scholarly journals Sensitivity analysis of hydraulic conductivity and Manning'snparameters lead to new method to scale effective hydraulic conductivity across model resolutions

2018 ◽  
Vol 33 (3) ◽  
pp. 332-349 ◽  
Author(s):  
Lauren M. Foster ◽  
Reed M. Maxwell
Keyword(s):  
Sensitivity Analysis ◽  
Hydraulic Conductivity ◽  
New Method ◽  
Effective Hydraulic Conductivity

Assessment of clogging in constructed wetlands by saturated hydraulic conductivity measurements

2019 ◽  
Vol 79 (2) ◽  
pp. 314-322 ◽  
Author(s):  
F. Licciardello ◽  
R. Aiello ◽  
V. Alagna ◽  
M. Iovino ◽  
D. Ventura ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Hydraulic Conductivity ◽  
Constructed Wetlands ◽  
Spatial Scales ◽  
Pilot Scale ◽  
Laboratory Scale ◽  
Test Method ◽  
Conductivity Measurements ◽  
Multiple Spatial Scales ◽  
Ks Values

Abstract This study aims at defining a methodology to evaluate Ks reductions of gravel material constituting constructed wetland (CW) bed matrices. Several schemes and equations for the Lefranc's test were compared by using different gravel sizes and at multiple spatial scales. The falling-head test method was implemented by using two steel permeameters: one impervious (IMP) and one pervious (P) on one side. At laboratory scale, mean K values for a small size gravel (8–15 × 10−2 m) measured by the IMP and the P permeameters were equal to 19,466 m/d and 30,662 m/d, respectively. Mean Ks values for a big size gravel (10–25 × 10−2 m) measured by the IMP and the P permeameters were equal to 12,135 m/d and 20,866 m/d, respectively. Comparison of Ks values obtained by the two permeameters at laboratory scale as well as a sensitivity analysis and a calibration, lead to the modification of the standpipe equation, to evaluate also the temporal variation of the horizontal Ks. In particular, both permeameters allow the evaluation of the Ks decreasing after 4 years-operation and 1–1.5 years' operation of the plants at full scale (filled with the small size gravel) and at pilot scale (filled with the big size gravel), respectively.

A new method for estimating hydraulic conductivity in un-screened concrete-lined large-diameter hand-dug wells

2020 ◽  
Vol 11 ◽  
pp. 100443
Author(s):  
Kehinde Olojoku Ibrahim ◽  
Modreck Gomo ◽  
Saheed Adeyinka Oke ◽  
Mumeen Adebayo Yusuf
Keyword(s):  
Hydraulic Conductivity ◽  
Large Diameter ◽  
New Method ◽  
Dug Wells
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