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photo of Zheng Duan on Lund webpage

Zheng Duan

Senior lecturer

photo of Zheng Duan on Lund webpage

The Importance of Impoundment interception in Simulating Riverine Dissolved Organic Carbon

Author

  • Jiao Jiao Liu
  • Jun Zhi Liu
  • Xin Zhong Du
  • Ren Kui Guo
  • Zheng Duan
  • Bin Jie Yuan
  • Yong Qin Liu

Summary, in English

Modeling of riverine dissolved organic carbon (DOC) dynamics is of great importance for the global carbon budget. Impoundment interception changes the travel time of water and DOC from upslope contributing areas, exerting substantial influence on riverine DOC dynamics in the catchments with many impoundments. However, the impact of impoundment interception representation on riverine DOC modeling has not been evaluated so far. This study investigated to what extent impoundment interception representation affects DOC simulations using a newly developed catchment-scale DOC model, which can represent the upslope contributing areas of impoundments and the impoundment interception process. The results showed that streamflow and DOC load simulation were well simulated regardless of whether impoundment interception was represented, but the simulation of DOC concentrations was satisfiable only when impoundment interception was taken into account. The simulation without impoundment interception produced unrealistic fluctuation of DOC concentration due to the direct mixing of DOC from different sources with contrasting concentration gradients. These results underscored the significance of employing an appropriate model structure for riverine DOC simulation. It is strongly recommended that DOC concentration be utilized for model evaluation in order to attain robust simulation outcomes. Moreover, the newly developed model in this study keeps a balance between the completeness of process presentation and model complexity, occupying a unique “ecological niche” among catchment-scale riverine DOC models.

Department/s

  • MERGE: ModElling the Regional and Global Earth system
  • Dept of Physical Geography and Ecosystem Science
  • BECC: Biodiversity and Ecosystem services in a Changing Climate

Publishing year

2024-11

Language

English

Publication/Series

Water Resources Research

Volume

60

Issue

11

Document type

Journal article

Publisher

American Geophysical Union (AGU)

Topic

  • Oceanography, Hydrology, Water Resources

Keywords

  • carbon cycling
  • dissolved organic carbon
  • impoundment
  • river
  • watershed model

Status

Published

ISBN/ISSN/Other

  • ISSN: 0043-1397