Effects of slope aspect on the evolution of frozen soil layers in cold regions: A case study of the Hada Mountain water conveyance canal in western Jilin Province - Jiaqi Liu; Boxin Wang; Qing Wang; Huie Chen; Tianlue Wang; Lanting Fu; Xiaorui Huang; Xinglin Peng; He Zheng; Jiaxin Lu (Cold Regions Science and Technology, 2026)