Assessing Canal Seepage And Soil Salinity Using
The Electromagnetic Remote Sensing Technology
Author(s)
F. Cassel S. & D. Zoldoske
Abstract
Canal seepage and soil salinity are two major problems in irrigated areas of
California’s Central Valley, USA. Seepage is very common throughout the vast
network of irrigation canals found in California. Most of these canals are earthen
structures, where seepage contributes to the loss of millions of litres of water
annually. Salinity problems are attributed to saline parent material, clayey soils,
intensive irrigation, shallow water tables, and inadequate drainage that prevents
the leaching of soluble salts. Several irrigation management practices, including
sequential reuse of drainage waters within farm boundaries, are currently being
tested in the region. Such practices are expected to reduce drainage volume,
conserve irrigation water, and contribute to soil reclamation. Canal seepage and
soil salinity can be assessed very accurately using the electromagnetic (EM)
remote sensing technique. When coupled with a GPS and data logging
capabilities, a mobilized EM system can provide automated and geo-referenced
measurements over large areas. The study objectives were to locate seepage
along irrigation canals and assess soil salinity in agricultural fields using the EM
approach. Calibration of the EM data was performed following soil sampling.
Samples were analyzed for electrical conductivity, texture, and moisture. Surface
maps describing spatial distribution of these parameters were generated using
GIS. The study suggested that the location of seepage could be detected rapidly
and cost-effectively with the EM meter. The salinity assessment survey indicated
that soil salinity levels ranged from 1 to 39 dS/m, with high spatial variability
observed in most areas. Elevated salinity values were associated with poor
drainage management. Growers and water agencies can utilize information from
this study to develop water management and conservation strategies.
Keywords: canal seepage, soil salinity, electromagnetic induction, drainage.
Keywords
canal seepage, soil salinity, electromagnetic induction, drainage.
Related Book
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