Origin and dynamics of groundwater salinity in the alluvial plains of western Delhi and adjacent territories of Haryana State, India
Identifieur interne : 000091 ( Istex/Checkpoint ); précédent : 000090; suivant : 000092Origin and dynamics of groundwater salinity in the alluvial plains of western Delhi and adjacent territories of Haryana State, India
Auteurs : Gunnar Lorenzen [Allemagne] ; Christoph Sprenger [Allemagne] ; Paul Baudron [France] ; Dinesh Gupta [Inde] ; Asaf Pekdeger [Allemagne]Source :
- Hydrological Processes [ 0885-6087 ] ; 2012-07-15.
Abstract
Groundwater salinity is a widespread problem and a challenge to water resources management. It is an increasing concern in the alluvial plains of Delhi and neighbouring Haryana state as well as a risk for agricultural production water supply and sustainable development. This study aims to identify potential sources of dissolved salts and the driving mechanisms of salinity ingress in the shallow aquifer. It combines a comprehensive review of environmental conditions and the analysis of groundwater samples from 25 sampling points. Major ions are analysed to describe the composition and distribution of saline groundwater and dissolution/precipitation dynamics. Density stratification and local upconing of saline waters were identified by multilevel monitoring and temperature logging. Bromide–chloride ratios hold information on the formation of saline waters, and nitrate is used as an indicator for anthropogenic influences. In addition, stable isotope analysis helps to identify evaporation and to better understand recharge processes and mixing dynamics in the study region. The results lead to the conclusion that surface water and groundwater influx into the poorly drained semiarid basin naturally results in the accumulation of salts in soil, sediments and groundwater. Human‐induced changes of environmental conditions, especially the implementation of traditional canal and modern groundwater irrigation, have augmented evapotranspiration and led to waterlogging in large areas. In addition, water‐level fluctuations and perturbation of the natural hydraulic equilibrium favour the mobilisation of salts from salt stores in the unsaturated zone and deeper aquifer sections. The holistic approach of this study demonstrates the importance of various salinity mechanisms and provides new insights into the interference of natural and anthropogenic influences. Copyright © 2011 John Wiley & Sons, Ltd.
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DOI: 10.1002/hyp.8311
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Process.</title><idno type="ISSN">0885-6087</idno><idno type="eISSN">1099-1085</idno><imprint><publisher>John Wiley & Sons, Ltd</publisher><pubPlace>Chichester, UK</pubPlace><date type="published" when="2012-07-15">2012-07-15</date><biblScope unit="volume">26</biblScope><biblScope unit="issue">15</biblScope><biblScope unit="page" from="2333">2333</biblScope><biblScope unit="page" to="2345">2345</biblScope></imprint><idno type="ISSN">0885-6087</idno></series><idno type="istex">E4296316560821CF7ACF3842D3DA7F85F3743C21</idno><idno type="DOI">10.1002/hyp.8311</idno><idno type="ArticleID">HYP8311</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0885-6087</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Groundwater salinity is a widespread problem and a challenge to water resources management. It is an increasing concern in the alluvial plains of Delhi and neighbouring Haryana state as well as a risk for agricultural production water supply and sustainable development. This study aims to identify potential sources of dissolved salts and the driving mechanisms of salinity ingress in the shallow aquifer. It combines a comprehensive review of environmental conditions and the analysis of groundwater samples from 25 sampling points. Major ions are analysed to describe the composition and distribution of saline groundwater and dissolution/precipitation dynamics. Density stratification and local upconing of saline waters were identified by multilevel monitoring and temperature logging. Bromide–chloride ratios hold information on the formation of saline waters, and nitrate is used as an indicator for anthropogenic influences. In addition, stable isotope analysis helps to identify evaporation and to better understand recharge processes and mixing dynamics in the study region. The results lead to the conclusion that surface water and groundwater influx into the poorly drained semiarid basin naturally results in the accumulation of salts in soil, sediments and groundwater. Human‐induced changes of environmental conditions, especially the implementation of traditional canal and modern groundwater irrigation, have augmented evapotranspiration and led to waterlogging in large areas. In addition, water‐level fluctuations and perturbation of the natural hydraulic equilibrium favour the mobilisation of salts from salt stores in the unsaturated zone and deeper aquifer sections. The holistic approach of this study demonstrates the importance of various salinity mechanisms and provides new insights into the interference of natural and anthropogenic influences. Copyright © 2011 John Wiley & Sons, Ltd.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>France</li><li>Inde</li></country><region><li>Berlin</li></region><settlement><li>Berlin</li></settlement></list><tree><country name="Allemagne"><region name="Berlin"><name sortKey="Lorenzen, Gunnar" sort="Lorenzen, Gunnar" uniqKey="Lorenzen G" first="Gunnar" last="Lorenzen">Gunnar Lorenzen</name></region><name sortKey="Lorenzen, Gunnar" sort="Lorenzen, Gunnar" uniqKey="Lorenzen G" first="Gunnar" last="Lorenzen">Gunnar Lorenzen</name><name sortKey="Pekdeger, Asaf" sort="Pekdeger, Asaf" uniqKey="Pekdeger A" first="Asaf" last="Pekdeger">Asaf Pekdeger</name><name sortKey="Sprenger, Christoph" sort="Sprenger, Christoph" uniqKey="Sprenger C" first="Christoph" last="Sprenger">Christoph Sprenger</name></country><country name="France"><noRegion><name sortKey="Baudron, Paul" sort="Baudron, Paul" uniqKey="Baudron P" first="Paul" last="Baudron">Paul Baudron</name></noRegion></country><country name="Inde"><noRegion><name sortKey="Gupta, Dinesh" sort="Gupta, Dinesh" uniqKey="Gupta D" first="Dinesh" last="Gupta">Dinesh Gupta</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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