The cone-cylindrical pile foundation is a kind of shallow buried foundation, which needs to be open excavated and backfilled during construction. density the backfill closely related refreezing process backfill. However, there still lack relevant research on relationship between method model experiment selected study under three soil densities. controlled 1.83, 1.62 1.36 g/cm3, times freeze–tha...

Abstract We drilled an 81.2-m-long ice core in the accumulation area (5860 m a.s.l.) of Trambau Glacier Rolwaling region during October–November 2019. The drilling operation was conducted with a lightweight electro-mechanical drill system after two reconnaissance fieldworks 2017 and 2018, which shallow firn cores were hand auger. samples transported by helicopters at high elevation 6000 a.s.l. ...

Impacts into icy bodies often generate near-surface melt chambers and thermal perturbations that soften the ice. We explore post-impact evolution of non-penetrating impacts Europa's ice shell. Simulations viscous deformation show dense impact melts founder before refreezing. If transient cavity depth exceeds half shell thickness, over 40% drains underlying ocean. Drainage from to ocean occurs o...

The mechanism of pile-soil reaction in frozen ground is not clear at present, but it obvious that the reduction dead weight will be beneficial to seismic resistance bridges. In view limited bridge engineering practice high risk permafrost regions, paper addressed structural performance superstructure and its effect on piles these special regions. Four superstructures with different weights were...

In the central Arctic Ocean, autonomous observations of the ocean mixed layer and ice documented the transition from cold spring to early summer in 2011. Ice-motion measurements using GPS drifters captured three events of lead opening and ice ridge formation in May and June. Satellite sea ice concentration observations suggest that locally observed lead openings were part of a larger-scale patt...

The generation and release of meltwater during the spring snowmelt season can be delayed because of spring storm episodes with snow accumulation and/or sustained subfreezing temperatures. The delayed release of snowmelt often extends beyond the particular storm event because of changes to the internal state of energy in the snowpack that prevents transmission of meltwater. Following a storm, tw...

[1] The extent and thickness of the Arctic sea ice cover has decreased dramatically in the past few decades with minima in sea ice extent in September 2005 and 2007. These minima have not been predicted in the IPCC AR4 report, suggesting that the sea ice component of climate models should more realistically represent the processes controlling the sea ice mass balance. One of the processes poorl...