Biological and Environmental Research - Earth and Environmental System Sciences
Earth and Environmental System Modeling

Are channels standalone? Analysis of channel-land interactions using PAWS+CLM

TitleAre channels standalone? Analysis of channel-land interactions using PAWS+CLM
Publication TypeConference Abstract or Presentation
Year of Publication2014
AuthorsShen, Chaopeng, Smithgall Kurt M., and Riley William J.
Conference NameCESM Land Model Working Group Meeting
Conference LocationBreckenridge, CO
Abstract / Summary

Large-scale land surface models commonly assumed that land-channel exchanges are unidirectional, in which the channel network receives runoff, baseflow, sediments, and other materials from land and conveys them to the outlet. The physiographic and geomorphological characteristics of channels, as well as flow conditions, exert no influence on simulated upland dynamics. In this work we study the feedbacks to upland hydrologic and ecosystem states and fluxes provided by channels. We employ a physically-based surface-subsurface processes model (PAWS+CLM) that fully resolves the multi-way interactions between channel flow, overland flow, groundwater, soil water and wetlands. We found notable influences of channels on land surface fluxes, which are explained by the baseflow mechanism and the efficient conveyance mechanism. We systematically quantify the extent of the impact and link channel characteristics to these impacts. Our results indicate that to further improve our understanding of the land-water system, the influence of channels need to be included in integrated models.

URLhttps://www.cesm.ucar.edu/events/workshops/ws.2014/presentations/lmwg/shen.pdf
Conference Name: CESM Land Model Working Group Meeting
Year of Publication: 2014
Publication Date: 06/2014

Large-scale land surface models commonly assumed that land-channel exchanges are unidirectional, in which the channel network receives runoff, baseflow, sediments, and other materials from land and conveys them to the outlet. The physiographic and geomorphological characteristics of channels, as well as flow conditions, exert no influence on simulated upland dynamics. In this work we study the feedbacks to upland hydrologic and ecosystem states and fluxes provided by channels. We employ a physically-based surface-subsurface processes model (PAWS+CLM) that fully resolves the multi-way interactions between channel flow, overland flow, groundwater, soil water and wetlands. We found notable influences of channels on land surface fluxes, which are explained by the baseflow mechanism and the efficient conveyance mechanism. We systematically quantify the extent of the impact and link channel characteristics to these impacts. Our results indicate that to further improve our understanding of the land-water system, the influence of channels need to be included in integrated models.

Conference Location: Breckenridge, CO
Citation:
Shen, C, KM Smithgall, and WJ Riley.  2014.  "Are channels standalone? Analysis of channel-land interactions using PAWS+CLM."  In CESM Land Model Working Group Meeting.  Presented at Breckenridge, CO.