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Representation of bi‐directional fluxes between groundwater and surface water in a bucket‐type hydrological model


Staudinger, Maria; Seibert, Jan; van Meerveld, H J (2021). Representation of bi‐directional fluxes between groundwater and surface water in a bucket‐type hydrological model. Water Resources Research, 57(9):e2020WR028835.

Abstract

In most bucket-type hydrological models, water can only flow from the groundwater to the stream and the flux is based on the groundwater storage. However, many catchments have losing stream sections, where streamflow recharges the groundwater. We developed a formulation to represent groundwater recharge by streamwater in a bucket-type model and tested this formulation for the Panola Mountain Research Watershed to demonstrate its function and assess its performance. The upper reach of the Panola catchment is often dry and highly affected by flow from a bedrock outcrop; further downstream the stream is perennial. We simulated streamflow with the fully lumped version of a bucket-type model and compared it to (a) a variant with sub-catchments to more realistically represent the low storage and quick response from the bedrock outcrop and (b) a variant that also includes the bi-directional exchange
between the groundwater and the stream. For all three model variants, we compared simulated and observed streamflow and groundwater dynamics. Although the gain in overall model performance by including the bi-directional exchange between the groundwater and the stream was small, the explicit representation of this exchange led to better streamflow simulations during drying-down and wetting-up periods. For Panola the fluxes along the stream appeared less important than subsurface drainage from the upper sub-catchment to the downstream sub-catchment. We recommend considering the bi-directional fluxes between groundwater and the stream in bucket-type hydrological models where these processes are important, and the focus of the simulations is on low flow conditions.

Abstract

In most bucket-type hydrological models, water can only flow from the groundwater to the stream and the flux is based on the groundwater storage. However, many catchments have losing stream sections, where streamflow recharges the groundwater. We developed a formulation to represent groundwater recharge by streamwater in a bucket-type model and tested this formulation for the Panola Mountain Research Watershed to demonstrate its function and assess its performance. The upper reach of the Panola catchment is often dry and highly affected by flow from a bedrock outcrop; further downstream the stream is perennial. We simulated streamflow with the fully lumped version of a bucket-type model and compared it to (a) a variant with sub-catchments to more realistically represent the low storage and quick response from the bedrock outcrop and (b) a variant that also includes the bi-directional exchange
between the groundwater and the stream. For all three model variants, we compared simulated and observed streamflow and groundwater dynamics. Although the gain in overall model performance by including the bi-directional exchange between the groundwater and the stream was small, the explicit representation of this exchange led to better streamflow simulations during drying-down and wetting-up periods. For Panola the fluxes along the stream appeared less important than subsurface drainage from the upper sub-catchment to the downstream sub-catchment. We recommend considering the bi-directional fluxes between groundwater and the stream in bucket-type hydrological models where these processes are important, and the focus of the simulations is on low flow conditions.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Scopus Subject Areas:Physical Sciences > Water Science and Technology
Uncontrolled Keywords:Water Science and Technology
Language:English
Date:1 September 2021
Deposited On:26 Nov 2021 09:57
Last Modified:26 Apr 2024 01:36
Publisher:American Geophysical Union
ISSN:0043-1397
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1029/2020wr028835
  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)