Geophysical methods to support correct water sampling locations for salt dilution gauging
To improve water management design, particularly in irrigation areas, it is important to evaluate the baseline state of the water resources, including canal discharge. Salt dilution gauging is a traditional and well-documented technique in this respect. The complete mixing of salt used for dilution...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2014-08-01
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| Series: | Hydrology and Earth System Sciences |
| Online Access: | http://www.hydrol-earth-syst-sci.net/18/3195/2014/hess-18-3195-2014.pdf |
| Summary: | To improve water management design, particularly in irrigation areas, it is
important to evaluate the baseline state of the water resources, including
canal discharge. Salt dilution gauging is a traditional and well-documented
technique in this respect. The complete mixing of salt used for dilution
gauging is required; this condition is difficult to test or verify and, if
not fulfilled, is the largest source of uncertainty in the discharge
calculation. In this paper, a geophysical technique (FERT, fast electrical
resistivity tomography) is proposed for imaging the distribution of the salt
plume used for dilution gauging at every point along a sampling
cross section. With this imaging, complete mixing can be verified. If the
mixing is not complete, the image created by FERT can also provide a
possible guidance for selecting water-sampling locations in the sampling
cross section. A water multi-sampling system prototype aimed to potentially
take into account concentration variability is also proposed and tested.
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The results reported in the paper show that FERT provides a
three-dimensional image of the dissolved salt plume and that this can
potentially help in the selection of water sampling points. |
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| ISSN: | 1027-5606 1607-7938 |