An ecohydrological model for studying groundwater–vegetation interactions in wetlands

Chui, Ting Fong May; Low, Swee Yang; Liong, Shie‐Yui

doi:10.1016/j.jhydrol.2011.08.039

Cited by 47 publications

(50 citation statements)

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“…Consequently, the impact of transient variations in precipitation and transpiration on the results were ignored in our model. However, precipitation and transpiration dynamics are important processes to the water balance and salt accumulation (Bauer et al, 2006, Bauer-Gottwein et al, 2008Chui et al, 2011), especially to the saltwater/fresh water in- terface and dynamics. The transpiration would be significant during summer, when the presence of the vegetation tends to increase the salinity due to evapotranpiration, and thus may increase the groundwater salinity and decrease the water table.…”

Section: Uncertainty Analysis Of the Methodological Approach On Resultsmentioning

confidence: 99%

“…Recently a series of discussions on the ecohydrological feedback mechanisms (the linkages between the hydrological cycle, biogeochemical cycling and vegetation dynamics) or ecohydrological interactions were reported by many researchers in salt marshes (Ursino et al, 2004;Li et al, 2005;Marani et al, 2005Marani et al, , 2006Wilson and Gardner, 2005;Gardner, 2009;Tossatto et al, 2009;Chui et al, 2011) and in riverine and island systems (Bauer et al, 2006;BauerGottwein et al, 2008). In particular, Marani et al (2006) linked the complex spatial patterns of vegetation to the relevant hydrological and ecological processes in oxygen-limited tidal marsh ecosystems by a model of coupling hydrogeomorphic and ecological dynamics.…”

Section: Y Q Xia and H L Li: A Combined Field And Modeling Study mentioning

confidence: 99%

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A combined field and modeling study of groundwater flow in a tidal marsh

Xia

2012

Hydrol. Earth Syst. Sci.

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Abstract. Bald mud beaches were found among the mangrove marshes in Dongzhaigang National Nature Reserve, Hainan, China. To investigate the possible reasons for this phenomenon, the intertidal zones of a mangrove transect and a bald beach transect with similar topography and tidal actions were selected for comparison study. Along both transects, observed water table variations were significant in the high and low intertidal zones and negligible in the middle intertidal zones. Despite the same tidal actions and above-mentioned similarities, observed groundwater salinity was significantly smaller along the mangrove transect (average 23.0 ppt) than along the bald beach transect (average 28.5 ppt). These observations invite one hypothesis: the hydraulic structure of tidal marsh and freshwater availability may be the main hydrogeological factors critical to mangrove development. Two-dimensional numerical simulations corroborated the speculation and gave results in line with the observed water table. The two transects investigated were found to have a mud-sand two-layered structure: a surface zone of low-permeability mud and an underlying highpermeability zone that outcrops at the high and low tide lines. The freshwater recharge from inland is considerable along the mangrove transect but negligible along the bald beach transect. The high-permeability zone may provide opportunity for the plants in the mangrove marsh to uptake freshwater and oxygen through their roots extending downward into the high-permeability zone, which may help limit the buildup of salt in the root zone caused by evapotranspiration and enhance salt removal, which may further increase the production of marsh grasses and influence their spatial distribution. The bald beach is most probably due to the lack of enough freshwater for generating a brackish beach soil condition essential to mangrove growth. It is also indicated that seawater infiltrated the high-permeability zone through its outcrop near the high intertidal zone, and discharged from the tidal river bank in the vicinity of the low tide line. These processes thereby formed a tide-induced seawater-groundwater circulation, which likely provided considerable contribution to the total submarine groundwater discharge (SGD). Finally, implications and uncertainties behind this study were summarized for future examinations.

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Section: Uncertainty Analysis Of the Methodological Approach On Resultsmentioning

confidence: 99%

Section: Y Q Xia and H L Li: A Combined Field And Modeling Study mentioning

confidence: 99%

A combined field and modeling study of groundwater flow in a tidal marsh

Xia

2012

Hydrol. Earth Syst. Sci.

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“…Considerable research also has focused on the relationships between wetland plants, particularly phreatophytes, and shallow groundwater hydrogeology (e.g. Loheide and Gorelick 2007, Gasca and Ross 2009, Chui et al 2011. However, for other types of GDEs and other hydro-ecological relationships, research is more limited, and there are critical data gaps (Tomlinson 2011).…”

Section: Hydro-ecological Relationshipsmentioning

confidence: 99%

“…Several studies have taken advantage of the close relationships between wetland plants and depth to groundwater in setting groundwater management objectives (e.g. Loheide and Gorelick 2007, Colvin et al 2009, Gasca and Ross 2009, Chui et al 2011, Zhang et al 2011. In general, these studies quantify or model the relationships between wetland hydroperiod and plant community composition or plant physiological response and ultimately show a seasonal range in water table depths over which individual species grow.…”

Section: Hydro-ecological Relationshipsmentioning

confidence: 99%

Hydro-ecology of groundwater-dependent ecosystems: applying basic science to groundwater management

Aldous

Bach

2014

Hydrological Sciences Journal

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Effective policies to protect groundwater-dependent ecosystems require robust methods to determine the environmental flows and levels required to support species and processes. Frameworks to support groundwater management must incorporate the relationships between hydrology and species and ecological processes. These hydro-ecological relationships can be used to develop quantitative, measurable thresholds that are sensitive to changes in groundwater quantity. Here we provide a case study from a group of fens in central Oregon, USA, that are used for cattle watering, but also support numerous sensitive species. We developed quantitative relationships between the position of the water table and wetland indicator plant species and the process of peat development, to propose groundwater withdrawal thresholds. A maximum depth to water table of -0.9 to -34.8 cm for fen plants and -16.6 to -32.2 cm for peat accretion can be tolerated in these wetlands. Defining hydro-ecological relationships as thresholds can support management decisions.Key words groundwater-dependent ecosystem; environmental flows and levels; fen; peat accretion; hydro-ecological relationship; wetland indicator species; groundwater management Hydro-écologie des écosystèmes tributaires des eaux souterraines: application de la science de base à la gestion des eaux souterraines Résumé Les politiques efficaces de protection des écosystèmes tributaires des eaux souterraines ont besoin de méthodes robustes pour déterminer les flux et niveaux environnementaux nécessaires au maintien des espèces et des processus. Les règles de gestion des eaux souterraines doivent inclure les relations entre l'hydrologie, les espèces et les processus écologiques. Ces relations hydro-écologiques peuvent être utilisées pour établir des seuils quantitatifs, mesurables, et sensibles aux changements des masses d'eau souterraine. Nous présentons ici l'étude d'un ensemble de marais du centre de l'Orégon (USA) servant à l'abreuvement du bétail et abritant également de nombreuses espèces sensibles. Nous avons développé des relations quantitatives entre niveau de la nappe, plantes marqueurs des zones humides et développement de la tourbe, afin de définir des seuils d'exploitation des eaux souterraines. La profondeur maximale de la nappe phréatique acceptable dans ces zones humides se situe entre 0,9 et 34,8 cm pour les plantes des marais et entre 16,6 et 32,2 cm pour le développement de la tourbe. La définition de seuils à partir des relations hydro-écologiques peut contribuer aux décisions d'aménagement.Mots clefs écosystème lié aux eaux souterraines ; flux et niveaux environnementaux ; marais ; croissance de la tourbe ; relation hydro-écologique ; espèces indicatrices des zones humides ; gestion des eaux souterraines

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“…Other Everglades modeling efforts focus on improved spatial and temporal resolution (Bolster and Saiers, 2002;Langevin et al, 2005), increased vertical discretization for detailed subsurface studies (Chui et al, 2011), and enhanced parameter estimations such as hydraulic resistance (Bolster and Saiers, 2002;Min et al, 2010). However, there re- (Cook, 2012) and to better understand the impacts of historical and proposed structural operations.…”

Section: Modeling Effortsmentioning

confidence: 99%

Simulating Everglades National Park hydrology and phosphorus transport under existing and future scenarios using numerical modeling

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An ecohydrological model for studying groundwater–vegetation interactions in wetlands

Cited by 47 publications

References 32 publications

A combined field and modeling study of groundwater flow in a tidal marsh

A combined field and modeling study of groundwater flow in a tidal marsh

Hydro-ecology of groundwater-dependent ecosystems: applying basic science to groundwater management

Simulating Everglades National Park hydrology and phosphorus transport under existing and future scenarios using numerical modeling

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