[1746] - The influence of riverbed heterogeneity patterns on river-aquifer exchange fluxes under different connection regimes

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Citation
Tang, Q., Kurtz, W., Schilling, O. S., Brunner, P., Vereecken, H., Hendricks-Franssen, H., 2017. The influence of riverbed heterogeneity patterns on river-aquifer exchange fluxes under different connection regimes. Journal of Hydrology, 554, 383 - 396. DOI: 10.1016/j.jhydrol.2017.09.031.
Identification
Title(s):Main Title: The influence of riverbed heterogeneity patterns on river-aquifer exchange fluxes under different connection regimes
Description(s):Abstract: Riverbed hydraulic conductivity (K) is a critical parameter for the prediction of exchange fluxes between a river and an aquifer. In this study, the role of heterogeneity patterns was explored using the fully integrated hydrological model HydroGeoSphere simulating complex, variably saturated subsurface flow. A synthetic 3-D river-aquifer reference model was constructed with a heterogeneous riverbed using non-multi-Gaussian patterns in the form of meandering channels. Data assimilation was used to test the ability of different riverbed K patterns to reproduce hydraulic heads, riverbed K and river-aquifer exchange fluxes. Both fully saturated as well as variably saturated conditions underneath the riverbed were tested. The data assimilation experiments with the ensemble Kalman filter (EnKF) were carried out for four types of geostatistical models of riverbed K fields: (i) spatially homogeneous, (ii) heterogeneous with multi-Gaussian distribution, (iii) heterogeneous with non-multi-Gaussian distribution (channelized structures) and (iv) heterogeneous with non-multi-Gaussian distribution (elliptic structures). For all data assimilation experiments, state variables and riverbed K were updated by assimilating hydraulic heads. For saturated conditions, heterogeneous geostatistical models allowed a better characterization of net exchange fluxes than a homogeneous approximation. Among the three heterogeneous models, the performance of non-multi-Gaussian models was superior to the performance of the multi-Gaussian model, but the two tested non-multi-Gaussian models showed only small differences in performance from one another. For the variably saturated conditions both the multi-Gaussian model and the homogeneous model performed clearly worse than the two non-multi-Gaussian models. The two non-multi-Gaussian models did not show much difference in performance. This clearly shows that characterizing heterogeneity of riverbed K is important. Moreover, particularly under variably saturated flow conditions the mean and the variance of riverbed K do not provide enough information for exchange flux characterization and additional histogram information of riverbed K provides crucial information for the reproduction of exchange fluxes.
Identifier(s):DOI: 10.1016/j.jhydrol.2017.09.031
Citation Advice:Tang, Q., Kurtz, W., Schilling, O.S., Brunner, P., Vereecken, H., Hendricks Franssen, H.-J. (2017). The influence of riverbed heterogeneity patterns on river-aquifer exchange fluxes under different connection regimes, Journal of Hydrology, 554, 383-396.
Responsible Party
Creator(s):Author: Qi Tang
Author: Wolfgang Kurtz
Author: Oliver S. Schilling
Author: Philip Brunner
Author: Harry Vereecken
Author: Harrie-Jan Hendricks-Franssen
Publisher:ElSevier
Topic
TR32 Topic:Soil
Related Sub-project(s):C6
Subject(s):CRC/TR32 Keywords: Data Assimilation, Hydrological Modelling
File Details
File Name:Tang_2017_JoH.pdf
Data Type:Text
File Size:2435 kB (2.378 MB)
Date(s):Date Accepted: 2017-09-15
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
Download Permission:OnlyTR32
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Licence:TR32DB Data policy agreement
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Measurement Region:None
Measurement Location:--None--
Specific Informations - Publication
Status:Accepted
Review:PeerReview
Year:2017
Type:Article
Article Type:Journal
Source:Journal of Hydrology
Volume:554
Page Range:383 - 396
Metadata Details
Metadata Creator:Wolfgang Kurtz
Metadata Created:2017-12-20
Metadata Last Updated:2017-12-20
Subproject:C6
Funding Phase:3
Metadata Language:English
Metadata Version:V42
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