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Riverbed permeabilities: information from pooled data
1Catchment Systems Modelling, CEH Wallingford (formerly the Institute of Hydrology), Wallingford, Oxfordshire, U.K. anc@ceh.ac.uk
Ground Water
|July 13, 2001
Summary
This study compiles hydraulic conductivity values for river channel materials, revealing a wide range (10^-9 to 10^-2 m/s). These data offer guidance for hydrological assessments when site-specific data are unavailable.
Area of Science:
- Environmental Science
- Hydrogeology
- Geotechnical Engineering
Background:
- River channel-lining materials exhibit variable hydraulic conductivity.
- Accurate hydraulic conductivity data are crucial for hydrological and hydrogeological assessments.
- Generalizing these values is challenging due to factors like sediment type, scale, and measurement methods.
Purpose of the Study:
- To compile and analyze numerical values of hydraulic conductivities for river channel-lining materials.
- To establish a guideline basis of representative hydraulic conductivity values.
- To inform hydrological and hydrogeological assessments where specific investigations are not feasible.
Main Methods:
- Assembling numerical values of hydraulic conductivities from published and unpublished sources.
- Analyzing the range and distribution of hydraulic conductivity values.
- Comparing values derived from numerical modeling with field and laboratory analyses.
Main Results:
- Hydraulic conductivities range from below 1.0 x 10^-9 to above 1.0 x 10^-2 m/s.
- Values are concentrated between 1.0 x 10^-7 and 1.0 x 10^-3 m/s.
- Numerical modeling yields more conservative values than field/lab analyses, with significant site variability.
Conclusions:
- A broad spectrum of hydraulic conductivity exists for river channel materials.
- Generalization is complex, influenced by sediment, scale, and methodology.
- The compiled data serve as a valuable reference for hydrological and hydrogeological assessments.