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A Critical Analysis of Transverse Dispersivity Field Data.
Alraune Zech1, Sabine Attinger1,2, Alberto Bellin3
1Helmholtz Centre for Environmental Research - UFZ, Permoserstr. 15, 04318 Leipzig, Germany.
Ground Water
|November 2, 2018
Summary
Transverse dispersion coefficients are difficult to estimate in the field. Reliable estimates are formation-specific and do not show clear scale-dependence, challenging common practices.
Area of Science:
- Environmental Science
- Hydrogeology
- Geochemistry
Background:
- Transverse dispersion, orthogonal to flow, is less studied than longitudinal dispersion.
- Estimating transverse dispersion coefficients in the field is challenging due to resolution requirements.
- Current practice often uses a heuristic ratio (1/10) of longitudinal to transverse dispersivity, which is questionable.
Purpose of the Study:
- To investigate scale relationships for field-scale transverse dispersivities.
- To evaluate the reliability of existing literature estimates of transverse dispersivity.
- To provide guidance for estimating transverse dispersivity in site characterization.
Main Methods:
- Compiled field-scale transverse dispersivity estimates from existing publications.
- Analyzed data for scale-dependence and relationships with longitudinal dispersivity.
- Assessed the reliability of different experimental and analytical methods.
Main Results:
- Many literature estimates of transverse dispersivity are of low reliability.
- Reliable estimates are formation-specific and span three orders of magnitude.
- No clear scale-dependence was found; ratios to longitudinal dispersivity are site-specific and variable.
Conclusions:
- Transverse dispersivity is highly variable and site-specific.
- The common practice of using a fixed ratio to longitudinal dispersivity is unreliable.
- Transverse dispersivity should be estimated independently during site characterization when significant.
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