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Effects of linking a soil-water-balance model with a groundwater-flow model

Ground Water Journal

By:
, , and
DOI: 10.1111/j.1745-6584.2012.01000.x

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Abstract

A previously published regional groundwater-flow model in north-central Nebraska was sequentially linked with the recently developed soil-water-balance (SWB) model to analyze effects to groundwater-flow model parameters and calibration results. The linked models provided a more detailed spatial and temporal distribution of simulated recharge based on hydrologic processes, improvement of simulated groundwater-level changes and base flows at specific sites in agricultural areas, and a physically based assessment of the relative magnitude of recharge for grassland, nonirrigated cropland, and irrigated cropland areas. Root-mean-squared (RMS) differences between the simulated and estimated or measured target values for the previously published model and linked models were relatively similar and did not improve for all types of calibration targets. However, without any adjustment to the SWB-generated recharge, the RMS difference between simulated and estimated base-flow target values for the groundwater-flow model was slightly smaller than for the previously published model, possibly indicating that the volume of recharge simulated by the SWB code was closer to actual hydrogeologic conditions than the previously published model provided. Groundwater-level and base-flow hydrographs showed that temporal patterns of simulated groundwater levels and base flows were more accurate for the linked models than for the previously published model at several sites, particularly in agricultural areas.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Effects of linking a soil-water-balance model with a groundwater-flow model
Series title:
Ground Water Journal
DOI:
10.1111/j.1745-6584.2012.01000.x
Volume
51
Issue:
4
Year Published:
2013
Language:
English
Publisher:
Wiley
Contributing office(s):
Nebraska Water Science Center
Description:
10 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Ground Water Journal
First page:
613
Last page:
622
Country:
United States
State:
Nebraska