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Tesi sul tema "Salinisation"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 25 luglio 2025

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1

Montety, Véronique de Blavoux Bernard. "Salinisation d'un aquifère captif côtier en contexte deltaïque cas de la Camargue (delta du Rhône, France) /." Villeurbanne : TEL, 2008. http://tel.archives-ouvertes.fr/docs/00/33/64/17/PDF/These_V_de_Montety2008.pdf.

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2

Stevens, Robert M. "The response of grapevines to transient soil salinisation /." Title page, contents and abstract only, 1995. http://web4.library.adelaide.edu.au/theses/09A/09as848.pdf.

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3

Leitão, João Luís Vieira. "Climate changes: effects of secondary salinisation in freshwater organisms." Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/8332.

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Mestrado em Biologia Aplicada<br>As global climate patterns change, so will freshwater availability. Specially, salinisation of freshwater costal ecosystem is a major point of concern; either by surface flooding or by groundwater intrusions of seawater. This may be potentiated by the decrease of freshwater availability provoked by longer drought periods, evaporation, and increased freshwater extraction (for example for agriculture and other human uses). According, the present work aimed at evaluating how freshwater organisms responded to an increase in salinity. To achieve this main objective
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4

Ahmed, Mohammad Faruque. "Simulating and assessing salinisation in the lower Namoi Valley." Thesis, The University of Sydney, 2001. http://hdl.handle.net/2123/811.

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Dryland salinity is increasing in the upper catchments of central and northern New South Wales, Australia. Consequently, salts may be exported downstream, which could adversely affect cotton irrigated-farming systems. In order to assess the potential threat of salinity a simple salt balance model based on progressively saline water (i.e., ECiw 0.4, 1.5, 4.0 and 9.0 dS/m) was used to simulate the potential impact of salinisation due to the farming systems. The study was carried out in the lower Namoi valley of northern New South Wales, Australia. A comparison has been made of the various non
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5

Ahmed, Mohammad Faruque. "Simulating and assessing salinisation in the lower Namoi Valley." University of Sydney. Land Water and Crop Sciences, 2001. http://hdl.handle.net/2123/811.

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Abstract (sommario):
Dryland salinity is increasing in the upper catchments of central and northern New South Wales, Australia. Consequently, salts may be exported downstream, which could adversely affect cotton irrigated-farming systems. In order to assess the potential threat of salinity a simple salt balance model based on progressively saline water (i.e., ECiw 0.4, 1.5, 4.0 and 9.0 dS/m) was used to simulate the potential impact of salinisation due to the farming systems. The study was carried out in the lower Namoi valley of northern New South Wales, Australia. A comparison has been made of the various non
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6

Clarke, Catherine Bernadette. "Screening for enhanced salt tolerance in Arabidopsis thaliana L. with particular consideration of altered stomatal function." Thesis, Lancaster University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250151.

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7

Ndom, Birane. "Salinisation de l'estuaire de la Casamance : modélisation des processus physiques." Electronic Thesis or Diss., Sorbonne université, 2025. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2025SORUS064.pdf.

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L'estuaire du fleuve Casamance, au sud du Sénégal, est une zone d'intense activité économique mais son fonctionnement hydrodynamique demeure peu documenté. Depuis une période de recherche active dans les années 80, les études sont rares, entraînant un manque de données pour établir une base de référence de l'estuaire et suivre son évolution. Cet estuaire connaît d'importantes fluctuations de salinité : durant la saison sèche (novembre-juin), il s'inverse et sa salinité croit vers l'amont, atteignant 50 psu en saison sèche puis 20 psu en saison humide (juillet-septembre). L'objectif de cette th
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8

Callow, John Nikolaus. "River response to land clearing and landscape salinisation in southwestern Australia." University of Western Australia. School of Earth and Geographical Sciences, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0085.

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[Truncated abstract] Land clearing is known to increase runoff, and in many dryland landscapes is also associated with rising saline watertables, causing increased stream salinity and degrading riparian vegetation. The limited understanding of how river morphology responds to these changes and the potential for vegetation-based strategies to offer river management options under these conditions, has prompted this research. In southwestern Australia the severity of salinity and recent nature of land clearing provides an appropriate setting to investigate river response. A data-based, multidisci
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9

Kirkby, S. D. "Managing dryland salinisation with an integrated expert system/geographic information system /." Title page, abstract and table of contents only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phk593.pdf.

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10

Barbecot, Florent. "Approche géochimique des mécanismes de salinisation des aquifères côtiers : chronologies 14C-226Ra." Paris 11, 1999. http://www.theses.fr/1999PA112319.

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Les aquiferes cotiers, part non negligeable des ressources en eau des bassins sedimentaires en france, ont subi des changements de gradients hydrauliques et de proprietes hydrodynamiques, en reponse aux periodes de decharge/recharge dues aux variations du niveau marin et/ou aux forcages anthropiques. Cette etude a pour objectif principal la comprehension des conditions de recharge et de decharge a l'origine des eaux salees reconnues sur trois sites : les aquiferes du dogger des cotes de la manche (caen) et de l'atlantique (marais poitevin), ainsi que l'aquifere des sables astiens (cap d'agde).
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11

Smith, Michael S. "Development, hydrology and salinisation of the regolth at Bamganie-Meredith, Victoria, Australia." Thesis, Federation University Australia, 2001. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/164964.

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The thesis looks at landscape evolution and salinisation in the Bamganie-Meredith region of Victoria. The importance of reducing waterlogging is stressed if successful land management is to be achieved.<br>Master of Applied Science
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12

Xu, Peng School of Mathematics UNSW. "A computational model for the assessment and prediction of salinisation in irrigated areas." Awarded by:University of New South Wales. School of Mathematics, 2003. http://handle.unsw.edu.au/1959.4/23342.

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This thesis presents the results of a computational study on salt transport and accumulation in crop root zone. The main objective of this study is to examine the impacts of past land use on the environment and to examine the effect of irrigation water on the rising of groundwater level and the subsequent salinity problem in rice growing area under given climatic conditions. A special focus has been such impacts in the Wakool irrigation area, NSW, Australia. To this end, a computational model for the assessment and prediction of salinisation in agricultural areas has been developed. This model
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13

Issa, Sanaa. "Hydrogeologic and 3-D Shallow Groundwater Flow Integrated Study and Salinisation Processes with Some Areas at Western Sydney, New South Wales, Australia." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/20915.

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In South Western Sydney (which encompasses the study area), New South Wales, Australia, salinity is a major emerging urban problem and is primarily related to rising groundwater level. This eight-chapter thesis focuses on the factors influencing salinity and its processes in the Mount Annan, Currans Hills and Narellan Vale areas, and investigates both the present three-dimensional (3-D) groundwater flow pattern and that expected to occur in the area as a result of future urban expansion. The chemical and physical analyses carried out on the soil samples collected from the study areas, and the
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14

Rashnavadi, Mahmoud. "The ecological impacts of secondary salinisation on halo-tolerant fishes in south-western Australia." Thesis, Rashnavadi, Mahmoud (2010) The ecological impacts of secondary salinisation on halo-tolerant fishes in south-western Australia. PhD thesis, Murdoch University, 2010. https://researchrepository.murdoch.edu.au/id/eprint/9644/.

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Abstract (sommario):
Secondary salinisation is a anthropogenic process that is increasingly disrupting the health of freshwater ecosystems in Australia. In a continent where supplying future water resources for a growing population is challenging, secondary salinisation not only makes freshwater ecosystems unsuitable for human use, but may also have substantial negative impacts on aquatic biota. A large body of research in Australia and overseas has found that increasing salinisation is associated with a loss of biodiversity in freshwater ecosystems. However, most of these studies are based on salinity tolerance t
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15

au, L. Sim@murdoch edu, and Lien Sim. "Transitions between ecological regimes in salinising wetlands." Murdoch University, 2005. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20061020.92805.

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Abstract (sommario):
Secondary salinisation has affected large areas of inland southwestern Australia, and in particular, low lying aquatic areas; causing the loss of freshwater submerged macrophyte communities and their replacement by salt-tolerant species. At high salinities, the salt-tolerant macrophyte-dominated ecological regime may be replaced by a regime dominated by benthic microbial communities, further reducing the structural and functional diversity of salinised wetland ecosystems. There is little prospect of restoring salinised systems to a freshwater state, meaning that saline macrophyte dominated wet
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16

Al-Ajmi, Asadullah. "Modelling the development of soil salinity on small farms in Oman growing irrigated crops using saline groundwater." Thesis, University of Reading, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340010.

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17

De, Montety Véronique. "Salinisation d'un aquifère captif côtier en contexte deltaïque - Cas de la Camargue (delta du Rhône, France) -." Phd thesis, Université d'Avignon, 2008. http://tel.archives-ouvertes.fr/tel-00336417.

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Abstract (sommario):
L'objectif de ce travail est de préciser les processus responsables de la salinisation des aquifères côtiers captifs en réponse aux variations du niveau marin (passées, futures) et aux pressions anthropiques. <br />Cette étude a été réalisée sur l'aquifère profond captif de Camargue dans le cadre de l'ORE RESYST. Cet aquifère présente des salinités élevées atteignant celle de la Méditerranée à proximité de la côte. Deux approches ont été menées conjointement : (i) une étude hydrodynamique en régime permanent et transitoire pour préciser le fonctionnement hydrogéologique de l'aquifère (flux, co
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18

Fournier, Isabelle. "Salinisation des écosystèmes lacustres par les sels de voirie : perturbations chimiques et réponses des communautés microbiennes." Doctoral thesis, Université Laval, 2021. http://hdl.handle.net/20.500.11794/68630.

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19

Montety, Véronique de. "Salinisation d'un aquifère captif côtier en contexte deltaïque : cas de la Camargue (delta du Rhône, France)." Avignon, 2008. http://tel.archives-ouvertes.fr/docs/00/33/64/17/PDF/These_V_de_Montety2008.pdf.

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Abstract (sommario):
L'objectif de ce travail est de préciser les processus responsables de la salinisation des aquifères côtiers captifs en réponse aux variations du niveau marin (passées, futures) et aux pressions anthropiques. Cette étude a été réalisée sur l'aquifère profond captif de Camargue dans le cadre de l'ORE RESYST. Cet aquifère présente des salinités élevées atteignant celle de la Méditerranée à proximité de la côte. Deux approches ont été menées conjointement : (i) une étude hydrodynamique en régime permanent et transitoire pour préciser le fonctionnement hydrogéologique de l'aquifère (flux, conditio
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20

Taylor, Sarah Leanne. "The hydrogeochemistry of shallow groundwater in Western Sydney: a study of salinisation processes in shallow groundwater." Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/16115.

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Groundwater salinity is widespread in Western Sydney; however, little is known about the processes which cause it. This thesis explored many features of the shallow groundwater system using a range of hydrogeological, geochemical and statistical techniques. Geostatistical analysis of historical data highlighted that 53.6% of the study region had shallow groundwater with an electrical conductivity exceeding 2,000µS/cm. Salinisation hazard mapping indicated that 0.66% of the region has a high salinisation hazard and 54.2% has a moderate salinisation hazard. The high-temporal-resolution dataset
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21

Morgan, Karina School of Biological Earth &amp Environmental Sciences UNSW. "Evaluation of salinisation processes in the Spicers Creek catchment, central west region of New South Wales, Australia." Awarded by:University of New South Wales. School of Biological, Earth and Environmental Sciences, 2005. http://handle.unsw.edu.au/1959.4/24327.

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Spicers Creek catchment is located approximately 400 km west of Sydney in the Central West region of New South Wales, Australia. Dryland salinity has been recognised as a major environmental issue impacting soil and water resources in the Central West region of NSW for over 70 years. Due to the geological complexity of the catchment and the presence of high salt loads contained within the soils, groundwater and surface waters, the Spicers Creek catchment was identified as a large contributor of salinity to the Macquarie River catchment. Over fifty-two dryland salinity occurrences have been ide
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22

Shanyengana, Shanyengana E. "Groundwater chemistry and supplementary sources of freshwater in Arid environments : groundwater salinisation, solar desalination & fog collection." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52870.

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Thesis (DPhil)--Stellenbosch University, 2002.<br>ENGLISH ABSTRACT: Freshwater is the most fundamental of all life-supporting resources that determine our social, economic and political wellbeing. It is, however, only a small percentage of the world's water resources and is also unevenly distributed. Arid regions make-up about forty percent of the world's land area and have a large proportion of the world population, however, they only have a small fraction of the freshwater compared to other areas. Conventional freshwater sources in arid environments such as surface water in rivers, l
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23

Lorrain-Soligon, Léa. "Conséquences de l’augmentation de la salinité sur la faune des marais littoraux : le cas des amphibiens." Electronic Thesis or Diss., La Rochelle, 2023. http://www.theses.fr/2023LAROS026.

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Les zones humides côtières sont caractérisées par des variations spatiales, temporelles, et liées aux changements globaux, de la salinité. Ces variations de salinité peuvent influencer négativement la biodiversité très riche des zones humides côtières. C’est particulièrement le cas pour les amphibiens, caractérisés par un tégument perméable et de faibles capacités de dispersion. Si la sensibilité des amphibiens à la salinité est bien connue, elle a majoritairement été déterminée dans le cadre du salage des routes, sur des communautés qui sont naïves à l’exposition au sel. Néanmoins, les popula
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24

Taylor, Jonathan Charles. "The application of diatom-based pollution indices in the Vaal catchment / J.C. Taylor." Thesis, North-West University, 2004. http://hdl.handle.net/10394/66.

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South Africa is a semi arid country and the provision of water clean water to a steadily growing population is currently one of the major challenges facing governmental organisations. Water resources in South Africa are subject to many forms of pollution. resulting in eutrophication and salinisation. Hence, there is a need to monitor chemical and organic pollution in South African rivers. Chemical monitoring is expensive and not all the elements of water quality can be monitored and measured in a particular sample. The synergistic effects of water quality determinants cannot be demonstrated if
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25

Saejiew, Atinut. "Evolution des sols de bas fonds au nord-est de la Thailande. Etude des interactions entre sodisation et ferrolyse." Montpellier, ENSA, 2003. http://www.theses.fr/2003ENSA0018.

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L'extension d'une salinité chlorurée sodique en bas de topographie au Nord-est de la Thai1ande est un des problèmes importants pour les agriculteurs et une inquiétude pour les pouvoirs publics. Cette salinisation sodique met en danger l'agriculture et l'environnement, et dégrade les sols. Ces sols ont toujours été peu fertiles, sableux et hydromorphes, ce qui a été expliqué par le processus de ferrolyse. La salinisation et la ferrolyse, semblent les deux pédogenèses importantes pour l'évolution des sols des bas fonds. La première est une voie saline alcaline. La seconde est une voie acide. L'o
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26

Marjoua, Ahmed. "Approche géochimique et modélisation hydrodynamqiue de l'aquifère de la Chaouia côtière (Maroc) : origines de la salinisation des eaux." Paris 6, 1995. http://www.theses.fr/1995PA066387.

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Dans l'ouest du maroc, entre casablanca et azemmour (au sud-ouest de casablanca) s'etend sur 65 km la plaine de la chaouia cotiere. Celle-ci connait une exploitation agricole tres importante. Les eaux souterraines qui representent les seules ressources en eau de la region sont trop mineralisees (jusqu'a 10 g. L#-#1) pour l'alimentation en eau potable et pour l'irrigation. L'objectif de cette etude est donc de rechercher la ou les causes de cette salinite. L'utilisation d'un modele mathematique a differences finies cale sur deux etats hydrodynamiques en regimes permanent et transitoire nous a p
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27

Morgenthal, Theunis Louis. "The assessment of topsoil degradation on rehabilitated coal discard dumps / Theunis Louis Morgenthal." Thesis, North-West University, 2003. http://hdl.handle.net/10394/112.

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This study investigates coal discard cover soil fertility and its potential for degradation, particularly in terms of its salinisation and acidification potential. Seven rehabilitated coal discard dumps in the Witbank, Ermelo and Newcastle regions were used as study areas. All areas were rehabilitated with a cover soil layer, revegetated and annually fertilised with nitrate fertilisers, super phosphate, kraal manure and lime. Performance guideline for pH of 5.5-(6.5 i0.5)-7.5 and electrical conductivity guideline of preferably less than 200 mS.rn-' but not higher than 400 mS.m-' were set based
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28

Nakwafila, Albertina Nuusiku. "Salinisation source(s) and mechanism(s) in shallow alluvial aquifers along the Buffels River, Northern Cape Province, South Africa." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96826.

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Thesis (MSc)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: Several areas in Namaqualand are affected by elevated levels of salinity; including the shallow alluvial aquifers along the Buffels River catchment. The chemistry of rainwater that recharges these aquifers has low salt-loads, but the groundwater system is very saline. The shallow alluvial aquifers are an important source of water for several communal areas along the river both for domestic and agricultural purposes. Groundwater is also used for the copper and diamond mining activities along the river. Prior to this study, the so
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29

Lavanchy, Pierre-François. "Transferts couplés eau-solutés en conditions naturelles : application aux problèmes de salinisation des sols de la plaine du Rhône valaisanne /." Lausanne : EPFL, 1992. http://library.epfl.ch/theses/?display=detail&nr=969.

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30

Silva, José Leôncio de Almeida. "Desempenho de equações de lavagem para recuperação de solo salinizado por excesso de fertilizantes em ambiente protegido." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/11/11152/tde-15082016-111809/.

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Em regiões nas quais a irrigação é intensiva, visando o aumento da produção de culturas, a fertirrigação é uma prática muito utilizada como uma alternativa para a adubação, proporcionando o menor grau de risco possível. Entretanto, a aplicação excessiva de adubos, via fertirrigação, pode elevar o risco de salinização dos solos, especialmente pela aplicação indiscriminada de fertilizantes. Nem sempre as chuvas que ocorrem em campo aberto são suficientes para lavar os sais do solo. O volume de água necessário para a lavagem de recuperação de um perfil de solo é calculado em função da salinidade
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31

Robson, Belinda. "The effect of salinisation on the structure and function of the macroinvertebrate communities of streams in the Wandoo Forest, Western Australia." Thesis, Robson, Belinda (1990) The effect of salinisation on the structure and function of the macroinvertebrate communities of streams in the Wandoo Forest, Western Australia. Honours thesis, Murdoch University, 1990. https://researchrepository.murdoch.edu.au/id/eprint/41510/.

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Two sites on each of four intermittent streams of differing salinities flowing through wandoo woodland were sampled to examine the effects of salinisation on the structure and function of the macroinvertebrate communities. A range of physicochemical parameters were measured and leaf packs were used to measure the rates and types of leaf decomposition in the streams…
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32

Le, Trong Dieu Hien [Verfasser], Ralf [Akademischer Betreuer] Schäfer, Mira [Akademischer Betreuer] Kattwinkel, Ralf [Gutachter] Schäfer, and Elisabeth [Gutachter] Berger. "Pesticides and salinisation, two stressors of freshwater ecosystems / Trong Dieu Hien Le ; Gutachter: Ralf Schäfer, Elisabeth Berger ; Ralf Schäfer, Mira Kattwinkel." Landau : Universität Koblenz-Landau, Campus Landau, 2020. http://d-nb.info/1223455041/34.

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33

Condom, Nicolas. "Analyse et modelisation couplee des processus hydro-geochimiques de la salinisation des sols : application aux sols irrigues de l'office du niger (mali)." Montpellier, ENSA, 2000. http://www.theses.fr/2000ENSA0005.

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Abstract (sommario):
Cette etude a pour objectif l'analyse des mecanismes de salinisation, alcalinisation et sodisation des sols irrigues. A l'echelle du profil de sol, elle vise a identifier les phenomenes hydro-geochimiques et leurs interactions et a comprendre leur evolution dans le cas des sols rizicoles de l'office du niger (mali). La demarche s'appuie sur des experimentations en milieu controle, des suivis de terrain et sur la modelisation numerique des processus. Un modele numerique mecaniste integrant les processus hydrogeochimiques selon des lois cinetiques a ete developpe en couplant un modele determinis
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34

Abbes, Kaïs. "Analyse de la relation agriculture-environnement : une approche bio-économique : cas de la salinisation des sols et de la pollution par les nitrates au nord tunisien." Montpellier 1, 2005. http://www.theses.fr/2005MON10002.

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Pour aborder la complexité de la relation agriculture-environnement, un modèle économique est couplé à un modèle biophysique. Le modèle bio-économique ainsi conçu pour une région semi-aride nous a permis de tirer des riches enseignements. Sur le plan empirique, la simulation des formules tarifaires binômes de l'eau a mis en exergue les conflits d'intérêts entre des agriculteurs cherchant à maximiser leurs revenus et un gestionnaire de la ressource en eau soucieux d'améliorer la couverture de ses charges. Alors que la simulation des politiques environnementales a mis en évidence que aucun effor
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35

Belaid, Nebil. "Evaluation des impacts de l'irrigation par les eaux usées traitées sur les plantes et les sols du périmètre irrigué d'El Hajeb-Sfax : salinisation, accumulation et phytoabsorption des éléments métalliques." Limoges, 2010. https://aurore.unilim.fr/theses/nxfile/default/a8a097b5-d757-4af1-a2bb-253eaf48bf21/blobholder:0/2010LIMO4003.pdf.

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Dans le cadre de la stratégie tunisienne d’optimisation de la réutilisation des eaux usées traitées (EUT), plusieurs périmètres agricoles irrigués ont été créés. Le risque de l’irrigation des cultures par les EUT dépend d'une part, de la qualité des EUT et d'autre part, de la nature de la couverture pédologique et des pratiques culturales (type et rotation des cultures). L’objectif de ce travail est d’évaluer l'impact de cette irrigation sur les sols et les plantes dans le périmètre d'El Hajeb, réutilisant les EUT de la STEP de Sfax depuis 1989. Deux types de sols bien représentés dans le péri
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36

Timms, Wendy Amanda Civil &amp Environmental Engineering Faculty of Engineering UNSW. "The importance of aquitard windows in the development of alluvial groundwater systems : Lower Murrumbidgee, Australia." Awarded by:University of New South Wales. School of Civil and Environmental Engineering, 2001. http://handle.unsw.edu.au/1959.4/18671.

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Variable groundwater quality in complex aquifer-aquitard systems presents a challenge for sustainable groundwater development. In the Lower Murrumbidgee alluvial fan of the Murray-Darling Basin in semi arid inland Australia, shallow groundwater is saline (12000 &micro S/cm) and locally contaminated by nitrate. Deep fresh aquifers (150 &micro S/cm), developed as an irrigation water supply, were thought to be protected from downwards leakage by laterally extensive aquitards. However, hydrochemical sampling, augmented by historic data, revealed that aquifer salinisation (400 to 4000 &micro S/cm)
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37

Vincent, Aude. "Etude hydrologique et hydrogéologique du bassin sédimentaire côtier de Kaluvelli-Pondichéry, Tamil Nadu, Inde." Paris 6, 2007. http://www.theses.fr/2007PA066520.

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Ce bassin HELP-UNESCO situé en zone semi-aride à régime de mousson est représentatif des zones densément peuplées où des problèmes de réduction de la quantité et de forte minéralisation des eaux souterraines sont identifiés. Ses aquifères sont fortement sollicités pour l'irrigation depuis 1970 aux dépens des systèmes d'irrigation traditionnels. Après avoir validé et complété une base de données géoréférencées notre travail a permis de : caractériser le fonctionnement hydrologique, quantifier le terme de recharge vers les aquifères, quantifier le système aquifère multicouche, retracer son évolu
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38

Taukulis, Fiona E. "Diatom communities in lakes and streams of varying salinity from south-west Western Australia : distribution and predictability." Thesis, Curtin University, 2007. http://hdl.handle.net/20.500.11937/2164.

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Abstract (sommario):
The distribution pattern of diatoms from lakes and streams of varying salinity in the south-west of Western Australia was investigated. A total of 95 water bodies were sampled and separated into freshwater (<3 ppt), hyposaline (3-20 ppt), mesosaline (20-50 ppt) and hypersaline (>50 ppt). The south-west and specifically the inland wheatbelt region has been severely influenced by secondary salinisation, due to clearing of native vegetation for agriculture. There has been little research on diatom communities from salt-affected systems, with this data providing the basis for the development of an
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39

Muqbel, Mohammed Saleh. "Étude hydrochimique et isotopique de trois aquifères alluviaux (Oueds Tuban, Bana, Hadramoute) de la République démocratique populaire du Yémen (R. D. P. Y)." Paris 11, 1986. http://www.theses.fr/1986PA112072.

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Abstract (sommario):
Dans ce travail, on expose les résultats concernant trois aquifères alluviaux (Tuban, Bana et Hadramoute) en République Démocratique Populaire du Yémen, sous climat aride et semi-aride. Cette étude a pour objet l'investigation des eaux des nappes libres, à partir des données hydrochimiques et isotopiques. L'interprétation de ces données apporte des éléments de réponses relatifs sur -L'origine et l'évolution de la salinité des eaux souterraines dans les nappes considérées. La minéralisation est essentiellement due à la dissolution. -Les conditions de recharge des eaux souterraines et l'effet év
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40

Dhaoui, Ridha. "Contribution à la définition des évolutions des systèmes géomorphologiques et des risques érosifs dans le bassin de Kairouan (Tunisie)." Rennes 2, 2009. http://www.theses.fr/2009REN20037.

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L’organisation géomorphologique actuelle du Bassin de Kairouan (Tunisie centrale) commande le fonctionnement de nombreux processus naturels actuels comme c’est le cas du processus de la salinisation et le ruissellement diffus et concentré. Mais ces processus ne dépendent pas seulement de la géomorphologie : le climat et les activités humaines interviennent aussi. Ce travail essaye tout d’abord de comprendre les processus actuels du fonctionnement géomorphogénique du Bassin de Kairouan, puis de mettre en évidence l’impact de la structuration géomorphologique du fonctionnement des milieux et du
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41

Mendes, João Paulo Gonçalves da Silva. "A sementeira direta e as culturas de cobertura no controlo da salinidade do solo em culturas regadas." Doctoral thesis, Universidade de Évora, 2015. http://hdl.handle.net/10174/16427.

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Abstract (sommario):
Este estudo visou avaliar o contributo da sementeira direta (SD) e de culturas de cobertura (CC) durante o Inverno na atenuação do risco de salinização/sodização do solo, em solos com má drenagem interna, perspetivando o aumento de regadio proporcionado pelo Alqueva. O aumento da estabilidade estrutural do solo e a redução da evaporação direta que a SD e as CC normalmente atribuídas a este sistema proporcionam, poderão contribuir para uma menor acumulação de sais no solo durante o verão e uma maior lavagem durante o inverno. Para testar a hipótese de trabalho instalou-se um ensaio com dois sis
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42

Taukulis, Fiona E. "Diatom communities in lakes and streams of varying salinity from south-west Western Australia : distribution and predictability." Curtin University of Technology, Dept. of Environmental Biology, 2007. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=17715.

Testo completo
Abstract (sommario):
The distribution pattern of diatoms from lakes and streams of varying salinity in the south-west of Western Australia was investigated. A total of 95 water bodies were sampled and separated into freshwater (<3 ppt), hyposaline (3-20 ppt), mesosaline (20-50 ppt) and hypersaline (>50 ppt). The south-west and specifically the inland wheatbelt region has been severely influenced by secondary salinisation, due to clearing of native vegetation for agriculture. There has been little research on diatom communities from salt-affected systems, with this data providing the basis for the development of an
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43

Wang, Qing. "Impacts of climate, topography, and weathering profile on vadose zone hydrology and coastal pine plantation management : a multi-scale investigation, Southeast Queensland, Australia." Thesis, Queensland University of Technology, 2008. https://eprints.qut.edu.au/20657/1/Wang_Qing_Thesis.pdf.

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Abstract (sommario):
Exotic pine plantations are a major landuse within the coastal lowlands of southeast Queensland, extending from close to the shoreline to the hinterland ranges. These plantations are within a sub-tropical climatic zone, and in most years, the summers are appreciably wetter than the winters. This terrain, in general, has been highly weathered and the soils are poor in nutrients. Environmental factors such as the climate, topography and weathering profile (including soil) are found to be important controls on vadose zone hydrology, which, in turn, has a great impact on tree growth and consequent
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44

Wang, Qing. "Impacts of climate, topography, and weathering profile on vadose zone hydrology and coastal pine plantation management : a multi-scale investigation, Southeast Queensland, Australia." Queensland University of Technology, 2008. http://eprints.qut.edu.au/20657/.

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Abstract (sommario):
Exotic pine plantations are a major landuse within the coastal lowlands of southeast Queensland, extending from close to the shoreline to the hinterland ranges. These plantations are within a sub-tropical climatic zone, and in most years, the summers are appreciably wetter than the winters. This terrain, in general, has been highly weathered and the soils are poor in nutrients. Environmental factors such as the climate, topography and weathering profile (including soil) are found to be important controls on vadose zone hydrology, which, in turn, has a great impact on tree growth and consequent
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45

Armandine, Les Landes Antoine. "Impact des variations climatiques sur les ressources hydrogéologiques." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S101/document.

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Les eaux souterraines représentent environ 98% des eaux douces potentiellement disponibles pour l'homme sur notre planète, en faisant donc une ressource fondamentale de nos sociétés. Du fait du changement climatique et du fort lien existant entre le climat et le cycle de l'eau, une préoccupation légitime est née concernant l'impact potentiel de ce changement climatique sur les ressources en eau. À ce jour, des évidences de plus en plus nombreuses appuient le fait que les modifications des conditions climatiques se répercutent sur le cycle hydrologique. L'identification de la sensibilité des ea
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46

Piscart, Christophe. "Rôle de la salinité dans la dynamique et la régulation de la biodiversité des communautés de macroinvertébrés dulçaquicoles." Metz, 2004. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/2004/Piscart.Christophe.SMZ0427.pdf.

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Abstract (sommario):
Un intérêt croissant est porté aux conséquences des modifications du climat et de la température sur les milieux aquatiques continentaux. Une augmentation de la salinité des eaux est envisagée dans un contexte de changements globaux, due en particulier à l'augmentation de l'évaporation, la remonté du niveau marin et des aquifères souterraines, les changements d'occupation des sols et les processus d'érosion des bassins versants. Malgré cette perspective, le rôle de la salinité dans les écosystèmes d'eaux douces est mal connu, en particulier au niveau d'écosystèmes situés en climat tempéré. L'o
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47

Ibrahim, Maimouna. "Impacts des changements d'usage des sols sur les ressources en eau souterraine au Sahel nigérien." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20046/document.

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Abstract (sommario):
La forte croissance démographique (~3%.an-1) observée au cours des dernières décennies en Afrique subsaharienne a engendré la conversion de grandes étendues de savane arborée en cultures pluviales ou irriguées et la diminution de la durée des jachères. Afin de déterminer l'impact de tels changements d'usage du sol sur la recharge des nappes phréatiques, la zone non saturée a été investiguée pendant trois ans (2009-2011) pour deux régions du Niger (sud-ouest et sud-est) aux conditions climatiques et géomorphologiques différentes.Une approche expérimentale in-situ a tout d'abord permis de caract
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48

Mashimbye, Zama Eric. "Remote sensing-based identification and mapping of salinised irrigated land between Upington and Keimoes along the lower Orange River, South Africa." Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1647.

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49

Etienne, Lucile. "Accentuation récente de la vulnérabilité liée au recul du trait de côte et à l'extension des sebkhas dans l'archipel de Kerkennah (Tunisie)." Paris 7, 2014. http://www.theses.fr/2014PA070024.

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Abstract (sommario):
L'archipel de Kerkennah, situé dans le Golfe de Gabès en Tunisie, est composé d'une dizaine de petites îles dont le relief est très plat et la lithologie meuble et fragile. Les espaces les plus bas sont occupés par des sebkhas, espaces salés et stériles. L'évolution du climat et l'élévation relative du niveau de la mer ainsi que les évolutions importantes des modes de vie et de production locaux ont conduit à des changements dans l'occupation du sol. Cette thèse vise à comprendre l'évolution de la vulnérabilité liée à la mobilité du trait de côte et à la salinisation des sols depuis les années
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50

Khaska, Mahmoud. "Vulnérabilité des ressources en eau souterraine : origines de la salinité en domaine karstique côtier et de la contamination après-mine en métaux lourds. Approche par multitracage géochimique." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4381.

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Abstract (sommario):
La premier thématique a pour objectifs :1) de tracer l’origine de la salinité des eaux des aquifères karstiques en milieu côtier méditerranéen,2) de quantifier les proportions de mélange entre les eaux salées et les eaux karstiques,3) de discriminer les traceurs géochimiques pour identifier et modéliser les processus de salinisation d’aquifères karstiques côtiers. La seconde thématique a pour objectifs:1) d’établir les [As] d’origine naturelle des eaux de surface et des eaux souterraines, 2) de quantifier le niveau de contamination en arsenic de ces eaux et sa variabilité spatio-temporelle 3)
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