area Administration for the help in the field trips.
Funding Information:
The authors greatly appreciate helpful and constructive suggestions and comments from the two anonymous referees, Prof. Ian S. Evans and Prof. Markus Stoffel (editor). This research was supported by the National Natural Science Foundation of China (Grand No. 41971078 and 51909126 ) and the Ph.D. faculty scholarship provided by the University of Nottingham Ningbo China . We also thank the Hailuogou Scenic Area Administration for the help in the field trips.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/8/15
Y1 - 2022/8/15
N2 - Hailuogou (HLG) Glacier, a rapidly receding temperate glacier in the southeastern Tibetan Plateau, has been observed to lose mass partly through ice frontal mechanical ablation (i.e., ice collapse). These events are difficult to monitor and quantify due to their small scale and frequent nature. However, recent developments in Uncrewed Aerial Vehicles (UAV) have provided a possible approach to track their spatiotemporal variation and their impact on the geomorphological evolution of the glacier terminus area. Here, we present analysis from UAV surveys conducted over eight field campaigns to the HLG Glacier, providing evidence of glacier change between October 2017 and November 2020. Structure from Motion with Multi-View Stereo (SfM-MVS) was applied to produce multi-temporal Digital Surface Models (DSMs) and orthophoto mosaics, from which geomorphological maps and DEMs of Difference (DoDs) were derived to quantify glacier changes. These analyses reveal that at the margins of the glacier terminus retreated 132.1 m over the period of analysis, and that in the area specifically affected by collapsing (i.e., the glacier collapsed terminus), it retreated 236.4 m. Overall the volume lost in the terminal area was of the order of 184.61 ± 10.32 × 104 m3, within which the volume change due to observed collapsing events comprises approximately 28%. We show that ice volume changes at the terminus due to a single ice collapse event may exceed the interannual level of volume change, and the daily volume of ice loss due to ice calving exceeds the seasonal and interannual level by a factor of ~2.5 and 4. Our results suggest that the evolution of the HLG Glacier terminus is dominantly controlled by the frontal ice-water interactions. If the future evolution of glaciers such as HLG Glacier is to be robustly predicted, the contribution of mechanical ablation should be accounted for by numerical models.
AB - Hailuogou (HLG) Glacier, a rapidly receding temperate glacier in the southeastern Tibetan Plateau, has been observed to lose mass partly through ice frontal mechanical ablation (i.e., ice collapse). These events are difficult to monitor and quantify due to their small scale and frequent nature. However, recent developments in Uncrewed Aerial Vehicles (UAV) have provided a possible approach to track their spatiotemporal variation and their impact on the geomorphological evolution of the glacier terminus area. Here, we present analysis from UAV surveys conducted over eight field campaigns to the HLG Glacier, providing evidence of glacier change between October 2017 and November 2020. Structure from Motion with Multi-View Stereo (SfM-MVS) was applied to produce multi-temporal Digital Surface Models (DSMs) and orthophoto mosaics, from which geomorphological maps and DEMs of Difference (DoDs) were derived to quantify glacier changes. These analyses reveal that at the margins of the glacier terminus retreated 132.1 m over the period of analysis, and that in the area specifically affected by collapsing (i.e., the glacier collapsed terminus), it retreated 236.4 m. Overall the volume lost in the terminal area was of the order of 184.61 ± 10.32 × 104 m3, within which the volume change due to observed collapsing events comprises approximately 28%. We show that ice volume changes at the terminus due to a single ice collapse event may exceed the interannual level of volume change, and the daily volume of ice loss due to ice calving exceeds the seasonal and interannual level by a factor of ~2.5 and 4. Our results suggest that the evolution of the HLG Glacier terminus is dominantly controlled by the frontal ice-water interactions. If the future evolution of glaciers such as HLG Glacier is to be robustly predicted, the contribution of mechanical ablation should be accounted for by numerical models.
KW - Frontal ice collapsing
KW - Geomorphological evolution
KW - Hailuogou Glacier
KW - Uncrewed aerial vehicles
UR - http://www.scopus.com/inward/record.url?scp=85130772509&partnerID=8YFLogxK
U2 - 10.1016/j.geomorph.2022.108293
DO - 10.1016/j.geomorph.2022.108293
M3 - Article
AN - SCOPUS:85130772509
SN - 0169-555X
VL - 411
JO - Geomorphology
JF - Geomorphology
M1 - 108293
ER -