Salinity Assessment for Salted Soil Considering Both Dissolved and Precipitated Salts
| Autor: | Zi Ying, Myriam Duc, Nadia Benahmed, Yu-Jun Cui |
|---|---|
| Přispěvatelé: | Laboratoire Navier (NAVIER UMR 8205), École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel, Risques, Ecosystèmes, Vulnérabilité, Environnement, Résilience (RECOVER), Aix Marseille Université (AMU)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Sols, Roches et Ouvrages Géotechniques (GERS-SRO), Université Gustave Eiffel, China Scholarship Council (CSC)Ecole des Ponts ParisTech (ENPC)INRAE, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) |
| Rok vydání: | 2020 |
| Předmět: |
SALINITE
Soil salinity IMPACT Compaction 0211 other engineering and technologies Salt (chemistry) 02 engineering and technology Suction SOIL SALINITY complex mixtures Stiffness Pore water pressure DISSOLVED SALT Electrical resistivity and conductivity SALINITY ASSESSMENT WATER SALINITY Geotechnical engineering Microstructure Water content 021101 geological & geomatics engineering chemistry.chemical_classification ETUDE D&apos 021110 strategic defence & security studies PRECIPITATED SALT CONDUCTIVITE 15. Life on land Geotechnical Engineering and Engineering Geology 6. Clean water ELECTRICAL CONDUCTIVITY Salinity [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering chemistry EAU SEL Environmental chemistry Soil water PROPRIETE DES SOLS ZABR Inductively coupled plasma Silts SOL DE FONDATION |
| Zdroj: | Geotechnical Testing Journal Geotechnical Testing Journal, 2021, pp.1-10. ⟨10.1520/GTJ20190301⟩ Geotechnical Testing Journal, ASTM International, 2020, 9 p. ⟨10.1520/GTJ20190301⟩ |
| ISSN: | 0149-6115 |
| DOI: | 10.1520/gtj20190301 |
| Popis: | In practice, the soils in shallow depth are usually subjected to the effect of wetting-drying cycles, leading to water content variations. As water content decreases, the dissolved salt starts to precipitate or crystallize. In reality, only dissolved salt has an effect on the thermo-hydro-mechanical behavior of soils, whereas the precipitated salt can be regarded as soil solid. However, the existing description of salted soil compositions and salinity assessment do not take the salt state into account, limiting its application to salted soils that undergo significant water content changes. In this study, the description of salted soil compositions was revised considering both dissolved and precipitated salts. Then, the relationship between dissolved water salinity (the mass ratio of dissolved salt to salty water) and dissolved soil salinity (the mass ratio of dissolved salt to dry solid) was established. Considering the complex chemical compositions of soil pore water, the relationship between the electrical conductivity (EC) and water salinity (r) of mixed salt solution was plotted to transform the measured EC to water salinity. Salt quantity was determined by centrifuge and the EC-r relationship of the mixed salt solution, allowing water and soil salinities to be determined. Besides, the ion compositions and concentrations of soil pore water and site water were estimated by Inductively Coupled Plasma/Atomic Emission Spectroscopy. The similar results obtained for soil pore water and site water proved that the adopted salinity assessment method was relevant. This was also confirmed by the results obtained on salt-amended soils with the measured salinities agreeing well with the target ones. Based on the obtained results, three approaches were proposed to determine the dissolved water salinity of salt-amended soils with decreasing salty water content. This allowed the dissolved soil salinity to be obtained according to the relationship between dissolved water salinity and dissolved soil salinity. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|