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Erschienen in:
13.12.2016 | Comment
Comment on “HydrogeoSieveXL: an Excel-based tool to estimate hydraulic conductivity from grain-size analysis”: technical note published in Hydrogeology Journal (2015) 23: 837–844, by J. F. Devlin
Erschienen in: Hydrogeology Journal | Ausgabe 2/2017
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Excerpt
The subject technical note (Devlin 2015) proposes an Excel-based spreadsheet program, HyrodgeoSieveXL, presenting an easily accessible, reliable and user-friendly technique for estimating hydraulic conductivity from a mechanical grain-size analysis of samples. The graphical presentation offers a simplified correlation of numerous patterns for the calculation of hydraulic conductivity, based on the use of a certain “effective grain size”. If the criteria for the selection of effective grain size (used as a variable in the pattern) cause systematic error, then the validity of the program comes into question. Exactly such cases are present in some of the equations given in the subject article’s Table 1. This statement refers to: (1) some of the equations using effective grain size d 10, and (2) equations using mean grain size of the sample.
Table 1
Values of calculation of mean grain sizes from Slichter’s (1905) data
|
Samples
|
Mean grain size from mechanical analysis data, d m (mm)
|
Uniformity
U = d 60/d 10
|
Determined by King’s
aspirator, d m
|
||||
|---|---|---|---|---|---|---|---|
|
d a
|
d g
|
d h
|
(d g + d h)/2
|
(mm)
|
%
|
||
|
Picnic Point gravel
|
3.12
|
1.66
|
0.79
|
1.23
|
3.7
|
0.93
|
25.6
|
|
Madison glacial sand
|
0.8
|
0.51
|
0.31
|
0.41
|
1.6
|
0.40
|
22
|