Geophysics
; Mixing
; Water management
; Discharge calculation
; Dissolved salt
; Electrical resistivity tomography
; Geophysical methods
; Geophysical techniques
; Irrigation area
; System prototype
; Three dimensional images
; Dilution
; canal
; dilution
; gauge
; geophysical survey
; irrigation system
; plume
; salt
; sampling
; water management
; water resource
英文摘要:
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.
Dept. of Earth Science (DST), Università Degli Studi di Torino, via Valperga Caluso, 35, 10125 Turin, Italy; Dept. of Environment, Land and Infrastructure Engineering (DIATI), Politecnico di Torino, corso Duca degli Abruzzi, 24, 10129 Turin, Italy
Recommended Citation:
Comina C,, Lasagna M,, De Luca D,et al. Geophysical methods to support correct water sampling locations for salt dilution gauging[J]. Hydrology and Earth System Sciences,2014-01-01,18(8)