A salinity module for SWAT to simulate salt ion fate and transport at the watershed scale
<p>Salinity is one of the most common water quality threats in river basins and irrigated regions worldwide. However, no available numerical models simulate all major processes affecting salt ion fate and transport at the watershed scale. This study presents a new salinity module for the SWAT...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2019-07-01
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| Series: | Hydrology and Earth System Sciences |
| Online Access: | https://www.hydrol-earth-syst-sci.net/23/3155/2019/hess-23-3155-2019.pdf |
| Summary: | <p>Salinity is one of the most common water quality threats in river
basins and irrigated regions worldwide. However, no available numerical
models simulate all major processes affecting salt ion fate and transport at the watershed scale. This study presents a new salinity module for the SWAT model that simulates the fate and transport of eight major salt ions
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<span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M7" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msubsup><mi mathvariant="normal">CO</mi><mn mathvariant="normal">3</mn><mrow><mn mathvariant="normal">2</mn><mo>-</mo></mrow></msubsup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="30pt" height="17pt" class="svg-formula" dspmath="mathimg" md5hash="6b5cf86237e0228698f408bc984beff7"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="hess-23-3155-2019-ie00002.svg" width="30pt" height="17pt" src="hess-23-3155-2019-ie00002.png"/></svg:svg></span></span>, <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M8" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msubsup><mi mathvariant="normal">HCO</mi><mn mathvariant="normal">3</mn><mo>-</mo></msubsup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="33pt" height="16pt" class="svg-formula" dspmath="mathimg" md5hash="fdefa3e03a990e4d257c22991005c16e"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="hess-23-3155-2019-ie00003.svg" width="33pt" height="16pt" src="hess-23-3155-2019-ie00003.png"/></svg:svg></span></span>) in a watershed system. The module accounts
for salt transport in surface runoff, soil percolation, lateral flow,
groundwater, and streams, and equilibrium chemistry reactions in soil layers
and the aquifer. The module consists of several new subroutines that are
imbedded within the SWAT modelling code and one input file containing soil
salinity and aquifer salinity data for the watershed. The model is applied
to a 732 km<span class="inline-formula"><sup>2</sup></span> salinity-impaired irrigated region within the Arkansas
River Valley in southeastern Colorado and tested against root zone soil
salinity, groundwater salt ion concentration, groundwater salt loadings to
the river network, and in-stream salt ion concentration. The model can be a
useful tool in simulating baseline salinity transport and investigating
salinity best management practices in watersheds of varying spatial scales.</p> |
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| ISSN: | 1027-5606 1607-7938 |