Publication Abstracts

Chen et al. 2018

Chen, Y., X. Liu, J.D. Gulley, and K.D. Mankoff, 2018: Subglacial conduit roughness: Insights from computational fluid dynamics models. Geophys. Res. Lett., 45, no. 20, 11206-11218, doi:10.1029/2018GL079590.

Flow resistance in subglacial conduits regulates the basal water pressure and sliding speeds of glaciers by controlling drainage efficiency and conduit enlargement and closure. Flow dynamics within subglacial conduits, however, remain poorly understood due to limited accessibility. Here we report the results of the first computational fluid dynamics simulations of flow within a realistic subglacial conduit beneath Hansbreen, a polythermal glacier in Svalbard, Norway. The simulated friction factor is 2.34±0.05, which is around 5 to 230 times greater than values (0.01-0.5) commonly used in glacier hydrological modeling studies. Head losses from sinuosity and cross-sectional variations dominate flow resistance (∼94%), whereas surface roughness from rocks and ice features contributes only a small portion (∼6%). Most glacier hydrology models neglect head losses due to sinuosity and cross-sectional variations and thus severely underestimate flow resistance, overestimating the conduit peak effective pressure by 2 times and underestimating the conduit enlargement area by 3.4 times, respectively.

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BibTeX Citation

  author={Chen, Y. and Liu, X. and Gulley, J. D. and Mankoff, K. D.},
  title={Subglacial conduit roughness: Insights from computational fluid dynamics models},
  journal={Geophys. Res. Lett.},

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RIS Citation

ID  - ch06510a
AU  - Chen, Y.
AU  - Liu, X.
AU  - Gulley, J. D.
AU  - Mankoff, K. D.
PY  - 2018
TI  - Subglacial conduit roughness: Insights from computational fluid dynamics models
JA  - Geophys. Res. Lett.
VL  - 45
IS  - 20
SP  - 11206
EP  - 11218
DO  - 10.1029/2018GL079590
ER  -

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