TY - JOUR
T1 - Fully-coupled hydrologic processes for modeling landscape evolution
AU - Zhang, Yu
AU - Slingerland, Rudy
AU - Duffy, Christopher
N1 - Funding Information:
Thanks for the constructive comments from the three anonymous reviewers. This work was facilitated by NSF Critical Zone Observatory program grants to CJD ( EAR 07-25019 ) and SLB ( EAR 12-39285 , EAR 13-31726 ). This research was conducted in Penn State's Stone Valley Forest, which is supported and managed by the Penn State's Forestland Management Office in the College of Agricultural Sciences. Student research grant from the Geological Society of America also provides partial support for this research. Author contributions: Y.Z. and R.S. designed the research; Y.Z. performed the research and analyzed the data; C.D. provided support on hydrological analysis and PIHM model integration, and Y.Z., R.S. and C.D. wrote the paper.
Publisher Copyright:
© 2016 Elsevier Ltd.
PY - 2016/8/1
Y1 - 2016/8/1
N2 - Although current landscape evolution models can predict landscapes with specific concave-convex slopes, regolith thicknesses, drainage densities and relief, these models rarely include realistic groundwater and overland flows, and channel-hillslope interactions. To overcome the potential drawbacks, this study couples hydrologic processes with hillslope and channel sediment transport processes to form a new hydrologic-morphodynamic model (LE-PIHM) for regolith formation and landscape evolution. Two scenarios with and without groundwater flow are presented to demonstrate the importance of this coupling. Comparison of the steady state landforms indicates that hillslopes are steeper and relief is higher with groundwater flow. The sensitivity of the solution to mesh geometry is tested and it is shown that model simulations maintain the characteristic features of a landscape over a reasonable range of maximum area and minimum interior angle. To predict long-term landscape change, a morphological acceleration technique is presented and a method for choosing an optimal morphological scale factor is introduced.
AB - Although current landscape evolution models can predict landscapes with specific concave-convex slopes, regolith thicknesses, drainage densities and relief, these models rarely include realistic groundwater and overland flows, and channel-hillslope interactions. To overcome the potential drawbacks, this study couples hydrologic processes with hillslope and channel sediment transport processes to form a new hydrologic-morphodynamic model (LE-PIHM) for regolith formation and landscape evolution. Two scenarios with and without groundwater flow are presented to demonstrate the importance of this coupling. Comparison of the steady state landforms indicates that hillslopes are steeper and relief is higher with groundwater flow. The sensitivity of the solution to mesh geometry is tested and it is shown that model simulations maintain the characteristic features of a landscape over a reasonable range of maximum area and minimum interior angle. To predict long-term landscape change, a morphological acceleration technique is presented and a method for choosing an optimal morphological scale factor is introduced.
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U2 - 10.1016/j.envsoft.2016.04.014
DO - 10.1016/j.envsoft.2016.04.014
M3 - Article
AN - SCOPUS:84966318538
VL - 82
SP - 89
EP - 107
JO - Environmental Modelling and Software
JF - Environmental Modelling and Software
SN - 1364-8152
ER -