Hydrologic processes in a southern Ontario wetland

Gehrels, Jim; Mulamoottil, George

doi:10.1007/bf00007787

Cited by 30 publications

(19 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For a variety of reasons, studies of wetland hydrology have been relatively rare (Carter 1986, LaBaugh 1986) until recently. Even now, in most studies it is not possible to estimate error in water-budget terms except by indirect means (e.g., Gehrels and Mulamoottil 1990). Errors, however, are known to be potentially severe (e.g., over 100 percent in ground-water flow calculated by difference ;Winter 1981 ).…”

Section: Introductionmentioning

confidence: 97%

Effect of depth of flooding on summer water budgets for small diked marshes

Kadlec

1993

Wetlands

View full text Add to dashboard Cite

Water budgets for 10 small diked marshes in Manitoba, Canada were constructed for each of the 6 ice-free months for 5 years. Water levels in the marshes were maintained at 3 levels by pumping: 4 marshes at the average level of the surrounding marsh, 3 at +30 cm, and 3 at +60 cm. Water levels were assigned so that surface water-ground water relationships were replicated. At normal levels, precipitation and evapotranspiration (ET) were the major input and output of water, respectively. Local ground water-surface water relationships accounted for 80% of the variability in water budgets. The fraction of the flooded area of the marsh occupied by emergent vegetation was only weakly related to ET, but as emergent vegetation decreased, ET increased.

show abstract

Section: Introductionmentioning

confidence: 97%

Effect of depth of flooding on summer water budgets for small diked marshes

Kadlec

1993

Wetlands

View full text Add to dashboard Cite

show abstract

“…Due to their location at the transitional zone between aquatic and terrestrial ecosystems, wetlands are vital components of the natural environment. Studies have found that wetlands remove nutrients (Hill, 1996;Dørge, 1994;Brüsch and Nilsson, 1993;Devito and Dillon, 1993;Devito et al, 1989), metals (Crites et al, 1997;Sobelewski, 1996;Johnston et al, 1990) and sediments (Johnston et al, 1990;Gehrels and Mulamoottil, 1990) from surface waters. Moreover, wetlands have been shown to influence watershed SO 4 2 dynamics Devito and Hill, 1997;Devito, 1995;O'Brien et al, 1994;Lazerte, 1993;Bayley et al, 1986Bayley et al, , 1992Wieder and Lang, 1988).…”

Section: Introductionmentioning

confidence: 99%

Effect of drought on hydrology and sulphate dynamics in a temperate swamp

Warren

Waddington

Bourbonniere

et al. 2001

Hydrological Processes

View full text Add to dashboard Cite

Abstract:Temperate wetlands are generally net retainers of sulphate (SO 4 2 ). However, recent research indicates that some wetlands may export SO 4 2 during drought conditions. In temperate wetlands, the susceptibility to drought will depend on wetland-stream and groundwater-surface water interactions. Here we present results of summer SO 4 2 dynamics in a confined and unconfined stream within a temperate swamp.At the confined transect, the water table levels dropped greatly ( 55 cm) and groundwater flow patterns reversed in response to summer drought. Although high porewater SO 4 2 concentrations (36Ð4 mg l 1 ) were measured, no downstream export of SO 4 2 was observed. A SO 4 2 mass balance analysis on this stream reach indicated near zero retention. At the unconfined transect, water flowed from the stream to the wetland throughout most of the summer, maintaining relatively high water table levels ( 25 cm). Sulphate porewater concentrations were significantly lower (9Ð2 mg l 1 ) than in the confined transect. Downstream discharge decreased to zero within this reach during extreme drought conditions, resulting in 100% SO 4 2 retention for a three-week period. Upon rewetting stream SO 4 2 levels increased to 161Ð7 mg l 1 resulting in a large net export of SO 4 2 . This study demonstrates that while water table position was an important control on SO 4 2 dynamics within the wetland, the degree of hydrologic connectivity between the wetland and the stream was the main control on episodic SO 4 2 release following summer drought.

show abstract

“…Most recent examples of hydrological models applied to wetland systems are derived from Collection of data to characterize wetland hydrology and for input to a hydrological model of the site. Gehrels and Mulamoottil (1990) Headwater wetland, Ontario; 18 ha.…”

Section: Discussionmentioning

confidence: 99%

The hydrological basis for conservation of floodplain wetlands: implications of work at Narborough Bog, UK

Bradley

1997

Aquatic Conserv: Mar. Freshw. Ecosyst.

View full text Add to dashboard Cite

1. Increasing concern for the environmental consequences of wetland loss has yet to be reflected in a wider application of hydrological techniques for their preservation. This paper looks at the specific example of floodplain wetlands by first considering how local hydrogeomorphological conditions may explain varied wetland occurrence. The effects of variations in individual hydrological fluxes are identified and the ability of standard hydrological monitoring programmes to represent these processes is considered. 2. These concepts are illustrated with reference to work on Narborough Bog, a small floodplain wetland in the UK. The characteristics of the wetland are outlined to illustrate how this determined the design of a monitoring programme investigating wetland hydrology and the practicalities of conservation. Measurements of water‐table height were completed using a network of 30 piezometers located in the wetland and with additional measurements of river stage and meteorological variables. 3. The results of this data collection programme over the period 1991–1993 are described. The value of the data in characterizing the hydrology of the wetland is assessed and the need for sustained monitoring of variations in wetland water storage and flux is emphasized. The implications of the results for future wetland monitoring programmes are identified. 4. Hydrological data collected in this way can be used to develop a wetland mathematical model. This may be achieved by aggregating wetland sedimentological characteristics and by modelling specific periods of precipitation and evapotranspiration to determine the validity of the modelling process. Current shortcomings in the modelling process are discussed; however, wider application of this technique might help direct informed conservation of floodplain wetland landforms through improved understanding of the balance between internal and external water fluxes and their interrelationships. Similarly, models enable evaluation of the impacts of future catchment changes on wetlands. © 1997 John Wiley & Sons, Ltd.

show abstract

Hydrologic processes in a southern Ontario wetland

Cited by 30 publications

References 18 publications

Effect of depth of flooding on summer water budgets for small diked marshes

Effect of depth of flooding on summer water budgets for small diked marshes

Effect of drought on hydrology and sulphate dynamics in a temperate swamp

The hydrological basis for conservation of floodplain wetlands: implications of work at Narborough Bog, UK

Contact Info

Product

Resources

About