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GroMoPo Metadata for Wadden Sea advective transport model


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Created: Feb 07, 2023 at 8:10 p.m.
Last updated: Feb 07, 2023 at 8:10 p.m.
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Abstract

Effective porosity plays an important role in contaminant management. However, the effective porosity is often assumed to be constant in space and hence heterogeneity is either neglected or simplified in transport model calibration. Based on a calibrated highly parametrized flow model, a three-dimensional advective transport model (MODPATH) of a 1300 km(2) coastal area of southern Denmark and northern Germany is presented. A detailed voxel model represents the highly heterogeneous geological composition of the area. Inverse modelling of advective transport is used to estimate the effective porosity of 7 spatially distributed units based on apparent groundwater ages inferred from 11 C-14 measurements in Pleistocene and Miocene aquifers, corrected for the effects of diffusion and geochemical reactions. By calibration of the seven effective porosity units, the match between the observed and simulated ages is improved significantly, resulting in a reduction of ME of 99 % and RMS of 82 % compared to a uniform porosity approach. Groundwater ages range from a few hundred years in the Pleistocene to several thousand years in Miocene aquifers. The advective age distributions derived from particle tracking at each sampling well show unimodal (for younger ages) to multimodal (for older ages) shapes and thus reflect the heterogeneity that particles encounter along their travel path. The estimated effective porosity field, with values ranging between 4.3 % in clay and 45 % in sand formations, is used in a direct simulation of distributed mean groundwater ages. Although the absolute ages are affected by various uncertainties, a unique insight into the complex three-dimensional age distribution pattern and potential advance of young contaminated groundwater in the investigated regional aquifer system is provided, highlighting the importance of estimating effective porosity in groundwater transport modelling and the implications for groundwater quantity and quality assessment and management.

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Denmark, Germany
North Latitude
55.1685°
East Longitude
9.4246°
South Latitude
54.9232°
West Longitude
8.5903°

Content

Additional Metadata

Name Value
DOI 10.5194/hess-22-4843-2018
Depth 400
Scale 1 001 - 10 000 km²
Layers > 20 layers
Purpose Groundwater resources;Groundwater contamination;Salt water intrusion
GroMoPo_ID 127
IsVerified True
Model Code MODFLOW
Model Link https://doi.org/10.5194/hess-22-4843-2018
Model Time SS
Model Year 2018
Model Authors R. Meyer, P. Engesgaard, K. Hinsby, J. A. Piotrowski, T. O. Sonnenborg
Model Country Denmark, Germany
Data Available Report/paper only
Developer Email reme@ign.ku.dk
Dominant Geology Unconsolidated sediments
Developer Country Denmark
Publication Title Estimation of effective porosity in large-scale groundwater models by combining particle tracking, auto-calibration and C-14 dating
Original Developer No
Additional Information
Integration or Coupling Solute transport
Evaluation or Calibration Groundwater age C14
Geologic Data Availability

How to Cite

GroMoPo, D. Zamrsky (2023). GroMoPo Metadata for Wadden Sea advective transport model, HydroShare, http://www.hydroshare.org/resource/c19ffce5e8e24b1282a29579dc8fbac7

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/
CC-BY

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